| /* |
| * 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; |
| } |
| } |