Information delivery system, reregistration message sending method, node device, and recording medium recording node processing program

A node device included in an information delivery system that includes a plurality of node devices enabled to mutually communicate through a network,

• wherein transfer destination node information indicative of a node device, among the node devices, to which a message received from another node device, among the node devices, is transferred is respectively memorized in the node devices, and at least one piece of delivery information is distributed and stored in the node devices,
• wherein a registration message including storage source node information indicative of one node devices, among the node devices, storing the delivery information is sent out of the one node device in a case where the delivery information is stored in the one node device, the registration message is transferred up to a node device, among the node devices, for managing delivery information location through a plurality of relay node devices, among the node devices, in accordance with the transfer destination node information, and the storage source node information and the latest node information indicative of a latest node device, among the node devices, for sending or transferring the registration message to the own node are memorized in correspondence with each other in the relay node devices and the node device for managing delivery information location in the information delivery system,
• wherein the relay node device included in the information delivery system comprising:
• a memory means for memorizing the transfer destination node information, the storage source node information, and the latest node information;
• a request message receiving means for receiving a request message indicative of a request of the storage source node information;
• a confirmation means for confirming that a node device, among the node devices, indicated in storage source node information related to the request exists;
• a deletion message sending means for sending an upstream side deletion message indicative of a deletion request of the storage source node information thus requested and sending a downstream side deletion message indicative of deletion request of the storage source node information related to the request in a case where it is confirmed that the node device indicated in storage source node information does not exist;
• and
• a storage source node information deleting means for deleting the storage source node information related to the request and thus memorized in a case where it is confirmed that the node device indicated in storage source node information does not exist.

A node device included in an information delivery system that includes a plurality of node devices enabled to mutually communicate through a network,

• wherein transfer destination node information indicative of a node device, among the node devices, to which a message received from another node device, among the node devices, is transferred is memorized respectively in the node devices, and at least one piece of delivery information is distributed and stored in the node devices,
• wherein a registration message including a storage source node information indicative of one node device, among the node devices, storing the delivery information is sent out of the one node device in a case where the delivery information is stored in the one node device, the registration message is transferred up to a node device, among the node devices, for managing a delivery information location through a plurality of relay node devices, among the node devices, in accordance with the transfer destination node information, and
• the storage source node information and the latest node information indicative of a latest node device, among the node devices, for sending or transferring the registration message to the own node are memorized in correspondence with each other in the relay node devices and the node device for managing delivery information location in the information delivery system,
• wherein the relay node device included in the information delivery system comprising:
• a memory means for memorizing the transfer destination node information, the storage source node information, and the latest node information;
• and
• a request message receiving means for receiving a request message indicative of request of the storage source node information;
• a confirmation means for confirming whether or not the node device indicated in the storage source node information related to the request stores the delivery information;
• a deletion message sending means for sending an upstream side deletion message indicative of a deletion request of the storage source node information related to the request and sending a downstream side deletion message indicative of a deletion request of the storage source node information related to the request in a case where it is confirmed that the node device indicated in storage source node information does not store;
• and
• a storage source node information deleting means for deleting the storage source node information related to the request and thus memorized in a case where it is confirmed that the node device indicated in storage source node information does not exist.

An information delivery system including a plurality of node devices enabled to mutually communicate through a network,

• wherein transfer destination node information indicative of a node device, among the node devices, to which a message received from another node device, among the node devices, is transferred is memorized respectively in the node devices, and at least one piece of delivery destination information is distributed and stored in the node devices,
• wherein a registration message including a storage source node information indicative of one node device, among the node devices, storing the delivery information is sent out of the one of the node devices in a case where the delivery information is stored in the one node device,
• the registration message is transferred up to a node device, among the node devices, for managing delivery information location through a plurality of the relay node devices, among the node devices, in accordance with the transfer destination node information, and
• the storage source node information is memorized in the relay node devices and the node device for managing delivery information location,
• wherein the relay node device comprising:
• a memory means for memorizing the transfer destination node information and the storage source node information;
• a node information change detection means for detecting a change of the transfer destination node information;
• a storage source node information extraction means for extracting the storage source node information, which is included in the registration message transferred in accordance with the transfer destination node information before the change from the memory means;
• a reregistration message generation means for generating a reregistration message including the storage source node information thus extracted;
• and
• a reregistration message sending means for sending thus generated reregistration message in accordance with the transfer destination node information after the change,
• wherein the node device receiving the reregistration message comprising:
• a memory means for memorizing the transfer destination node information;
• a memory judgment means for judging whether or not the storage source node information included in thus received reregistration message is already memorized;
• and
• a reregistration message transfer means for memorizing the storage source node information and transferring the reregistration message in accordance with the transfer destination node information in a case where it is judged not memorized.

An information delivery system including a plurality of node devices enabled to mutually communicate through a network,

• wherein transfer destination node information indicative of a node device, among the node devices, to which a message received from another node device, among the node devices, is transferred is memorized respectively in the node devices, and at least one piece of delivery information is distributed and stored in the node devices,
• wherein a registration message including a storage source node information indicative of one node device, among the node devices, storing the delivery information is sent out of the one node device in a case where the delivery information is stored in the one node device, the registration message is transferred up to a node device, among the node devices, for managing the delivery information location by a plurality of the relay node devices, among the node devices, in accordance with the transfer destination node information, and the storage source node information is memorized in the relay node devices and the node device for managing the delivery information location,
• wherein the relay node device comprising:
• a memory means for memorizing the transfer destination node information and the storage source node information;
• a node information change detection means for detecting a change of the transfer destination node information;
• a storage source node information extraction means for extracting the storage source node information, which is included in the registration message transferred in accordance with the transfer destination node information before the change from the memory means;
• a reregistration message generation means for generating a reregistration message including the storage source node information thus extracted;
• and
• a reregistration message sending means for sending thus generated reregistration message in accordance with the transfer destination node information after the change,
• wherein the node device receiving the reregistration message comprising:
• a memory means for memorizing latest node information indicative of a latest node device, among the node devices, sending or transferring the registration message to the own node device in correspondence with the storage source node information included in the registration message;
• a memory judgment means for judging whether or not the storage source node information included in thus received reregistration message is already memorized;
• and
• a deletion message sending means for sending a deletion message indicative of a deletion request of the storage source node information included in the reregistration message in accordance with the latest node information, memorized in correspondence with the storage source node information in a case where it is judged memorized.

A reregistration message sending method in an information delivery system including a plurality of node devices enabled to mutually communicate through a network,

• wherein transfer destination node information indicative of a node device, among the node devices, to which a message received from another node device, among the node devices, is transferred is memorized respectively in the node devices, and at least one piece of delivery information is distributed and stored in the node devices,
• wherein a registration message including storage source node information indicative of one node device, among the node devices, storing the delivery information is sent out of the one node device in a case where the delivery information is stored in the one node device,
• the registration message is transferred up to a node device, among the node devices, for managing the delivery information location by the relay node devices in accordance with the transfer destination node information, and
• the storage source node information is memorized in the relay node devices and the node device for managing the delivery information location,
• wherein the reregistration message sending method comprising:
• a step for the relay node device of detecting a change of the transfer destination node information;
• a step for the relay node device of extracting the storage source node information, which is included in the registration message transferred in accordance with the transfer destination node information before the change, from the memory means;
• a step for the relay node device of generating the reregistration message including the storage source node information thus extracted;
• a step for the relay node device of sending thus generated reregistration message in accordance with the transfer destination node information after the change;
• a step for the node device receiving the reregistration message of judging whether or not the storage source node information included in thus received reregistration message is already memorized;
• and
• a step for the node device receiving the reregistration message of memorizing the storage source node information and transferring the reregistration message in accordance with the transfer destination node information in a case where it is judged not memorized.

A reregistration message sending method in an information delivery system including a plurality of node devices enabled to mutually communicate through a network,

• wherein transfer destination node information indicative of a node device, among the node devices, to which a message received from another node device, among the node devices, is transferred is memorized respectively in the node devices, and at least one piece of delivery information is distributed and stored in the node devices,
• wherein a registration message including a storage source node information indicative of one node device, among the node devices, storing the delivery information is sent out of the one node device in a case where the delivery information is stored in the one node device, the registration message is transferred up to a node device, among the node devices, for managing the delivery information location by a plurality of relay node devices, among the node devices, in accordance with the transfer destination node information, and the storage source node information is memorized in the relay node devices and the node device for managing the delivery information location,
• wherein the reregistration message sending method comprising:
• a step for the relay node device of detecting a change of the transfer destination node information;
• a step for the relay node device of extracting the storage source node information, which is included in the registration message transferred in accordance with the transfer destination node information before the change, from the memory means;
• a step for the relay node device of generating the reregistration message including the storage source node information thus extracted;
• a step for the relay node device of sending thus generated reregistration message in accordance with the transfer destination node information after the change;
• a step for the node device receiving the reregistration message for judging whether or not storage source node information included in thus received reregistration message is already memorized;
• and
• a step for the node device receiving the reregistration message of sending a deletion message indicative of a deletion request of the storage source node information included in the reregistration message in accordance with latest node information, memorized in correspondence with the storage source node information in a case where it is judged memorized.