/**
 * 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.network;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.Session;
import javax.jms.TopicSubscriber;
import javax.management.ObjectName;
import java.io.File;
import java.util.Arrays;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.ActiveMQPrefetchPolicy;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.jmx.BrokerView;
import org.apache.activemq.broker.jmx.DestinationViewMBean;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.ActiveMQTopic;
import org.apache.activemq.store.kahadb.KahaDBPersistenceAdapter;
import org.apache.activemq.util.Wait;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static org.junit.Assert.assertTrue;

public class NetworkBrokerDetachTest {

   private final static String BROKER_NAME = "broker";
   private final static String REM_BROKER_NAME = "networkedBroker";
   private final static String DESTINATION_NAME = "testQ";
   private final static int NUM_CONSUMERS = 1;

   protected static final Logger LOG = LoggerFactory.getLogger(NetworkBrokerDetachTest.class);
   protected final int numRestarts = 3;
   protected final int networkTTL = 2;
   protected final boolean dynamicOnly = false;

   protected BrokerService broker;
   protected BrokerService networkedBroker;

   protected BrokerService createBroker() throws Exception {
      BrokerService broker = new BrokerService();
      broker.setBrokerName(BROKER_NAME);
      configureBroker(broker);
      broker.addConnector("tcp://localhost:61617");
      NetworkConnector networkConnector = broker.addNetworkConnector("static:(tcp://localhost:62617?wireFormat.maxInactivityDuration=500)?useExponentialBackOff=false");
      configureNetworkConnector(networkConnector);
      return broker;
   }

   protected BrokerService createNetworkedBroker() throws Exception {
      BrokerService broker = new BrokerService();
      broker.setBrokerName(REM_BROKER_NAME);
      configureBroker(broker);
      broker.getManagementContext().setCreateConnector(false);
      broker.addConnector("tcp://localhost:62617");
      NetworkConnector networkConnector = broker.addNetworkConnector("static:(tcp://localhost:61617?wireFormat.maxInactivityDuration=500)?useExponentialBackOff=false");
      configureNetworkConnector(networkConnector);
      return broker;
   }

   private void configureNetworkConnector(NetworkConnector networkConnector) {
      networkConnector.setDuplex(false);
      networkConnector.setNetworkTTL(networkTTL);
      networkConnector.setDynamicOnly(dynamicOnly);
   }

   // variants for each store....
   protected void configureBroker(BrokerService broker) throws Exception {
      KahaDBPersistenceAdapter persistenceAdapter = new KahaDBPersistenceAdapter();
      persistenceAdapter.setDirectory(new File("target/activemq-data/kahadb/" + broker.getBrokerName() + "NetworBrokerDetatchTest"));
      broker.setPersistenceAdapter(persistenceAdapter);
   }

   @Before
   public void init() throws Exception {
      broker = createBroker();
      broker.setDeleteAllMessagesOnStartup(true);
      broker.start();

      networkedBroker = createNetworkedBroker();
      networkedBroker.setDeleteAllMessagesOnStartup(true);
      networkedBroker.start();
   }

   @After
   public void cleanup() throws Exception {
      networkedBroker.stop();
      networkedBroker.waitUntilStopped();

      broker.stop();
      broker.waitUntilStopped();
   }

   @Test
   public void testNetworkedBrokerDetach() throws Exception {
      LOG.info("Creating Consumer on the networked broker ...");
      // Create a consumer on the networked broker
      ConnectionFactory consFactory = createConnectionFactory(networkedBroker);
      Connection consConn = consFactory.createConnection();
      Session consSession = consConn.createSession(false, Session.AUTO_ACKNOWLEDGE);
      ActiveMQDestination destination = (ActiveMQDestination) consSession.createQueue(DESTINATION_NAME);
      for (int i = 0; i < NUM_CONSUMERS; i++) {
         consSession.createConsumer(destination);
      }

      assertTrue("got expected consumer count from mbean within time limit", verifyConsumerCount(1, destination, broker));

      LOG.info("Stopping Consumer on the networked broker ...");
      // Closing the connection will also close the consumer
      consConn.close();

      // We should have 0 consumer for the queue on the local broker
      assertTrue("got expected 0 count from mbean within time limit", verifyConsumerCount(0, destination, broker));
   }

   @Test
   public void testNetworkedBrokerDurableSubAfterRestart() throws Exception {

      final AtomicInteger count = new AtomicInteger(0);
      MessageListener counter = new MessageListener() {
         @Override
         public void onMessage(Message message) {
            count.incrementAndGet();
         }
      };

      LOG.info("Creating durable consumer on each broker ...");
      ActiveMQTopic destination = registerDurableConsumer(networkedBroker, counter);
      registerDurableConsumer(broker, counter);

      assertTrue("got expected consumer count from local broker mbean within time limit", verifyConsumerCount(2, destination, broker));

      assertTrue("got expected consumer count from network broker mbean within time limit", verifyConsumerCount(2, destination, networkedBroker));

      sendMessageTo(destination, broker);

      assertTrue("Got one message on each", verifyMessageCount(2, count));

      LOG.info("Stopping brokerTwo...");
      networkedBroker.stop();
      networkedBroker.waitUntilStopped();

      LOG.info("restarting  broker Two...");
      networkedBroker = createNetworkedBroker();
      networkedBroker.start();

      LOG.info("Recreating durable Consumer on the broker after restart...");
      registerDurableConsumer(networkedBroker, counter);

      // give advisories a chance to percolate
      TimeUnit.SECONDS.sleep(5);

      sendMessageTo(destination, broker);

      // expect similar after restart
      assertTrue("got expected consumer count from local broker mbean within time limit", verifyConsumerCount(2, destination, broker));

      // a durable sub is auto bridged on restart unless dynamicOnly=true
      assertTrue("got expected consumer count from network broker mbean within time limit", verifyConsumerCount(2, destination, networkedBroker));

      assertTrue("got no inactive subs on broker", verifyDurableConsumerCount(0, broker));
      assertTrue("got no inactive subs on other broker", verifyDurableConsumerCount(0, networkedBroker));

      assertTrue("Got two more messages after restart", verifyMessageCount(4, count));
      TimeUnit.SECONDS.sleep(1);
      assertTrue("still Got just two more messages", verifyMessageCount(4, count));
   }

   private boolean verifyMessageCount(final int i, final AtomicInteger count) throws Exception {
      return Wait.waitFor(new Wait.Condition() {
         @Override
         public boolean isSatisified() throws Exception {
            return i == count.get();
         }
      });
   }

   private ActiveMQTopic registerDurableConsumer(BrokerService brokerService,
                                                 MessageListener listener) throws Exception {
      ConnectionFactory factory = createConnectionFactory(brokerService);
      Connection connection = factory.createConnection();
      connection.setClientID("DurableOne");
      connection.start();
      Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      ActiveMQTopic destination = (ActiveMQTopic) session.createTopic(DESTINATION_NAME);
      // unique to a broker
      TopicSubscriber sub = session.createDurableSubscriber(destination, "SubOne" + brokerService.getBrokerName());
      sub.setMessageListener(listener);
      return destination;
   }

   private void sendMessageTo(ActiveMQTopic destination, BrokerService brokerService) throws Exception {
      ConnectionFactory factory = createConnectionFactory(brokerService);
      Connection conn = factory.createConnection();
      conn.start();
      Session session = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
      session.createProducer(destination).send(session.createTextMessage("Hi"));
      conn.close();
   }

   protected ConnectionFactory createConnectionFactory(final BrokerService broker) throws Exception {
      String url = broker.getTransportConnectors().get(0).getServer().getConnectURI().toString();
      ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url);
      connectionFactory.setOptimizedMessageDispatch(true);
      connectionFactory.setCopyMessageOnSend(false);
      connectionFactory.setUseCompression(false);
      connectionFactory.setDispatchAsync(false);
      connectionFactory.setUseAsyncSend(false);
      connectionFactory.setOptimizeAcknowledge(false);
      connectionFactory.setWatchTopicAdvisories(true);
      ActiveMQPrefetchPolicy qPrefetchPolicy = new ActiveMQPrefetchPolicy();
      qPrefetchPolicy.setQueuePrefetch(100);
      qPrefetchPolicy.setTopicPrefetch(1000);
      connectionFactory.setPrefetchPolicy(qPrefetchPolicy);
      connectionFactory.setAlwaysSyncSend(true);
      return connectionFactory;
   }

   // JMX Helper Methods
   private boolean verifyConsumerCount(final long expectedCount,
                                       final ActiveMQDestination destination,
                                       final BrokerService broker) throws Exception {
      return Wait.waitFor(new Wait.Condition() {
         @Override
         public boolean isSatisified() throws Exception {
            boolean result = false;
            try {

               ObjectName[] destinations;

               if (destination.isQueue()) {
                  destinations = broker.getAdminView().getQueues();
               } else {
                  destinations = broker.getAdminView().getTopics();
               }

               // We should have 1 consumer for the queue on the local broker
               for (ObjectName name : destinations) {
                  DestinationViewMBean view = (DestinationViewMBean) broker.getManagementContext().newProxyInstance(name, DestinationViewMBean.class, true);

                  if (view.getName().equals(destination.getPhysicalName())) {
                     LOG.info("Consumers for " + destination.getPhysicalName() + " on " + broker + " : " + view.getConsumerCount());
                     LOG.info("Subs: " + Arrays.asList(view.getSubscriptions()));
                     if (expectedCount == view.getConsumerCount()) {
                        result = true;
                     }
                  }
               }

            } catch (Exception ignoreAndRetry) {
            }
            return result;
         }
      });
   }

   private boolean verifyDurableConsumerCount(final long expectedCount, final BrokerService broker) throws Exception {
      return Wait.waitFor(new Wait.Condition() {
         @Override
         public boolean isSatisified() throws Exception {
            boolean result = false;
            BrokerView view = broker.getAdminView();

            if (view != null) {
               ObjectName[] subs = broker.getAdminView().getInactiveDurableTopicSubscribers();
               if (subs != null) {
                  LOG.info("inactive durable subs on " + broker + " : " + Arrays.asList(subs));
                  if (expectedCount == subs.length) {
                     result = true;
                  }
               }
            }
            return result;
         }
      });
   }
}
