History storage device, image forming apparatus and non-transitory computer readable medium storing program

An image forming apparatus comprising:

• an image forming part that forms an image on a supplied recording medium;
• and
• a history storage device including:
• a generating unit that generates history information including event information corresponding to an event having occurred and accompanying information accompanying the event information;
• a storage unit that, in storing first history information in a storage region, when event information included in the first history information is the event information included in second history information having already been stored in the storage region, does not store the event information included in the first history information and stores, the accompanying information included in the first history information in a region corresponding to the event information included in the first history information within the storage region;
• and
• a reconstruction unit that, in reading out the first history information from the storage region, based on the region in which the accompanying information included in the first history information has been stored, associates the event information with the accompanying information included in the first history information, to reconstruct the first history information.

A non-transitory computer readable medium storing a program that causes a computer to execute a process comprising:

• generating history information including event information corresponding to an event having occurred and accompanying information accompanying the event information;
• in storing first history information in a storage region, when event information included in the first history information is the event information included in second history information having already been stored in the storage region, not storing the event information included in the first history information and storing the accompanying information included in the first history information in a region corresponding to the event information included in the first history information within the storage region;
• and
• in reading out the first history information from the storage region, based on the region in which the accompanying information included in the first history information has been stored, associating the event information with the accompanying information included in the first history information, to reconstruct the first history information.