/**
 * 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.broker.policy;

import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.Session;
import java.util.concurrent.atomic.AtomicInteger;

import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.RedeliveryPolicy;
import org.apache.activemq.command.ActiveMQQueue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MessageListenerDeadLetterTest extends DeadLetterTestSupport {

   private static final Logger LOG = LoggerFactory.getLogger(MessageListenerDeadLetterTest.class);

   private int rollbackCount;

   private Session dlqSession;

   private final Error[] error = new Error[1];

   @Override
   protected void doTest() throws Exception {
      messageCount = 200;
      connection.start();

      ActiveMQConnection amqConnection = (ActiveMQConnection) connection;
      rollbackCount = amqConnection.getRedeliveryPolicy().getMaximumRedeliveries() + 1;
      LOG.info("Will redeliver messages: " + rollbackCount + " times");

      makeConsumer();
      makeDlqConsumer();

      sendMessages();

      // now lets receive and rollback N times
      int maxRollbacks = messageCount * rollbackCount;
      consumer.setMessageListener(new RollbackMessageListener(maxRollbacks, rollbackCount));

      for (int i = 0; i < messageCount; i++) {
         Message msg = dlqConsumer.receive(4000);
         if (error[0] != null) {
            // error from message listener
            throw error[0];
         }
         assertMessage(msg, i);
         assertNotNull("Should be a DLQ message for loop: " + i, msg);
      }
      if (error[0] != null) {
         throw error[0];
      }
   }

   @Override
   protected void makeDlqConsumer() throws JMSException {
      dlqDestination = createDlqDestination();

      LOG.info("Consuming from dead letter on: " + dlqDestination);
      dlqConsumer = dlqSession.createConsumer(dlqDestination);
   }

   @Override
   protected void setUp() throws Exception {
      transactedMode = true;
      super.setUp();
      dlqSession = connection.createSession(transactedMode, acknowledgeMode);
   }

   @Override
   protected void tearDown() throws Exception {
      dlqConsumer.close();
      dlqSession.close();
      session.close();
      super.tearDown();
   }

   @Override
   protected ActiveMQConnectionFactory createConnectionFactory() throws Exception {
      ActiveMQConnectionFactory answer = super.createConnectionFactory();
      RedeliveryPolicy policy = new RedeliveryPolicy();
      policy.setMaximumRedeliveries(3);
      policy.setBackOffMultiplier((short) 1);
      policy.setRedeliveryDelay(0);
      policy.setInitialRedeliveryDelay(0);
      policy.setUseExponentialBackOff(false);
      answer.setRedeliveryPolicy(policy);
      return answer;
   }

   @Override
   protected Destination createDlqDestination() {
      return new ActiveMQQueue("ActiveMQ.DLQ");
   }

   class RollbackMessageListener implements MessageListener {

      final int maxRollbacks;

      final int deliveryCount;

      AtomicInteger rollbacks = new AtomicInteger();

      RollbackMessageListener(int c, int delvery) {
         maxRollbacks = c;
         deliveryCount = delvery;
      }

      @Override
      public void onMessage(Message message) {
         try {
            int expectedMessageId = rollbacks.get() / deliveryCount;
            LOG.info("expecting messageId: " + expectedMessageId);
            assertMessage(message, expectedMessageId);
            if (rollbacks.incrementAndGet() > maxRollbacks) {
               fail("received too many messages, already done too many rollbacks: " + rollbacks);
            }
            session.rollback();

         } catch (Throwable e) {
            LOG.error("unexpected exception:" + e, e);
            // propagating assertError to execution task will cause a hang
            // at shutdown
            if (e instanceof Error) {
               error[0] = (Error) e;
            } else {
               fail("unexpected exception: " + e);
            }

         }
      }
   }
}
