Commit 98a0c2f8032f49178e9a048d4139e4d0af66c594 in isis's branch refs/heads/
ISIS-1291 from Dan Haywood
[ https://git-wip-us.apache.org/repos/asf?p=isis.git;h=98a0c2f ]
ISIS-1390: default CommandServiceDefault. Also simplifying the relationship between IsisTransaction and Command, and how the Command object is initialized.
... deprecating CommandService#startTransaction(...), make it the responsibility of IsisTransactionManager to populate the transactionId of the Command in all cases.
... simplifying logic in IsisTransaction; the Command is only just created, so will never have a transactionId to reuse. The design is now simply for the IsisTransactionManager to create a new UUID and set on both the Command and also pass into IsisTransaction.
... extend IsisTranscationManager's executeWithTransaction to allow an existing Command to be passed in; leverage this from BackgroundCommandExecution.
... use ClockService to obtain the time, rather than Clock singleton (for Command#setTimestamp, also Command#setStartedAt,
... make lookup of mandatory services fail-fast if not present (PropertySetterFacet, ActionInvocationFacet, IsisTransactionManager, IsisTransaction)
... minor alterations to visibility of DomainObjectJdoAbstract properties in tables.