/**
 * 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.usecases;

import java.net.URI;
import java.util.List;
import java.util.concurrent.TimeUnit;

import javax.jms.Destination;
import javax.jms.MessageConsumer;
import javax.jms.TextMessage;

import junit.framework.Test;

import org.apache.activemq.JmsMultipleBrokersTestSupport;
import org.apache.activemq.broker.BrokerPlugin;
import org.apache.activemq.broker.BrokerPluginSupport;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.broker.TransportConnector;
import org.apache.activemq.command.ConnectionInfo;
import org.apache.activemq.network.DiscoveryNetworkConnector;
import org.apache.activemq.network.NetworkConnector;
import org.apache.activemq.transport.vm.VMTransportFactory;
import org.apache.activemq.util.MessageIdList;
import org.apache.activemq.util.SocketProxy;
import org.apache.activemq.util.Wait;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class BrokerQueueNetworkWithDisconnectTest extends JmsMultipleBrokersTestSupport {

   private static final Log LOG = LogFactory.getLog(BrokerQueueNetworkWithDisconnectTest.class);
   private static final int NETWORK_DOWN_TIME = 5000;
   protected static final int MESSAGE_COUNT = 200;
   private static final String HUB = "HubBroker";
   private static final String SPOKE = "SpokeBroker";
   private SocketProxy socketProxy;
   private long networkDownTimeStart;
   public boolean useDuplexNetworkBridge = true;
   public boolean simulateStalledNetwork;
   private long inactiveDuration = 1000;
   private boolean useSocketProxy = true;

   public void initCombosForTestSendOnAReceiveOnBWithTransportDisconnect() {
      addCombinationValues("useDuplexNetworkBridge", new Object[]{Boolean.TRUE, Boolean.FALSE});
      addCombinationValues("simulateStalledNetwork", new Object[]{Boolean.TRUE});
   }

   public void testSendOnAReceiveOnBWithTransportDisconnect() throws Exception {
      bridgeBrokers(SPOKE, HUB);

      startAllBrokers();

      // Setup destination
      Destination dest = createDestination("TEST.FOO", false);

      // Setup consumers
      MessageConsumer client = createConsumer(HUB, dest);

      // allow subscription information to flow back to Spoke
      sleep(600);

      // Send messages
      sendMessages(SPOKE, dest, MESSAGE_COUNT);

      MessageIdList msgs = getConsumerMessages(HUB, client);
      msgs.waitForMessagesToArrive(MESSAGE_COUNT);

      assertTrue("At least message " + MESSAGE_COUNT +
                    " must be received, duplicates are expected, count=" + msgs.getMessageCount(), MESSAGE_COUNT <= msgs.getMessageCount());
   }

   @SuppressWarnings("unchecked")
   public void testNoStuckConnectionsWithTransportDisconnect() throws Exception {
      inactiveDuration = 60000L;
      useDuplexNetworkBridge = true;

      bridgeBrokers(SPOKE, HUB);

      final BrokerItem hub = brokers.get(HUB);
      hub.broker.setPlugins(new BrokerPlugin[]{new BrokerPluginSupport() {
         int sleepCount = 2;

         @Override
         public void removeConnection(ConnectionContext context,
                                      ConnectionInfo info,
                                      Throwable error) throws Exception {
            try {
               while (--sleepCount >= 0) {
                  LOG.info("sleeping for a bit in close impl to simulate load where reconnect fails due to a pending close");
                  TimeUnit.SECONDS.sleep(2);
               }
            }
            catch (Exception ignored) {
            }
            super.removeConnection(context, info, error);
         }
      }});
      startAllBrokers();
      waitForBridgeFormation();

      // kill the initiator side, leaving remote end intact
      // simulate async network breakage
      // remote side will need to spot duplicate network and stop/kill the original
      for (int i = 0; i < 3; i++) {
         socketProxy.halfClose();
         sleep(10000);
      }
      // wait for full reformation of bridge
      // verify no extra connections
      boolean allGood = Wait.waitFor(new Wait.Condition() {
         @Override
         public boolean isSatisified() throws Exception {
            long numConnections = hub.broker.getTransportConnectors().get(0).getConnections().size();
            LOG.info("Num connetions:" + numConnections);
            return numConnections == 1;
         }
      });
      if (!allGood) {
         dumpAllThreads("ExtraHubConnection");
      }
      assertTrue("should be only one transport connection for the single duplex network connector", allGood);

      allGood = Wait.waitFor(new Wait.Condition() {
         @Override
         public boolean isSatisified() throws Exception {
            long numVmConnections = VMTransportFactory.SERVERS.get(HUB).getConnectionCount();
            LOG.info("Num VM connetions:" + numVmConnections);
            return numVmConnections == 2;
         }
      });
      if (!allGood) {
         dumpAllThreads("ExtraHubVMConnection");
      }
      assertTrue("should be only 2 vm connections for the single network duplex network connector", allGood);
   }

   public void testTwoDuplexNCsAreAllowed() throws Exception {
      useDuplexNetworkBridge = true;
      useSocketProxy = false;

      NetworkConnector connector = bridgeBrokers(SPOKE, HUB);
      connector.setName("FirstDuplex");
      connector = bridgeBrokers(SPOKE, HUB);
      connector.setName("SecondDuplex");

      startAllBrokers();
      waitForBridgeFormation();

      BrokerItem hub = brokers.get(HUB);
      assertEquals("Has two transport Connectors", 2, hub.broker.getTransportConnectors().get(0).getConnections().size());
   }

   @Override
   protected void startAllBrokers() throws Exception {
      // Ensure HUB is started first so bridge will be active from the get go
      BrokerItem brokerItem = brokers.get(HUB);
      brokerItem.broker.start();
      brokerItem = brokers.get(SPOKE);
      brokerItem.broker.start();
      sleep(600);
   }

   @Override
   public void setUp() throws Exception {
      networkDownTimeStart = 0;
      inactiveDuration = 1000;
      useSocketProxy = true;
      super.setAutoFail(true);
      super.setUp();
      final String options = "?persistent=true&useJmx=false&deleteAllMessagesOnStartup=true";
      createBroker(new URI("broker:(tcp://localhost:61617)/" + HUB + options));
      createBroker(new URI("broker:(tcp://localhost:61616)/" + SPOKE + options));
   }

   @Override
   public void tearDown() throws Exception {
      super.tearDown();
      if (socketProxy != null) {
         socketProxy.close();
      }
   }

   public static Test suite() {
      return suite(BrokerQueueNetworkWithDisconnectTest.class);
   }

   @Override
   protected void onSend(int i, TextMessage msg) {
      sleep(50);
      if (i == 50 || i == 150) {
         if (simulateStalledNetwork) {
            socketProxy.pause();
         }
         else {
            socketProxy.close();
         }
         networkDownTimeStart = System.currentTimeMillis();
      }
      else if (networkDownTimeStart > 0) {
         // restart after NETWORK_DOWN_TIME seconds
         if (networkDownTimeStart + NETWORK_DOWN_TIME < System.currentTimeMillis()) {
            if (simulateStalledNetwork) {
               socketProxy.goOn();
            }
            else {
               socketProxy.reopen();
            }
            networkDownTimeStart = 0;
         }
         else {
            // slow message production to allow bridge to recover and limit message duplication
            sleep(500);
         }
      }
      super.onSend(i, msg);
   }

   private void sleep(int milliSecondTime) {
      try {
         Thread.sleep(milliSecondTime);
      }
      catch (InterruptedException igonred) {
      }
   }

   @Override
   protected NetworkConnector bridgeBrokers(BrokerService localBroker,
                                            BrokerService remoteBroker,
                                            boolean dynamicOnly,
                                            int networkTTL,
                                            boolean conduit,
                                            boolean failover) throws Exception {
      List<TransportConnector> transportConnectors = remoteBroker.getTransportConnectors();
      URI remoteURI;
      if (!transportConnectors.isEmpty()) {
         remoteURI = transportConnectors.get(0).getConnectUri();
         if (useSocketProxy) {
            socketProxy = new SocketProxy(remoteURI);
            remoteURI = socketProxy.getUrl();
         }
         DiscoveryNetworkConnector connector = new DiscoveryNetworkConnector(new URI("static:(" + remoteURI + "?wireFormat.maxInactivityDuration=" + inactiveDuration + "&wireFormat.maxInactivityDurationInitalDelay=" + inactiveDuration + ")?useExponentialBackOff=false"));
         connector.setDynamicOnly(dynamicOnly);
         connector.setNetworkTTL(networkTTL);
         localBroker.addNetworkConnector(connector);
         maxSetupTime = 2000;
         if (useDuplexNetworkBridge) {
            connector.setDuplex(true);
         }
         return connector;
      }
      else {
         throw new Exception("Remote broker has no registered connectors.");
      }
   }
}
