JP5312776B2 - Network system and update information sharing method - Google Patents

Description

  The present invention relates to a technique for distributing updated content to each node in a network when server content is updated in a server client system.

For this, the following methods existed.
(1) PULL method: A method in which each node in the network checks whether content has been updated at the timing of accessing the server, and if there is an update, downloads the updated content.
(2) PUSH method: A method in which updated content is distributed from a server to each node in the network.
(3) Peer-to-peer method: A method in which updated content is propagated and distributed from a node that has acquired updated content from a server to another node in the network by peer-to-peer communication.

  However, (1) In the case of the PULL method, since each node does not know whether or not there is an update until it tries to access the server, after the content is updated on the server side, There was a considerable time lag before new content spread.

  In addition, in the case of (2) PUSH method, since the updated content must be distributed from the server to each node in the network, the load on the server increases as the number of nodes connected to the network increases. There was a problem to say.

  (3) When the peer-to-peer method is adopted, although the load on the server is reduced, there is a problem that management on the server side becomes impossible.

  Further, as the contents of the server increase, each client refers to various contents. Therefore, when some contents are updated on the server, the update information is not necessarily required for all users.

  Therefore, an object of the present invention is to promptly notify the necessary client of the update information when the contents of the server are updated.

  A network system according to an embodiment of the present invention is a network system including a peer-to-peer network having a plurality of nodes capable of peer-to-peer communication with each other and a content server, wherein the content server is provided to the plurality of nodes. Content storage means for storing content to be stored. The plurality of nodes respectively access communication means for performing peer-to-peer communication with each other, content update means for accessing the content server and updating content stored in the content storage means, and access to the content server. , Content acquisition means for acquiring desired content from the content storage means, and acquisition content storage means for storing content acquired from the content server. Then, when the content update means of the first node among the plurality of nodes updates the content stored in the content storage means of the content server, each node in the peer-to-peer network is updated. Update information related to the received content is shared with each other by peer-to-peer communication, and each node in the peer-to-peer network determines whether or not the content stored in the acquired content storage means of its own node has been updated based on the update information When updated, the updated content is acquired.

  In a preferred embodiment, the content server further comprises means for notifying the update information to a second node among the plurality of nodes when the content stored in the content storage means is updated. Each node in the peer-to-peer network may share update information acquired by the second node with each other by peer-to-peer communication.

  In a preferred embodiment, the content stored in the content storage unit includes content identification information and a content body, and the update information includes at least the content body of the updated content, Each node in the peer-to-peer network stores the content body included in the update information in the acquired content storage unit of the own node when the content stored in the acquired content storage unit of the own node is updated. You may do it.

  In a preferred embodiment, the update information notified from the content server includes identification information of one or more nodes in the peer-to-peer network. Each node in the peer-to-peer network updates the content stored in the acquired content storage means of the own node based on the update information when the identification information includes the identification information of the own node. May be.

  In a preferred embodiment, after the content update means of the first node updates the content stored in the content storage unit of the content server, the first node generates the update information, and the peer-to-peer Each node in the network may share the update information generated by the first node with each other by peer-to-peer communication.

  In a preferred embodiment, the content stored in the content storage unit includes content identification information, and the update information includes at least updated content identification information. If the third node different from the node stores the content identification information included in the update information in the acquired content storage unit of the third node, the content acquiring unit of the third node The updated content body may be acquired from content storage means of the content server.

  In a preferred embodiment, the content server may perform authentication of the third node when the content acquisition unit of the third node acquires the updated content body from the content storage unit. Good.

  In accordance with one embodiment of the present invention, a network system comprising a peer-to-peer network having a plurality of nodes capable of peer-to-peer communication with each other and a content server is the content acquired by each node in the peer-to-peer network from the content server. Acquisition content storage means for storing. Then, a first node of the plurality of nodes updates the content stored in the content server, and the nodes in the peer-to-peer network update information regarding the updated content to each other by peer-to-peer communication. Each node in the peer-to-peer network determines whether or not the content stored in the acquired content storage means of its own node has been updated based on the update information, and when updated, the updated content To get.

  Hereinafter, a network system according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram of a network system according to the first embodiment of the present invention.

  The system includes a content server 10 and a plurality of nodes 30, 30,... Constituting a peer-to-peer (hereinafter referred to as P2P) network 9. Each node 30, 30, ... receives content from the content server 10 as a client.

  The nodes 30, 30,... Include at least one parent node 30a. As will be described later, the parent node 30a receives the notification of the update information 100 from the content server 10 and notifies other nodes, and may be called other nodes (child nodes to distinguish them from the parent nodes). ) And the same function and configuration. The parent node does not always need to be a specific node, and the node functioning as the parent node may change depending on the type of content, the timing of processing, and the like.

  Each of the content server 10 and the plurality of nodes 30, 30,... Is configured by, for example, a general-purpose computer system, and each of the content server 10 and each of the nodes 30, 30,. A component or a function is implement | achieved by running a computer program, for example.

  The content server 10 stores a content storage unit 11 that stores content to be provided to each of the nodes 30, 30,... Serving as a client, and an update indicating that the content stored in the content storage unit 11 has been updated. And an update information generation unit 13 for generating information.

  The content storage unit 11 stores the body (main body) of content divided into predetermined blocks, and identification information (content ID) is assigned to the body of each content. The content stored in the content storage unit 11 can be referred from each node 30, 30,. Further, the content stored in the content storage unit 11 can be updated by each of the nodes 30, 30,.

  When the content stored in the content storage unit 11 is updated, the update information generation unit 13 generates update information 100 regarding the update content. For example, the update information generation unit 13 generates the update information 100 that specifies the updated content, or the update information 100 that includes the content of the updated content.

  FIG. 2 shows an exemplary data structure of the update information 100.

  As shown in the figure, the update information 100 includes a P2P header 110 and a unique format unit 130 including update contents. The unique format unit 130 includes an ID 131, a distribution designation node 133, a content ID 135, a content body 137, and an extended area 139.

  The distribution designation node 133 indicates identification information of the nodes 30, 30,. Specifically, information set for each client machine such as an IP address and a machine name may be used, or information set for each user such as an employee code and a login ID may be used. The content ID 135 indicates an ID for identifying the updated content. The content body 137 indicates the content of the updated content body. Arbitrary information can be stored in the extended area 139. For example, the extended area 139 may store identification information of the user (node) who updated the content.

  Next, the functional configuration of each of the nodes 30, 30,. In FIG. 1, the functional configuration of the node 30b is shown as a representative, and some of the other nodes 30, 30,... Are not shown. However, the nodes 30, 30,..., Not shown, also have a configuration common to the node 30b.

  Each of the nodes 30, 30,... Includes a server communication unit 31, a content management unit 33, a content storage unit 35, and a P2P communication unit 37.

  The server communication unit 31 communicates with the content server 10. For example, the server communication unit 31 acquires content stored in the content storage unit 11 of the content server 10. In addition, the server communication unit 31 updates the content stored in the content storage unit 11 of the content server 10. The content management unit 33 manages content acquired from the content server 10. For example, the content management unit 33 stores the content acquired from the content server 10 in the content storage unit 35. In addition, the content management unit 33 issues an instruction to update the content stored in the content storage unit 11 of the content server 10 via the server communication unit 31 in accordance with an instruction from the user. The content storage unit 35 stores content acquired from the content server 10. In the content storage unit 35, for example, a content ID and a content text are stored. The P2P communication unit 37 performs P2P communication with the other nodes 30, 30,. For example, the P2P communication unit 37 exchanges the update information 100 with the P2P communication unit 37 of another node.

  In FIG. 1, for the nodes other than the node 30b, only the content storage unit 35 is described, and the server communication unit 31, the content management unit 33, and the P2P communication unit 37 are omitted. Furthermore, the content ID stored in the content storage unit 35 is shown.

  FIG. 1 shows a case where the node 30b updates the content B of the content server 10. That is, when the node 30b updates the content B, the update information generation unit 13 generates the update information 100 (see FIG. 2) related to this update. This update information 100 is notified to the parent node 30a. The parent node 30a is received by the server communication unit 31 and notifies the update information 100 received by the P2P communication unit 37 to the other nodes 30, 30,.

  In each node 30, 30,..., When the P2P communication unit 37 acquires the update information 100, the content management unit 33 performs a predetermined process. A detailed procedure of processing performed by the content management unit 33 is shown in FIG. Hereinafter, a description will be given with reference to FIG.

  First, when any of the nodes 30 receives the update information 100, the content management unit 33 reads the unique format unit 130 of the received update information 100 (S10). Then, the content management unit 33 determines whether or not the local node is included in the distribution designation node 133 (S12).

  When the distribution designation node 133 does not include the own node (S12: No), the update information 100 is update information of the content that is not referred to by the own node, so the content management unit 33 ends the process as it is. On the other hand, if the local node is included in the distribution designation node 133 (S12: Yes), it is determined whether or not the content ID 135 matches the content ID stored in the content storage unit 35 (S14).

  Then, the content management unit 33 updates the content storage unit 35 based on the content body 137 of the update information 100 (S20). In other words, the content management unit 33 overwrites the information stored in the content body 137 with the corresponding content in the content storage unit 35.

  Thereby, when any node 30 of the P2P network 9 updates the content of the content server 10, the other nodes 30 that need the updated content do not acquire the content from the content server 10 again and perform P2P communication. Thus, the updated content can be acquired quickly. That is, the content required by each node 30, 30,... Can be quickly acquired without imposing a load on the content server 10.

  In addition, since a node that does not have content before update in advance cannot acquire the content after update, it is possible to prevent content from being distributed indefinitely to nodes that do not have the title.

  Further, by configuring the update information 100 to include the identification information of the node that is the distribution target of the updated content as the distribution designation node 133, in addition to the presence / absence of the content before the update, each node has the updated content It is possible to designate whether or not to be distributed.

  Next, a network system according to the second embodiment of the present invention will be described.

  FIG. 4 is a configuration diagram of a network system according to the second embodiment of the present invention. Hereinafter, description will be made centering on differences from the first embodiment, and the same components as those in the first embodiment may be denoted by the same reference numerals and description thereof may be omitted.

  The system includes a content server 10 and a plurality of nodes 40, 40,... Constituting the P2P network 8. In this embodiment, unlike the first embodiment, there is no parent node. Each node 40, 40,... Receives content from the content server 10 as a client.

  Each of the nodes 40, 40,... Is configured by, for example, a general-purpose computer system, and individual components or functions in the nodes 40, 40,. It is realized by executing.

  Each node 40, 40,... Includes a server communication unit 31, a content management unit 43, a content storage unit 35, and a P2P communication unit 37. 4, as in the case of FIG. 1, the functional configuration of the node 40a is representatively illustrated, and the functional configurations of the other nodes 40, 40,. That is, in FIG. 4, only the content storage unit 35 is described for nodes other than the node 40a, and the server communication unit 31, the content management unit 43, and the P2P communication unit 37 are omitted. Furthermore, the content ID stored in the content storage unit 35 is shown.

  The content management unit 43 manages the content acquired from the content server 10. For example, the content management unit 43 stores the content acquired from the content server 10 in the content storage unit 35. In addition, the content management unit 43 issues an instruction to update the content stored in the content storage unit 11 of the content server 10 via the server communication unit 31 in accordance with an instruction from the user. When the content management unit 43 instructs to update the content storage unit 11, the content management unit 43 generates update information 300 regarding the update content. For example, the update information includes data specifying the updated content.

  In the content storage unit 35, for example, a content ID and a content text may be stored, or only the content ID may be stored.

  FIG. 5 shows an exemplary data structure of the update information 300.

  As shown in the figure, the update information 300 includes a P2P header 110 and a unique format unit 330 including update contents and the like. The unique format unit 330 includes an ID 331, a content ID 333 of the content that the content management unit 43 has instructed to update, and an update user 335 that is identification information of the user who updated the content (that is, the own node).

  FIG. 4 shows a case where the node 40a updates the content B of the content server 10. That is, when the node 40a updates the content B, the content management unit 43 of the node 40a generates update information 300 (see FIG. 5) related to this update. The P2P communication unit 37 transmits this update information 300 to the other nodes 40, 40,. The other nodes 40, 40,... Share the update information 300 by performing P2P communication with each other.

  In each node 40, 40,..., When the P2P communication unit 37 acquires the update information 300, the content management unit 43 performs a predetermined process. A detailed procedure of processing performed by the content management unit 43 is shown in FIG. Hereinafter, a description will be given with reference to FIG.

  First, when any of the nodes 40 receives the update information 300, the content management unit 43 reads the unique format unit 330 of the received update information 300 (S30). Then, the content management unit 43 determines whether or not the content ID 333 matches the content ID stored in the content storage unit 35 (S32).

  When the content ID 333 does not match the content ID stored in the content storage unit 35 (S12: No), the process ends. On the other hand, when the content ID 333 matches the content ID stored in the content storage unit 35 (S32: Yes), the content management unit 43 acquires the content with the content ID 333 from the content server 10 (S34). The content management unit 43 saves (overwrites) the acquired content in the content storage unit 35 (S36).

  Here, the content management unit 43 may acquire the update information 300 and immediately go to the content server 10 to acquire the content. In order to prevent the access from being concentrated on the content server 10, the content management unit 43 shifts the time. You may go to get it. For example, the nodes 40, 40,... Are grouped into a plurality of groups by IP address, the content server 10 manages the accessible time zone for each group, and the updateable information 100 indicates the accessible time zone of each group. May be set to the extended area 139 to notify each node 40, 40,. Alternatively, based on the IP address of each node 40, 40,..., The time when the server communication unit 31 of each node 40, 40,. A waiting time until content is acquired may be determined.

  Thereby, when any node 40 of the P2P network 9 updates the content of the content server 10, each node 40, 40,... Can be updated without pushing update new information from the content server 10 to any node 40.・ Update information is notified. Then, the node 40 that needs the updated content can immediately acquire the updated content from the content server 10 from the content server 10.

In addition, according to the present embodiment, a node that does not have content before update in advance can not capture the content after update, so that it is possible to prevent unlimited content distribution to nodes that do not have the title. can do.
Furthermore, if authentication is performed when the content server 10 is accessed, only the authenticated node can acquire the updated content. Therefore, in addition to the presence / absence of the content before the update, each node It is possible to specify whether or not to distribute the updated content.

  The above-described embodiments of the present invention are examples for explaining the present invention, and are not intended to limit the scope of the present invention only to those embodiments. Those skilled in the art can implement the present invention in various other modes without departing from the gist of the present invention.

  For example, in the above-described embodiment, the case where the node in the P2P network updates the content of the content server has been described. However, the present invention is applicable even when the content other than the node in the P2P network updates the content. is there.

  The update information generated by the content server may not include the content body, and the update information generated by the node may include the content body.

1 is a configuration diagram of a network system according to a first embodiment of the present invention. An example of the data structure of the update information 100 is shown. It is a flowchart of the process which the content management part 33 in this embodiment performs. It is a block diagram of the network system which concerns on the 2nd Embodiment of this invention. An example of the data structure of the update information 300 is shown. It is a flowchart of the process which the content management part 43 in this embodiment performs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Content server, 11 ... Content storage part, 13 ... Update information generation part, 30, 40 ... Node, 31 ... Server communication part, 33, 43 ... Content management part, 35 ... Content storage part, 37 ... P2P communication part, 100, 300 ... Update information.

Claims (6)

A network system comprising a peer-to-peer network having a plurality of nodes capable of peer-to-peer communication with each other, and a content server,
The content server
Content storage means for storing content to be provided to the plurality of nodes,
The plurality of nodes are respectively
A communication means for performing peer-to-peer communication with each other;
Content updating means for accessing the content server and updating the content stored in the content storage means;
Content acquisition means for accessing the content server and acquiring desired content from the content storage means;
Acquired content storage means for storing content acquired from the content server;
With
The content server
When the content updating means of the first node of the plurality of nodes updates the content stored in the content storage means of the content server, the update information on the updated content is generated, and the update information includes update information generating means to notify the second node, of the plurality of nodes,
Each node in the peer-to-peer network shares the update information obtained by the second node with each other by peer-to-peer communication,
Each node in the peer-to-peer network, on the basis of the update information, determines whether the content stored in the acquisition content storage means of the node is updated, acquires the content of the updated when updated ,
The content stored in the acquired content storage means includes content identification information and a content body,
The update information includes at least the content body of the updated content,
Each node in the peer-to-peer network stores the content body included in the update information in the acquired content storage unit of the own node when the content stored in the acquired content storage unit of the own node is updated. A network system characterized by A network system comprising a peer-to-peer network having a plurality of nodes capable of peer-to-peer communication with each other, and a content server,
The content server
Content storage means for storing content to be provided to the plurality of nodes,
The plurality of nodes are respectively
A communication means for performing peer-to-peer communication with each other;
Content updating means for accessing the content server and updating the content stored in the content storage means;
Content acquisition means for accessing the content server and acquiring desired content from the content storage means;
Acquired content storage means for storing content acquired from the content server;
With
The content server
When the content updating means of the first node of the plurality of nodes updates the content stored in the content storage means of the content server, the update information on the updated content is generated, and the update information includes update information generating means to notify the second node, of the plurality of nodes,
Each node in the peer-to-peer network shares the update information obtained by the second node with each other by peer-to-peer communication,
Each node in the peer-to-peer network, on the basis of the update information, determines whether the content stored in the acquisition content storage means of the node is updated, acquires the content of the updated when updated ,
The update information includes identification information of one or more nodes in the peer-to-peer network,
Each node in the peer-to-peer network updates the content stored in the acquired content storage unit of the own node based on the update information when the identification information includes the identification information of the own node. A characteristic network system. In a network system comprising a peer-to-peer network having a plurality of nodes capable of peer-to-peer communication with each other and a content server,
Each node in the peer-to-peer network includes acquired content storage means for storing content acquired from the content server,
A first node of the plurality of nodes updates content stored in the content server;
When the first node updates the content stored in the content server, the content server generates update information regarding the updated content, and the update information is stored in the plurality of nodes. Notify the second node,
Each node in the peer-to-peer network shares the update information obtained by the second node with each other by peer-to-peer communication,
Each node in the peer-to-peer network, based on the update information, determines whether the content stored in the acquisition content storage means of the node is updated, acquires the content of the updated when updated Prepared
The content stored in the acquired content storage means includes content identification information and a content body,
The update information includes at least the content body of the updated content,
Each node in the peer-to-peer network stores the content body included in the update information in the acquired content storage unit of the own node when the content stored in the acquired content storage unit of the own node is updated. An update information sharing method characterized by: In a network system comprising a peer-to-peer network having a plurality of nodes capable of peer-to-peer communication with each other and a content server,
Each node in the peer-to-peer network includes acquired content storage means for storing content acquired from the content server,
A first node of the plurality of nodes updates content stored in the content server;
When the first node updates the content stored in the content server, the content server generates update information regarding the updated content, and the update information is stored in the plurality of nodes. Notify the second node,
Each node in the peer-to-peer network shares the update information obtained by the second node with each other by peer-to-peer communication,
Each node in the peer-to-peer network, based on the update information, determines whether the content stored in the acquisition content storage means of the node is updated, acquires the content of the updated when updated Prepared
The update information includes identification information of one or more nodes in the peer-to-peer network,
Each node in the peer-to-peer network updates the content stored in the acquired content storage unit of the own node based on the update information when the identification information includes the identification information of the own node. A feature of sharing update information. A computer program for realizing one of the plurality of nodes in a network system comprising a peer-to-peer network having a plurality of nodes capable of peer-to-peer communication with each other and a content server,
Storing the content acquired from the content server in the acquired content storage means;
Updating the content stored in the content server;
When update information related to the updated content is generated by the content server in response to the update and notified to another node in the peer-to-peer network, the update information acquired by the other node is mutually shared with the other node. Shared by peer-to-peer communication,
Based on the update information, it is determined whether or not the content stored in the acquired content storage means of the own node has been updated, and when updated , the computer is caused to acquire the updated content ,
The content stored in the acquired content storage means includes content identification information and a content body,
The update information includes at least the content body of the updated content,
When content stored in the acquisition content storage means of the node is updated, the content body contained in the update information, Ru is executed by the computer to store the acquired content storage means of the node A computer program for sharing update information characterized by the above. A computer program for realizing one of the plurality of nodes in a network system comprising a peer-to-peer network having a plurality of nodes capable of peer-to-peer communication with each other and a content server,
Storing the content acquired from the content server in the acquired content storage means;
Updating the content stored in the content server;
When update information related to the updated content is generated by the content server in response to the update and notified to another node in the peer-to-peer network, the update information acquired by the other node is mutually shared with the other node. Shared by peer-to-peer communication,
Based on the update information, it is determined whether or not the content stored in the acquired content storage means of the own node has been updated, and when updated , the computer is caused to acquire the updated content ,
The update information includes identification information of one or more nodes in the peer-to-peer network,
When included identification information of the own node to the identification information, characterized Rukoto to execute the computer to update the content stored in the acquisition content storage unit of the own node based on the update information A computer program for sharing update information.

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