/**
 * 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.transport.reliable;

import java.util.Queue;

import junit.framework.TestCase;
import org.apache.activemq.command.ConsumerInfo;
import org.apache.activemq.transport.StubTransport;
import org.apache.activemq.transport.StubTransportListener;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @version $Revision$
 */
public class ReliableTransportTest extends TestCase {

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

    protected ReliableTransport transport;
    protected StubTransportListener listener = new StubTransportListener();
    protected ReplayStrategy replayStrategy;

    public void testValidSequenceOfPackets() throws Exception {
        int[] sequenceNumbers = {1, 2, 3, 4, 5, 6, 7};

        sendStreamOfCommands(sequenceNumbers, true);
    }

    public void testValidWrapAroundPackets() throws Exception {
        int[] sequenceNumbers = new int[10];

        int value = Integer.MAX_VALUE - 3;
        transport.setExpectedCounter(value);

        for (int i = 0; i < 10; i++) {
            LOG.info("command: " + i + " = " + value);
            sequenceNumbers[i] = value++;
        }

        sendStreamOfCommands(sequenceNumbers, true);
    }

    public void testDuplicatePacketsDropped() throws Exception {
        int[] sequenceNumbers = {1, 2, 2, 3, 4, 5, 6, 7};

        sendStreamOfCommands(sequenceNumbers, true, 7);
    }

    public void testOldDuplicatePacketsDropped() throws Exception {
        int[] sequenceNumbers = {1, 2, 3, 4, 5, 2, 6, 7};

        sendStreamOfCommands(sequenceNumbers, true, 7);
    }

    public void testOldDuplicatePacketsDroppedUsingNegativeCounters() throws Exception {
        int[] sequenceNumbers = {-3, -1, -3, -2, -1, 0, 1, -1, 3, 2, 0, 2, 4};

        transport.setExpectedCounter(-3);

        sendStreamOfCommands(sequenceNumbers, true, 8);
    }

    public void testWrongOrderOfPackets() throws Exception {
        int[] sequenceNumbers = {4, 3, 1, 5, 2, 7, 6, 8, 10, 9};

        sendStreamOfCommands(sequenceNumbers, true);
    }

    public void testMissingPacketsFails() throws Exception {
        int[] sequenceNumbers = {1, 2, /* 3, */4, 5, 6, 7, 8, 9, 10};

        sendStreamOfCommands(sequenceNumbers, false);
    }

    protected void sendStreamOfCommands(int[] sequenceNumbers, boolean expected) {
        sendStreamOfCommands(sequenceNumbers, expected, sequenceNumbers.length);
    }

    protected void sendStreamOfCommands(int[] sequenceNumbers, boolean expected, int expectedCount) {
        for (int i = 0; i < sequenceNumbers.length; i++) {
            int commandId = sequenceNumbers[i];

            ConsumerInfo info = new ConsumerInfo();
            info.setSelector("Cheese: " + commandId);
            info.setCommandId(commandId);

            transport.onCommand(info);
        }

        Queue exceptions = listener.getExceptions();
        Queue commands = listener.getCommands();
        if (expected) {
            if (!exceptions.isEmpty()) {
                Exception e = (Exception)exceptions.remove();
                e.printStackTrace();
                fail("Caught exception: " + e);
            }
            assertEquals("number of messages received", expectedCount, commands.size());

            assertEquals("Should have no buffered commands", 0, transport.getBufferedCommandCount());
        } else {
            assertTrue("Should have received an exception!", exceptions.size() > 0);
            Exception e = (Exception)exceptions.remove();
            LOG.info("Caught expected response: " + e);
        }
    }

    protected void setUp() throws Exception {
        if (replayStrategy == null) {
            replayStrategy = new ExceptionIfDroppedReplayStrategy();
        }
        transport = new ReliableTransport(new StubTransport(), replayStrategy);
        transport.setTransportListener(listener);
        transport.start();
    }

}
