/**
 * 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;

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

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;

import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.command.ActiveMQQueue;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class ExclusiveConsumerTest {

    private static final String VM_BROKER_URL = "vm://localhost";

    private BrokerService brokerService;

    @Before
    public void setUp() throws Exception {
        brokerService = new BrokerService();
        brokerService.setPersistent(false);
        brokerService.setUseJmx(false);
        brokerService.setSchedulerSupport(false);
        brokerService.setAdvisorySupport(false);

        brokerService.start();
    }

    @After
    public void tearDown() throws Exception {
        if (brokerService != null) {
            brokerService.stop();
            brokerService = null;
        }
    }

    private Connection createConnection(final boolean start) throws JMSException {
        ConnectionFactory cf = new ActiveMQConnectionFactory(VM_BROKER_URL);
        Connection conn = cf.createConnection();
        if (start) {
            conn.start();
        }
        return conn;
    }

    @Test(timeout = 60000)
    public void testExclusiveConsumerSelectedCreatedFirst() throws JMSException, InterruptedException {
        Connection conn = createConnection(true);

        Session exclusiveSession = null;
        Session fallbackSession = null;
        Session senderSession = null;

        try {
            exclusiveSession = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
            fallbackSession = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
            senderSession = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);

            ActiveMQQueue exclusiveQueue = new ActiveMQQueue("TEST.QUEUE1?consumer.exclusive=true");
            MessageConsumer exclusiveConsumer = exclusiveSession.createConsumer(exclusiveQueue);

            ActiveMQQueue fallbackQueue = new ActiveMQQueue("TEST.QUEUE1");
            MessageConsumer fallbackConsumer = fallbackSession.createConsumer(fallbackQueue);

            ActiveMQQueue senderQueue = new ActiveMQQueue("TEST.QUEUE1");

            MessageProducer producer = senderSession.createProducer(senderQueue);

            Message msg = senderSession.createTextMessage("test");
            producer.send(msg);
            // TODO need two send a 2nd message - bug AMQ-1024
            // producer.send(msg);
            Thread.sleep(100);

            // Verify exclusive consumer receives the message.
            assertNotNull(exclusiveConsumer.receive(100));
            assertNull(fallbackConsumer.receive(100));
        } finally {
            fallbackSession.close();
            senderSession.close();
            conn.close();
        }
    }

    @Test(timeout = 60000)
    public void testExclusiveConsumerSelectedCreatedAfter() throws JMSException, InterruptedException {
        Connection conn = createConnection(true);

        Session exclusiveSession = null;
        Session fallbackSession = null;
        Session senderSession = null;

        try {
            exclusiveSession = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
            fallbackSession = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
            senderSession = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);

            ActiveMQQueue fallbackQueue = new ActiveMQQueue("TEST.QUEUE5");
            MessageConsumer fallbackConsumer = fallbackSession.createConsumer(fallbackQueue);

            ActiveMQQueue exclusiveQueue = new ActiveMQQueue("TEST.QUEUE5?consumer.exclusive=true");
            MessageConsumer exclusiveConsumer = exclusiveSession.createConsumer(exclusiveQueue);

            ActiveMQQueue senderQueue = new ActiveMQQueue("TEST.QUEUE5");

            MessageProducer producer = senderSession.createProducer(senderQueue);

            Message msg = senderSession.createTextMessage("test");
            producer.send(msg);
            Thread.sleep(100);

            // Verify exclusive consumer receives the message.
            assertNotNull(exclusiveConsumer.receive(100));
            assertNull(fallbackConsumer.receive(100));

        } finally {
            fallbackSession.close();
            senderSession.close();
            conn.close();
        }
    }

    @Test(timeout = 60000)
    public void testFailoverToAnotherExclusiveConsumerCreatedFirst() throws JMSException, InterruptedException {
        Connection conn = createConnection(true);

        Session exclusiveSession1 = null;
        Session exclusiveSession2 = null;
        Session fallbackSession = null;
        Session senderSession = null;

        try {
            exclusiveSession1 = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
            exclusiveSession2 = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
            fallbackSession = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
            senderSession = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);

            // This creates the exclusive consumer first which avoids AMQ-1024 bug.
            ActiveMQQueue exclusiveQueue = new ActiveMQQueue("TEST.QUEUE2?consumer.exclusive=true");
            MessageConsumer exclusiveConsumer1 = exclusiveSession1.createConsumer(exclusiveQueue);
            MessageConsumer exclusiveConsumer2 = exclusiveSession2.createConsumer(exclusiveQueue);

            ActiveMQQueue fallbackQueue = new ActiveMQQueue("TEST.QUEUE2");
            MessageConsumer fallbackConsumer = fallbackSession.createConsumer(fallbackQueue);

            ActiveMQQueue senderQueue = new ActiveMQQueue("TEST.QUEUE2");

            MessageProducer producer = senderSession.createProducer(senderQueue);

            Message msg = senderSession.createTextMessage("test");
            producer.send(msg);
            Thread.sleep(100);

            // Verify exclusive consumer receives the message.
            assertNotNull(exclusiveConsumer1.receive(100));
            assertNull(exclusiveConsumer2.receive(100));
            assertNull(fallbackConsumer.receive(100));

            // Close the exclusive consumer to verify the non-exclusive consumer takes over
            exclusiveConsumer1.close();

            producer.send(msg);
            producer.send(msg);

            assertNotNull(exclusiveConsumer2.receive(100));
            assertNull(fallbackConsumer.receive(100));

        } finally {
            fallbackSession.close();
            senderSession.close();
            conn.close();
        }
    }

    @Test(timeout = 60000)
    public void testFailoverToAnotherExclusiveConsumerCreatedAfter() throws JMSException, InterruptedException {
        Connection conn = createConnection(true);

        Session exclusiveSession1 = null;
        Session exclusiveSession2 = null;
        Session fallbackSession = null;
        Session senderSession = null;

        try {
            exclusiveSession1 = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
            exclusiveSession2 = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
            fallbackSession = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
            senderSession = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);

            // This creates the exclusive consumer first which avoids AMQ-1024 bug.
            ActiveMQQueue exclusiveQueue = new ActiveMQQueue("TEST.QUEUE6?consumer.exclusive=true");
            MessageConsumer exclusiveConsumer1 = exclusiveSession1.createConsumer(exclusiveQueue);

            ActiveMQQueue fallbackQueue = new ActiveMQQueue("TEST.QUEUE6");
            MessageConsumer fallbackConsumer = fallbackSession.createConsumer(fallbackQueue);

            MessageConsumer exclusiveConsumer2 = exclusiveSession2.createConsumer(exclusiveQueue);

            ActiveMQQueue senderQueue = new ActiveMQQueue("TEST.QUEUE6");

            MessageProducer producer = senderSession.createProducer(senderQueue);

            Message msg = senderSession.createTextMessage("test");
            producer.send(msg);
            Thread.sleep(100);

            // Verify exclusive consumer receives the message.
            assertNotNull(exclusiveConsumer1.receive(100));
            assertNull(exclusiveConsumer2.receive(100));
            assertNull(fallbackConsumer.receive(100));

            // Close the exclusive consumer to verify the non-exclusive consumer takes over
            exclusiveConsumer1.close();

            producer.send(msg);
            producer.send(msg);

            assertNotNull(exclusiveConsumer2.receive(1000));
            assertNull(fallbackConsumer.receive(100));
        } finally {
            fallbackSession.close();
            senderSession.close();
            conn.close();
        }
    }

    @Test(timeout = 60000)
    public void testFailoverToNonExclusiveConsumer() throws JMSException, InterruptedException {
        Connection conn = createConnection(true);

        Session exclusiveSession = null;
        Session fallbackSession = null;
        Session senderSession = null;

        try {

            exclusiveSession = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
            fallbackSession = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
            senderSession = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);

            // This creates the exclusive consumer first which avoids AMQ-1024 bug.
            ActiveMQQueue exclusiveQueue = new ActiveMQQueue("TEST.QUEUE3?consumer.exclusive=true");
            MessageConsumer exclusiveConsumer = exclusiveSession.createConsumer(exclusiveQueue);

            ActiveMQQueue fallbackQueue = new ActiveMQQueue("TEST.QUEUE3");
            MessageConsumer fallbackConsumer = fallbackSession.createConsumer(fallbackQueue);

            ActiveMQQueue senderQueue = new ActiveMQQueue("TEST.QUEUE3");

            MessageProducer producer = senderSession.createProducer(senderQueue);

            Message msg = senderSession.createTextMessage("test");
            producer.send(msg);
            Thread.sleep(100);

            // Verify exclusive consumer receives the message.
            assertNotNull(exclusiveConsumer.receive(100));
            assertNull(fallbackConsumer.receive(100));

            // Close the exclusive consumer to verify the non-exclusive consumer takes over
            exclusiveConsumer.close();

            producer.send(msg);

            assertNotNull(fallbackConsumer.receive(100));
        } finally {
            fallbackSession.close();
            senderSession.close();
            conn.close();
        }
    }

    @Test(timeout = 60000)
    public void testFallbackToExclusiveConsumer() throws JMSException, InterruptedException {
        Connection conn = createConnection(true);

        Session exclusiveSession = null;
        Session fallbackSession = null;
        Session senderSession = null;

        try {

            exclusiveSession = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
            fallbackSession = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
            senderSession = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);

            // This creates the exclusive consumer first which avoids AMQ-1024 bug.
            ActiveMQQueue exclusiveQueue = new ActiveMQQueue("TEST.QUEUE4?consumer.exclusive=true");
            MessageConsumer exclusiveConsumer = exclusiveSession.createConsumer(exclusiveQueue);

            ActiveMQQueue fallbackQueue = new ActiveMQQueue("TEST.QUEUE4");
            MessageConsumer fallbackConsumer = fallbackSession.createConsumer(fallbackQueue);

            ActiveMQQueue senderQueue = new ActiveMQQueue("TEST.QUEUE4");

            MessageProducer producer = senderSession.createProducer(senderQueue);

            Message msg = senderSession.createTextMessage("test");
            producer.send(msg);
            Thread.sleep(100);

            // Verify exclusive consumer receives the message.
            assertNotNull(exclusiveConsumer.receive(100));
            assertNull(fallbackConsumer.receive(100));

            // Close the exclusive consumer to verify the non-exclusive consumer takes over
            exclusiveConsumer.close();

            producer.send(msg);

            // Verify other non-exclusive consumer receices the message.
            assertNotNull(fallbackConsumer.receive(100));

            // Create exclusive consumer to determine if it will start receiving the messages.
            exclusiveConsumer = exclusiveSession.createConsumer(exclusiveQueue);

            producer.send(msg);
            assertNotNull(exclusiveConsumer.receive(100));
            assertNull(fallbackConsumer.receive(100));
        } finally {
            fallbackSession.close();
            senderSession.close();
            conn.close();
        }
    }
}