JOAFIP(javadataobjectpersistenceinfile)使得你可以使用文件系统来保存数据对象，而不是数据库。
主要特点：
easytouseguaranteesallACIDpropertiesobjectoriented,writeyourmodel,storeit.Donotneedquerylanguage,justenavigateinyourmodel.multidataaccesssession(multi-Thread,transactionaldatastore)save allobjectsofobjectgraphstartingfromarootobjecttofilesystem,oneheapfilerecordbyobjectinstancelazyloadingofobject:makeabletonotwastememorywithlargeobjectgraphwhenonlyneedtoaccesstosomeofthem.managemoreobjectthanmemorycancontainsaboutproxyforlazyloadmanageenumstatepersistencecrashsafe,mayacceptJVMstopatanytimeevenifwriteinfile(onlythelastcommitislost)filecorruptiondetectiongarbagecollectorforfiledatarecordthatwillneverbeaccessedTheobject thatcanbepersitedarePOJOthatnotneedstoimplementSerializable,butthereissome conditionsPossibilitytostoreserializationof instanceofclassinonedatarecord.canbecomprerssedornot
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