/*
 * Copyright 2009-2016 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.monitor;

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

import org.junit.Test;
import org.junit.runner.RunWith;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.integration.support.management.MessageHandlerMetrics;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.MessageDeliveryException;
import org.springframework.messaging.PollableChannel;
import org.springframework.messaging.support.GenericMessage;
import org.springframework.test.annotation.DirtiesContext;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**
 * @author Dave Syer
 * @author Gary Russell
 * @author Artem Bilan
 * @since 2.0
 */
@ContextConfiguration
@RunWith(SpringJUnit4ClassRunner.class)
@DirtiesContext
public class ChannelIntegrationTests {

	@Autowired
	private MessageChannel requests;

	@Autowired
	private PollableChannel intermediate;

	@Autowired
	private PollableChannel sourceChannel;

	@Autowired
	private IntegrationMBeanExporter messageChannelsMonitor;

	@Test
	public void testMessageChannelStatistics() throws Exception {

		requests.send(new GenericMessage<String>("foo"));

		String intermediateChannelName = "" + intermediate;

		assertEquals(1, messageChannelsMonitor.getChannelSendCount(intermediateChannelName));

		double rate = messageChannelsMonitor.getChannelSendRate("" + requests).getMean();
		assertTrue("No statistics for requests channel", rate >= 0);

		rate = messageChannelsMonitor.getChannelSendRate(intermediateChannelName).getMean();
		assertTrue("No statistics for intermediate channel", rate >= 0);

		assertNotNull(intermediate.receive(100L));
		assertEquals(1, messageChannelsMonitor.getChannelReceiveCount(intermediateChannelName));

		requests.send(new GenericMessage<String>("foo"));
		try {
			requests.send(new GenericMessage<String>("foo"));
		}
		catch (MessageDeliveryException e) {
		}

		assertEquals(3, messageChannelsMonitor.getChannelSendCount(intermediateChannelName));

		assertEquals(1, messageChannelsMonitor.getChannelSendErrorCount(intermediateChannelName));

		assertSame(intermediate, messageChannelsMonitor.getChannelMetrics(intermediateChannelName));

		MessageHandlerMetrics handlerMetrics = messageChannelsMonitor.getHandlerMetrics("bridge");

		assertEquals(3, handlerMetrics.getHandleCount());
		assertEquals(1, handlerMetrics.getErrorCount());

		assertNotNull(this.sourceChannel.receive(10000));

		assertTrue(messageChannelsMonitor.getSourceMessageCount("source") > 0);
		assertTrue(messageChannelsMonitor.getSourceMetrics("source").getMessageCount() > 0);

	}

}