/**
 * 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.activemq.bugs;

import java.net.URI;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

import javax.jms.*;

import junit.framework.TestCase;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.advisory.ConsumerEvent;
import org.apache.activemq.advisory.ConsumerEventSource;
import org.apache.activemq.advisory.ConsumerListener;
import org.apache.activemq.broker.BrokerFactory;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class AMQ2764Test extends TestCase {

    private static final Log LOG = LogFactory.getLog(AMQ2764Test.class);

    private BrokerService brokerOne;
    private BrokerService brokerTwo;
    private Destination destination;
    private ArrayList<Connection> connections = new ArrayList<Connection>();

    public void testInactivityMonitor() throws Exception {

        startBrokerTwo();
        brokerTwo.waitUntilStarted();

        startBrokerOne();
        brokerOne.waitUntilStarted();

        Thread.sleep(2000);

        ActiveMQConnectionFactory secondProducerConnectionFactory = createBrokerTwoHttpConnectionFactory();
        ActiveMQConnectionFactory consumerConnectionFactory = createBrokerOneHttpConnectionFactory();

        MessageConsumer consumer = createConsumer(consumerConnectionFactory);
        AtomicInteger counter = createConsumerCounter(consumerConnectionFactory);
        waitForConsumerToArrive(counter);

        Connection connection = secondProducerConnectionFactory.createConnection();
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        MessageProducer producer = session.createProducer(destination);
        producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);


        final int expectedMessagesReceived = 2000;

        for (int i = 0; i < expectedMessagesReceived; i++) {
            Message message = session.createMessage();
            producer.send(message);            
            LOG.info("sent message " + i);
        }

        for (int i = 0; i < expectedMessagesReceived; i++) {
            Message message = consumer.receive(2000);
            if (message == null) {
                fail("Didn't receive a message");
            }
            LOG.info("received message " + i);
        }


    }

    public void testBrokerRestart() throws Exception {

        startBrokerTwo();
        brokerTwo.waitUntilStarted();        

        startBrokerOne();
        brokerOne.waitUntilStarted();

        Thread.sleep(5000);

        ActiveMQConnectionFactory producerConnectionFactory = createBrokerOneConnectionFactory();
        ActiveMQConnectionFactory secondProducerConnectionFactory = createBrokerTwoConnectionFactory();
        ActiveMQConnectionFactory consumerConnectionFactory = createBrokerOneConnectionFactory();

        MessageConsumer consumer = createConsumer(consumerConnectionFactory);
        AtomicInteger counter = createConsumerCounter(consumerConnectionFactory);
        waitForConsumerToArrive(counter);

        final int expectedMessagesReceived = 25;
        int actualMessagesReceived = doSendMessage(expectedMessagesReceived, consumer, producerConnectionFactory);
        assertEquals("Didn't receive the right amount of messages directly connected", expectedMessagesReceived, actualMessagesReceived);
        assertNull( "Had extra messages", consumer.receiveNoWait());

        actualMessagesReceived = doSendMessage(expectedMessagesReceived, consumer, secondProducerConnectionFactory);
        assertEquals("Didn't receive the right amount of messages via network", expectedMessagesReceived, actualMessagesReceived);
        assertNull( "Had extra messages", consumer.receiveNoWait());

        LOG.info("Stopping broker one");
        stopBrokerOne();

        TimeUnit.SECONDS.sleep(1);
        LOG.info("Restarting broker");
        startBrokerOne();

        consumer = createConsumer(consumerConnectionFactory);
        counter = createConsumerCounter(consumerConnectionFactory);
        waitForConsumerToArrive(counter);

        actualMessagesReceived = doSendMessage(expectedMessagesReceived, consumer, secondProducerConnectionFactory);
        assertEquals("Didn't receive the right amount of messages via network after restart", expectedMessagesReceived, actualMessagesReceived);
        assertNull( "Had extra messages", consumer.receiveNoWait());

        stopBrokerOne();
        stopBrokerTwo();
    }

    protected int doSendMessage(int expectedMessagesReceived, MessageConsumer consumer, ActiveMQConnectionFactory connectionFactory) throws Exception {
        int messagesReceived = 0;
        for (int i=0; i<expectedMessagesReceived; i++) {
            String messageId = sendMessage(connectionFactory);
            Message message = consumer.receive(5000);
            if ( message!=null ) {
                messagesReceived++;
            }
        }
        return messagesReceived;
    }

    protected String sendMessage(ActiveMQConnectionFactory connectionFactory) throws JMSException {
        Connection connection = null;
        try {
            connection = connectionFactory.createConnection();
            Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
            MessageProducer producer = session.createProducer(destination);
            Message message = session.createMessage();
            producer.send(message);
            return message.getJMSMessageID();
        } finally {
            try {
                connection.close();
            } catch (Throwable ignore) {
            }
        }
    }

    protected BrokerService createFirstBroker() throws Exception {
        return BrokerFactory.createBroker(new URI("xbean:org/apache/activemq/bugs/amq2764/reconnect-broker1.xml"));
    }

    protected BrokerService createSecondBroker() throws Exception {
        return BrokerFactory.createBroker(new URI("xbean:org/apache/activemq/bugs/amq2764/reconnect-broker2.xml"));
    }
    
    protected ActiveMQConnectionFactory createBrokerOneConnectionFactory() {
        return new ActiveMQConnectionFactory("vm://broker1");
    }

    protected ActiveMQConnectionFactory createBrokerTwoConnectionFactory() {
        return new ActiveMQConnectionFactory("vm://broker2");
    }

    protected ActiveMQConnectionFactory createBrokerOneHttpConnectionFactory() {
        return new ActiveMQConnectionFactory("http://localhost:61616");
    }

    protected ActiveMQConnectionFactory createBrokerTwoHttpConnectionFactory() {
        return new ActiveMQConnectionFactory("http://localhost:61617");
    }

    protected void setUp() throws Exception {

        LOG.info("===============================================================================");
        LOG.info("Running Test Case: " + getName());
        LOG.info("===============================================================================");

        destination = new ActiveMQQueue("RECONNECT.TEST.QUEUE");

    }

    protected void tearDown() throws Exception {
        disposeConsumerConnections();
        try {
            stopBrokerOne();
        } catch (Throwable e) {
        }
        try {
            stopBrokerTwo();
        } catch (Throwable e) {
        }
    }

    protected void disposeConsumerConnections() {
        for (Iterator<Connection> iter = connections.iterator(); iter.hasNext();) {
            Connection connection = iter.next();
            try {
                connection.close();
            } catch (Throwable ignore) {
            }
        }
    }

    protected void startBrokerOne() throws Exception {
        if (brokerOne == null) {
            brokerOne = createFirstBroker();
            brokerOne.start();
        }
    }

    protected void stopBrokerOne() throws Exception {
        if (brokerOne != null) {
            brokerOne.stop();
            brokerOne = null;
        }
    }

    protected void startBrokerTwo() throws Exception {
        if (brokerTwo == null) {
            brokerTwo = createSecondBroker();
            brokerTwo.start();
        }
    }

    protected void stopBrokerTwo() throws Exception {
        if (brokerTwo != null) {
            brokerTwo.stop();
            brokerTwo = null;
        }
    }

    protected MessageConsumer createConsumer(ActiveMQConnectionFactory consumerConnectionFactory) throws JMSException {
        Connection connection = consumerConnectionFactory.createConnection();
        connections.add(connection);
        connection.start();

        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        return session.createConsumer(destination);
    }

    protected AtomicInteger createConsumerCounter(ActiveMQConnectionFactory cf) throws Exception {
        final AtomicInteger rc = new AtomicInteger(0);
        Connection connection = cf.createConnection();
        connections.add(connection);
        connection.start();

        ConsumerEventSource source = new ConsumerEventSource(connection, destination);
        source.setConsumerListener(new ConsumerListener() {
            public void onConsumerEvent(ConsumerEvent event) {
                rc.set(event.getConsumerCount());
            }
        });
        source.start();

        return rc;
    }

    protected void waitForConsumerToArrive(AtomicInteger consumerCounter) throws InterruptedException {
        for (int i = 0; i < 100; i++) {
            if (consumerCounter.get() > 0) {
                return;
            }
            Thread.sleep(100);
        }
        fail("The consumer did not arrive.");
    }

    protected void waitForConsumerToLeave(AtomicInteger consumerCounter) throws InterruptedException {
        for (int i = 0; i < 100; i++) {
            if (consumerCounter.get() == 0) {
                return;
            }
            Thread.sleep(100);
        }
        fail("The consumer did not leave.");
    }

}

