/**
* Copyright (C) 2010-2013 Alibaba Group Holding Limited
*
* 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
*
* 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 com.alibaba.rocketmq.example.simple;
import java.util.List;
import java.util.concurrent.atomic.AtomicLong;
import com.alibaba.rocketmq.client.consumer.DefaultMQPushConsumer;
import com.alibaba.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
import com.alibaba.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
import com.alibaba.rocketmq.client.consumer.listener.MessageListenerConcurrently;
import com.alibaba.rocketmq.client.exception.MQClientException;
import com.alibaba.rocketmq.common.message.MessageConst;
import com.alibaba.rocketmq.common.message.MessageExt;
/**
* PushConsumer，订阅消息
*/
public class PushConsumer {
public static void main(String[] args) throws InterruptedException, MQClientException {
DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("please_rename_unique_group_name_6");
/**
* 订阅指定topic下所有消息
*/
// consumer.subscribe("TopicTest", "*");
/**
* 订阅指定topic下tags分别等于TagA或TagC或TagD
*/
consumer.subscribe("TopicTest", "TagA || TagC || TagD");
consumer.registerMessageListener(new MessageListenerConcurrently() {
AtomicLong consumeTimes = new AtomicLong(0);
@Override
public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,
ConsumeConcurrentlyContext context) {
long offset = msgs.get(0).getQueueOffset();
String maxOffset = msgs.get(0).getProperty(MessageConst.PROPERTY_MAX_OFFSET);
long diff = Long.parseLong(maxOffset) - offset;
if (diff > 100000) {
// TODO 消息堆积情况的特殊处理
// return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
}
System.out.println(Thread.currentThread().getName() + " Receive New Messages: " + msgs);
this.consumeTimes.incrementAndGet();
if ((this.consumeTimes.get() % 2) == 0) {
return ConsumeConcurrentlyStatus.RECONSUME_LATER;
}
else if ((this.consumeTimes.get() % 3) == 0) {
context.setDelayLevelWhenNextConsume(5);
return ConsumeConcurrentlyStatus.RECONSUME_LATER;
}
return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
}
});
consumer.start();
System.out.println("Consumer Started.");
}
}