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/*
* Copyright (c) 2012, 2015 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.net4j.util.lifecycle;
import java.util.concurrent.atomic.AtomicInteger;
/**
* A {@link Lifecycle lifecycle} entity with a reference count that can be {@link #activate() activated} multiple times.
*
* @author Eike Stepper
* @since 3.3
*/
public class ShareableLifecycle extends Lifecycle
{
AtomicInteger refCount;
public ShareableLifecycle()
{
this(true);
}
public ShareableLifecycle(boolean shared)
{
if (shared)
{
refCount = new AtomicInteger();
}
}
@Override
void internalActivate() throws LifecycleException
{
if (refCount == null || refCount.getAndIncrement() == 0)
{
super.internalActivate();
}
}
@Override
Exception internalDeactivate()
{
if (refCount == null || refCount.decrementAndGet() == 0)
{
return super.internalDeactivate();
}
return null;
}
}
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