implement jbpm key generation ----------------------------- Key: JBPM-2526 URL: https://jira.jboss.org/jira/browse/JBPM-2526 Project: jBPM Issue Type: Task Security Level: Public(Everyone can see) Reporter: Tom Baeyens Assignee: Tom Baeyens Priority: Critical Fix For: jBPM 4.2 mechanism: 1) add JBPM4_PROPERTIES table (See also JBPM-2527) 2) define a property called NEXTID with a long value that is initialized at 1 3) define a KeyGeneratorImpl in the process-engine context, with eager initialization 4) make sure that all hibernate entities during construction get a value from the id generator - each id generator will acquire a block of ids by updating the NEXTID property - block acquisition is guarded with optimistic locking - ids will be consumed from the block (very fast, without db access) 5) remove all the explicit flushes 6) implement a DefaultKeyGenerator that only uses in memory key generation in case people work without persistence public abstract class KeyGenerator { // similar as ScriptManager public static KeyGenerator getKeyGenerator() {...} // similar as ScriptManager public static KeyGenerator getDefaultKeyGenerator() {...} public long getNextId() {...} } Motivations: 1) database portability : see also JBPM-2510 2) performance JBPM-2510