Id generation service

[tshemsedinov]

Globalstorage Id generation service is a task generating Ids in advance and API to get generated Ids. Task will start on idle after application call API to get Id. Underlying database have table Identifier containing all Ids and its main parameters including field Family = Enum(...entity families...).key('Preallocated').

For example, task have configurable MINIMAL_PREALLOCATED (default 1000) and GENERATE_BUNCH (default 200) and current number of prepared records in Identifier marked as Preallocated is 980, somebody get a bunch of 10 identifiers, after that generation service should generate 200 records so number of preallocated will be: 1004 - 10 + 200 = 1194