WeakCollectionTest.java

/******************************************************************************
 * Copyright (c) 2006, 2010 VMware Inc.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Apache License v2.0 which accompanies this distribution. 
 * The Eclipse Public License is available at 
 * http://www.eclipse.org/legal/epl-v10.html and the Apache License v2.0
 * is available at http://www.opensource.org/licenses/apache2.0.php.
 * You may elect to redistribute this code under either of these licenses. 
 * 
 * Contributors:
 *   VMware Inc.
 *****************************************************************************/

package org.eclipse.gemini.blueprint.internal.service.collection;

import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.WeakHashMap;

import junit.framework.TestCase;

import org.eclipse.gemini.blueprint.GCTests;

/**
 * @author Costin Leau
 * 
 */
public class WeakCollectionTest extends TestCase {

	public void testWeakList() {
		List list = new ArrayList();

		// add some weak references
		for (int i = 0; i < 20; i++) {
			list.add(new WeakReference(new Object()));
		}

		GCTests.assertGCed(new WeakReference(new Object()));
		for (int i = 0; i < list.size(); i++) {
			assertNull(((WeakReference) list.get(i)).get());

		}
	}

	public void testWeakHashMap() {
		Map weakMap = new WeakHashMap();

		for (int i = 0; i < 10; i++) {
			weakMap.put(new Object(), null);
		}

		GCTests.assertGCed(new WeakReference(new Object()));

		Set entries = weakMap.entrySet();
		
		for (Iterator iter = entries.iterator(); iter.hasNext();) {
			Map.Entry entry = (Map.Entry) iter.next();
			assertNull(entry.getKey());
		}

	}
}