/*
 * Copyright 2002-2016 the original author or authors.
 *
 * 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.
 */

package org.springframework.amqp.rabbit.listener;

import static org.junit.Assert.assertEquals;

import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

import org.junit.Test;


/**
 * @author Dave Syer
 * @author Gary Russell
 *
 */
public class ActiveObjectCounterTests {

	private final ActiveObjectCounter<Object> counter = new ActiveObjectCounter<Object>();

	@Test
	public void testActiveCount() throws Exception {
		final Object object1 = new Object();
		final Object object2 = new Object();
		counter.add(object1);
		counter.add(object2);
		assertEquals(2, counter.getCount());
		counter.release(object2);
		assertEquals(1, counter.getCount());
		counter.release(object1);
		counter.release(object1);
		assertEquals(0, counter.getCount());
	}

	@Test
	public void testWaitForLocks() throws Exception {
		final Object object1 = new Object();
		final Object object2 = new Object();
		counter.add(object1);
		counter.add(object2);
		Future<Boolean> future = Executors.newSingleThreadExecutor().submit(() -> {
			counter.release(object1);
			counter.release(object2);
			counter.release(object2);
			return true;
		});
		assertEquals(true, counter.await(1000L, TimeUnit.MILLISECONDS));
		assertEquals(true, future.get());
	}

	@Test
	public void testTimeoutWaitForLocks() throws Exception {
		final Object object1 = new Object();
		counter.add(object1);
		assertEquals(false, counter.await(200L, TimeUnit.MILLISECONDS));
	}

}