如何通知消费者工作完成生产者工作? [英] How do I notify a Consumer job that Producer job is done?

问题描述

使用Spring/Quartz，我有一个ProducerJob，它首先运行.然后，我有一个ConsumerJob，它必须等待ProducerJob(在数据库中创建记录)的结果.

Using Spring/Quartz, I have an ProducerJob that is run first. Then I have a ConsumerJob that must wait for the result of ProducerJob (which creates records in the DB).

如何将ProducerJob的结果通知给ConsumerJob?我应该让ConsumerJob不断检查数据库，还是在ProducerJob尚未完成时进入睡眠/等待状态?

What's the best way for ConsumerJob to be notified of the results of ProducerJob? Should I let ConsumerJob to constantly check the database, and sleep/wait if ProducerJob is not yet done?

我意识到我的问题可能类似于Quartz JobDataMap中的 Pass BlockingQueue ，尽管未确定具体的实现方式.仍然没有得到实现的方式.

I realize my question may be similar to Pass BlockingQueue in JobDataMap of Quartz, although no specific implementation was identified. Still not getting how this would be implemented though.

推荐答案

在生产者/消费者模式中，消费者必须等待生产者提供的数据.如果要使用数据库解耦这两种方法，则使用者必须轮询.是的.另一种解决方案是使用BlockingQueue并让使用者编写数据库条目.这将减少数据库负载，并且很容易实现.生产者的速度更快，这通常是使用此模式的原因.

In the Producer/Consumer pattern the consumer has to wait for the data the producer prduces. If you want to decouple both using a database, the consumer has to poll. Yes. Another solution is to use a BlockingQueue and let the consumer write the database entries. This would reduce database load and is propably simpler to implement. And the producer is mutch faster, which is often a reason to use this pattern.

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