JP2010181929A - Communication system, proxy device, and update notification method for content - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent such a special function for notifying a proxy device of the change information of content from being added to a server device. <P>SOLUTION: The communication system includes: a server device 10; a proxy device 20; and terminal equipment 30 capable of communicating through the proxy device 20 with the server device 10. The server device 10 includes a change designation file 16 showing the change situations of content. The proxy device 20 includes: a change designation file obtaining part 23 for obtaining the change instruction file 16 by performing access to the server device 10; a change designation file analyzing part 25 for detecting the change of the content based on the change instruction file 16 obtained by the change instruction file obtaining part 23; and a change designation information notification part 27 for, when the change of content is detected by the change designation file analyzing part 25, notifying the terminal equipment 30 of the change designation information designating the change content of the content. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a communication system, a proxy device, and a content update notification method.

  A server device capable of transmitting content in response to a request from a user, a proxy device capable of communicating with the server device via a network (communication network) such as the Internet, and a terminal device capable of communicating with the server device via the proxy device In the communication system configured by the above, a technology is known in which the server device notifies the proxy device of the change content when the content content is changed (see, for example, Patent Document 1).

JP 2003-157259 A

However, the technique disclosed in Patent Document 1 has a problem that the configuration of the server apparatus becomes complicated because it is necessary to add a special function of notifying the proxy apparatus of content change information to the server apparatus. .
In view of the above circumstances, the present invention has a problem of notifying the user that the content has been changed without adding a special function to the server device such as notifying the proxy device of content change information. It aims to solve.

In order to solve the above problems, a communication system according to the present invention includes a server device capable of transmitting content in response to a request, a proxy device capable of communicating with the server device via a network, and a server via the proxy device. A terminal device capable of communicating with the device, the server device has a change specification file indicating a change status of the content, and the proxy device obtains the change specification file by accessing the server device and acquiring the change specification file A change specification file analysis unit that detects a change in content based on the change specification file acquired by the change specification file acquisition unit, and a change specification file analysis unit, A change specification information notifying unit for notifying the terminal device of change specification information for specifying the change content.
The “change designation information” may be information including change content information indicating the change content and content identification information for identifying the changed content.

  In this configuration, the proxy device acquires the change designation file from the server device. Therefore, there is an advantage that it is not necessary to add a special function of notifying the proxy device of content change information to the server device.

  As an aspect of the communication system according to the present invention, the proxy device includes an access history storage unit that stores access history information indicating what content the terminal device has accessed via the proxy device, and the change designation file acquisition unit includes: The change designation file is acquired based on the access history information stored in the access history storage unit. In this configuration, the proxy device can narrow down the content whose change status should be monitored by acquiring the change designation file of the content that the terminal device has accessed based on the access history information. Therefore, there is an advantage that the amount of communication can be reduced as compared with a mode in which change specification files of all contents are acquired.

As an aspect of the communication system according to the present invention, a plurality of terminal devices are connected to the proxy device,
The access history information includes content identification information for identifying the accessed content, terminal identification information for identifying the terminal device that has accessed the content, and time information indicating the time at which the content was accessed. It consists of a set of unit data. According to this configuration, the proxy device can accurately grasp which terminal device accessed which content when, based on the access history information.

  As an aspect of the communication system according to the present invention, the change designation file analyzing unit should notify the change designation information based on the contents of the change designation file and the access history information stored in the access history storage unit. If the change specification file analysis unit determines that there is a terminal device that should be notified of the change specification information, the change specification information notification unit notifies the terminal device of the change specification information. To do. In this configuration, when a change in content is detected from the content of the acquired change designation file, the proxy device is based on the content of the change designation file and the access history information stored in the access history storage unit. Since it is determined whether or not there is a terminal device that should be notified of the change designation information, and only when it is determined that there is a terminal device that should be notified of the change designation information, the change designation information is notified to the terminal device. When the change is detected, there is an advantage that the communication amount can be reduced as compared with the mode in which the change designation information is uniformly notified to all the terminal devices.

  As an aspect of the communication system according to the present invention, a terminal device caches content accessed via a proxy device, a change designation information receiving unit that receives change designation information transmitted from the proxy device, The change specification information analyzing unit that analyzes whether the change specification information received by the change specification information receiving unit indicates content update or stoppage, and the change specification information is analyzed by the change specification information analysis unit. If the content is cached in the cache unit, the content indicated to have been updated with the change designation information is updated. If it is confirmed that the content is suspended, the content of the content cached in the cache Further comprising at specified information and update / stop processing unit that performs a process of prohibiting the use of the content has been shown to have been stopped, the. Here, “content stopped” means a state where the content cannot be used, and includes, for example, a case where the content is deleted or a state where access to the content is prohibited.

  The proxy device according to the present invention is a proxy device that relays communication between a server device capable of transmitting content in response to a request and a terminal device, and accesses the server device to check the change status of the content. A change specification file acquisition unit that acquires the change specification file shown, a change specification file analysis unit that detects a change in content based on the contents of the change specification file acquired by the change specification file acquisition unit, and a change specification file analysis unit And a change designation information notifying unit for notifying the terminal device of change designation information for designating the change contents of the content when a change in the content is detected. In this configuration, since the proxy device acquires the change designation file indicating the change status of the content by accessing the server device, the server device is provided with a special function of notifying the proxy device of the content change information. In addition, the proxy device has an advantage that it can acquire content change information.

  As an aspect of the proxy device according to the present invention, the proxy device further includes an access history storage unit that stores access history information indicating what content the terminal device has accessed via the proxy device, and the change designation file acquisition unit includes an access history A change designation file is acquired based on the access history information stored in the storage unit.

  Further, as an aspect of the proxy device according to the present invention, a plurality of terminal devices are connected to the proxy device, and the access history information includes content identification information for identifying accessed content, and a terminal device that has accessed the content. Is composed of a set of unit data consisting of terminal identification information for identifying the content and time information indicating the time when the content is accessed.

  Furthermore, as an aspect of the proxy device according to the present invention, the change designation file analysis unit should notify the change designation information based on the contents of the change designation file and the access history information stored in the access history storage unit. It is determined whether or not there is a terminal device, and the change designation information notifying unit determines that there is a terminal device to which the change designation file analysis unit should notify the change designation information. To be notified.

  The terminal device according to the present invention is a terminal device that can communicate with the server device via the proxy device described above, and a cache unit that caches content accessed via the proxy device, and the proxy device transmits the content. Change specification information analysis unit that analyzes whether the change specification information received by the change specification information reception unit and the change specification information received by the change specification information reception unit indicate content update or stop And the change specification information analysis unit confirm that the change specification information indicates an update of the content, it is updated with the change specification information among the contents cached in the cache unit. While updating the indicated content, if it is confirmed that the change designation information indicates that the content has been stopped, And an update / stop processing unit that performs a process of prohibiting the use of the content to indicate that it is stopped at the change designation information of the cached content to the shoe portion.

  In addition, as a content update notification method according to the present invention, a proxy device that relays communication between a server device and a terminal device that can transmit content in response to a request can access the server device to change the content. The change designation file indicating the change content is detected, and when the change of the content is detected based on the change designation file, and the change of the content is detected, the change designation information designating the change content of the content is notified to the terminal device.

It is a figure which shows schematic structure of the communication system which concerns on this embodiment. It is a flowchart which shows operation | movement of the proxy apparatus which concerns on the same embodiment. It is a figure which shows the specific content of the access history information which concerns on the embodiment. It is a figure which shows the specific content of the change designation | designated file which concerns on the embodiment. It is a flowchart which shows operation | movement of the terminal device which concerns on the same embodiment.

<1. Embodiment>
FIG. 1 is a diagram illustrating a schematic configuration of a communication system 100 according to the present embodiment. As shown in FIG. 1, a communication system 100 includes a plurality of server devices 10 each capable of transmitting content in response to a request, and a proxy device 20 capable of communicating with each server device 10 via a network 200 such as the Internet. , Each of which includes a plurality of terminal devices 30 that can communicate with each server device 10 via the proxy device 20.

  Each of the plurality of server devices 10 includes a communication unit 12 for transmitting / receiving data to / from the proxy device 20, a content database 14 in which contents such as documents and distribution videos are stored, and content stored in the content database 14 And a change designation file 16 indicating the change status of the file. In the present embodiment, when the content is changed, the creator of the content creates the change specification file 16 of the content and uploads the change specification file 16 onto the server device 10.

  The proxy device 20 includes a communication unit 21 for transmitting / receiving data to / from the server device 10 and the terminal device 30, a change specification file acquisition unit 23 for acquiring the change specification file 16 from the server device 10, and a change specification. When a change specification file analysis unit 25 that detects a change in content based on the change specification file 16 acquired by the file acquisition unit 23 and a change specification file analysis unit 25 detects a change in content, A change specification information notifying unit 27 for notifying the terminal device 30 of change specification information for specifying a change content, and an access history storage for storing access history information indicating what content the terminal device 30 has accessed via the proxy device 20 Unit 29.

  Each of the plurality of terminal devices 30 includes a communication unit 31 for transmitting / receiving data to / from the proxy device 20, a change designation information receiving unit 33 for receiving change designation information transmitted from the proxy device 20, and a change designation. Accessed via the proxy device 20, the change designation information analysis unit 35 for analyzing the change designation information received by the information receiving unit 33, the update / stop processing unit 37 that performs processing according to the contents of the change designation information And a cache unit 39 that caches content that may occur. The communication unit 31 of the terminal device 30 in the present embodiment performs communication based on HTTP (Hypertext Transfer Protocol) with the server device 10 via the proxy device 20. In the present embodiment, each of the plurality of terminal devices 30 is connected to the proxy device 20 via a LAN (Local Area Network).

  Next, the operation of the proxy device 20 according to the present embodiment will be described with reference to FIGS. FIG. 2 is a flowchart showing a specific operation of the proxy device 20. As shown in FIG. 2, first, the proxy device 20 acquires the change designation file 16 from the server device 10 (step S1). For example, the proxy device 20 may access the server device 10 at a predetermined cycle, or the proxy device 20 monitors its own processing load, and when the processing load becomes a predetermined amount or less, the server device 20 You may access In the present embodiment, the change specification file acquisition unit 23 in the proxy device 20 determines which server device 10 should store the change specification file 16 stored based on the access history information stored in the access history storage unit 29. The change designation file 16 is acquired. The specific contents will be described below.

  FIG. 3 is a diagram illustrating an example of access history information stored in the access history storage unit 29. As shown in FIG. 3, the access history information includes content identification information for identifying the accessed content, terminal identification information for identifying the terminal device 30 that has accessed the content, and the content that has been accessed. It consists of a set of unit data J associated with time information indicating time. By referring to the access history information shown in FIG. 3, the change designation file acquisition unit 23 can accurately grasp which terminal device 30 accessed which content and when.

  Here, for example, when the content identification information is represented by “http://www.example.com/aaa.png”, the first half of “http://www.example.com/” The information for specifying the server device 10 in which the content is stored (the domain of the server device 10) is shown, and the portion “aaa.png” which is the latter half shows the file name of the content.

  The change designation file acquisition unit 23 acquires the change designation file 16 based on the access history information shown in FIG. More specifically, the change specification file acquisition unit 23 determines to acquire the change specification file 16 stored in the server device 10 specified by the content identification information included in the access history information, and the change specification file 16 is acquired. In the present embodiment, it is determined to acquire the change specification file 16 stored in the server device 10 whose domain is “http://www.example.com/”, and the change specification file 16 is transmitted via the communication unit 21. 16 is acquired. For example, “http://www.example.com/update.txt” in which “update.txt” indicating the file name of the change specification file 16 is connected to the domain “http://www.example.com/”. The change designation file 16 can be acquired using the URL (Uniform Resource Locator). Note that the file name of the change specification file 16 need not be limited to the above as long as the content creator who prepares the change specification file 16 and the proxy device 20 are consistent.

  Returning to FIG. 2 again, the description will be continued. Next, the proxy device 20 detects a content change based on the acquired change designation file 16 (step S2). In the present embodiment, the change specification file analysis unit 25 in the proxy device 20 detects a change in content based on the content of the change specification file 16 acquired by the change specification file acquisition unit 23. The specific contents will be described below.

  FIG. 4 is a diagram showing the contents of the change specification file 16 acquired by the change specification file acquisition unit 23 and stored in the server device 10 whose domain is “http://www.example.com”. As shown in FIG. 4, the change designation file 16 includes content identification information, time information indicating the time when the content of the content specified by the content identification information is changed, change content information indicating the type of change content, Are composed of a set of unit data K associated with.

  In FIG. 4, "http://www.example.com/aaa.png", "http://www.example.com/bbb.png" and "http://www.example.com/ccc.png The content identified by "" is "updated" on March 1, 2008 at 1: 1: 1.01, and the content identified by "http://www.example.com/ddd.png" "Updated" on December 1 at 1: 1: 1 and the content identified by "http://www.example.com/eee.png" will be at 1: 1: 01: 01 on December 1, 2008 It has been shown to have been “stopped”. Here, “stop” indicates a state in which the content cannot be used. For example, the content is deleted or access to the content is prohibited. To do. As can be understood from FIG. 4, in the present embodiment, the change designation file analysis unit 25 detects changes (updates or stops) of five contents included in the change designation file 16.

  As shown in FIG. 2, when the result of step S2 is affirmative, the proxy device 20 determines whether there is a terminal device 30 that should be notified of change designation information (step S3). In the present embodiment, the change specification file analysis unit 25 in the proxy device 20 includes the contents of the change specification file acquired by the change specification file acquisition unit 23 and the access history storage information stored in the access history storage unit 29. Based on this, it is determined whether there is a terminal device 30 to which change designation information is to be notified. The specific contents will be described below.

Referring to FIGS. 3 and 4, the terminal device 30 indicated by the terminal identification information “090-AAAA-AAAA” has the content indicated by the content identification information “http://www.example.com/aaa.png”. On the other hand, since the access is made after the content is updated, the updated content is already cached in the cache unit 39.
Therefore, the change specification file analysis unit 25 sets the change specification information indicating that the content indicated by “http://www.example.com/aaa.png” has been “updated” as “090-AAAA-AAAA”. It is determined that there is no need to notify the terminal device 30 shown.
Similarly, the change designation information indicating that the content indicated by the content identification information “http://www.example.com/bbb.png” is “updated” is indicated by the terminal identification information “090-BBBB-BBBB”. It is determined that there is no need to notify the terminal device 30 to be notified.

On the other hand, the content indicated by the content identification information “http://www.example.com/ddd.png” is updated after the terminal device 30 indicated by the terminal identification information “090-AAAA-AAAA” accesses it. Therefore, the updated content is not cached in the cache unit 39 of the terminal device 30.
Therefore, the change specification file analysis unit 25 sets the change specification information indicating that the content indicated by “http://www.example.com/ddd.png” has been “updated” as “090-AAAA-AAAA”. It is determined that the terminal device 30 shown should be notified.
Further, the content indicated by the content identification information “http://www.example.com/eee.png” is stopped after the terminal device 30 indicated by the terminal identification information “090-BBBB-BBBB” has accessed. Therefore, the fact that the content is stopped is not reflected in the data cached in the cache unit 39 of the terminal device 30.
Therefore, the change specification file analysis unit 25 sets “090-BBBB-BBBB” as the change specification information indicating that the content indicated by “http://www.example.com/eee.png” has been “stopped”. It is determined that the terminal device 30 shown should be notified.
Here, the change designation information includes content identification information of the content where the change is detected and change content information indicating the change content.

  As described above, in the present embodiment, the change designation file analysis unit 25 identifies the terminal device 30 to which the change designation information is to be notified, and sends the terminal designation information for designating the terminal device 30 to the change designation information notification unit 27.

As shown in FIG. 2, when the result of step S3 is affirmative, the proxy device 20 notifies the change designation information to the terminal device 30 that should notify the change designation information (step S4). In the present embodiment, the change designation information notification unit 27 notifies the change designation information to the terminal device 30 specified by the terminal designation information sent from the change designation file analysis unit 25.
Specifically, the change designation information notifying unit 27 changes the change designation information indicating that the content indicated by “http://www.example.com/ddd.png” has been “updated” to “090-AAAA”. -AAA "is notified to the terminal device 30, and change designation information indicating that the content indicated by" http://www.example.com/eee.png "has been" stopped " The communication unit 21 is controlled to notify the terminal device 30 indicated by “BBBB-BBBB”.

  Next, the operation of the terminal device 30 at this time will be described with reference to FIG. FIG. 5 is a flowchart showing a specific operation of the terminal device 30 in the present embodiment. As shown in FIG. 5, first, the terminal device 30 receives change designation information (step S1). In the present embodiment, the change designation information receiving unit 33 in the terminal device 30 receives the change designation information transmitted from the change designation information notifying unit 27 in the proxy device 20 via the communication unit 31.

  Next, the terminal device 30 analyzes the contents of the change designation information (step S2). In the present embodiment, the change designation information analysis unit 35 in the terminal device 30 determines whether the change designation information received by the change designation information receiving unit 33 indicates “update” or “stop”. To analyze. In the present embodiment, the change designation information analysis unit 35 in the terminal device 30 indicated by the terminal identification information “090-AAAA-AAAA” indicates that the change designation information received by the change designation information receiving unit 33 in the terminal device 30 is In the terminal device 30 indicated by “090-BBBB-BBBB”, it is confirmed that it indicates “update” of the content indicated by the content identification information “http://www.example.com/ddd.png”. The change designation information analysis unit 35 displays “stop” of the content indicated by “http://www.example.com/eee.png” as the change designation information received by the change designation information receiving unit 33 in the terminal device 30. Is confirmed.

When the received change designation information indicates “update”, the change designation information analysis unit 35 performs an “update” process with the content identification information included in the change designation information so as to perform an “update” process. (Step S3). In the present embodiment, the change designation information analysis unit 35 in the terminal device 30 indicated by “090-AAAA-AAAA” includes the content identification information “http://www.example.com/ddd.png” and the content. For example, the update / stop processing unit 37 is instructed to “update” the content specified by the identification information. Receiving the instruction, the update / stop processing unit 37 checks whether the target content exists in the cache unit 39 (step S4). If the result of step S4 is affirmative, the update / stop processing unit 37 reacquires the content and updates the content of the cache unit 39 (step S5).
In the present embodiment, when the result of step S4 is affirmative, the update / stop processing unit 37 in the terminal device 30 indicated by “090-AAAA-AAAA” is “http://www.example.com/ddd. The communication unit 31 is controlled to request the server device 10 to transmit the content indicated by “png”. Then, the content indicated by “http://www.example.com/ddd.png” is transmitted from the server device 10 to the terminal device 30 via the proxy device 20, and the latest content of the content is cached 39. So that it is cached. If the result of step S4 is negative, the process ends without doing anything.

On the other hand, when the received change designation information indicates “stop”, the change designation information analysis unit 35 performs update / stop processing so as to perform “stop” processing together with the content identification information included in the change designation information. The unit 37 is instructed (step S6).
In the present embodiment, the change designation information analysis unit 35 in the terminal device 30 indicated by “090-BBBB-BBBB” includes the content identification information “http://www.example.com/eee.png” and the content. For example, the update / stop processing unit 37 is instructed to “stop” the content specified by the identification information. Receiving the instruction, the update / stop processing unit 37 checks whether the target content exists in the cache unit 39 (step S7). If the result of step S7 is affirmative, the update / stop processing unit 37 prohibits the use of the target content in the cache unit 39 (step S8).
In this embodiment, when the result of step S7 is affirmative, the update / stop processing unit 37 in the terminal device 30 indicated by “090-BBBB-BBBB” indicates “ By deleting the content indicated by “http://www.example.com/eee.png”, the use of the content is prohibited. If the result of step S4 is negative, the process ends without doing anything.

  As described above, in the present embodiment, the server device 10 has the change specification file 16 indicating the content change status, and the proxy device 20 obtains the change specification file 16 by accessing the server device 10. Therefore, the server device 10 does not need to notify the proxy device of content change information. Therefore, there is an advantage that it is not necessary to add a special function of notifying the proxy device of content change information to the server device 10. Further, according to the present embodiment, there is an advantage that it is not necessary to add a function for monitoring a change state of content and a function for creating change information to the server device.

Moreover, instead of the plurality of terminal devices 30, one proxy device 20 represents the change designation file 16 as a representative, thereby greatly reducing the total number of HTTP processes required for obtaining the change designation file 16 in the entire system. be able to. Further, it is not necessary for the terminal device 30 to perform useless HTTP processing by spending valuable communication costs.
Further, as described above, the proxy device 20 acquires the change designation file 16 at a predetermined cycle. If the operation cycle is set to a sufficiently short cycle, the change state of the content can be detected at a sufficiently early stage. Can do.

  In the present embodiment, the proxy device 20 determines the content for which the change designation file 16 is to be acquired based on the access history information, and acquires the change designation file 16 for the content. Therefore, the change status should be monitored. Content can be narrowed down. Therefore, there is an advantage that the communication amount can be reduced as compared with the aspect in which the change designation file 16 of all contents is acquired.

  Furthermore, in the present embodiment, when a change in content is detected from the content of the acquired change designation file 16, the proxy device 20 stores the content of the change designation file 16 and the access history storage unit 29. Based on the access history information, it is determined whether there is a terminal device 30 that should be notified of change designation information, and only when it is determined that there is a terminal device 30 that should be notified of change designation information, the terminal device 30 concerned. Since the change designation information is notified, there is an advantage that the communication amount can be reduced as compared with the aspect in which the change designation information is uniformly notified to all the terminal devices 30 when the change of the content is detected.

  The proxy device 20 described above may be configured by a computer device including a CPU, a communication unit 21, RAM, ROM, and a hard disk. In this case, the CPU executes the above-described 23, 25, and 27 by expanding and executing the program stored in the hard disk on the RAM. In this case, the flowchart described with reference to FIG. 2 shows the operation contents of the CPU.

<2. Modification>
The present invention is not limited to the above-described embodiments, and for example, the following modifications are possible. Also, two or more of the modifications shown below can be combined.

(1) Modification 1
In the above-described embodiment, an aspect in which a plurality of server devices 10 are provided is illustrated, but the number of server devices 10 is arbitrary. For example, only one server device 10 may be provided. Similarly, the number of terminal devices 30 is also arbitrary. Further, the type and number of contents stored in the content database 14 of the server device 10 are also arbitrary. For example, a mode in which only one type of content is stored in the content database 14 may be used, or a mode in which a plurality of types or one type of content is stored in the content database 14 may be used.

(2) Modification 2
In the above-described embodiment, when the content is changed, the creator of the content creates the change specification file 16 of the content and uploads the change specification file 16 on the server device 10. Not limited to this, when the contents are updated, the change designation file 16 of the contents can be automatically created. For example, the server device 10 may monitor the change status of the content stored in the content database 14 and automatically create the change specification file 16 for the content when the content is changed.

(3) Modification 3
In the above-described embodiment, the change specification file acquisition unit 23 in the proxy device 20 acquires the content change specification file 16 stored in which server device 10 based on the access history information stored in the access history storage unit 29. Although it is determined whether or not to determine, the determination method is arbitrary. For example, it is possible to determine to preferentially acquire the change designation file 16 of the frequently accessed content, and the content designated by the user using the terminal device 30 is marked, It is also possible to determine to acquire the change designation file 16 of the content with the marking.

(4) Modification 4
In the above-described embodiment, when the change designation information transmitted from the proxy device 20 indicates “stop”, the update / stop processing unit 37 in the terminal device 30 stores the content of the cache unit 39 of the terminal device 30. Of these, the content indicated as “stopped” by the change designation information is deleted. However, the present invention is not limited to this, and any method for prohibiting the use of the content is arbitrary. For example, it is possible to mark the content indicating that “changed” is “stopped” among the contents of the cache unit 39 by marking that the content is unavailable and prohibit the use of the content.

(5) Modification 5
In the above-described embodiment, when a change in content is detected from the content of the acquired change designation file 16, the proxy device 20 and the content of the change designation file 16 and the access history stored in the access history storage unit 29. From the information, it is detected that there is a terminal device 30 that should be notified of the change specification information, and the change specification information is notified to the terminal device 30 only when it is detected that there is a terminal device 30 that should be notified of the change specification information. However, the present invention is not limited to this. For example, when a change in content is detected from the content of the obtained change designation file 16, the proxy device 20 designates the content of the content change. An aspect of notifying the change designation information to all the terminal devices 30 may be possible.

DESCRIPTION OF SYMBOLS 10 ... Server apparatus, 12 ... Communication part, 14 ... Content database, 16 ... Change specification file, 20 ... Proxy apparatus, 21 ... Communication part, 23 ... Change specification file acquisition part, 25 ... Change Designated file analysis unit, 27 …… Change designation information notification unit, 29 …… Access history information storage unit, 30 …… Terminal device, 31 …… Communication unit, 33 …… Change designation information reception unit, 35 …… Change designation information Analysis unit, 37... Update / stop processing unit, 39... Cache unit, 100 .. communication system, 200 .. network, J, K .. unit data.

Claims (11)

A server device capable of transmitting content in response to a request;
A proxy device capable of communicating with the server device via a network;
A terminal device capable of communicating with the server device via the proxy device,
The server device has a change designation file indicating a change status of the content,
The proxy device is:
A change specification file acquisition unit for accessing the server device and acquiring the change specification file;
A change specification file analysis unit that detects a change in the content based on the change specification file acquired by the change specification file acquisition unit;
A change designation information notifying unit for notifying the terminal device of change designation information for designating a change content of the content when the change designation file analysis unit detects a change in the content;
Communications system. The proxy device includes an access history storage unit that stores access history information indicating which content the terminal device has accessed via the proxy device,
The change designation file acquisition unit acquires the change designation file based on the access history information stored in the access history storage unit.
The communication system according to claim 1. A plurality of the terminal devices are connected to the proxy device,
The access history information includes content identification information for identifying the accessed content, terminal identification information for identifying the terminal device that has accessed the content, and time information indicating the time at which the content was accessed. Consisting of a set of unit data consisting of
The communication system according to claim 2. The change designation file analysis unit determines whether there is a terminal device to which the change designation information is to be notified based on the contents of the change designation file and the access history information stored in the access history storage unit. Judging
When the change designation information notifying unit determines that there is a terminal device that should notify the change designation information in the change designation file analyzing unit, the change designation information notifying unit notifies the terminal device of the change designation information.
The communication system according to claim 3. The terminal device
A cache unit that caches content accessed through the proxy device;
A change designation information receiving unit for receiving the change designation information transmitted from the proxy device;
A change designation information analysis unit that analyzes whether the change designation information received by the change designation information receiving unit indicates content update or stop;
If it is confirmed in the change designation information analysis unit that the change designation information indicates content update, it is updated with the change designation information among the contents cached in the cache unit. While updating the indicated content,
When it is confirmed that the change designation information indicates that the content has been stopped, use of the content indicated by the change designation information among the contents cached in the cache unit is prohibited. An update / stop processing unit for performing processing to be performed,
The communication system according to any one of claims 1 to 4. A proxy device that relays communication between a server device and a terminal device capable of transmitting content in response to a request,
A change specification file acquisition unit that accesses the server device and acquires a change specification file indicating a change status of the content;
A change specification file analysis unit for detecting a change in the content based on the content of the change specification file acquired by the change specification file acquisition unit;
A change designation information notifying unit for notifying the terminal device of change designation information for designating a change content of the content when the change designation file analysis unit detects a change in the content;
Proxy device. An access history storage unit for storing access history information indicating which content the terminal device has accessed via the proxy device;
The change designation file acquisition unit acquires the change designation file based on the access history information stored in the access history storage unit.
The proxy device according to claim 6. A plurality of the terminal devices are connected to the proxy device,
The access history information includes content identification information for identifying the accessed content, terminal identification information for identifying the terminal device that has accessed the content, and time information indicating the time at which the content was accessed. Consisting of a set of unit data consisting of
The proxy device according to claim 7. The change designation file analysis unit determines whether there is a terminal device to which the change designation information is to be notified based on the contents of the change designation file and the access history information stored in the access history storage unit. Judging
When the change designation information notifying unit determines that there is a terminal device that should notify the change designation information in the change designation file analyzing unit, the change designation information notifying unit notifies the terminal device of the change designation information.
The proxy device according to claim 8. A terminal device capable of communicating with the server device via the proxy device according to claim 6,
A cache unit that caches content accessed through the proxy device;
A change designation information receiving unit for receiving the change designation information transmitted from the proxy device;
A change designation information analysis unit that analyzes whether the change designation information received by the change designation information receiving unit indicates content update or stop;
If it is confirmed in the change designation information analysis unit that the change designation information indicates content update, it is updated with the change designation information among the contents cached in the cache unit. While updating the indicated content,
When it is confirmed that the change designation information indicates that the content has been stopped, use of the content indicated by the change designation information among the contents cached in the cache unit is prohibited. An update / stop processing unit for performing processing to be performed,
Terminal device. A proxy device that relays communication between a server device and a terminal device capable of transmitting content in response to a request acquires a change designation file indicating the change status of the content by accessing the server device, and the change When the change of the content is detected based on the designated file and the change of the content is detected, the change designation information for designating the change content of the content is notified to the terminal device.
Content update notification method.

Images