org.activiti.engine.impl.jobexecutor

Class LockFreeAcquireJobsRunnable

java.lang.Object

org.activiti.engine.impl.jobexecutor.LockFreeAcquireJobsRunnable

All Implemented Interfaces:

Runnable, AcquireJobsRunnable

public class LockFreeAcquireJobsRunnable
extends Object
implements AcquireJobsRunnable

AcquireJobsRunnable implementation with sole purpose of 'acquiring' jobs, which means setting the current job executor name into the lock owner colum to 'acquire' it. Later on, these jobs will be fetched and put on the work queue.

Author:

jbarrez

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	isInterrupted Flag to indicate the runnable was interrupted
protected boolean	isJobAdded Flag to indicate a job was added (used when the runnable was sleeping, but a job was created by the engine)
protected AtomicBoolean	isWaiting Flag to indicate whether the runnable is currently waiting.
protected LockFreeJobExecutor	jobExecutor The job executor.
protected Object	MONITOR Monitor object to synchronize on.

Constructor Summary

Constructors

Constructor and Description
LockFreeAcquireJobsRunnable(LockFreeJobExecutor jobExecutor)

Method Summary

Methods

Modifier and Type	Method and Description
protected List<JobEntity>	fetchJobs(int start)
void	jobWasAdded() Called by the job executor when a new job was added by the process engine to which this job executor belongs.
protected void	putAcquiredJobsOnQueue()
void	run()
protected void	sleep()
void	stop() Called when the job executor is shutting down and the job acquiring needs to be shut down too.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

jobExecutor

protected final LockFreeJobExecutor jobExecutor

The job executor. Only works with the LockFreeJobExecutor implementation

isInterrupted

protected volatile boolean isInterrupted

Flag to indicate the runnable was interrupted

isJobAdded

protected volatile boolean isJobAdded

Flag to indicate a job was added (used when the runnable was sleeping, but a job was created by the engine)

MONITOR

protected final Object MONITOR

Monitor object to synchronize on.

isWaiting

protected final AtomicBoolean isWaiting

Flag to indicate whether the runnable is currently waiting.

Constructor Detail

LockFreeAcquireJobsRunnable

public LockFreeAcquireJobsRunnable(LockFreeJobExecutor jobExecutor)

Method Detail

run

public void run()

Specified by:

run in interface Runnable

sleep

protected void sleep()

putAcquiredJobsOnQueue

protected void putAcquiredJobsOnQueue()

fetchJobs

protected List<JobEntity> fetchJobs(int start)

stop

public void stop()

Description copied from interface: AcquireJobsRunnable

Called when the job executor is shutting down and the job acquiring needs to be shut down too.

Specified by:

stop in interface AcquireJobsRunnable

jobWasAdded

public void jobWasAdded()

Description copied from interface: AcquireJobsRunnable

Called by the job executor when a new job was added by the process engine to which this job executor belongs. This is a hint, that for example the acquiring needs to start again when it would be sleeping.

Specified by:

jobWasAdded in interface AcquireJobsRunnable