xref: /external/apache-harmony/luni/src/test/api/common/org/apache/harmony/luni/tests/java/lang/ref/ReferenceQueueTest.java

/*
 *  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.harmony.luni.tests.java.lang.ref;

import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.SoftReference;

public class ReferenceQueueTest extends junit.framework.TestCase {
	static Boolean b;

	static Integer integer;

	protected void doneSuite() {
		b = null;
		integer = null;
	}

	public class ChildThread implements Runnable {
		public ChildThread() {
		}

		public void run() {
			try {
				rq.wait(1000);
			} catch (Exception e) {
			}
			synchronized (rq) {
				// store in a static so it won't be gc'ed because the jit
				// optimized it out
				integer = new Integer(667);
				SoftReference sr = new SoftReference(integer, rq);
				sr.enqueue();
				rq.notify();
			}
		}
	}

	ReferenceQueue rq;

	/**
	 * @tests java.lang.ref.ReferenceQueue#poll()
	 */
	public void test_poll() {
		// store in a static so it won't be gc'ed because the jit
		// optimized it out
		b = new Boolean(true);
		SoftReference sr = new SoftReference(b, rq);
		sr.enqueue();
                assertTrue("Remove failed.", ((Boolean) rq.poll().get())
                                .booleanValue());
	}

	/**
	 * @tests java.lang.ref.ReferenceQueue#remove()
	 */
	public void test_remove() throws Exception {
		// store in a static so it won't be gc'ed because the jit
		// optimized it out
		b = new Boolean(true);
		SoftReference sr = new SoftReference(b, rq);
		sr.enqueue();
                assertTrue("Remove failed.", ((Boolean) rq.remove().get())
                                .booleanValue());
	}

	/**
	 * @tests java.lang.ref.ReferenceQueue#remove(long)
	 */
	public void test_removeJ() throws Exception {
                assertNull("Queue is empty.", rq.poll());
                assertNull("Queue is empty.", rq.remove((long) 1));
                Thread ct = new Thread(new ChildThread());
                ct.start();
                Reference ret = rq.remove(0L);
                assertNotNull("Delayed remove failed.", ret);
	}

	/**
	 * @tests java.lang.ref.ReferenceQueue#ReferenceQueue()
	 */
	public void test_Constructor() {
		assertTrue("Used for testing.", true);
	}

	protected void setUp() {
		rq = new ReferenceQueue();
	}

	protected void tearDown() {
	}
}