JP2010511222A - Peer management server and peer management method in P2P system - Google Patents

Abstract

The present invention relates to a peer management server in a P2P system. The peer management server of the present invention sets up a connection with a peer connected to a P2P system, receives a message from the peer, and generates a query name and parameters corresponding to the received message for message processing. An SQL map process processing unit for outputting a query statement corresponding to the query name and parameters received from the front end process processing unit, including mapping information for mapping the query name and parameters to a query statement; And a peer database that holds peer information that operates as an active peer and content information that each peer holds, and that updates or extracts data according to the query statement output from the SQL map process processing unit.

Description

  The present invention relates to a peer management server of a P2P system, and more particularly, to a peer management server and a peer management method for providing peer information for sending and receiving files between peers.

  The P2P system is a communication system in which all participants become suppliers and consumers by directly connecting and searching between personal computers (peers) apart from the existing client server concept.

  Such a P2P system was first tested for sharing music files by services such as “Napster” in the US and “Soribada” in Korea. It is used by various services rather than sharing music files.

  For example, the P2P system is used for exchanging game packets between clients in a game system, and is also used as a means for a content provider to reduce the load on the server.

  Such a P2P system should provide peer information in order to connect individual clients, and a P2P service provider manages peer information connected to the P2P system using a peer management server.

  In the conventional case, peer information connected to the P2P system is generally managed by a data structure of a tree structure (Data Structure). FIG. 1 is a diagram showing a data structure of a tree structure for managing conventional peer information.

  As shown in FIG. 1, conventionally, peer information connected by a tree structure list in which a parent node and a child node are organically linked is managed, and the peer information is updated by an algorithm for processing connection and release of peers. .

  In this way, when the connected peer information is managed by the data structure, there is a problem that a part of the connected peer information is lost. By managing the peer information by the data structure instead of the database, the memory space of the server is reduced. There was a problem of occupying too much.

  In particular, when the peer information to be managed increases, the memory space of the server is limited, so it is not effective to manage the peer information by the data structure.

  Conventionally, only static information such as user IDs and personal information is managed by the database. However, in order to process peer information more efficiently, peer information management in the database and effective peers in the database are performed. A server process for information management is required.

  The present invention proposes a peer management server and method in a P2P system that can efficiently manage peer information connected to the P2P system using a database in order to solve the above-described problems of the prior art.

  Another object of the present invention is to propose a peer management server and a method thereof in a P2P system in which generation and disappearance of a front-end process and an SQL map process can be controlled according to the state of the peer management server.

  Another object of the present invention is to propose a peer management server and its method in a P2P system capable of dualizing database management and client message processing.

  Another object of the present invention is to propose a peer management server and method in a P2P system that allows a peer to operate as an active peer only when content is downloaded.

  In order to achieve the above object, according to one aspect of the present invention, a connection is established with a peer connected to a P2P system, a message is received from the peer, and the received message is processed for message processing. A front-end process processing unit for generating a corresponding query name and parameter, mapping information for mapping the query name and parameter to a query statement, and corresponding to the query name and parameter received from the front-end process processing unit An SQL map process processing unit that outputs a query statement, and holds peer information that operates as an active peer and content information held by each peer, and updates data by the query statement output from the SQL map process processing unit, or The peer database to be extracted Pia management server in a P2P system according to claim Mukoto is provided.

  The peer management server includes a state determination unit that checks the peer connection and message processing state and the query statement generation state, and the front-end process processing unit and the state corresponding to a determination result of the state determination unit. The apparatus may further include a control unit that controls generation and disappearance of the SQL map process processing unit.

  Here, the message received from the peer includes at least one of a peer registration request message, a peer deregistration request message, and a content registration request message. The peer registration request message is a message for registering the peer as an active peer when the peer is in a download state, and the peer deregistration request message is a message indicating that the peer is an active peer when the peer is in a download complete state. It is a message for releasing from.

  At this time, the peer registration request message includes a user ID, an address, and retained content information, and the front-end process processing unit includes a query name set in advance corresponding to the peer registration request message, the user ID, and the address. And a parameter corresponding to the stored content information, and the SQL map process processing unit generates the query sentence by analyzing the query name and parameter, and extracts peer information from the peer database. .

  Note that the SQL map process processing unit stores the mapping information in the form of an XML document.

  According to another aspect of the present invention, a method for managing peer information in a P2P system includes receiving a peer registration request message from a peer connected to the P2P system, and generating a query name and parameters corresponding to the peer registration request message. Generating a query statement corresponding to the peer registration request message using mapping information for mapping the query name and parameters to the query statement, and using the query statement in the peer information database. Is registered with the active peer, and a peer information management method is provided.

  In the peer registration request message receiving step, the peer registration request message is received from the peer to register the peer with an active peer when the peer is in a download state.

  The peer management method may further include receiving a content request message from the peer, generating a query name corresponding to the content request message and a parameter for the content ID included in the content request message, and mapping information. Using a query name corresponding to the content request message and a peer selection query statement corresponding to the parameter, and peer information holding content associated with the content ID from the peer database by the peer selection query statement. The method further includes extracting and providing to the peer.

  At this time, the query name and parameter generation step and the query statement generation step are processed by a separate process, and the peer management method includes processing of the query name and parameter generation step and the query statement generation step. For this purpose, the method further comprises adjusting a resource allocation state of the P2P system.

  According to another aspect of the present invention, there is provided a recording medium on which a program for executing the above-described method is embodied and recorded in the digital data processing apparatus and readable by the digital data processing apparatus Is done.

  According to another aspect of the present invention, there is provided a recording medium recorded with an agent program incorporated in a peer connected to a P2P system so that the peer receives provision of a P2P service, the peer and the P2P system A connection setting module for setting a connection between the P2P system, a peer information receiving module for generating and transferring a content request message to the P2P system, and receiving other peer information including the content from the P2P system, the peer A peer connection setting module that downloads the content from the other peer by setting the connection with the other peer based on the other peer information received by the information receiving module; Download check module to check whether it is downloaded And an agent program including a peer registration / cancellation module that generates a peer registration request message and a peer registration cancellation request message according to the check result of the download check module and forwards them to the P2P system. A recording medium is provided.

The figure which showed an example of the data structure of the tree structure which manages the conventional peer information. The figure which showed the structure of the P2P system to which the peer management server which concerns on one embodiment of this invention is applied. The block diagram which showed the structure of the peer management server which concerns on one embodiment of this invention. The block diagram which showed the module structure of the front end server which concerns on one embodiment of this invention. The figure which showed the operation | movement structure of the SQL map process which concerns on one embodiment of this invention. The figure which showed an example of the connection structure of the SQL map process and peer database which concerns on one embodiment of this invention. The block diagram which showed the module structure of the agent program which concerns on one embodiment of this invention. The flowchart which showed the operation | movement which the user client which concerns on one embodiment of this invention requests | requires peer registration and peer deregistration. The flowchart which showed the peer registration process which concerns on one embodiment of this invention. The flowchart which showed the process which provides peer information from the peer management server which concerns on one embodiment of this invention. 6 is a flowchart illustrating a process for randomly selecting a peer having content requested by a user according to an embodiment of the present invention. The figure which showed the field structure of the peer registration request message which concerns on one embodiment of this invention.

  Hereinafter, embodiments of a peer management server according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 2 is a diagram illustrating a configuration of a P2P system to which a peer management server according to an embodiment of the present invention is applied. As shown in the figure, the P2P system according to an embodiment of the present invention includes a plurality of user clients and a peer management server 200, and a P2P agent program is installed in each user client.

  The P2P system to which the present invention is applied can be applied to various forms of P2P services. The P2P system of the present invention is applicable to a file sharing service for sharing general music and video files. The file sharing service is a service that allows a user connected to the P2P service system to check a file list owned by the user and download a specific file from a specific peer.

  In addition to such a general file sharing service, the present invention can also be used for a content transfer service using P2P. Normally, content provision in a content provider is performed using a CDN (Contents Delivery Network), but it is possible to provide content using a P2P system according to the present invention without using a CDN that requires a predetermined cost. In this case, a peer list storing content that the user wants to receive from the service provider is provided to the user who requested the content, and the user can receive content from a specific peer among the peers included in the peer list. By downloading, it is possible to provide content without using a CDN.

  In addition to the services described above, the present invention can be applied to various services that can be provided using P2P.

  Hereinafter, the present invention will be described mainly using a case where a content provider provides content requested by a user using P2P.

  User clients can include any type of device that can communicate over a network and can be driven by a P2P agent program. As a user client, devices such as a notebook computer, a PDA, and a mobile communication terminal can be used as well as a general PC.

  Each user client connected to the P2P system operates as one peer, and the terms peer and user client are used together herein.

  When specific content is requested from a user, the peer management server 200 provides peer information that can provide the requested content. For example, when a user requests a movie “Moulin Rouge”, the peer management server 200 extracts peer information that can be provided by a movie file “Moulin Rouge” and provides it to the client.

  The peer management server 200 is connected to the P2P system in order to provide peer information that can provide content requested by a user, and manages a peer list that can provide content and content information stored in each peer.

  As described above, in the conventional case, the peer management server manages the peer list connected to the P2P system and the content information stored in each peer in the form of a data structure (Data Structure). In the past, it was common to manage the peer list and the content stored in each peer in the form of a data structure in the memory, and manage only static information that does not change like the user ID in the database. . Also, when a request message such as a request for peer information is received from a user, the peer management server has executed a preset algorithm for the data structure to process the user request information.

  However, the peer management server according to an embodiment of the present invention manages the peer list connected to the P2P system and the content information stored in each peer in a database.

  According to an embodiment of the present invention, when the peer dose to be managed increases by managing the peer information in the database, the peer information can be managed in a large number of databases.

  In addition, the peer management server according to an embodiment of the present invention generates a process for processing a client connection and a message received from the client, and a database query statement in order to manage the connected peer information in the database. Operate the process independently.

  In the conventional case where peer information is managed using a data structure, client connection and message processing, and an algorithm for inserting, extracting and updating data in the data structure can only be executed by one process. Furthermore, in the past, static information was managed in a database, but a query statement for the database was also generated by the same single process. However, according to the present invention, the function performed by one process is performed by a separate process.

  A detailed description of how client connections and message processing and database query statement generation are handled by separate processes, and the advantages thereof, will be given with reference to other figures.

  The agent program installed in each user client performs peer registration through communication with the peer management server so that the user client operates as a peer in the P2P network.

  According to an embodiment of the present invention, the agent program performs peer registration and peer deregistration so that the user program operates as a peer only when a user client is downloading content from another peer.

  Conventionally, an agent program provided in a user client for P2P is generally controlled so that the user client always operates as a peer that provides content, among the operations of the user client.

  However, when the user client is set to always operate as a peer as described above, there is a problem that the resource of the user client is wasted by P2P communication. For example, the processing of the P2P connection causes a problem that other work processing performed by the user is delayed or an excessive load is generated on the CPU.

  In the present invention, in order to solve such a conventional problem, only when a user client downloads content from another peer, the user client operates as a peer that provides content to the other client.

  In addition to the above-described peer registration operation, the agent program performs a function of receiving the peer information holding the content requested by the user from the peer management server, setting the connection with the peer, and downloading the content.

  FIG. 3 is a block diagram showing a configuration of a peer management server according to a preferred embodiment of the present invention. As shown in the figure, the peer management server 200 can include a state determination unit 300, a control unit 302, a front-end process processing unit 304, an SQL map process processing unit 306, and a peer database 308.

  In FIG. 3, a front-end process processing unit 304 performs a front-end process function by taking charge of communication with an agent program installed in each peer. Here, the front-end process function includes a connection setting function with a user client and a function of processing a request message received from the user client.

  For the connection setting with the user client, the front end processing unit 304 holds the connection with the user client when the connection setting is requested from the user client. Here, the connection is a TCP connection or a UDP connection. .

  The request messages received and processed by the front-end processing unit 304 from the user client can include a peer registration request message, a peer deregistration request message, and a content request message.

  The peer registration request message is a message requesting that the peer register as an active peer that can provide content. As described above, according to an embodiment of the present invention, when a content download from another peer is detected, the agent program generates a peer registration request message and transfers it to the front end processing unit 304.

  The peer deregistration request message is a message requesting deregistration of a peer registered as an active peer. According to an embodiment of the present invention, the agent program generates a peer deregistration request message and transfers it to the front-end processing unit 304 when content download from another peer is completed.

  The content request message is a message for requesting peer information storing specific content. When the user requests download of specific content, the agent program generates a content request message including ID information of the content and transfers it to the front end processing unit 304.

  In addition to the messages described above, various types of messages can be transmitted from the peer to the front-end processing unit 304. The front-end processing unit 304 receives the message generated by the agent program, and the corresponding query name / parameter. It has the function to generate.

  In the conventional case, when receiving the above request message from the peer, the peer management server executes a function corresponding to the request to register the peer in the data of the data structure, or select the peer from the data of the data structure. I was going. Further, when communication with the database is required, a user request message is analyzed and a query statement is generated in one process.

  However, when receiving the request message, the front-end processing unit 304 according to the preferred embodiment of the present invention generates only a query name and a parameter corresponding to the request message without directly generating a query statement, and SQL. This is provided to the map processing unit 306.

  Here, the query name is a query name arbitrarily determined between the front-end processing unit 304 and the SQL map process processing unit 306, and the parameters are necessary for generating a query sentence such as a content ID and a user ID. Meaning information.

  One embodiment for the module configuration of such a front-end process processor is shown in FIG. As shown in FIG. 4, the front-end process processing unit 304 according to an embodiment of the present invention includes an authentication module 500, a connection setting module 502, an agent communication module 504, a random ID assignment module 506, a query name / parameter generation module. 508, and a random range setting module 510 may be included.

  The authentication module 500 has a function of determining whether or not a user who requests connection setting is an authenticated user. As an example, the authentication module 500 can determine whether or not the user is an authenticated user using the user ID and password information. Of course, various other known authentication methods such as an authentication method using a certificate can be used. The authentication module 500 can process user authentication in conjunction with a separate authentication server.

  The connection setting module 502 performs connection setting with a user client trying to connect to the P2P network. The connection setting can be performed in such a manner that a user client controlled by the agent program transfers a TCP connection request message and the connection setting module 502 accepts the message. Of course, a UDP connection can be set as required.

  The agent communication module 504 has a function of receiving a request message generated by the agent program and transferring a response message to the request message to the user client. As described above, the request message may include a peer registration request message, a peer deregistration request message, and a content request message, and the agent communication module 504 forwards a response message to the user message to the user client.

  The random ID assignment module 506 has a function of assigning a random ID to each peer when receiving a peer registration request message. Random ID assignment is an operation performed to provide peer information randomly when providing peer information to a client. When the peer information that dynamically changes according to the embodiment of the present invention is stored in the database, the peer information corresponding to the user's request cannot be extracted at random through the database query statement. The random ID assignment module 506 is an operation for solving such a problem.

  The random range setting module 510 has a function of randomly setting a number range for peer selection when a message requesting peer selection, such as a content request message, is received. The randomly set range is output as a parameter, and the SQL map process processing unit 306 generates a peer selection query statement using the range set from the random range setting module when selecting a peer.

  In the above-described embodiment, it has been described that the number of each peer is also assigned at random, and the range for selecting the peer is also set at random. However, peer numbers are assigned sequentially, but if the range is set at random or the peer number is assigned at random, but the range is set fixedly, it should be possible to select peers randomly. is there. A more detailed method for random selection of peers will be described through a separate figure.

  The query name / parameter generation module 508 generates a query name and parameters for processing the message received by the agent communication module 504. As described above, the front-end process processing unit 304 generates only a query name and parameters corresponding to the received message without directly generating a query statement for message processing, and sends it to the SQL map process processing unit 306. introduce.

  For example, when a peer registration request message is received, the query name / parameter generation module 508 generates a parameter corresponding to a preset query name “Register Peer” and a user ID, address, and content information included in the peer registration request message. Then, it is transmitted to the SQL map process processing unit 306.

  Referring to FIG. 3, the SQL map process processing unit 306 performs a function of processing the SQL map process. Here, the SQL map process is a query name / parameter from the front-end process processing unit 304. Is included, and a query statement corresponding to the query name / parameter is generated. The generated query statement is provided to the peer database 308 as a language that can be recognized from the peer database 308.

  The operation structure of the SQL map process processing unit 306 will be specifically described with reference to FIG. As shown in the figure, the SQL map process processing unit 306 receives a query name and parameters from the front-end process processing unit 304. FIG. 5 shows that the query name “GetUserInfo” and the parameter “foo” are received from the front-end process processing unit 304.

  The SQL map process processing unit 306 has information for mapping the query name and parameter to the SQL statement, and the SQL map process processing unit 306 that has received the query name and parameter is a database language using the mapping information. Output the query statement.

  Such query statements correctly maintain database schema, database definition statements that define relationships between objects, database manipulation statements for operations such as inserting / deleting / updating database data, and database data. All database control statements for ensuring integrity can be included.

  According to one embodiment of the present invention, the mapping information can be stored in a document in XML format. Specifically, an XML document for mapping to the query name “GetUserInfo” can be defined as shown in the left box of FIG.

  The SQL map process processing unit 306 uses the XML mapping information as described above, as shown in FIG. . . A query statement of WHERE ID =: id,: id = “foo” is generated and provided to the peer database 308. The peer database receives such a query statement and extracts user information of the user “foo”.

  As described above, the process of processing the request message received from the user (front-end process) and the process of generating a query statement corresponding to the user's request message (SQL map process) are separated from each other. The form has various advantages.

  First, by separating the message and connection processing process and the query statement generation process, it is possible to effectively adjust the process to be performed according to the state of the peer management server. For example, when there are more connection processing and message processing requests than query statement generation requests, the peer management server can generate and operate a larger number of front-end process processing units 304. Also, when more resources are required for generating a query statement than message processing, the peer management server can generate and operate a larger number of SQL map process processing units 406. In other words, by appropriately generating the front-end process processing unit 304 and the SQL map process processing unit 306 according to the state of the peer management server, it is possible to effectively use the limited resources.

  Furthermore, even if the database is changed, only the SQL map process is updated, and the front-end process does not need to be updated. Therefore, the time and cost when updating the database can be reduced. Centralized management of these becomes easier.

  In the peer database 308, the connected peer information is added / deleted / updated according to the query statement generated by the SQL map process processing unit 306. According to an embodiment of the present invention, the peer database 308 may store registered peer user IDs, peer addresses, and content information stored by the peers. The peer database 308 stores random ID information described later for each peer.

  Referring to FIG. 3, the state determination unit 300 has a function of determining the state of the peer management server 200. Here, the state determination is performed based on whether a large amount of server resources are required for message and connection processing, or It is determined whether or not it takes a lot of server resources to generate a query statement.

  The control unit 302 has a function of generating or extinguishing the front-end process processing unit 304 or the SQL map process processing unit 306 according to the determination result of the state determination unit 300.

  Although FIG. 3 shows that the peer management server includes both the front-end process processing unit 304 and the SQL map process processing unit 306, in a modified embodiment, the front-end process processing unit 304 and the SQL map are displayed. It will be apparent to those skilled in the art that the process processing unit 306 can be included in a separate server.

  FIG. 6 is a diagram showing a connection structure between the SQL map process processing unit and the peer database according to the embodiment of the present invention. As shown in the figure, the SQL map process processing unit 306 can be connected to a number of peer databases 308 independently of the front-end process processing unit 304. Even if the peer database 308 is added, the codes of the front-end process processing unit 304 and the client agent program need not be changed, and only the code of the SQL map process processing unit 306 is changed.

  Furthermore, since codes and SQL are not mixed and SQL is managed by the SQL map process processing unit 306, centralized management for SQL becomes possible. In particular, monitoring and statistical information can be easily calculated, and an abnormal query sentence having a long execution time can be easily detected.

  FIG. 7 is a block diagram showing a module configuration of the agent program according to the embodiment of the present invention. Such an agent program is incorporated in the user client and enables the user client to connect to the peer management server according to the present invention. As shown in the figure, the agent program may include a download check module 400, a connection setting module 402, a peer registration / cancellation module 404, a peer information receiving module 406, a peer connection setting module 408, and a content storage module 410. .

  The download check module 400 has a function of checking whether the agent program is downloading content from another peer. As described above, according to one embodiment of the present invention, the download check module 400 determines whether the agent program is downloading when the peer is registered in the active or inactive state depending on whether or not it is downloaded. Check continuously.

  The connection setting module 402 has a function of setting connection with the peer management server 200. Normally, the P2P agent program transfers a peer registration request message at the time of connection setting. However, according to an embodiment of the present invention, the connection setting module 402 performs only connection setting with the peer management server 200 and sets the connection. No peer registration request message is forwarded at As described above, the connection setting module 402 can perform TCP connection setting with the peer management server 200, and can also set a UDP connection as necessary.

  The peer registration / cancellation module 404 has a function of generating and transferring a peer registration request message or a peer registration cancellation request message according to the download check result of the download check module 400.

  If a download state is detected from the download check module 400, the peer registration / cancellation module 404 transfers a peer registration request message to the peer management server 200, and the peer management server 200 performs a peer registration procedure. When a peer registration request is made, the content information stored in the client is included in the peer registration request message.

  When the download completion state is detected from the download check module 400, the peer registration / cancellation module 404 transfers a peer registration cancellation request message to the peer management server 200, and the peer management server 200 performs a peer registration cancellation procedure.

  The peer information receiving module 406 has a function of requesting content from the peer management server 200 and receiving peer information from the peer management server 200. The peer information receiving module 406 generates a content request message and transfers it to the peer management server 200, and the content request message includes content ID information that can identify the content. The peer information receiving module 406 receives peer information responding to the content request message from the peer management server 200. Here, the peer information may include only one peer or a plurality of peer lists.

  The peer connection setting module 408 has a function of setting a connection with a peer that receives content based on the peer information received by the peer information receiving module 406 and downloading the content. Setting the connection with the peer and downloading the content is only a general P2P technology, and thus detailed description thereof will be omitted.

  The content storage module 410 has a function of storing content information received from other peers in a preset area. In order to prevent the content received by the user from being illegally used, the content storage module 410 desirably stores the received content encrypted.

  FIG. 8 is a flowchart showing an operation in which a user client according to an embodiment of the present invention requests peer registration and peer registration cancellation.

  Referring to FIG. 8, first, the user client transmits a content request message for requesting specific content through the agent program to the peer management server (S600).

  The user client receives the peer information transferred from the peer management server 200 according to the content request message (S602). According to one embodiment of the present invention, the peer management server 200 randomly selects peers so that peer information storing specific content is evenly provided to user clients. Will be described later.

  The user client that has received the peer information sets up a connection with the peer using the address information included in the peer information by the agent program (S604). When the connection with the peer is set, the user client downloads content from the peer set with the connection (S606).

  When it is detected that the download is started from another peer, the agent program performs a peer registration procedure by transferring a peer registration request message to the peer management server 200 so that the user client is registered with the active peer ( S608).

  Through this peer registration procedure, when the peer is registered as an active peer, other user clients will request content, through which the peer will respond to content requests from other user clients. To transfer.

  Thereafter, the agent program monitors whether the downloading of the user client is completed (S612).

  When the download is completed, the agent program transmits a peer deregistration request message to the peer management server 200, and cancels the active state of the peer by performing a peer deregistration procedure (S614).

  FIG. 9 is a flowchart illustrating a peer registration process according to an embodiment of the present invention.

  Referring to FIG. 9, the agent program installed in the user client monitors whether the user client is downloading content from another peer (S900).

  When the content download is detected, the agent program generates a peer registration request message (S902). An embodiment for the field structure of such a peer registration request message is shown in FIG. As shown in the figure, the peer registration request message includes at least one of an identifier field 1200, a user ID field 1202, an address field 1204, and a content ID field 1206.

  In the identifier field 1200, an identifier for identifying the peer registration request message is recorded in a preset code form.

  The user ID field 1202 records ID information of a user who requests peer registration, and the address 1204 field records the IP address and port number of the user client. In the content ID 1206 field, ID information that can identify the content held by the user client is recorded. Here, the content corresponding to the content ID can include not only the content provided by the service provider but also the content (User Created Content: UCC) produced by the user.

  The generated peer registration request message is received from the front end process processing unit 304 (S904), and the front end process processing unit 304 uses the query name corresponding to the peer registration request message and the user ID included in the peer registration request message. The parameters for the address and the content ID are generated (S906).

  The generated query name and parameters are transmitted to the SQL map process processing unit 306, and the SQL map process processing unit 306 generates a query statement corresponding to the transmitted query name and parameters using the mapping information (S910). . At this time, the generated query statement is a query statement for inserting new peer information (user ID, address, content ID) into the database.

  FIG. 10 is a flowchart illustrating a process of providing peer information from a peer management server according to an embodiment of the present invention.

  Referring to FIG. 10, a content request message including ID information of a specific content is transferred from the user client to the front end process processing unit 304 (S1000).

  The front-end process processing unit 304 generates a query name corresponding to the content request message and a parameter for the content ID included in the content request message (S1002).

  The generated query name and parameter are transmitted to the SQL map process processing unit 306, and the SQL map process 306 uses the parameter and the query name to randomly select a peer holding the requested content. A query statement is generated (S1006). A query sentence for random selection will be described later with reference to FIG.

  The SQL map process processing unit 306 receives peer information corresponding to the generated query statement from the peer database 308 (1008), and provides the received peer information to the front-end process processing unit 304 (S1010).

  The front-end process processing unit 304 transfers the peer information to the user client (S1012). The user client that has received the peer information through such a process sets up a connection with the peer using the provided peer information, and downloads the content.

  FIG. 11 is a flowchart illustrating a process for randomly selecting a peer having content requested by a user according to an embodiment of the present invention.

  As described above, when peer information that is dynamically changing is managed by the peer database as in the present invention, it is difficult to randomly select a peer so that connections to each peer are uniformly maintained. This is because the database is configured to extract data that meets a specific condition, and a database query statement for random selection is not provided.

  To this end, according to an embodiment of the present invention, when peer registration is requested from a user client, the front-end process processing unit 304 randomly assigns an ID in the form of a number to each user client (S1100). Since the front-end process processing unit 304 is a process unrelated to the database and the query statement, it is possible to assign a random ID to each peer using a general random function.

  When the random ID is assigned, the SQL map process processing unit 306 stores the random ID in the peer database 308 together with the user ID, address, and content information included in the peer information (S1102).

  When peer information storing specific content is requested (S1104), the front-end process processing unit 304 sets a range for selecting a peer at random, and specifies a randomly set range Is output, and the SQL map process processing unit 306 generates a query statement for selecting peers in the range specified using the parameters (S1106).

  Such a query statement can be generated using a general SELECT syntax and a range specification (<=,> =, between) method provided from the SELECT syntax. For example, a query statement for selecting a peer with a random ID of 10 to 20 can be generated, and a query statement for selecting a peer with a random ID of 5 or less can be generated.

  The peer database 308 selects a peer corresponding to the SELECT syntax and provides it to the SQL map process processing unit 306 (S1108).

  As described above, randomly selecting a peer may be performed by randomly processing only one of random ID assignment and random range setting. For example, number IDs are given sequentially rather than randomly, but by selecting a number range for peer selection at random, it should be possible to perform random selection for peers.

  As another example, a number ID is randomly assigned to each peer, but by selecting a fixed range for peer selection, a random selection for the peer should be possible.

  In this way, by assigning a random ID to each peer and managing the given random ID together in the database, it is possible to make a random selection for the peer that possesses the content. When setting the connection, it is possible to control the connections so that the connections are evenly distributed without the connections being concentrated on specific peers.

  As described above, according to the present invention, there is an advantage that peer information connected to the P2P system can be effectively managed by the database.

  In addition, according to the present invention, there is an advantage that server resources can be used more effectively by generating the front-end process and the SQL map process according to the server state.

  Furthermore, according to the present invention, the database management and the message processing of the client are unified, so that there is an advantage that the database can be expanded and upgraded with a minimum correction at the time of database expansion and system upgrade.

  Furthermore, according to the present invention, it is possible to minimize the load on the user client when using the P2P system by allowing the user client to operate as an active peer only at the time of download.

Claims (16)

A front-end process processing unit that establishes a connection with a peer connected to the P2P system, receives a message from the peer, and generates a query name and parameters corresponding to the received message for message processing;
An SQL map process processing unit that includes mapping information for mapping the query name and parameter to a query statement, and outputs a query statement corresponding to the query name and parameter received from the front-end process processing unit, and an active peer In a P2P system, including a peer database that holds information on operating peers and content information held by each peer, and updates or extracts data according to the query statement output from the SQL map process processing unit Peer management server. A state determination unit that checks the connection state and message processing state of the peer and the generation state of the query statement, and the front-end process processing unit and the SQL map process processing unit according to the determination result of the state determination unit The peer management server in the P2P system according to claim 1, further comprising a control unit that controls generation and disappearance of the P2P system.   The peer management in the P2P system according to claim 1, wherein the message received from the peer includes at least one of a peer registration request message, a peer deregistration request message, and a content registration request message. server.   The peer registration request message is a message for registering the peer with an active peer when the peer is in a download state, and the peer deregistration request message is active when the peer is in a download complete state. The peer management server in the P2P system according to claim 3, wherein the message is a message for releasing from a peer.   The peer registration request message includes a user ID, an address, and possessed content information, and the front-end process processing unit includes a preset query name corresponding to the peer registration request message, the user ID, an address, and A parameter corresponding to the stored content information, and the SQL map process processing unit analyzes the query name and parameter to generate the query statement and extract peer information from the peer database. The peer management server in the P2P system according to claim 3, wherein the peer management server is a peer management server.   The peer management server in the P2P system according to claim 1, wherein the SQL map process processing unit stores the mapping information in the form of an XML document. The front-end process processing unit
An authentication module for determining whether the peer coupled to the P2P system is an authenticated peer;
A connection setup module for setting up a connection between the peer and the P2P system if the peer is an authenticated peer;
An agent communication module that receives the message from the peer and forwards a response message corresponding to the message to the peer;
A random ID assignment module for assigning a random ID to the peer requested to register when the peer registration request message is received from the peer;
When a content request message is received from the peer, a random range setting module that randomly sets a selection range for selection of another peer including the requested content, and a message received by the agent communication module The peer management server in the P2P system according to claim 1, further comprising a query name / parameter generation module for generating a query name and a parameter for the processing. A method for managing peer information in a P2P system,
Receiving a peer registration request message from a peer connected to the P2P system;
Generating a query name and parameters corresponding to the peer registration request message;
Generating a query statement corresponding to the peer registration request message using mapping information for mapping the query name and parameters to a query statement; and using the query statement to assign the peer to a peer information database as an active peer A peer information management method comprising the step of: In the peer registration request message receiving step,
The method of claim 8, wherein the peer registration request message is received from the peer to register the peer with an active peer when the peer is in a download state.   9. The peer information management method according to claim 8, wherein the parameter is generated according to a user ID, an address, and retained content information included in the peer registration request message.   The peer information management method according to claim 8, wherein the mapping information is stored in an XML format. Receiving a content request message from the peer;
Generating a query name corresponding to the content request message and a parameter for the content ID included in the content request message;
Generating a query name corresponding to the content request message using the mapping information and a peer selection query statement corresponding to the parameter; and storing content associated with the content ID from the peer database by the peer selection query statement The method of claim 8, further comprising: extracting peer information to be provided and providing the peer information to the peer.   The query name and parameter generation step and the query statement generation step are processed by a separate process, and for the processing of the query name and parameter generation step and the query statement generation step, resource allocation of the P2P system is performed. The method according to claim 8, further comprising adjusting a state.   A recording medium on which a program for executing the method according to any one of claims 8 to 13 is embodied, the program being provided in the digital data processing apparatus and recording the program readable by the digital data processing apparatus . A recording medium in which an agent program is installed, which is incorporated in a peer connected to a P2P system and allows the peer to receive a P2P service,
A connection setting module for setting a connection between the peer and the P2P system;
A peer information receiving module for generating and transferring a content request message to the P2P system and receiving other peer information including the content from the P2P system;
A peer connection setting module for downloading the content from the other peer by setting the connection with the other peer based on the other peer information received by the peer information receiving module;
A download check module for checking whether the peer is downloading the content;
A recording medium on which an agent program is recorded, comprising a peer registration / release module that generates a peer registration request message and a peer registration release request message according to a check result by the download check module and transfers the message to the P2P system. The peer registration / cancellation module
If the download check module determines that the peer is downloading the content, it generates and forwards the peer registration request message, and the download check module indicates that the peer has completed downloading the content. 16. The recording medium having an agent program recorded thereon according to claim 15, wherein if judged, the peer deregistration request message is generated and transferred.

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