时间：2023-03-08 12:02:45 | 栏目：Redis | 点击：次
首先说明下需求，一个用户中心产品，用户在试用产品有三天的期限，三天到期后准时准点通知用户，试用产品到期了。这个需求如果不是准时通知，而是每天定点通知就简单了。如果需要准时通知就只能上延迟队列了。使用场景除了如上，典型的业务场景还有电商中的延时未支付订单失效等等。
怎么封装便于业务使用。
1.首先定义一个延迟job，里面包含一个map参数，和队列执行器的具体实现class，触发任务执行时，map参数会被传递到具体的业务执行器实现内
/**
* Created by kl on 2018/7/20.
* Content :延时job
*/
public class DelayJob {
private Map jobParams;//job执行参数
private Class aClass;//具体执行实例实现
}
2.定义一个延迟job执行器接口，业务需要实现这个接口，然后在execute方法内写自己的业务逻辑
/**
* Created by kl on 2018/7/20.
* Content :延时job执行器接口
*/
public interface ExecuteJob {
void execute(DelayJob job);
}
3.消费已经到点的延时job服务，通过job参数调用业务执行器实现
@Component
public class JobTimer {
static final String jobsTag = "customer_jobtimer_jobs";
@Autowired
private RedissonClient client;
@Autowired
private ApplicationContext context;
ExecutorService executorService = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors() * 2);
@PostConstruct
public void startJobTimer() {
RBlockingQueueblockingQueue = client.getBlockingQueue(jobsTag);
new Thread() {
@Override
public void run() {
while (true) {
try {
DelayJob job = blockingQueue.take();
executorService.execute(new ExecutorTask(context, job));
} catch (Exception e) {
e.printStackTrace();
try {
TimeUnit.SECONDS.sleep(60);
} catch (Exception ex) {
}
}
}
}
}.start();
}
class ExecutorTask implements Runnable {
private ApplicationContext context;
private DelayJob delayJob;
public ExecutorTask(ApplicationContext context, DelayJob delayJob) {
this.context = context;
this.delayJob = delayJob;
}
@Override
public void run() {
ExecuteJob service = (ExecuteJob) context.getBean(delayJob.getaClass());
service.execute(delayJob);
}
}
}
4.封装延时job服务
/**
* Created by kl on 2018/7/20.
* Content :延时job服务
*/
@Component
public class DelayJobService {
@Autowired
private RedissonClient client;
public void submitJob(DelayJob job, Long delay, TimeUnit timeUnit){
RBlockingQueueblockingQueue = client.getBlockingQueue(JobTimer.jobsTag);
RDelayedQueue delayedQueue = client.getDelayedQueue(blockingQueue);
delayedQueue.offer(job,delay,timeUnit);
}
}