content: /**
   * Copyright (C) 2010-2016 Alibaba Group Holding Limited
   * <p>
   * Licensed 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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * 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 com.aliyun.openservices.tcp.example.consumer;
  
  import com.aliyun.openservices.ons.api.Action;
  import com.aliyun.openservices.ons.api.ConsumeContext;
  import com.aliyun.openservices.ons.api.Message;
  import com.aliyun.openservices.ons.api.ONSFactory;
  import com.aliyun.openservices.ons.api.PropertyKeyConst;
  import com.aliyun.openservices.ons.api.batch.BatchConsumer;
  import com.aliyun.openservices.ons.api.batch.BatchMessageListener;
  import com.aliyun.openservices.tcp.example.MqConfig;
  import java.util.List;
  import java.util.Properties;
  import java.util.concurrent.CountDownLatch;
  
  /**
   * MQ 接收消息示例 Demo
   */
  public class TimedBatchMQConsumer {
  
      public static void main(String[] args) {
          Properties consumerProperties = new Properties();
          consumerProperties.setProperty(PropertyKeyConst.GROUP_ID, MqConfig.GROUP_ID);
          consumerProperties.setProperty(PropertyKeyConst.AccessKey, MqConfig.ACCESS_KEY);
          consumerProperties.setProperty(PropertyKeyConst.SecretKey, MqConfig.SECRET_KEY);
          consumerProperties.setProperty(PropertyKeyConst.NAMESRV_ADDR, MqConfig.NAMESRV_ADDR);
          consumerProperties.setProperty(PropertyKeyConst.InstanceName, "batch_consumer_demo");
          // Wait until size of message batch grows to 20
          consumerProperties.setProperty(PropertyKeyConst.ConsumeMessageBatchMaxSize, "20");
          // Await at most 10s before firing consumption of message batch
          consumerProperties.setProperty(PropertyKeyConst.BatchConsumeMaxAwaitDurationInSeconds, "10");
          BatchConsumer consumer = ONSFactory.createBatchConsumer(consumerProperties);
  
          final CountDownLatch latch = new CountDownLatch(3);
  
          consumer.subscribe(MqConfig.TOPIC, MqConfig.TAG, new BatchMessageListener() {
              @Override
              public Action consume(List<Message> list, ConsumeContext context) {
                  System.out.println("Received and committed " + list.size() + " messages.");
                  latch.countDown();
                  return Action.CommitMessage;
              }
          });
          consumer.start();
          System.out.println("Consumer start success.");
  
          try {
              latch.await();
              System.out.println("Should have consumed 3 batch-of-message. Shutting consumer down...");
          } catch (InterruptedException e) {
              System.err.println("Interrupted. Shutting consumer down...");
          }
          consumer.shutdown();
      }
  }
  