JP2012185601A - Distribution system, server device, terminal device, service method, terminal method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a distribution system, a server device, a terminal device, a service method, a terminal method and a program realizing them with a computer capable of reducing a load of a server and improving transmission efficiency of data when a plurality of terminals acquire the same data through a network.SOLUTION: A server device 201 adds terminal identification names of terminal devices of message's transmission sources and a designated data identification name to a storage part 503 corresponding to request messages from a plurality of terminal devices. An acquisition part 504 acquires a data identification name stored in the storage part 503 without duplication, divides data into segments by the acquired data identification names and circularly transmits the segments to the terminal devices of transmission sources from a segment transmission part 505. When the terminal devices receiving the segments have acquired all the segments, they transmit a completion message to the server device 201 to finish the reception.

Description

  The present invention provides a distribution system, a server device, a terminal device, a service method, and a terminal that can reduce the load on the server and improve the data transmission efficiency when a plurality of terminals acquire the same data via a network. The present invention relates to a method and a program for realizing these methods on a computer.

  Conventionally, when acquiring data via a network, a data processing system suitable for preventing as much access as possible from being concentrated on one device has been proposed (see Patent Document 1).

JP 2006-209343 A

  On the other hand, there is a demand for a system that reduces the burden on the server and increases the data transmission efficiency when a plurality of terminals acquire the same data via a network.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and a distribution system that can reduce the load on a server and improve data transmission efficiency when a plurality of terminals acquire the same data via a network. An object of the present invention is to provide a server device, a terminal device, a service method, a terminal method, and a program that implements these on a computer.

In order to achieve the above object, a distribution system according to a first aspect of the present invention includes a server device and a plurality of terminal devices connected to be able to communicate with the server device.
For example, the server device is a device that updates information, provides new content, and the like, and the terminal device corresponds to, for example, a game device. By using the system, for example, the server load due to concentration of access to the server apparatus immediately after provision of new content can be reduced.

First, the server device includes a storage unit, a request reception unit, an addition unit, an acquisition unit, a fragment transmission unit, a completion reception unit, and a deletion unit.
Here, the storage unit stores connection information in which a terminal identification name and a data identification name are designated, and the request reception unit receives a request message for designating a data identification name from any of a plurality of terminal devices. Upon receipt of the request message, the adding unit adds connection information that specifies the terminal identification name of the terminal device that is the transmission source of the request message and the data identification name specified in the request message to the storage unit. .

That is, the storage unit stores connection information in which a terminal identification name specified by an IP address or the like and a data identification name specifying a type of game content or the like are designated.
When a request message in which a data identification name of a game content or the like that the terminal device desires to download is transmitted from one of the plurality of terminal devices, the adding unit specifies data specified by the transmission source terminal device Connection information including the identification name and the terminal identification name of the transmission source is added and stored in the storage unit.

   While the connection information is stored in the storage unit, the acquisition unit acquires the data identification name specified for each of the stored connection information without duplication, and for each data identification name obtained without duplication, data Fragments obtained by dividing the data associated with the identification names are acquired in a predetermined cyclic order, and when the fragments are acquired, the fragment transmission unit identifies the fragments in the fragments and the fragment source data of the fragments. A fragment message designating the position where the fragment was placed is transmitted to each terminal apparatus having the terminal identification name designated in the connection information that caused the fragment to be acquired.

  That is, the acquisition unit does not acquire the data identification name already stored in the storage unit, and acquires a data identification name that does not exist in the storage unit. For example, the terminal device X designates the data identification name A, the terminal device Y designates the data identification name A, the terminal device Z designates the data identification name A, and the terminal device W designates the data identification name B. In the case of designating, the obtaining unit obtains only two each of A and B without obtaining duplicate data identification names.

  The data associated with the data identification name, for example A, is divided into a plurality of fragments a1 to a6. These fragments are acquired in the acquisition unit in a form that circulates in a predetermined order, for example, a1 → a2 → a3 → a4 → a5 → a6 → a1 → a2.

  Furthermore, information on the position where the fragment is arranged in the data is given to each fragment. For example, when data of an arbitrary data identification name is divided into six fragments, the position information of 3/6 is assigned to the fragment arranged at the third position. The fragment content information and the position information are transmitted together as a fragment message from the fragment transmitting unit to the data requesting terminal.

  The completion receiving unit receives a completion message designating a data identification name from any of the plurality of terminal devices, and when the deletion unit receives the completion message, the terminal identification name of the terminal device that is the transmission source of the completion message, The connection information specifying the data identification name specified in the request message is deleted from the storage unit.

  That is, in the data request source terminal device, when all fragments corresponding to the requested data identification name are acquired, a completion message is transmitted, and when the server device receives the transmission message, the deletion unit, the storage unit The connection information including the terminal identification name and the data identification name stored in is deleted.

On the other hand, each of the plurality of terminal devices includes a request transmission unit, a fragment reception unit, a storage unit, a restoration unit, and a completion transmission unit.
Here, the request transmission unit transmits a request message designating the data identification name of the desired data to the server device, and the fragment reception unit receives the fragment message from the server device until the desired data is restored. The accumulating unit accumulates the fragment specified in the received fragment message in association with the position where the fragment is arranged in the desired data.

That is, each terminal device transmits, for example, a request message specifying a data identification name that specifies content requested by the game player.
The requested data identifier data is received and stored as a fragment message at the fragment receiver in the form of data divided into a plurality of fragments.

  Then, when all the fragments obtained by dividing the desired data are accumulated, the restoration unit obtains a desired value from each of the accumulated fragments and a position accumulated in association with each of the accumulated fragments. When the desired data is restored, the completion transmitting unit transmits a completion message designating the data identification name of the desired data to the server device.

That is, when all the pieces of requested data are accumulated in the requesting terminal device, the data is restored based on the fragment position information.
When the data is restored, a completion message is transmitted from the completion transmission unit to the server device.

  According to the present invention, data corresponding to data identification names requested from a plurality of terminal devices is divided into a plurality of fragments, cyclically transmitted in a predetermined order, and restored on the terminal device side, thereby enabling communication. It is possible to provide a distribution system that can reduce the load on the server device.

  A server device according to another aspect of the present invention is a server device in the distribution system.

That is, the server device includes a storage unit, a request reception unit, an addition unit, an acquisition unit, a fragment transmission unit, a completion reception unit, and a deletion unit.
Here, the storage unit stores connection information in which a terminal identification name and a data identification name are designated, and the request reception unit receives a request message for designating a data identification name from any of a plurality of terminal devices. Upon receiving the request message, the adding unit adds connection information specifying the terminal identification name of the terminal device that is the transmission source of the request message and the data identification name specified in the request message to the storage unit.

  While the connection information is stored in the storage unit, the acquisition unit acquires the data identification name specified for each of the stored connection information without duplication, and for each data identification name obtained without duplication, data Fragments obtained by dividing the data associated with the identification names are acquired in a predetermined cyclic order, and when the fragments are acquired, the fragment transmission unit identifies the fragments in the fragments and the fragment source data of the fragments. A fragment message designating the position where the fragment was placed is transmitted to each terminal apparatus having the terminal identification name designated in the connection information that caused the fragment to be acquired.

  The completion receiving unit receives a completion message designating a data identification name from any of the plurality of terminal devices, and when the deletion unit receives the completion message, the terminal identification name of the terminal device that is the transmission source of the completion message, The connection information specifying the data identification name specified in the request message is deleted from the storage unit.

  Further, in the server device, the request receiving unit and the completion receiving unit respectively receive the request message and the completion message by the connection type protocol, and the fragment transmission unit transmits the fragment message by the connectionless type protocol.

  The connection-type protocol is a protocol used in a communication mode in which a connection is established before data transmission between terminals that transmit and receive data when communication is started and the connection relationship is maintained until communication is completed. The connectionless protocol is a protocol used in a communication mode in which a packet specifying a destination address is transmitted without establishing a connection between transmitting and receiving terminals.

According to the present invention, a request message and a completion message, which are transmission / reception forms for which communication is to be reliably performed, use a connection-type protocol, and a fragment message, which is a transmission form for reducing transmission / reception load rather than connection, is a connectionless Protocol can be used.
In addition, it is possible to reduce the overload by suppressing the use of a connection with a high communication load and performing most of the communication without connection.

Further, in the server device of the present invention, the connection type protocol is TCP (Transmission Control Protocol), and the connectionless type protocol is UDP (User Datagram Protocol).
According to the present invention, it is possible to use an appropriate transport layer protocol corresponding to the connection type or the connectionless type.

In the server device of the present invention, the server device further includes a connection receiver.
Here, the deletion unit, for each of the connection information stored in the storage unit, when the connection message transmitted from the terminal device having the terminal identification name connected to the connection information has not been received for a predetermined threshold time or more, The connection information is deleted from the storage unit.

That is, when the connection message transmitted from the terminal device is not received for a certain period, it is determined that the communication has been disconnected, and the connection information corresponding to the connection message is deleted from the storage unit.
According to the present invention, by confirming the presence or absence of a connection message, useless transmission can be omitted and the communication load can be suppressed.

  A terminal device according to another aspect of the present invention is a terminal device in the distribution system.

That is, the terminal device includes a request transmission unit, a fragment reception unit, a storage unit, a restoration unit, and a completion transmission unit.
Here, the request transmission unit transmits a request message specifying the data identification name of the desired data to the server device, and the fragment reception unit receives the fragment message from the server device until the desired data is restored. The accumulating unit accumulates the fragment specified in the received fragment message and the position where the fragment is arranged in the desired data in association with each other.

  When all the fragments obtained by dividing the desired data are accumulated, the restoration unit stores each of the accumulated fragments and the position accumulated in association with each of the accumulated fragments. The desired transmission data is restored, and when the desired data is restored, the completion transmitting unit transmits a completion message designating the data identification name of the desired data to the server device.

The terminal device of the present invention further includes a connection transmission unit.
Here, after transmitting the request message, the connection transmission unit transmits the connection message to the server device at a predetermined time interval until the desired data is restored.

  That is, the connection transmission unit transmits a connection message at a constant time interval, so that the server device side can confirm the connection.

  A service method according to another aspect of the present invention is a service method executed in a server device, and the server device includes a storage unit, a request reception unit, an addition unit, an acquisition unit, a fragment transmission unit, and a completion reception unit. And a deletion unit, which includes a request reception process, an addition process, an acquisition process, a fragment transmission process, a completion reception process, and a deletion process, and is configured as follows.

  That is, in the request receiving step, the request receiving unit receives a request message for designating a data identification name from any of a plurality of terminal devices.

  In the adding step, when the requesting message is received, the adding unit stores connection information that specifies the terminal identification name of the terminal device that has transmitted the request message and the data identification name specified in the request message, Add to

  In the acquisition step, the acquisition unit acquires the data identification name specified for each of the stored connection information without duplication while the connection information is stored in the storage unit, and the data identification name obtained without duplication Each time, a fragment obtained by dividing the data associated with the data identification name is acquired in a predetermined cyclic order.

  In the fragment transmission step, when the fragment transmission unit acquires the fragment, a fragment message that specifies the fragment and the position where the fragment is located in the fragment source data Is transmitted to each of the terminal devices having the terminal identification name specified in the connection information that has been acquired.

  In the completion reception step, the completion reception unit receives a completion message designating a data identification name from any of the plurality of terminal devices.

  In the deletion step, when the deletion unit receives the completion message, the connection information in which the terminal identification name of the terminal device that has transmitted the completion message and the data identification name specified in the request message are specified Are deleted from the storage unit.

  A terminal method according to another aspect of the present invention is a terminal method executed in a terminal device communicably connected to a server device, and the terminal device includes a request transmission unit, a fragment reception unit, a storage unit, and a restoration unit. And a completion transmission unit, which includes a request transmission process, a fragment reception process, an accumulation process, a restoration process, and a completion transmission process, and is configured as follows.

  That is, in the request transmission step, the request transmission unit transmits a request message for designating a data identification name of desired data to the server device.

  In the fragment receiving step, the fragment receiving unit receives a fragment message from the server device until the desired data is restored.

  In the accumulation step, the accumulation unit accumulates the fragment specified in the received fragment message and the position where the fragment is arranged in the desired data in association with each other.

  In the restoration process, when all the fragments obtained by dividing the desired data are accumulated by the restoration unit, the fragments are accumulated in association with each of the accumulated fragments and each of the accumulated fragments. The desired data is restored from the position.

  In the completion transmission step, when the desired data is restored, the completion transmission unit transmits a completion message designating the data identification name of the desired data to the server device.

  A program according to another aspect of the present invention is configured to cause a computer to function as a server device and cause the computer to execute a service method. The server device includes a request reception unit, an addition unit, an acquisition unit, a fragment transmission unit, and a completion. A receiving unit and a deleting unit are provided.

  Here, the storage unit stores connection information in which a terminal identification name and a data identification name are designated, and the request reception unit receives a request message for designating the data identification name from any of a plurality of terminal devices. Then, when receiving the request message, the adding unit adds connection information specifying the terminal identification name of the terminal device that is the transmission source of the request message and the data identification name specified in the request message to the storage unit.

  While the connection information is stored in the storage unit, the acquisition unit acquires the data identification name specified for each of the stored connection information without duplication, and for each data identification name obtained without duplication, data Fragments obtained by dividing the data associated with the identification names are acquired in a predetermined cyclic order, and when the fragments are acquired, the fragment transmission unit identifies the fragments in the fragments and the fragment source data of the fragments. A fragment message designating the position where the fragment was placed is transmitted to each terminal apparatus having the terminal identification name designated in the connection information that caused the fragment to be acquired.

  The completion receiving unit receives a completion message designating a data identification name from any of the plurality of terminal devices, and when the deletion unit receives the completion message, the terminal identification name of the terminal device that is the transmission source of the completion message, The connection information in which the data identification name specified in the request message is specified is deleted from the storage unit.

  A program according to another aspect of the present invention is configured to cause a computer to function as a terminal device and cause the computer to execute a terminal method. The terminal device includes a request transmission unit, a fragment reception unit, a storage unit, a restoration unit, and a completion. A transmission unit is provided.

  Here, the request transmission unit transmits a request message designating the data identification name of the desired data to the server device, and the fragment reception unit receives the fragment message from the server device until the desired data is restored. The accumulating unit accumulates the fragments specified in the received fragment message and the positions where the fragments are arranged in the desired data in association with each other.

  Then, when all the fragments obtained by dividing the desired data are accumulated, the restoration unit, from each of the accumulated fragments, and the position accumulated in association with each of the accumulated fragments, When the desired data is restored, the completion transmission unit transmits a completion message designating the data identification name of the desired data to the server device.

The program of the present invention can be recorded on a computer-readable information storage medium such as a compact disk, flexible disk, hard disk, magneto-optical disk, digital video disk, magnetic tape, and semiconductor memory.
The above program can be distributed and sold via a computer communication network independently of the computer on which the program is executed. The information storage medium can be distributed and sold independently from the computer.

  ADVANTAGE OF THE INVENTION According to this invention, when acquiring the same data with a some terminal via a network, the delivery system which can reduce the burden of a server, and can improve the transmission efficiency of data, a server apparatus, a terminal device, and a service method , A terminal method, and a program that implements these on a computer can be provided.

It is a mimetic diagram showing the outline composition of the typical information processor with which the distribution system concerning the embodiment of the present invention is realized. It is explanatory drawing which shows schematic structure of the delivery system which concerns on one of embodiment of this invention. It is a sequence diagram which shows the mode of the exchange of various communications in this embodiment. It is a sequence diagram which shows the mode of the exchange of various communications in this embodiment. It is a schematic diagram which shows schematic structure of the server apparatus which concerns on this embodiment. It is a flowchart which shows the flow of control of the service process of the service method performed with the server apparatus which concerns on this embodiment. It is a flowchart which shows the flow of control of the reception process of the service method performed with the server apparatus which concerns on this embodiment. It is a flowchart which shows the flow of control of the transmission process of the service method performed with the server apparatus which concerns on this embodiment. It is a figure which shows the data storage condition in the memory | storage part of the server apparatus which concerns on this embodiment. It is a schematic diagram which shows schematic structure of the terminal device which concerns on this embodiment. It is a flowchart which shows the flow of control of the terminal process of the terminal method performed with the terminal device which concerns on this embodiment.

  Embodiments of the present invention will be described below. In the following, for ease of understanding, an embodiment in which the present invention is realized using a game information processing device will be described. However, the embodiment described below is for explanation, and the present invention It does not limit the range. Therefore, those skilled in the art can employ embodiments in which these elements are replaced with equivalent ones, and these embodiments are also included in the scope of the present invention.

(Embodiment 1)
FIG. 1 is a schematic diagram showing a schematic configuration of a typical information processing apparatus in which a distribution system according to an embodiment of the present invention is realized. Hereinafter, a description will be given with reference to FIG.

  The information processing apparatus 100 includes a CPU (Central Processing Unit) 101, a ROM 102, a RAM (Random Access Memory) 103, an interface 104, a controller 105, an external memory 106, an image processing unit 107, and a DVD-ROM. (Digital Versatile Disc ROM) drive 108, NIC (Network Interface Card) 109, and audio processing unit 110.

  A DVD-ROM storing a game program and data is loaded into the DVD-ROM drive 108 and the information processing apparatus 100 is turned on to execute the program, thereby realizing the distribution system and the like of the present embodiment. Is done.

  The CPU 101 controls the overall operation of the information processing apparatus 100 and is connected to each component to exchange control signals and data. Further, the CPU 101 uses arithmetic operations such as addition / subtraction / multiplication / division, logical sum, logical product, etc. using an ALU (Arithmetic Logic Unit) (not shown) for a storage area called a register (not shown) that can be accessed at high speed. , Logic operations such as logical negation, bit operations such as bit sum, bit product, bit inversion, bit shift, and bit rotation can be performed. In addition, the CPU 101 itself is configured so that saturation operations such as addition / subtraction / multiplication / division for multimedia processing, vector operations such as trigonometric functions, etc. can be performed at a high speed, and those provided with a coprocessor. There is.

  The ROM 102 records an IPL (Initial Program Loader) that is executed immediately after the power is turned on, and when this is executed, the program recorded on the DVD-ROM is read out to the RAM 103 and execution by the CPU 101 is started. The The ROM 102 stores an operating system program and various data necessary for operation control of the entire information processing apparatus 100.

  The RAM 103 is for temporarily storing data and programs, and holds programs and data read from the DVD-ROM and other data necessary for game progress and chat communication. In addition, the CPU 101 provides a variable area in the RAM 103, performs an operation by directly operating the ALU on the value stored in the variable, and temporarily stores the value stored in the RAM 103 in a register. Performs an operation on the register and writes the result back to the memory.

  The controller 105 connected via the interface 104 receives an operation input performed when the user executes the game.

  The external memory 106 detachably connected via the interface 104 stores data indicating game play status (past results, etc.), data indicating the progress of the game, and log of chat communication in a network battle ( Data) is stored in a rewritable manner. The user can record these data in the external memory 106 as appropriate by inputting an instruction via the controller 105.

  A DVD-ROM mounted on the DVD-ROM drive 108 stores a program for realizing the game and image data and audio data associated with the game. Under the control of the CPU 101, the DVD-ROM drive 108 performs a reading process on the DVD-ROM loaded therein, reads out necessary programs and data, and these are temporarily stored in the RAM 103 or the like.

  The image processing unit 107 processes the data read from the DVD-ROM by an image arithmetic processor (not shown) included in the CPU 101 or the image processing unit 107, and then processes the processed data on a frame memory ( (Not shown). The image information recorded in the frame memory is converted into a video signal at a predetermined synchronization timing and output to a monitor (not shown) connected to the image processing unit 107. Thereby, various image displays are possible.

  The image calculation processor can execute a two-dimensional image overlay calculation, a transmission calculation such as α blending, and various saturation calculations at high speed.

  Also, polygon information arranged in the virtual three-dimensional space and added with various texture information is rendered by the Z buffer method, and the polygon arranged in the virtual three-dimensional space from the predetermined viewpoint position is determined in the direction of the predetermined line of sight It is also possible to perform high-speed execution of operations for obtaining rendered images.

  Further, the CPU 101 and the image arithmetic processor cooperate to draw a character string as a two-dimensional image in the frame memory or draw it on the surface of each polygon according to the font information that defines the character shape. Is possible. The font information is recorded in the ROM 102, but it is also possible to use dedicated font information recorded in the DVD-ROM.

  The NIC 109 is used to connect the information processing apparatus 100 to a computer communication network (not shown) such as the Internet, and is based on the 10BASE-T / 100BASE-T standard used when configuring a LAN (Local Area Network). To connect to the Internet using an analog modem, ISDN (Integrated Services Digital Network) modem, ADSL (Asymmetric Digital Subscriber Line) modem, cable television line A cable modem or the like and an interface (not shown) that mediates between these and the CPU 101 are configured.

  The audio processing unit 110 converts audio data read from the DVD-ROM into an analog audio signal and outputs the analog audio signal from a speaker (not shown) connected thereto. Further, under the control of the CPU 101, sound effects and music data to be generated during the progress of the game are generated, and sound corresponding to this is output from the speaker.

  When the audio data recorded on the DVD-ROM is MIDI data, the audio processing unit 110 refers to the sound source data included in the audio data and converts the MIDI data into PCM data. If the compressed audio data is in ADPCM format or Ogg Vorbis format, it is expanded and converted to PCM data. The PCM data can be output by performing D / A (Digital / Analog) conversion at a timing corresponding to the sampling frequency and outputting it to a speaker.

  Furthermore, a microphone (not shown) can be connected to the information processing apparatus 100 via the interface 104. In this case, the analog signal from the microphone is subjected to A / D conversion at an appropriate sampling frequency so that processing such as mixing in the audio processing unit 110 can be performed as a PCM format digital signal.

  When the information processing apparatus 100 is used as a karaoke apparatus, voice data read from a DVD-ROM or voice data acquired from a computer communication network via the NIC 109 is used as accompaniment data, and voice data input from a microphone Singing data, the audio processing unit 110 mixes the accompaniment data and the singing data, and outputs them from the speaker. Moreover, it is possible to output sound using headphones (not shown) or earphones (not shown) instead of the speakers.

  In addition, the information processing apparatus 100 uses a large-capacity external storage device such as a hard disk so as to perform the same function as the ROM 102, the RAM 103, the external memory 106, the DVD-ROM mounted on the DVD-ROM drive 108, and the like. You may comprise.

  Further, it is possible to adopt a form in which a keyboard for accepting a character string editing input from a user, a mouse for accepting various position designations and selection inputs, and the like are connected. In addition, a general-purpose personal computer can be used instead of the information processing apparatus 100 of the present embodiment.

  The information processing apparatus 100 described above corresponds to a so-called “consumer video game apparatus”. However, the information processing apparatus 100 may be used on various computers such as a mobile phone, a mobile game device, a karaoke apparatus, and a general business computer. It is possible to realize the invention.

  For example, a general computer includes an CPU, a RAM, a ROM, a DVD-ROM drive, and an NIC as in the information processing apparatus 100, and an image processing unit having a simpler function than the information processing apparatus 100. In addition to having a hard disk as an external storage device, a flexible disk, a magneto-optical disk, a magnetic tape, and the like can be used. Further, not the controller 105 but a keyboard or a mouse is used as an input device.

  FIG. 2 is an explanatory diagram showing a schematic configuration of a distribution system according to one embodiment of the present invention. Hereinafter, a description will be given with reference to FIG.

  The distribution system 200 includes a server device 201 and a plurality of terminal devices 202 (202a, 202b, 202c, 202d,... 202n). The server device 201 and the plurality of terminal devices 202 are connected via the Internet 203. ing. The server device 201 is a data server device that is maintained and managed by a data provider. As the memory of the server apparatus 201, a cache memory can be used, and high-speed access can be achieved by copying a part of the data in the main memory. The plurality of terminal devices 202 are terminal devices maintained and managed by data users.

  In response to the transmission signal from the terminal device 202, the server device 201 transmits the content requested by the terminal device 202 for each terminal device.

3 and 4 are sequence diagrams showing how various communications are exchanged in the present embodiment.
Hereinafter, description will be given with reference to the drawings.

  The server device 201 stores data to be provided to the terminal device 202. Each data is given a data identification name such as A, B, C,. Each data is divided into a plurality of fragments for each data identification name. And the position information which shows the position where the said fragment was arrange | positioned in the said data is provided to the fragment. For example, when the data having the data identification name A is divided into six fragments, fragments a1 to a6 are formed, and (1/6), (2/6), (3/6) in the arrangement order. ), (4/6), (5/6), and (6/6) position information is assigned to each fragment.

  Each fragment has the same size. For example, the content A is divided into six fragments a1 to a6, and the content B is divided into eight fragments b1 to b8 according to the size of the entire data. The

The data is most often provided in a format called “file”, but any data may be used as long as it is configured as a so-called byte string or bit string.
As the “identification name”, a file name is most commonly used. When data constitutes a part of large data (for example, in the case of an overlay module in a program), a combination of position information and size information searched by the large database becomes an “identification name”. . Further, when the result searched by the database is “data”, a search expression (SQL expression or the like) used for the search may be “identification name”.

  Here, when the terminal device 202a requests the server device 201 for the content A, the server device 201 cyclically transmits the divided fragments a1 to a6 from a1. If the terminal device 202a receives all pieces of content A, the terminal device 202a transmits a completion message to the server device 201 after restoring the data. Thereby, the fragment transmission from the server apparatus 201 is completed.

  Next, a method for transmitting content data when a plurality of terminal devices 202 request the same content data at different times will be described with reference to the drawings.

  When the server device 201 receives a signal requesting the content B from the terminal device 202b, the data of the content B divided into eight fragments b1 to b8 starts to be sequentially transmitted from the fragment b1 to the terminal device 202b.

  When the server device 201 transmits up to the content B fragments b1 and b2 to the terminal device 202b, a signal requesting the same content B is received from the terminal device 202c. In this case, since the server apparatus 201 has already transmitted the fragments up to the fragments b1 and b2 to the terminal device 202b, the server device 201 transmits the fragment b3 to the terminal devices 202b and 202c.

  Since the terminal device 202b has received the data of the content B from the fragment b1, when receiving the last fragment b8, the terminal device 202b restores the content B, transmits a completion message to the server device 201, and receives the fragment. Exit.

  On the other hand, since the terminal device 202c has started reception from the fragment b3, after receiving up to the fragment b8 and further receiving up to the fragments b1 and b2, the content B is restored and completed to the server device 201. Send the message and finish receiving the fragment.

The terminal device 202d requests the B content to the server device 201 when the server device 201 transmits up to the fragment b4 to the terminal devices 202b and 202c.
In that case, the server apparatus 201 transmits to the terminal apparatus 202d from the fragment b5.

  Even if the fragment b6 cannot be received due to a communication failure or the like, the terminal device 202d continues to receive the fragments b7 and b8. Then, as illustrated in FIGS. 3 and 4, the terminal device 202d continuously receives the fragments b1 to b4 distributed before b5 received first.

Furthermore, since the terminal device 202d cannot acquire b6, it receives up to b5 and b6. The terminal device 202d receives the fragment b5 redundantly. This system is a system that prioritizes reducing the load on the server device 201 over receiving duplicates.
Note that the fragment b5 received in duplicate is discarded in the terminal device 202d.

  Since the terminal device 202d has acquired all the fragments for the content B at the time of acquiring the fragment b6, the terminal device 202d transmits a completion message to the server device 201 after restoring the content B.

  In accordance with such a processing procedure, the plurality of terminal apparatuses 202 receive provision of data from the server apparatus 201. In this case, by dividing the data into a plurality of fragments and cyclically transmitting the data to the terminal device 202, the server device 201 is not subjected to a load as compared to when transmitting all the content data individually to the terminal device. Processing can continue.

  Each fragment is transmitted using a communication protocol called UDP. If UDP is used, it is not determined whether or not the destination has been reached, so that high-speed communication is possible.

  FIG. 5 is a schematic diagram showing a schematic configuration of the server apparatus according to the present embodiment. FIG. 6 is a flowchart showing a flow of control of service processing of a service method executed by the server device according to the present embodiment. FIG. 7 is a flowchart showing a flow of control of reception processing of a service method executed by the server device according to the present embodiment. FIG. 8 is a flowchart showing a flow of control of the transmission process of the service method executed by the server device according to the present embodiment. Hereinafter, a description will be given with reference to FIG. In the following description, a case where the server apparatus 201 is realized on the information processing apparatus 100 will be described as an example.

  The server apparatus 201 includes a request reception unit 501, an addition unit 502, a storage unit 503, an acquisition unit 504, a fragment transmission unit 505, a completion reception unit 506, a connection reception unit 507, and a deletion unit 508.

  Here, the storage unit 503 stores the data in association with the data identification name. The data is data that will be downloaded to the terminal device 202 in the future.

  As shown in FIG. 6, in this service process, the server apparatus 201 is initialized (step S601), and the reception process (step S602) and the transmission process (step S603) are started in parallel.

As shown in FIG. 7, when the reception process starts, the server apparatus 201 receives a message from the terminal apparatus 202 (step S701), and determines the type of the message (step S702).
If the message is a request message, the message is received by the request reception unit 501. The request message is a message that designates the terminal identification name of the transmission source terminal device that transmitted the request and the data identification name of the requested content or the like.

  When the request message is received by the request receiving unit 501, the data identification name and the terminal identification name are added as connection information to the storage unit 503 by the adding unit 502 (step S703).

  On the other hand, when the message is a completion message transmitted when the data requested by the terminal device 202 is restored, the deletion unit 508 uses the terminal identification name of the terminal device 202 and the data identification name specified in the request message. It deletes from the recording part 503 (step S704).

  If the message is a connection message from the terminal device 202 and the message is received by the connection reception unit 507, the time is recorded (step S705).

  When the server apparatus 201 receives another message, the server apparatus 201 performs processing according to the message (step S706).

  After the processing corresponding to each message is completed, it is determined in the storage unit 503 whether or not the recorded time is much earlier. If the recorded time is much earlier (step S707; YES) ), Data corresponding to the corresponding message is deleted from the storage unit 503 (step S708). If the recorded time is not much before (step S707; NO), the data is not deleted. This series of processing is repeated for all terminal devices 202 (step S709).

  The terminal identification name and the data identification name stored in the storage unit 503 by the adding unit 502 are stored in the storage unit 503 as connection information. The acquisition unit 504 acquires the data identification names received from the plurality of terminal devices 202 without duplication. For example, when three types of data of data identification names A, B, and C are acquired in the order of AABACCAB in time series, the acquisition unit 504 acquires one data identification name for each of A, B, and C. .

  Then, for each acquired data identification name, the data is divided to obtain fragments. For example, the data identification name A is divided into six to obtain six pieces.

  The size of each fragment is preferably a size suitable for transmission as a UDP communication packet. This varies depending on the network conditions, but the size can be statistically obtained from the past communication history.

Furthermore, each acquired fragment is designated at the position where it was arranged with the original data. For example, it is assumed that information indicating that the fragment is the XXth fragment counted from the top of the XX fragments is designated in a predetermined format.
More specifically, the six fragments obtained by dividing the data identification name A into six are (1/6), (2/6), (3 / 6), (4/6), (5/6), (6/6) location information is given.

  The original data identification name may be expressed by determining an appropriate character string format as in the above example, or may be expressed in an identification number format by an integer.

  When specifying the fragment itself, specify the checksum etc. together to detect that the data has been corrupted due to a communication failure in the middle of the communication path, or that the data has been altered due to interference from a third party. Also good.

  Therefore, the storage unit 503 stores the terminal identification name of the data request source, the corresponding data identification name, the data itself, the fragment itself, and the fragment position information.

Then, the fragment is transmitted from the fragment transmitting unit 505 to the requesting terminal device 202 as a fragment message together with the fragment position information.
As shown in FIG. 8, the fragment transmission (step S804) is repeatedly performed for each data identification name (step S803) for each terminal device 202 (step S801), for each fragment (step S802).

  Here, the data storage state in the storage unit 503 will be described with reference to FIG. 9 along the flow of FIG. 3 and FIG.

  A table 900 in FIG. 9 shows how the connection information accumulation state of the storage unit 503 changes, when the system is activated, when each terminal device 202a to 202d transmits a content request signal and when a completion message is transmitted. It is shown as a time series in the standard.

  At the time (t0) when the system is started up, the storage unit 503 has the connection information data empty. First, when a message requesting data of content A is transmitted from the terminal device 202a (t1), the adding unit 502 adds the terminal identification name X and the data identification name A of the terminal device 202a to the storage unit 503. The That is, the storage unit 503 stores connection information (terminal device name, data identification name) in the format (X, A). The server apparatus 201 cyclically transmits the fragments a1 to a6 corresponding to the data identification name A to the terminal apparatus 202a.

  Next, when a message requesting content B data is transmitted from the terminal device 202b (t2), the adding unit 502 adds the terminal identification name Y and the data identification name B of the terminal device 202b to the storage unit 503. Is done. At this time, the storage unit 503 stores (X, A), (Y, B) as connection information. The server apparatus 201 cyclically transmits the fragments b1 to b8 corresponding to the data identification name B to the terminal apparatus 202b.

  Furthermore, when a message requesting data of content B is transmitted from the terminal device 202c (t3), the terminal identification name Z and the data identification name B of the terminal device 202c are added to the storage unit 503 by the adding unit 502. The At this time, the storage unit 503 stores (X, A), (Y, B), (Z, B) as connection information. The server apparatus 201 cyclically transmits the fragments b1 to b8 corresponding to the data identification name B to the terminal apparatus 202c.

  When a message requesting data of content B is transmitted from the terminal device 202d (t4), the adding unit 502 adds the terminal identification name W and the data identification name B of the terminal device 202d to the storage unit 503. The The server apparatus 201 cyclically transmits the fragments b1 to b8 corresponding to the data identification name B to the terminal apparatus 202d.

  At this time, (X, A), (Y, B), (Z, B), (W, B) are stored in the storage unit 503 as connection information.

  Thereafter, when the terminal device 202a receives all fragments and transmits a completion message to the server device 201 (t5), the connection information (X, A) of the terminal device 202a stored in the storage unit 503 is deleted. The part 508 is deleted. Therefore, (Y, B), (Z, B), (W, B) remain as connection information in the storage unit 503.

  Similarly, when the terminal device 202b transmits a completion message to the server device 201 (t6), the connection information (Y, B) in the storage unit 503 is deleted, so the storage unit 503 stores (Z, B) and (W, B) remain.

  Furthermore, when the terminal device 202c transmits a completion message (t7), the connection information (Z, B) is deleted from the storage unit 503 by the deletion unit 508, so that (W, B) is stored as the connection information. Part 503 remains.

  Finally, when the terminal device 202d transmits a completion message (t8), the connection information (W, B) is deleted from the storage unit 503, and the connection information in the storage unit 503 becomes empty at this point.

   In these series of processes, the server apparatus 201 does not manage which terminal apparatus 202 has obtained which fragment, and therefore, the server apparatus 201 has a small calculation processing load and performs efficient server processing. Can do.

  The request message and the completion message received by the server device 201 are received by a connection type protocol.

  The connection-type protocol is characterized in that when communication is started, a connection request is issued from the transmission side, a connection response is received from the other party, and data is transmitted after the connection is established. When data is transmitted from the transmitting side, the receiving side sends an acknowledgment (Acknowledgment :: ACK) to notify that it has been received reliably.

  The connection-type protocol is often used when reliable data transmission is desired without giving priority to communication efficiency. Also in this embodiment, since it is desired to transmit and receive the request message and the completion message reliably, it is preferable to use a connection type protocol.

  TCP (Transmission Control Protocol) is used in the transport layer of the Internet.

  On the other hand, it is preferable to use a connectionless protocol for the fragment message transmitted from the server device.

  The connectionless protocol is a communication protocol that does not establish a connection before starting data transmission. Since the connectionless protocol transmits data by designating only the destination, there is no processing such as establishment of a connection or transmission of communication data such as ACK, so that communication efficiency is high.

  Also in the present embodiment, for fragment transmission / reception, it is preferable to use a connectionless protocol because communication efficiency is required even if communication reliability is sacrificed to some extent.

  UDP (User Datagram Protocol) is employed in the transport layer of the Internet. UDP is a communication protocol in which all TCP functions other than port numbers are deleted.

  As described above, in this embodiment, the data requested by the transmission source is divided into a plurality of fragments and transmitted cyclically, thereby reducing the load on the server device.

   In addition, in the transmission and reception of data in the server device, the received message and the completion message that are received use a reliable connection type protocol, and the data fragment that is the message to be transmitted is connected to the connectionless protocol. By using it, the load on the server device can be further reduced.

  FIG. 10 is a schematic diagram illustrating a schematic configuration of the terminal device according to the present embodiment. FIG. 11 is a flowchart showing a control flow of terminal processing of the terminal method executed by the terminal device according to the present embodiment. Hereinafter, a description will be given with reference to FIG. In the following description, a case where the terminal device 202 is realized on the information processing apparatus 100 will be described as an example.

  Each of the plurality of terminal devices 202 includes a request transmission unit 1001, a connection transmission unit 1002, a fragment reception unit 1003, a storage unit 1004, a restoration unit 1005, and a completion transmission unit 1006.

  When this process is started, the request transmission unit 1001 of each terminal device 202 transmits a request message to the server device 201. (Step S1101) The request message includes the data identification name of the requested data and the terminal identification name that is the transmission source.

  Each terminal device 202 determines whether or not a fragment message has arrived from the server device 201. If the fragment message has arrived (step S1102; YES), the data generated by the server device 201 via the NIC 109 is determined. Are received cyclically by the fragment receiver 1003 (step S1103).

  If the received fragment is a fragment received for the first time (step S1104; YES), in the storage unit 1004, the data content of the fragment specified by the fragment message and where the fragment is located in the original data. Position information indicating whether or not it has been stored is stored in association with each other (step S1105).

  If the received fragment is a fragment that has already been received (step S1104; NO), the fragment is deleted (step S1106), and it is determined whether a new fragment has arrived (step S1102).

  If the fragment message has not arrived (step S1102; NO), it is determined whether or not a certain time has passed. If the certain time has passed (step S1107; YES), the connection transmission unit 1002 connects. A message is transmitted (step S1108) and prepared for the arrival of the fragment message (step S1102). If the predetermined time has not elapsed (step S1107; NO), the connection message is not transmitted, and the fragment message is prepared for arrival (step S1102).

  When the storage unit 1004 stores the fragments and the position information thereof, it is further determined whether all the requested fragments have been stored (step S1109). When all the fragments of the requested data are stored (step S1109) Step S1109; YES), based on the position information, the restoration unit 1005 restores the data (step S1010). Then, the completion transmission unit 1006 transmits a completion message to the server apparatus 201 (step 1011), and the process is terminated.

On the other hand, if not all fragments have been accumulated (step 1109; NO), it is determined whether or not a certain time has passed (step S1107). If a certain time has passed (step S1107; (YES), a connection message is transmitted from the connection transmission unit 1002 to the server device 201 (step S1108) to prepare for the arrival of the fragment message (step S1102).
If the predetermined time has not elapsed (step S1107; NO), the connection message is not transmitted, and the fragment message is prepared for arrival (step S1102).
This process is repeated until all fragments are acquired.

  Here, the process in which the fragments are accumulated in the terminal device 202 will be described below by taking the processing flow in the terminal device 202d in FIGS. 3 and 4 as an example.

  When the terminal device 202d transmits a request message for requesting B content, the server device 201 has already transmitted up to the fragment B4 of the content B, and therefore transmits the fragment b5 to the terminal 202d.

  When transmitting the fragment, the server apparatus 201 transmits the fragment itself including the fragment itself and the arrangement position information of the fragment source. Therefore, when the terminal device 202d receives the fragment b5, the fragment itself b5 and fragment position information, that is, data (b5, 5/8) are received and stored in the storage unit 1004.

  Since the fragment b6 cannot be received due to a reception error, no data is stored in the storage unit 1004. Since the fragment b7 is received, it is stored in the storage unit 904 as data (b7, 7/8). At this time, the storage unit 1004 stores data (b5, 5/8) and (b7, 7/8).

The fragment b8 is also received, and data (b8, 8/8) is accumulated in the accumulation unit 1004.
Therefore, the storage unit 1004 stores data (b5, 5/8), (b7, 7/8), and (b8, 8/8).

  Since the fragments are transmitted cyclically, subsequently, since the fragment message is received by the terminal device 202d in the order of the fragment b1, the fragment b2, the fragment b3, and the fragment b4, the storage unit 904 stores ( b5, 5/8), (b7, 7/8), (b8, 8/8), (b1, 1/8), (b2, 2/8), (b3, 3/8), (b4, 4/8) will be accumulated.

If the terminal device 202d has not made a reception error, all the fragments are prepared at this stage, but since the fragment b6 has not been received, the terminal device 202d continues receiving.
That is, the terminal device 202d receives the fragment messages in the order of fragment b5 and fragment b6, but since the fragment b5 has already been received, it is not stored in the storage unit 1004, and the fragment message (b6, 6 of the fragment b6 is not stored. / 8) only is stored in the storage unit 1004.

  At this time, all the pieces of content B are collected, and the storage unit 1004 has (b5, 5/8), (b7, 7/8), (b8, 8/8), (b1, 1 / 8), (b2, 2/8), (b3, 3/8), (b4, 4/8), (b6, 6/8) data are accumulated.

  Each piece of data stored in the storage unit 1004 is rearranged in a formal order based on position information given to each fragment. That is, (b1, 1/8), (b2, 2/8), (b3, 3/8), (b4, 4/8), (b5, 5/8), (b6, 6/8), The content B is restored by rearranging (b7, 7/8) and (b8, 8/8).

  In the present embodiment, the data storage process in the storage unit 1004 has been described by taking the terminal device 202d as an example, but similar processing is performed in the other terminal devices 202a, 202b, and 202c.

  In this way, since the requested data is cyclically received in the state of fragments in the terminal device 202, the burden on the server device 201 can be reduced. Furthermore, since the server apparatus 201 can always check the connection status based on the connection signal transmitted from the terminal apparatus 202, it is possible to avoid performing unnecessary communication between the two.

(Modification 1)
If the fragment cannot be received due to a bad communication state or the like, in the above embodiment, the unacquired fragment is acquired by repeatedly acquiring the fragment transmitted cyclically. According to the example, only unacquired fragments can be received individually. Hereinafter, the fragment receiving method will be described.

  In the terminal device 202, since the position information of the fragments is accumulated in the accumulation unit 1004, the number of fragments received and the position information within a certain period can be confirmed. For example, when pieces of content B are obtained from b1 to b8, if all pieces are obtained, the position information is 1/8 to 8/8, and the terminal device 202 receives the pieces with a probability of 100%. Will be.

  On the other hand, if the fragments b3 and b5 are not received during the acquisition of the fragments b1 to b8, it is found that there is no position information 3/8, 5/8, and the terminal device 202 has a probability of 3/4. It can be seen that the fragment is received.

In this way, by confirming the number of pieces and position information within a certain period, it is possible to determine whether or not the communication status in that period is good.
Therefore, if the terminal device 202 is equal to or higher than a certain value of the reception probability, the terminal device 202 determines that the communication status is good and instructs the server device 201 to retransmit the fragment that could not be received.
The server apparatus 201 that has received the instruction transmits the fragment individually.

  When the server apparatus 201 transmits the fragment, it is desirable to use a connection-type communication protocol because it is necessary to transmit the fragment reliably.

  On the other hand, if the reception probability is equal to or less than a certain value, it is determined that the communication status is not good, and no retransmission instruction is issued from the terminal device 202. In this case, fragment transmission in the UDP format, which is the transmission method in the above embodiment, is performed.

  Thus, according to this modification, if the communication state between the server device and the terminal device is good, it is possible to individually acquire unreceived fragments and quickly restore data in the terminal device. Can be executed.

  As described above, a distribution system, a server device, a terminal device, and a service method that can reduce the load on the server and improve the data transmission efficiency when acquiring the same data by a plurality of terminals via a network. , A terminal method, and a program that implements these on a computer can be provided.

100 Information processing apparatus 101 CPU
102 ROM
103 RAM
104 Interface 105 Controller 106 External Memory 107 Image Processing Unit 108 DVD-ROM Drive 109 NIC
110 voice processing unit 200 distribution system 201 server device 202 terminal device 203 network 501 request receiving unit 502 adding unit 503 storage unit 504 obtaining unit 505 fragment transmitting unit 506 completion receiving unit 507 connection receiving unit 508 deleting unit 1001 request transmitting unit 1002 connection transmission Unit 1003 fragment receiving unit 1004 accumulating unit 1005 restoring unit 1006 completion transmitting unit

Claims (11)

A distribution system having a server device and a plurality of terminal devices connected to be communicable with the server device,
(A) The server device
A storage unit for storing connection information for specifying a terminal identification name and a data identification name;
A request receiving unit for receiving a request message designating a data identification name from any of the plurality of terminal devices;
When the request message is received, the connection information specifying the terminal identification name of the terminal device that is the transmission source of the request message and the data identification name specified in the request message is added to the storage unit Part,
While the connection information is stored in the storage unit, the data identification name specified for each of the stored connection information is obtained without duplication, and the data is obtained for each data identification name obtained without duplication. An acquisition unit that acquires a fragment obtained by dividing data associated with an identification name in a predetermined cyclic order;
When the fragment is acquired, the fragment message that specifies the fragment and the position where the fragment is located in the data that is the source of the fragment, and the connection that caused the fragment to be acquired A fragment transmitter for transmitting to each of the terminal devices having the terminal identification name specified in the information;
A completion receiving unit for receiving a completion message designating a data identification name from any of the plurality of terminal devices;
When the completion message is received, the connection information in which the terminal identification name of the terminal device that is the transmission source of the completion message and the data identification name specified in the request message are deleted from the storage unit With a deletion part
(B) Each of the plurality of terminal devices is
A request transmission unit for transmitting a request message for designating a data identification name of desired data to the server device;
A fragment receiver for receiving a fragment message from the server device until the desired data is restored;
An accumulation unit that accumulates the fragment specified in the received fragment message and the position where the fragment is arranged in the desired data in association with each other;
When all the fragments obtained by dividing the desired data are accumulated, each desired fragment is obtained from each of the accumulated fragments and the position accumulated in association with each of the accumulated fragments. Restore unit to restore data,
A distribution system comprising: a completion transmission unit that transmits a completion message designating a data identification name of the desired data to the server device when the desired data is restored. A server device communicably connected to a plurality of terminal devices,
A storage unit for storing connection information for specifying a terminal identification name and a data identification name;
A request receiving unit for receiving a request message designating a data identification name from any of the plurality of terminal devices;
When the request message is received, the connection information specifying the terminal identification name of the terminal device that is the transmission source of the request message and the data identification name specified in the request message is added to the storage unit Part,
While the connection information is stored in the storage unit, the data identification name specified for each of the stored connection information is obtained without duplication, and the data is obtained for each data identification name obtained without duplication. An acquisition unit that acquires a fragment obtained by dividing data associated with an identification name in a predetermined cyclic order;
When the fragment is acquired, the fragment message that specifies the fragment and the position where the fragment is located in the data that is the source of the fragment, and the connection that caused the fragment to be acquired A fragment transmitter for transmitting to each of the terminal devices having the terminal identification name specified in the information;
A completion receiving unit for receiving a completion message designating a data identification name from any of the plurality of terminal devices;
When the completion message is received, the connection information in which the terminal identification name of the terminal device that is the transmission source of the completion message and the data identification name specified in the request message are deleted from the storage unit The server apparatus characterized by including the deletion part to perform. The server device according to claim 2,
The request receiving unit and the completion receiving unit respectively receive the request message and the completion message by a connection type protocol,
The fragment transmission unit transmits the fragment message by a connectionless protocol. The server device according to claim 3,
The connection type protocol is TCP (Transmission Control Protocol),
The server device, wherein the connectionless protocol is UDP (User Datagram Protocol). The server device according to any one of claims 2 to 4,
A connection receiver for receiving a connection message from any of the plurality of terminal devices;
The deletion unit, for each of the connection information stored in the storage unit, when a connection message transmitted from a terminal device having a terminal identification name connected to the connection information is not received for a predetermined threshold time or more, The server apparatus, wherein the connection information is deleted from the storage unit. A terminal device communicably connected to a server device,
A request transmission unit for transmitting a request message for designating a data identification name of desired data to the server device;
A fragment receiver for receiving a fragment message from the server device until the desired data is restored;
An accumulation unit that accumulates the fragment specified in the received fragment message and the position where the fragment is arranged in the desired data in association with each other;
When all the fragments obtained by dividing the desired data are accumulated, each desired fragment is obtained from each of the accumulated fragments and the position accumulated in association with each of the accumulated fragments. Restore unit to restore data,
A terminal device comprising: a completion transmission unit that transmits a completion message designating a data identification name of the desired data to the server device when the desired data is restored. The terminal device according to claim 6,
A terminal device further comprising: a connection transmission unit that transmits a connection message to the server device at a predetermined time interval after transmitting the request message until the desired data is restored. The server device is a service method to be executed, and the server device includes a storage unit, a request reception unit, an addition unit, an acquisition unit, a fragment transmission unit, a completion reception unit, and a deletion unit,
The storage unit stores connection information for specifying a terminal identification name and a data identification name,
A request receiving step for receiving a request message for designating a data identification name from any of a plurality of terminal devices;
When the adding unit receives the request message, the storage unit specifies connection information that specifies a terminal identification name of a terminal device that is a transmission source of the request message and a data identification name specified in the request message. Additional steps to add to,
While the connection information is stored in the storage unit, the acquisition unit acquires the data identification name specified for each of the stored connection information without duplication, and for each data identification name acquired without duplication An acquisition step of acquiring a fragment obtained by dividing the data associated with the data identification name in a predetermined cyclic order;
When the fragment transmission unit acquires the fragment, the fragment transmission unit acquires a fragment message that specifies the fragment and the position where the fragment is located in the data of the fragment source. Fragment transmission step for transmitting to each of the terminal devices having the terminal identification name specified in the connection information that has caused,
A completion receiving step of receiving a completion message designating a data identification name from any of the plurality of terminal devices;
When the completion message is received by the deletion unit, the connection information in which the terminal identification name of the terminal device that is the transmission source of the completion message and the data identification name specified in the request message are specified, A service method comprising a deletion step of deleting from a storage unit. A terminal method executed by a terminal device that is communicably connected to a server device, wherein the terminal device includes a request transmission unit, a fragment reception unit, a storage unit, a restoration unit, and a completion transmission unit,
A request transmitting step for transmitting a request message for designating a data identification name of desired data to the server device;
A fragment receiving step for receiving a fragment message from the server device until the desired data is restored;
An accumulating step in which the accumulating unit accumulates the fragment specified in the received fragment message and the position where the fragment is arranged in the desired data in association with each other;
When all the fragments obtained by the restoration unit dividing the desired data are accumulated, each of the accumulated fragments, the position accumulated in association with each of the accumulated fragments, A restoring process for restoring the desired data;
And a completion transmitting step of transmitting a completion message designating a data identification name of the desired data to the server device when the desired data is restored. A program that causes a computer to function as a server device that is communicably connected to a plurality of terminal devices, wherein the program stores connection information in which the terminal identification name and data identification name are designated. Memory part,
A request receiving unit for receiving a request message designating a data identification name from any of the plurality of terminal devices;
When the request message is received, the connection information specifying the terminal identification name of the terminal device that is the transmission source of the request message and the data identification name specified in the request message is added to the storage unit Part,
While the connection information is stored in the storage unit, the data identification name specified for each of the stored connection information is obtained without duplication, and the data is obtained for each data identification name obtained without duplication. An acquisition unit that acquires a fragment obtained by dividing data associated with an identification name in a predetermined cyclic order;
When the fragment is acquired, the fragment message that specifies the fragment and the position where the fragment is located in the data that is the source of the fragment, and the connection that caused the fragment to be acquired A fragment transmitter for transmitting to each of the terminal devices having the terminal identification name specified in the information;
A completion receiving unit for receiving a completion message designating a data identification name from any of the plurality of terminal devices;
When the completion message is received, the connection information in which the terminal identification name of the terminal device that is the transmission source of the completion message and the data identification name specified in the request message are deleted from the storage unit A program characterized by causing it to function as a deleting unit. A program that causes a computer to function as a terminal device that is communicably connected to a server device, wherein the program sends a request message that specifies a data identification name of desired data to the server device. Transmitter,
A fragment receiver for receiving a fragment message from the server device until the desired data is restored;
An accumulation unit that accumulates the fragment specified in the received fragment message and the position where the fragment is arranged in the desired data in association with each other;
When all the fragments obtained by dividing the desired data are accumulated, each desired fragment is obtained from each of the accumulated fragments and the position accumulated in association with each of the accumulated fragments. Restore unit to restore data,
When the desired data is restored, the program causes the server device to function as a completion transmission unit that transmits a completion message designating a data identification name of the desired data.

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