/*
 * 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.integration.jmx;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;

import java.util.concurrent.atomic.AtomicInteger;

import javax.management.MBeanServer;

import org.junit.Before;
import org.junit.Test;

import org.springframework.messaging.Message;
import org.springframework.jmx.support.MBeanServerFactoryBean;
import org.springframework.jmx.support.ObjectNameManager;

/**
 * @author Mark Fisher
 * @since 2.0
 */
public class AttributePollingMessageSourceTests {

	private final TestCounter counter = new TestCounter();

	private volatile MBeanServer server;


	@Before
	public void setup() throws Exception {
		MBeanServerFactoryBean factoryBean = new MBeanServerFactoryBean();
		factoryBean.setLocateExistingServerIfPossible(true);
		factoryBean.afterPropertiesSet();
		this.server = factoryBean.getObject();
		this.server.registerMBean(this.counter, ObjectNameManager.getInstance("test:name=counter"));
	}


	@Test
	public void basicPolling() {
		AttributePollingMessageSource source = new AttributePollingMessageSource();
		source.setAttributeName("Count");
		source.setObjectName("test:name=counter");
		source.setServer(this.server);
		Message<?> message1 = source.receive();
		assertNotNull(message1);
		assertEquals(0, message1.getPayload());
		this.counter.increment();
		Message<?> message2 = source.receive();
		assertNotNull(message2);
		assertEquals(1, message2.getPayload());
	}


	public interface TestCounterMBean {
		int getCount();
	}


	public static class TestCounter implements TestCounterMBean {

		private final AtomicInteger counter = new AtomicInteger();

		public int getCount() {
			return this.counter.get();
		}

		public void increment() {
			this.counter.incrementAndGet();
		}
	}

}