/**
 * 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;

/**
 * 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.
 */

import java.io.InputStream;
import java.io.OutputStream;
import java.util.Random;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;

import javax.jms.Destination;
import javax.jms.Session;

import junit.framework.Assert;
import junit.framework.TestCase;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @author rnewson
 */
public final class LargeStreamletTest extends TestCase {

    private static final Log LOG = LogFactory.getLog(LargeStreamletTest.class);
    private static final String BROKER_URL = "vm://localhost?broker.persistent=false";
    private static final int BUFFER_SIZE = 1 * 1024;
    private static final int MESSAGE_COUNT = 10 * 1024;

    protected Exception writerException;
    protected Exception readerException;

    private AtomicInteger totalRead = new AtomicInteger();
    private AtomicInteger totalWritten = new AtomicInteger();
    private AtomicBoolean stopThreads = new AtomicBoolean(false);

    public void testStreamlets() throws Exception {
        final ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(BROKER_URL);

        final ActiveMQConnection connection = (ActiveMQConnection)factory.createConnection();
        connection.start();
        try {
            final Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
            try {
                final Destination destination = session.createQueue("wibble");
                final Thread readerThread = new Thread(new Runnable() {

                    public void run() {
                        totalRead.set(0);
                        try {
                            final InputStream inputStream = connection.createInputStream(destination);
                            try {
                                int read;
                                final byte[] buf = new byte[BUFFER_SIZE];
                                while (!stopThreads.get() && (read = inputStream.read(buf)) != -1) {
                                    totalRead.addAndGet(read);
                                }
                            } finally {
                                inputStream.close();
                            }
                        } catch (Exception e) {
                            readerException = e;
                            e.printStackTrace();
                        } finally {
                            LOG.info(totalRead + " total bytes read.");
                        }
                    }
                });

                final Thread writerThread = new Thread(new Runnable() {
                    private final Random random = new Random();

                    public void run() {
                        totalWritten.set(0);
                        int count = MESSAGE_COUNT;
                        try {
                            final OutputStream outputStream = connection.createOutputStream(destination);
                            try {
                                final byte[] buf = new byte[BUFFER_SIZE];
                                random.nextBytes(buf);
                                while (count > 0 && !stopThreads.get()) {
                                    outputStream.write(buf);
                                    totalWritten.addAndGet(buf.length);
                                    count--;
                                }
                            } finally {
                                outputStream.close();
                            }
                        } catch (Exception e) {
                            writerException = e;
                            e.printStackTrace();
                        } finally {
                            LOG.info(totalWritten + " total bytes written.");
                        }
                    }
                });

                readerThread.start();
                writerThread.start();

                // Wait till reader is has finished receiving all the messages
                // or he has stopped
                // receiving messages.
                Thread.sleep(1000);
                int lastRead = totalRead.get();
                while (readerThread.isAlive()) {
                    readerThread.join(1000);
                    // No progress?? then stop waiting..
                    if (lastRead == totalRead.get()) {
                        break;
                    }
                    lastRead = totalRead.get();
                }

                stopThreads.set(true);

                assertTrue("Should not have received a reader exception", readerException == null);
                assertTrue("Should not have received a writer exception", writerException == null);

                Assert.assertEquals("Not all messages accounted for", totalWritten.get(), totalRead.get());

            } finally {
                session.close();
            }
        } finally {
            connection.close();
        }
    }

}
