/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jena.rdf.model.test;
import org.apache.jena.rdf.model.Model ;
import org.apache.jena.rdf.model.test.helpers.TestingModelFactory ;
import org.apache.jena.shared.Lock ;
import org.junit.Assert;
/**
* Parallel concurrency tests.
*/
public class TestConcurrencyParallel extends AbstractModelTestBase
{
class Operation extends Thread
{
Model lockModel;
boolean readLock;
Operation( final Model m, final boolean withReadLock )
{
lockModel = m;
readLock = withReadLock;
}
@Override
public void run()
{
for (int i = 0; i < 2; i++)
{
try
{
lockModel.enterCriticalSection(readLock);
if (readLock)
readOperation(false);
else
writeOperation(false);
}
finally
{
lockModel.leaveCriticalSection();
}
}
}
}
// Operations ----------------------------------------------
long SLEEP = 100;
int threadTotal = 10;
int threadCount = 0;
volatile int writers = 0;
public TestConcurrencyParallel( final TestingModelFactory modelFactory,
final String name )
{
super(modelFactory, name);
}
// The example model operations
void doStuff( final String label, final boolean doThrow )
{
Thread.currentThread().getName();
// Puase a while to cause other threads to (try to) enter the region.
try
{
Thread.sleep(SLEEP);
}
catch (final InterruptedException intEx)
{
}
if (doThrow)
{
throw new RuntimeException(label);
}
}
public void readOperation( final boolean doThrow )
{
if (writers > 0)
{
System.err.println("Concurrency error: writers around!");
}
doStuff("read operation", false);
if (writers > 0)
{
System.err.println("Concurrency error: writers around!");
}
}
// Example operations
public void testParallel()
{
final Thread threads[] = new Thread[threadTotal];
boolean getReadLock = Lock.READ;
for (int i = 0; i < threadTotal; i++)
{
final String nextId = "T" + Integer.toString(++threadCount);
threads[i] = new Operation(model, getReadLock);
threads[i].setName(nextId);
threads[i].start();
getReadLock = !getReadLock;
}
boolean problems = false;
for (int i = 0; i < threadTotal; i++)
{
try
{
threads[i].join(200 * SLEEP);
}
catch (final InterruptedException intEx)
{
}
}
// Try again for any we missed.
for (int i = 0; i < threadTotal; i++)
{
if (threads[i].isAlive())
{
try
{
threads[i].join(200 * SLEEP);
}
catch (final InterruptedException intEx)
{
}
}
if (threads[i].isAlive())
{
System.out.println("Thread " + threads[i].getName()
+ " failed to finish");
problems = true;
}
}
Assert.assertTrue("Some thread failed to finish", !problems);
}
public void writeOperation( final boolean doThrow )
{
writers++;
doStuff("write operation", false);
writers--;
}
}