Information processing device, method, and program with session table storing plurality of chains

An information processing method executed by an information processing device in which is implemented a session table, the information processing device including

• a storage unit that stores a session table in which is recorded session information having session content and holding time point of the session, the session table storing a plurality of chains, at least one of the plurality of chains storing session records of a plurality of sessions, each of the session records storing session content and time information for a corresponding one of the plurality of sessions, wherein the time information comprises at least embedded holding time points of the sessions, the information processing method comprising:
• a locking step of locking at least one of the plurality of chains of the session table that is an object of processing, during processing on the session information;
• searching steps of;
• scanning session information of the session table after locking in the locking step,
• searching for session information that is an object of processing;
• and
• confirming the holding time point of the session information to be one of expired or not expired;
• an extending step that, in a case where the session information of which the holding time point has not expired is discovered at the time of scanning by the searching unit, the holding time point is extended and updated in the session table;
• and
• a deleting step where, in a case where the session information of which the holding time point has expired is discovered at the time of scanning in the searching step, the session information of which the holding time point has expired is deleted from the session table.