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| // BigDataPullConsumer.java
package org.apache.rocketmq.example.simple.litepull;
import org.apache.rocketmq.client.consumer.DefaultLitePullConsumer;
import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.common.consumer.ConsumeFromWhere;
import org.apache.rocketmq.common.message.MessageExt;
import org.apache.rocketmq.common.message.MessageQueue;
import org.apache.rocketmq.common.protocol.heartbeat.MessageModel;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.*;
import java.util.stream.Collectors;
public class BigDataPullConsumer {
private final ExecutorService executorService = new ThreadPoolExecutor(30, 30, 0L,
TimeUnit.SECONDS, new ArrayBlockingQueue<>(10000), new DefaultThreadFactory("business-executer-
"));
private final ExecutorService pullTaskExecutor = new ThreadPoolExecutor(1, 1, 0L,
TimeUnit.SECONDS, new ArrayBlockingQueue<>(10), new DefaultThreadFactory("pull-batch-"));
private String consumerGroup;
private String nameserverAddr;
private String topic;
private String filter;
private MessageListener messageListener;
private DefaultMQProducer rertyMQProducer;
private PullBatchTask pullBatchTask;
public BigDataPullConsumer(String consumerGroup, String nameserverAddr, String topic, String filter) {
this.consumerGroup = consumerGroup;
this.nameserverAddr = nameserverAddr;
this.topic = topic;
this.filter = filter;
initRetryMQProducer();
}
private void initRetryMQProducer() {
this.rertyMQProducer = new DefaultMQProducer(consumerGroup + "-retry");
this.rertyMQProducer.setNamesrvAddr(this.nameserverAddr);
try {
this.rertyMQProducer.start();
} catch (Throwable e) {
throw new RuntimeException("启动失败", e);
}
}
public void registerMessageListener(MessageListener messageListener) {
this.messageListener = messageListener;
}
public void start() {
//没有考虑重复调用问题
this.pullBatchTask = new PullBatchTask(consumerGroup, nameserverAddr, topic,filter,messageListener);
pullTaskExecutor.submit(this.pullBatchTask);
}
public void stop() {
while(this.pullBatchTask.isRunning()) {
try {
Thread.sleep(1 * 1000);
} catch (Throwable e) {
//ignore
}
}
this.pullBatchTask.stop();
pullTaskExecutor.shutdown();
executorService.shutdown();
try {
//等待重试任务结束
while(executorService.awaitTermination(5, TimeUnit.SECONDS)) {
this.rertyMQProducer.shutdown();
break;
}
} catch (Throwable e) {
//igonre
}
}
/**
* 任务监听
*/
static interface MessageListener {
boolean consumer(List<MessageExt> msgs);
}
/**
* 定时调度任务,例如每 10 分钟会被调度一次
*/
class PullBatchTask implements Runnable {
DefaultLitePullConsumer consumer;
String consumerGroup;
String nameserverAddr;
String topic;
String filter;
private volatile boolean running = true;
private MessageListener messageListener;
public PullBatchTask(String consumerGroup, String nameserverAddr,String topic, String filter,
MessageListener messageListener) {
this.consumerGroup = consumerGroup;
this.nameserverAddr = nameserverAddr;
this.topic = topic;
this.filter = filter;
this.messageListener = messageListener;
init();
}
private void init() {
System.out.println("init 方法被调用");
consumer = new DefaultLitePullConsumer(this.consumerGroup);
consumer.setNamesrvAddr(this.nameserverAddr);
consumer.setAutoCommit(true);
consumer.setMessageModel(MessageModel.CLUSTERING);
consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
try {
consumer.subscribe(topic, filter);
consumer.start();
} catch (Throwable e) {
e.printStackTrace();
}
}
public void stop() {
this.running = false;
this.consumer.shutdown();
}
public boolean isRunning() {
return this.running;
}
@Override
public void run() {
this.running = true;
long startTime = System.currentTimeMillis() - 5 * 1000;
System.out.println("run 方法被调用");
int notFoundMsgCount = 0;
while(running) {
try {
// 拉取一批消息
List<MessageExt> messageExts = consumer.poll();
if(messageExts != null && !messageExts.isEmpty()) {
notFoundMsgCount = 0;//查询到数据,重置为 0;
// 使用一个业务线程池专门消费消息
try {
executorService.submit(new ExecuteTask(messageExts, messageListener));
} catch (RejectedExecutionException e) { //如果被拒绝,停止拉取,业务代码不去拉取,在
// RocketMQ 内部会最终也会触发限流,不会再拉取更多的消息,确保不会触发内存溢出。
boolean retry = true;
while (retry)
try {
Thread.sleep(5 * 1000);//简单的限流
executorService.submit(new ExecuteTask(messageExts, messageListener));
retry = false;
} catch (RejectedExecutionException e2) {
retry = true;
}
}
MessageExt last = messageExts.get(messageExts.size() - 1);
/**
* 如果消息处理的时间超过了该任务的启动时间,本次批处理就先结束
* 停掉该消费者之前,建议先暂停拉取,这样就不会从 broker 中拉取消息
* */
if(last.getStoreTimestamp() > startTime) {
System.out.println("consumer.pause 方法将被调用。");
consumer.pause(buildMessageQueues(last));
}
} else {
notFoundMsgCount ++;
}
//如果连续出现 5 次未拉取到消息,说明本地缓存的消息全部处理,并且 pull 线程已经停止拉取了,此时可以结束本次消
//息拉取,等待下一次调度任务
if(notFoundMsgCount > 5) {
System.out.println("已连续超过 5 次未拉取到消息,将退出本次调度");
break;
}
} catch (Throwable e) {
e.printStackTrace();
}
}
this.running = false;
}
/**
* 构建 MessageQueue
* @param msg
* @return
*/
private Set<MessageQueue> buildMessageQueues(MessageExt msg) {
Set<MessageQueue> queues = new HashSet<>();
MessageQueue queue = new MessageQueue(msg.getTopic(), msg.getBrokerName(), msg.getQueueId());
queues.add(queue);
return queues;
}
}
/**
* 任务执行
*/
class ExecuteTask implements Runnable {
private List<MessageExt> msgs;
private MessageListener messageListener;
public ExecuteTask(List<MessageExt> allMsgs, MessageListener messageListener) {
this.msgs = allMsgs.stream().filter((MessageExt msg) -> msg.getReconsumeTimes() <=
16).collect(Collectors.toList());
this.messageListener = messageListener;
}
@Override
public void run() {
try {
this.messageListener.consumer(this.msgs);
} catch (Throwable e) {
//消息消费失败,需要触发重试
//这里可以参考 PUSH 模式,将消息再次发送到服务端。
try {
for(MessageExt msg : this.msgs) {
msg.setReconsumeTimes(msg.getReconsumeTimes() + 1);
rertyMQProducer.send(msg);
}
} catch (Throwable e2) {
e2.printStackTrace();
// todo 重试
}
}
}
}
}
// DefaultThreadFactory.java
package org.apache.rocketmq.example.simple.litepull;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;
public class DefaultThreadFactory implements ThreadFactory {
private AtomicInteger num = new AtomicInteger(0);
private String prefix;
public DefaultThreadFactory(String prefix) {
this.prefix = prefix;
}
@Override
public Thread newThread(Runnable r) {
Thread t = new Thread(r);
t.setName(prefix + num.incrementAndGet());
return t;
}
}
// LitePullMain.java
package org.apache.rocketmq.example.simple.litepull;
import org.apache.rocketmq.common.message.MessageExt;
import java.util.List;
import java.util.concurrent.*;
public class LitePullMain {
public static void main(String[] args) {
String consumerGroup = "dw_test_consumer_group";
String nameserverAddr = "192.168.3.166:9876";
String topic = "dw_test";
String filter = "*";
/** 创建调度任务线程池 */
ScheduledExecutorService schedule = new ScheduledThreadPoolExecutor(1, new
DefaultThreadFactory("main-schdule-"));
schedule.scheduleWithFixedDelay(new Runnable() {
@Override
public void run() {
BigDataPullConsumer demoMain = new BigDataPullConsumer(consumerGroup, nameserverAddr, topic,
filter);
demoMain.registerMessageListener(new BigDataPullConsumer.MessageListener() {
/**
* 业务处理
* @param msgs
* @return
*/
@Override
public boolean consumer(List<MessageExt> msgs) {
System.out.println("本次处理的消息条数:" + msgs.size());
return true;
}
});
demoMain.start();
demoMain.stop();
}
}, 1000, 30 * 1000, TimeUnit.MILLISECONDS);
try {
CountDownLatch cdh = new CountDownLatch(1);
cdh.await(10 , TimeUnit.MINUTES);
schedule.shutdown();
} catch (Throwable e) {
//ignore
}
}
}
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