/**
 * 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.region.cursors;

import java.io.IOException;
import java.util.concurrent.Executors;
import java.util.concurrent.FutureTask;
import java.util.concurrent.atomic.AtomicLong;

import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.broker.region.DestinationStatistics;
import org.apache.activemq.broker.region.MessageReference;
import org.apache.activemq.broker.region.Queue;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.command.ActiveMQTextMessage;
import org.apache.activemq.command.ConsumerInfo;
import org.apache.activemq.command.Message;
import org.apache.activemq.command.MessageAck;
import org.apache.activemq.command.MessageId;
import org.apache.activemq.store.AbstractMessageStore;
import org.apache.activemq.store.MessageRecoveryListener;
import org.apache.activemq.usage.SystemUsage;
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.assertEquals;
import static org.junit.Assert.assertTrue;

public class StoreQueueCursorOrderTest {

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

   ActiveMQQueue destination = new ActiveMQQueue("queue-" + StoreQueueCursorOrderTest.class.getSimpleName());
   BrokerService brokerService;

   final static String mesageIdRoot = "11111:22222:0:";
   final int messageBytesSize = 1024;
   final String text = new String(new byte[messageBytesSize]);

   @Before
   public void setUp() throws Exception {
      brokerService = createBroker();
      brokerService.setUseJmx(false);
      brokerService.deleteAllMessages();
      brokerService.start();
   }

   protected BrokerService createBroker() throws Exception {
      return new BrokerService();
   }

   @After
   public void tearDown() throws Exception {
      brokerService.stop();
   }

   @Test
   public void tesBlockedFuture() throws Exception {
      final int count = 2;
      final Message[] messages = new Message[count];
      final TestMessageStore queueMessageStore = new TestMessageStore(messages, destination);
      final ConsumerInfo consumerInfo = new ConsumerInfo();
      final DestinationStatistics destinationStatistics = new DestinationStatistics();
      consumerInfo.setExclusive(true);

      final Queue queue = new Queue(brokerService, destination, queueMessageStore, destinationStatistics, null);

      queueMessageStore.start();
      queueMessageStore.registerIndexListener(null);

      QueueStorePrefetch underTest = new QueueStorePrefetch(queue, brokerService.getBroker());
      SystemUsage systemUsage = new SystemUsage();
      // ensure memory limit is reached
      systemUsage.getMemoryUsage().setLimit(messageBytesSize * 1);
      underTest.setSystemUsage(systemUsage);
      underTest.setEnableAudit(false);
      underTest.start();
      assertTrue("cache enabled", underTest.isUseCache() && underTest.isCacheEnabled());

      ActiveMQTextMessage msg = getMessage(0);
      messages[1] = msg;
      msg.setMemoryUsage(systemUsage.getMemoryUsage());
      msg.setRecievedByDFBridge(true);
      FutureTask<Long> future = new FutureTask<Long>(new Runnable() {
         @Override
         public void run() {
         }
      }, 2L) {
      };
      msg.getMessageId().setFutureOrSequenceLong(future);
      underTest.addMessageLast(msg);

      assertTrue("cache enabled", underTest.isUseCache() && underTest.isCacheEnabled());

      // second message will flip the cache but will be stored before the future task
      msg = getMessage(1);
      messages[0] = msg;
      msg.setMemoryUsage(systemUsage.getMemoryUsage());
      msg.getMessageId().setFutureOrSequenceLong(1L);
      underTest.addMessageLast(msg);

      assertTrue("cache is disabled as limit reached", !underTest.isCacheEnabled());
      assertEquals("setBatch unset", 0L, queueMessageStore.batch.get());

      int dequeueCount = 0;

      underTest.setMaxBatchSize(2);
      underTest.reset();
      while (underTest.hasNext() && dequeueCount < count) {
         MessageReference ref = underTest.next();
         ref.decrementReferenceCount();
         underTest.remove();
         LOG.info("Received message: {} with body: {}", ref.getMessageId(), ((ActiveMQTextMessage) ref.getMessage()).getText());
         assertEquals(dequeueCount++, ref.getMessageId().getProducerSequenceId());
      }
      underTest.release();
      assertEquals(count, dequeueCount);
   }

   @Test
   public void testNoSetBatchWithUnOrderedFutureCurrentSync() throws Exception {
      final int count = 2;
      final Message[] messages = new Message[count];
      final TestMessageStore queueMessageStore = new TestMessageStore(messages, destination);
      final ConsumerInfo consumerInfo = new ConsumerInfo();
      final DestinationStatistics destinationStatistics = new DestinationStatistics();
      consumerInfo.setExclusive(true);

      final Queue queue = new Queue(brokerService, destination, queueMessageStore, destinationStatistics, null);

      queueMessageStore.start();
      queueMessageStore.registerIndexListener(null);

      QueueStorePrefetch underTest = new QueueStorePrefetch(queue, brokerService.getBroker());
      SystemUsage systemUsage = new SystemUsage();
      // ensure memory limit is reached
      systemUsage.getMemoryUsage().setLimit(messageBytesSize * 1);
      underTest.setSystemUsage(systemUsage);
      underTest.setEnableAudit(false);
      underTest.start();
      assertTrue("cache enabled", underTest.isUseCache() && underTest.isCacheEnabled());

      ActiveMQTextMessage msg = getMessage(0);
      messages[1] = msg;
      msg.setMemoryUsage(systemUsage.getMemoryUsage());
      msg.setRecievedByDFBridge(true);
      final ActiveMQTextMessage msgRef = msg;
      FutureTask<Long> future = new FutureTask<Long>(new Runnable() {
         @Override
         public void run() {
            msgRef.getMessageId().setFutureOrSequenceLong(1L);
         }
      }, 1L) {
      };
      msg.getMessageId().setFutureOrSequenceLong(future);
      Executors.newSingleThreadExecutor().submit(future);
      underTest.addMessageLast(msg);

      assertTrue("cache enabled", underTest.isUseCache() && underTest.isCacheEnabled());

      // second message will flip the cache but will be stored before the future task
      msg = getMessage(1);
      messages[0] = msg;
      msg.setMemoryUsage(systemUsage.getMemoryUsage());
      msg.getMessageId().setFutureOrSequenceLong(1L);
      underTest.addMessageLast(msg);

      assertTrue("cache is disabled as limit reached", !underTest.isCacheEnabled());
      assertEquals("setBatch unset", 0L, queueMessageStore.batch.get());

      int dequeueCount = 0;

      underTest.setMaxBatchSize(2);
      underTest.reset();
      while (underTest.hasNext() && dequeueCount < count) {
         MessageReference ref = underTest.next();
         ref.decrementReferenceCount();
         underTest.remove();
         LOG.info("Received message: {} with body: {}", ref.getMessageId(), ((ActiveMQTextMessage) ref.getMessage()).getText());
         assertEquals(dequeueCount++, ref.getMessageId().getProducerSequenceId());
      }
      underTest.release();
      assertEquals(count, dequeueCount);
   }

   @Test
   public void testSetBatchWithOrderedFutureCurrentFuture() throws Exception {
      final int count = 2;
      final Message[] messages = new Message[count];
      final TestMessageStore queueMessageStore = new TestMessageStore(messages, destination);
      final ConsumerInfo consumerInfo = new ConsumerInfo();
      final DestinationStatistics destinationStatistics = new DestinationStatistics();
      consumerInfo.setExclusive(true);

      final Queue queue = new Queue(brokerService, destination, queueMessageStore, destinationStatistics, null);

      queueMessageStore.start();
      queueMessageStore.registerIndexListener(null);

      QueueStorePrefetch underTest = new QueueStorePrefetch(queue, brokerService.getBroker());
      SystemUsage systemUsage = new SystemUsage();
      // ensure memory limit is reached
      systemUsage.getMemoryUsage().setLimit(messageBytesSize * 1);
      underTest.setSystemUsage(systemUsage);
      underTest.setEnableAudit(false);
      underTest.start();
      assertTrue("cache enabled", underTest.isUseCache() && underTest.isCacheEnabled());

      ActiveMQTextMessage msg = getMessage(0);
      messages[0] = msg;
      msg.setMemoryUsage(systemUsage.getMemoryUsage());
      msg.setRecievedByDFBridge(true);
      final ActiveMQTextMessage msgRef = msg;
      FutureTask<Long> future = new FutureTask<Long>(new Runnable() {
         @Override
         public void run() {
            msgRef.getMessageId().setFutureOrSequenceLong(0L);
         }
      }, 0L) {
      };
      msg.getMessageId().setFutureOrSequenceLong(future);
      Executors.newSingleThreadExecutor().submit(future);
      underTest.addMessageLast(msg);

      assertTrue("cache enabled", underTest.isUseCache() && underTest.isCacheEnabled());

      // second message will flip the cache but will be stored before the future task
      msg = getMessage(1);
      messages[1] = msg;
      msg.setMemoryUsage(systemUsage.getMemoryUsage());
      msg.setRecievedByDFBridge(true);
      final ActiveMQTextMessage msgRe2f = msg;
      FutureTask<Long> future2 = new FutureTask<Long>(new Runnable() {
         @Override
         public void run() {
            msgRe2f.getMessageId().setFutureOrSequenceLong(1L);
         }
      }, 1L) {
      };
      msg.getMessageId().setFutureOrSequenceLong(future2);
      Executors.newSingleThreadExecutor().submit(future2);
      underTest.addMessageLast(msg);

      assertTrue("cache is disabled as limit reached", !underTest.isCacheEnabled());
      assertEquals("setBatch set", 1L, queueMessageStore.batch.get());

      int dequeueCount = 0;

      underTest.setMaxBatchSize(2);
      underTest.reset();
      while (underTest.hasNext() && dequeueCount < count) {
         MessageReference ref = underTest.next();
         ref.decrementReferenceCount();
         underTest.remove();
         LOG.info("Received message: {} with body: {}", ref.getMessageId(), ((ActiveMQTextMessage) ref.getMessage()).getText());
         assertEquals(dequeueCount++, ref.getMessageId().getProducerSequenceId());
      }
      underTest.release();
      assertEquals(count, dequeueCount);
   }

   @Test
   public void testSetBatchWithFuture() throws Exception {
      final int count = 4;
      final Message[] messages = new Message[count];
      final TestMessageStore queueMessageStore = new TestMessageStore(messages, destination);
      final ConsumerInfo consumerInfo = new ConsumerInfo();
      final DestinationStatistics destinationStatistics = new DestinationStatistics();
      consumerInfo.setExclusive(true);

      final Queue queue = new Queue(brokerService, destination, queueMessageStore, destinationStatistics, null);

      queueMessageStore.start();
      queueMessageStore.registerIndexListener(null);

      QueueStorePrefetch underTest = new QueueStorePrefetch(queue, brokerService.getBroker());
      SystemUsage systemUsage = new SystemUsage();
      // ensure memory limit is reached
      systemUsage.getMemoryUsage().setLimit(messageBytesSize * (count + 6));
      underTest.setSystemUsage(systemUsage);
      underTest.setEnableAudit(false);
      underTest.start();
      assertTrue("cache enabled", underTest.isUseCache() && underTest.isCacheEnabled());

      ActiveMQTextMessage msg = getMessage(0);
      messages[0] = msg;
      msg.setMemoryUsage(systemUsage.getMemoryUsage());
      msg.setRecievedByDFBridge(true);
      final ActiveMQTextMessage msgRef = msg;
      FutureTask<Long> future0 = new FutureTask<Long>(new Runnable() {
         @Override
         public void run() {
            msgRef.getMessageId().setFutureOrSequenceLong(0L);
         }
      }, 0L) {
      };
      msg.getMessageId().setFutureOrSequenceLong(future0);
      underTest.addMessageLast(msg);
      Executors.newSingleThreadExecutor().submit(future0);

      msg = getMessage(1);
      messages[3] = msg;
      msg.setMemoryUsage(systemUsage.getMemoryUsage());
      msg.setRecievedByDFBridge(true);
      final ActiveMQTextMessage msgRef1 = msg;
      FutureTask<Long> future1 = new FutureTask<Long>(new Runnable() {
         @Override
         public void run() {
            msgRef1.getMessageId().setFutureOrSequenceLong(3L);
         }
      }, 3L) {
      };
      msg.getMessageId().setFutureOrSequenceLong(future1);
      underTest.addMessageLast(msg);

      msg = getMessage(2);
      messages[1] = msg;
      msg.setMemoryUsage(systemUsage.getMemoryUsage());
      msg.getMessageId().setFutureOrSequenceLong(1L);
      underTest.addMessageLast(msg);

      assertTrue("cache enabled", underTest.isUseCache() && underTest.isCacheEnabled());

      // out of order future
      Executors.newSingleThreadExecutor().submit(future1);

      // sync add to flip cache
      msg = getMessage(3);
      messages[2] = msg;
      msg.setMemoryUsage(systemUsage.getMemoryUsage());
      msg.getMessageId().setFutureOrSequenceLong(3L);
      underTest.addMessageLast(msg);

      assertTrue("cache is disabled as limit reached", !underTest.isCacheEnabled());
      assertEquals("setBatch set", 2L, queueMessageStore.batch.get());

      int dequeueCount = 0;

      underTest.setMaxBatchSize(count);
      underTest.reset();
      while (underTest.hasNext() && dequeueCount < count) {
         MessageReference ref = underTest.next();
         ref.decrementReferenceCount();
         underTest.remove();
         LOG.info("Received message: {} with body: {}", ref.getMessageId(), ((ActiveMQTextMessage) ref.getMessage()).getText());
         assertEquals(dequeueCount++, ref.getMessageId().getProducerSequenceId());
      }
      underTest.release();
      assertEquals(count, dequeueCount);
   }

   @Test
   public void testSetBatch() throws Exception {
      final int count = 3;
      final Message[] messages = new Message[count];
      final TestMessageStore queueMessageStore = new TestMessageStore(messages, destination);
      final ConsumerInfo consumerInfo = new ConsumerInfo();
      final DestinationStatistics destinationStatistics = new DestinationStatistics();
      consumerInfo.setExclusive(true);

      final Queue queue = new Queue(brokerService, destination, queueMessageStore, destinationStatistics, null);

      queueMessageStore.start();
      queueMessageStore.registerIndexListener(null);

      QueueStorePrefetch underTest = new QueueStorePrefetch(queue, brokerService.getBroker());
      SystemUsage systemUsage = new SystemUsage();
      // ensure memory limit is reached
      systemUsage.getMemoryUsage().setLimit(messageBytesSize * 5);
      underTest.setSystemUsage(systemUsage);
      underTest.setEnableAudit(false);
      underTest.start();
      assertTrue("cache enabled", underTest.isUseCache() && underTest.isCacheEnabled());

      ActiveMQTextMessage msg = getMessage(0);
      messages[0] = msg;
      msg.setMemoryUsage(systemUsage.getMemoryUsage());
      msg.getMessageId().setFutureOrSequenceLong(0L);
      underTest.addMessageLast(msg);

      msg = getMessage(1);
      messages[1] = msg;
      msg.setMemoryUsage(systemUsage.getMemoryUsage());
      msg.getMessageId().setFutureOrSequenceLong(1L);
      underTest.addMessageLast(msg);

      assertTrue("cache enabled", underTest.isUseCache() && underTest.isCacheEnabled());

      msg = getMessage(2);
      messages[2] = msg;
      msg.setMemoryUsage(systemUsage.getMemoryUsage());
      msg.getMessageId().setFutureOrSequenceLong(2L);
      underTest.addMessageLast(msg);

      assertTrue("cache is disabled as limit reached", !underTest.isCacheEnabled());
      assertEquals("setBatch set", 2L, queueMessageStore.batch.get());

      int dequeueCount = 0;

      underTest.setMaxBatchSize(2);
      underTest.reset();
      while (underTest.hasNext() && dequeueCount < count) {
         MessageReference ref = underTest.next();
         ref.decrementReferenceCount();
         underTest.remove();
         LOG.info("Received message: {} with body: {}", ref.getMessageId(), ((ActiveMQTextMessage) ref.getMessage()).getText());
         assertEquals(dequeueCount++, ref.getMessageId().getProducerSequenceId());
      }
      underTest.release();
      assertEquals(count, dequeueCount);
   }

   private ActiveMQTextMessage getMessage(int i) throws Exception {
      ActiveMQTextMessage message = new ActiveMQTextMessage();
      MessageId id = new MessageId(mesageIdRoot + i);
      id.setBrokerSequenceId(i);
      id.setProducerSequenceId(i);
      message.setMessageId(id);
      message.setDestination(destination);
      message.setPersistent(true);
      message.setResponseRequired(true);
      message.setText("Msg:" + i + " " + text);
      assertEquals(message.getMessageId().getProducerSequenceId(), i);
      return message;
   }

   class TestMessageStore extends AbstractMessageStore {

      final Message[] messages;
      public AtomicLong batch = new AtomicLong();

      public TestMessageStore(Message[] messages, ActiveMQDestination dest) {
         super(dest);
         this.messages = messages;
      }

      @Override
      public void addMessage(ConnectionContext context, Message message) throws IOException {

      }

      @Override
      public Message getMessage(MessageId identity) throws IOException {
         return null;
      }

      @Override
      public void removeMessage(ConnectionContext context, MessageAck ack) throws IOException {

      }

      @Override
      public void removeAllMessages(ConnectionContext context) throws IOException {

      }

      @Override
      public void recover(MessageRecoveryListener container) throws Exception {

      }

      @Override
      public int getMessageCount() throws IOException {
         return 0;
      }

      @Override
      public void resetBatching() {

      }

      @Override
      public void recoverNextMessages(int maxReturned, MessageRecoveryListener listener) throws Exception {
         for (int i = batch.intValue(); i < messages.length; i++) {
            LOG.info("recovered index:" + i);
            listener.recoverMessage(messages[i]);
         }
      }

      @Override
      public void setBatch(MessageId message) {
         batch.set((Long) message.getFutureOrSequenceLong());
         batch.incrementAndGet();
      }

   }
}
