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ContinuousJob.java
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ContinuousJob.java
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/*
* Copyright (c) 2002-2016 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.coreedge.core.consensus;
import org.neo4j.kernel.impl.util.JobScheduler;
import org.neo4j.kernel.lifecycle.LifecycleAdapter;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;
/**
* Invokes the supplied task continuously when started. The supplied task
* should be short since the abort flag is checked in between invocations.
*/
public class ContinuousJob extends LifecycleAdapter
{
private final AbortableJob abortableJob = new AbortableJob();
private final JobScheduler scheduler;
private final JobScheduler.Group group;
private final Runnable task;
private final Log log;
private JobScheduler.JobHandle jobHandle;
public ContinuousJob( JobScheduler scheduler, JobScheduler.Group group, Runnable task, LogProvider logProvider )
{
this.scheduler = scheduler;
this.group = group;
this.task = task;
this.log = logProvider.getLog( getClass() );
}
@Override
public void start() throws Throwable
{
abortableJob.keepRunning = true;
jobHandle = scheduler.schedule( group, abortableJob );
}
@Override
public void stop() throws Throwable
{
log.info( "ContinuousJob " + group.name() + " stopping" );
abortableJob.keepRunning = false;
jobHandle.waitTermination();
}
private class AbortableJob implements Runnable
{
private volatile boolean keepRunning;
@Override
public void run()
{
while ( keepRunning )
{
task.run();
}
}
}
}