Distributed content storage system, content storage method, node device, and node processing program

A non-transitory computer-readable storage medium that stores a computer-executable program for a content data storing and sharing system, the content data storing and sharing system comprising a plurality of node devices including an administrative node device, the plurality of node devices and the administrative node device being connected through a network, the plurality of node devices storing content data to be shared by the plurality of node devices and the administrative node device administrating the content data to be shared by the plurality of node devices, the program being stored in at least one node device in the plurality of node devices, the program comprising instructions for:

• at least one node device in the plurality of node devices performing steps of:
• determining a broadcast channel randomly, the content data to be stored being broadcasted in the broadcast channel;
• receiving the content data broadcasted in the determined broadcast channel;
• determining randomly whether unit content data corresponding to a predetermined amount of the content data is to be stored in the node device, in response to receiving the unit content data which is broadcasted in the determined broadcast channel;
• storing the unit content data, in response to determining that the unit content data is to be stored;
• and
• sending a registration message, informing that the received unit content data is stored in the node device, to the administrative node device, in response to storing the unit content data.

A content data storing and sharing system, the content data storing and sharing system comprising a plurality of node devices including an administrative node device, the plurality of node devices and the administrative node device being connected through a network, the plurality of node devices storing content data to be shared by the plurality of node devices, the administrative node device administrating the content data to be shared by the plurality of node devices and providing node information of the node devices which store the content data in response to a request from the node devices, wherein:

• at least one node device in the plurality of node devices comprises:
• a broadcast channel determination unit that randomly determines a broadcast channel, the content data to be stored being broadcasted in the broadcast channel;
• a content receiving unit that receives the content data broadcasted in the broadcast channel determined by the broadcast channel determination unit;
• a storage determining unit that randomly determines whether unit content data corresponding to a predetermined amount of the content data is to be stored, in response to receiving the unit content data which is broadcasted in the broadcast channel determined by the broadcast channel determination unit;
• a storing unit that stores the unit content data, in response to determining that the unit content data is to be stored;
• and
• a registration message transmission unit that sends a registration message, informing that the received unit content data is stored in the node device, to the administrative node device administrating the content data, in response to storing the unit content data,
• wherein the administrative node device which administrates the content data comprising:
• a message receiving unit that receives the registration message;
• and
• a node information registration unit that registers the node information of the node device that stores the unit content data in response to the received registration message.

A content data storing method in a content data storing and sharing system, the content data storing and sharing system comprising a plurality of node devices including an administrative node device, the plurality of node devices and the administrative node device being connected through a network, the plurality of node devices storing content data to be shared by the plurality of node devices, the administrative node device administrating the content data to be shared by the plurality of node devices and providing node information of the node devices which store the content data in response to a request from the node devices, the method comprising:

• at least one node device in the plurality of node devices performing steps of:
• determining a broadcast channel randomly, the content data to be stored being broadcasted in the broadcast channel:
• receiving the content data broadcasted in the determined broadcast channel;
• determining randomly whether unit content data corresponding to a predetermined amount of the content data is stored, in response to receiving the unit content data which is broadcasted in the determined broadcast channel;
• storing the unit content data, in response to determining that the unit content data is to be stored;
• and
• sending a registration message, informing that the received unit content data is stored in the node device, to the administrative node device administrating the content data, in response to storing the unit content data.