question: public boolean cancelJob ( long id , boolean isPersistent ) { JobHolder holder ; synchronized ( getNextJobLock ) { if ( jobConsumerExecutor . isRunning ( id , isPersistent ) ) return false ; if ( isPersistent ) { synchronized ( persistentJobQueue ) { holder = persistentJobQueue . findJobById ( id ) ; if ( holder == null ) return false ; persistentJobQueue . remove ( holder ) ; } } else { synchronized ( nonPersistentJobQueue ) { holder = nonPersistentJobQueue . findJobById ( id ) ; if ( holder == null ) return false ; nonPersistentJobQueue . remove ( holder ) ; } } } BaseJob baseJob = holder . getBaseJob ( ) ; if ( dependencyInjector != null ) { dependencyInjector . inject ( baseJob ) ; } baseJob . onCancel ( ) ; return true ; }
target:  Cancels job which is waiting to be run.