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CoreStateDownloaderService.java
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CoreStateDownloaderService.java
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/*
* Copyright (c) 2002-2017 "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.causalclustering.core.state.snapshot;
import org.neo4j.causalclustering.core.consensus.LeaderLocator;
import org.neo4j.causalclustering.core.state.CommandApplicationProcess;
import org.neo4j.kernel.impl.util.JobScheduler;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;
import static org.neo4j.kernel.impl.util.JobScheduler.SchedulingStrategy.POOLED;
public class CoreStateDownloaderService
{
static final String OPERATION_NAME = "download of snapshot";
private final JobScheduler jobScheduler;
private final CoreStateDownloader downloader;
private final CommandApplicationProcess applicationProcess;
private final Log log;
private PersistentSnapshotDownloader currentJob = null;
private final JobScheduler.Group downloadSnapshotGroup;
public CoreStateDownloaderService( JobScheduler jobScheduler, CoreStateDownloader downloader,
CommandApplicationProcess applicationProcess,
LogProvider logProvider )
{
this.jobScheduler = jobScheduler;
this.downloader = downloader;
this.applicationProcess = applicationProcess;
this.log = logProvider.getLog( getClass() );
this.downloadSnapshotGroup = new JobScheduler.Group( "download snapshot", POOLED );
}
public void scheduleDownload( LeaderLocator leaderLocator )
{
if ( currentJob == null || currentJob.hasCompleted() )
{
synchronized ( this )
{
if ( currentJob == null || currentJob.hasCompleted() )
{
currentJob = new PersistentSnapshotDownloader( leaderLocator, applicationProcess, downloader, log );
jobScheduler.schedule( downloadSnapshotGroup, currentJob );
}
}
}
}
}