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BufferedIdController.java
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BufferedIdController.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 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.impl.storageengine.impl.recordstorage.id;
import java.util.concurrent.TimeUnit;
import java.util.function.Supplier;
import org.neo4j.kernel.impl.api.KernelTransactionsSnapshot;
import org.neo4j.kernel.impl.store.id.BufferingIdGeneratorFactory;
import org.neo4j.kernel.lifecycle.LifecycleAdapter;
import org.neo4j.scheduler.JobScheduler;
/**
* Storage id controller that provide buffering possibilities to be able so safely free and reuse ids.
* Allows perform clear and maintenance operations over currently buffered set of ids.
* @see BufferingIdGeneratorFactory
*/
public class BufferedIdController extends LifecycleAdapter implements IdController
{
private final BufferingIdGeneratorFactory bufferingIdGeneratorFactory;
private final JobScheduler scheduler;
private JobScheduler.JobHandle jobHandle;
public BufferedIdController( BufferingIdGeneratorFactory bufferingIdGeneratorFactory, JobScheduler scheduler )
{
this.bufferingIdGeneratorFactory = bufferingIdGeneratorFactory;
this.scheduler = scheduler;
}
@Override
public void start() throws Throwable
{
jobHandle = scheduler.scheduleRecurring( JobScheduler.Groups.storageMaintenance, this::maintenance, 1,
TimeUnit.SECONDS );
}
@Override
public void stop() throws Throwable
{
jobHandle.cancel( false );
}
@Override
public void clear()
{
bufferingIdGeneratorFactory.clear();
}
@Override
public void maintenance()
{
bufferingIdGeneratorFactory.maintenance();
}
@Override
public void initialize( Supplier<KernelTransactionsSnapshot> transactionsSnapshotSupplier )
{
bufferingIdGeneratorFactory.initialize( transactionsSnapshotSupplier );
}
}