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LonelyProcessingStep.java
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LonelyProcessingStep.java
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/*
* Copyright (c) 2002-2018 "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.unsafe.impl.batchimport.staging;
import org.neo4j.unsafe.impl.batchimport.Configuration;
import org.neo4j.unsafe.impl.batchimport.stats.StatsProvider;
import static java.lang.System.nanoTime;
/**
* {@link Step} that doesn't receive batches, doesn't send batches downstream; just processes data.
*/
public abstract class LonelyProcessingStep extends AbstractStep<Void>
{
private final int batchSize;
private int batch;
private long lastProcessingTimestamp;
public LonelyProcessingStep( StageControl control, String name, Configuration config,
StatsProvider... additionalStatsProviders )
{
super( control, name, config, additionalStatsProviders );
this.batchSize = config.batchSize();
}
@Override
public long receive( long ticket, Void nothing )
{
startProcessing( () -> {
assertHealthy();
try
{
try
{
lastProcessingTimestamp = nanoTime();
process();
}
catch ( Throwable e )
{
// we need to update panic state before ending upstream and notifying executor that we completed
issuePanic( e );
}
finally
{
endOfUpstream();
}
}
catch ( Throwable e )
{
// to avoid cases when we hide original panic problem
// check first if we already in panic state and if so - rethrow original panic cause
if ( !isPanic() )
{
issuePanic( e );
}
else
{
throw e;
}
}
} );
return 0;
}
protected void startProcessing( Runnable runnable )
{
new Thread( runnable ).start();
}
/**
* Called once and signals the start of this step. Responsible for calling {@link #progress(long)}
* at least now and then.
*/
protected abstract void process();
/**
* Called from {@link #process()}, reports progress so that statistics are updated appropriately.
*
* @param amount number of items processed since last call to this method.
*/
protected void progress( long amount )
{
batch += amount;
if ( batch >= batchSize )
{
int batches = batch / batchSize;
batch %= batchSize;
doneBatches.addAndGet( batches );
long time = nanoTime();
totalProcessingTime.add( time - lastProcessingTimestamp );
lastProcessingTimestamp = time;
}
}
}