开始&使用 servlet 在 Java EE 环境中停止 ScheduledExecutorService [英] Start & Stop a ScheduledExecutorService in Java EE environment using servlet

问题描述

我们有一个需求，我们需要使用一个简单的 servlet 应用程序通过 JMX 监视远程 JVM 详细信息.所以到目前为止在独立应用程序中完成的事情是

We have a requirement where in we need to monitor remote JVM details via JMX using a simple servlet application. So things done till now in a standalone application is

1) 创建一个 JMX 连接器 &获取内存数据 --> 完成2)我们需要不断地监控和;获取记录(2.1 > 可以将其视为固定延迟的计划任务并将记录插入 DB 或 2.2> 如果是，JMX 是否提供历史记录，如果是，要访问哪个 MBean 以获取信息?).

1) Creat a JMX connector & get the Memory data --> done 2) We need to constantly monitor & get the records (2.1 > which can be considered as scheduled task at constant delay & insert the records into DB Or 2.2> does the JMX gives the history if yes which MBean to access for the info?).

这里我打算用一个接口来注册域，接着就可以了.有开始&JSP 中的停止按钮.当我们点击开始时，系统将运行调度程序 (ScheduledExecutorService) &在后台捕获记录以提供历史记录.当用户点击停止时，调度程序必须停止后台进程.问题是我们如何控制 &获取调度程序的对象?

Here I am planning to use an interface to register the domain , followed to it. Have start & stop button from JSP. The functionality been when we click start the system will run the scheduler (ScheduledExecutorService ) & capture the records at background to give the history. When the uses clicks stop the scheduler has to stop the background process. The question is how can we control & get the object of a scheduler ?

1) 换句话说，我们如何开始 &通过 servlet 停止 ScheduledExecutorService ?从一个 servlet & 启动一个线程停止来自另一个 servlet 的线程以执行特定任务?

1) In other words how can we start & stop a ScheduledExecutorService via servlets ? start a thread from one servlet & stop a thread from another servlet for a particular task ?

2) 如果我们有一个集群/负载平衡环境怎么办?

2) What if we have a clustered/load balanced environment ?

目前正在考虑将每个 ScheduledExecutorService 添加到 HashMap 中，关键是任务对象 &值是使用 SingleTon 设计模式的 ScheduledExecutorService.是否有任何默认方法.SingleTon 的整个循环处于集群/负载平衡环境中，我们可能无法获得适当的更新对象.

Currently am thinking of adding each ScheduledExecutorService into HashMap , key been the task object & value been the ScheduledExecutorService using SingleTon desgin pattern. Is there any default approach. The loop whole with SingleTon is in clustered/load balanced environment we may not be able to get the appropriate update objects.

期待您的宝贵建议.

推荐答案

如果在 java ee 7 上，请尝试使用 javax.enterprise.concurrent.ManagedScheduledExecutorService

If on java ee 7, try using the javax.enterprise.concurrent.ManagedScheduledExecutorService

然后就可以做一个资源注入，用类似下面的代码启动任务.

Then you can do a resource injection and start the task with code similiar to below.

@Resource
ManagedScheduledExecutorService mses;

public void startTask() {
    mses.scheduleAtFixedRate(runnable, 10, 10, SECONDS);
}

在 Java EE 6 中，您可以使用 定时器服务 API

In Java EE 6 you could have a servlet create/remove using the timerservice API

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