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/*
* ============LICENSE_START=======================================================
* ONAP : DCAE
* ================================================================================
* Copyright 2018 TechMahindra
*=================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*/
package org.onap.universalvesadapter.utils;
import java.util.ArrayList;
import java.util.Collection;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
/**
*
* Utility class to execute parallel tasks
*
* @author kmalbari
*
*/
public class ParallelTasks
{
private final Collection<Runnable> tasks = new ArrayList<Runnable>();
public ParallelTasks()
{
}
/**
*
* Add task to be executed in parallel
*
* @param task
*/
public void add(final Runnable task)
{
tasks.add(task);
}
/**
* starts all the added tasks in parallel
*
* @throws InterruptedException
*/
public void startParallelTasks() throws InterruptedException
{
final ExecutorService threads = Executors.newFixedThreadPool(Runtime.getRuntime()
.availableProcessors());
try
{
final CountDownLatch latch = new CountDownLatch(tasks.size());
for (final Runnable task : tasks)
threads.execute(new Runnable() {
public void run()
{
try
{
task.run();
}
finally
{
latch.countDown();
}
}
});
latch.await();
}
finally
{
threads.shutdown();
}
}
}
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