/**
 * 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 javax.jms.Destination;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

import org.apache.activemq.JmsMultipleBrokersTestSupport;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.region.Queue;
import org.apache.activemq.broker.region.RegionBroker;
import org.apache.activemq.broker.region.policy.PolicyEntry;
import org.apache.activemq.broker.region.policy.PolicyMap;
import org.apache.activemq.broker.region.policy.VMPendingQueueMessageStoragePolicy;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.usage.SystemUsage;

public class QueueMemoryFullMultiBrokersTest extends JmsMultipleBrokersTestSupport {

   public static final int BROKER_COUNT = 2;
   public static final int MESSAGE_COUNT = 2000;

   public void testQueueNetworkWithConsumerFull() throws Exception {

      bridgeAllBrokers();
      startAllBrokers();

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

      sendMessages("Broker1", dest, 50);

      CountDownLatch latch = new CountDownLatch(MESSAGE_COUNT);
      createConsumer("Broker2", dest, latch);
      assertConsumersConnect("Broker1", dest, 1, 30000);
      sendMessages("Broker1", dest, MESSAGE_COUNT - 50);

      // Wait for messages to be delivered
      assertTrue("Missing " + latch.getCount() + " messages", latch.await(45, TimeUnit.SECONDS));

      // verify stats, all messages acked
      BrokerService broker1 = brokers.get("Broker1").broker;
      RegionBroker regionBroker = (RegionBroker) broker1.getRegionBroker();
      // give the acks a chance to flow
      Thread.sleep(2000);
      Queue internalQueue = (Queue) regionBroker.getDestinations(ActiveMQDestination.transform(dest)).iterator().next();

      assertTrue("All messages are consumed and acked from source:" + internalQueue, internalQueue.getMessages().isEmpty());
      assertEquals("messages source:" + internalQueue, 0, internalQueue.getDestinationStatistics().getMessages().getCount());
      assertEquals("inflight source:" + internalQueue, 0, internalQueue.getDestinationStatistics().getInflight().getCount());
   }

   @Override
   public void setUp() throws Exception {
      super.setAutoFail(true);
      super.setUp();
      messageSize = 1024;

      // Setup n brokers
      for (int i = 1; i <= BROKER_COUNT; i++) {
         createBroker(new URI("broker:()/Broker" + i + "?persistent=false&useJmx=false"));
      }
      BrokerService broker2 = brokers.get("Broker2").broker;
      applyMemoryLimitPolicy(broker2);
   }

   private void applyMemoryLimitPolicy(BrokerService broker) {
      final SystemUsage memoryManager = new SystemUsage();
      memoryManager.getMemoryUsage().setLimit(1024 * 50); // 50 MB
      broker.setSystemUsage(memoryManager);

      final List<PolicyEntry> policyEntries = new ArrayList<>();
      final PolicyEntry entry = new PolicyEntry();
      entry.setQueue(">");
      entry.setMemoryLimit(1024 * 4); // Set to 2 kb
      entry.setPendingQueuePolicy(new VMPendingQueueMessageStoragePolicy());
      policyEntries.add(entry);

      final PolicyMap policyMap = new PolicyMap();
      policyMap.setPolicyEntries(policyEntries);
      broker.setDestinationPolicy(policyMap);

   }
}
