How do I execute a method of a Java class from x in x time in WebLogic?
From what I've been checking, there's the possibility of using the @Schedule annotation in the (Java EE 6) method. But as I'm using Java EE 5, this annotation does not work. Is there another way to do without the @Schedule annotation?
I've had to do something very similar to what you're requesting. Within the WebLogic 10.3 application server of 10 in 10 seconds connect to a JMS Topic and consume messages from this topic. I had to do this within the WebLogic server, and I did not use features directly from the Java EE platform, but from SE (Java SE).
Well, there are two ways, first in Startup of your application to create a callback
or
In EJB that will call the method that initializes, if you have one. You create a method with the @PostContruct annotation , this method will be called callback from creating your EJB .
In both the callback of the WebLogic Startup and in the creation of the EJB you create a Pool with a Thread or more that will execute your logic of accessing services or executing your business methods. This Pool is a specialized pool that will periodically perform its tasks, here's the example:
public static void main(String... args){
ScheduledExecutorService scheduledExecutorService =
Executors.newScheduledThreadPool(1);
ScheduledFuture scheduledFuture =
scheduledExecutorService.schedule(new Callable() {
public Object call() throws Exception {
System.out.println("Executed!");
return "Called!";
}
},
10,
TimeUnit.SECONDS);
}
In the code above a Pool is created with a Thread, and a task, which in this case is a Callable instance - Running every 10 seconds.
Consider the shutdown method
In the case of EJB, you can define a preDestroy method, which should be annotated with the @PreDestroy annotation - so you can stop execution. To do this, use the Shutdown method
scheduledExecutorService.shutdown();
This is the Executors Framework, a powerful Java Platform Framework, added in version 1.5 SE.
Please read the Class Javadocs: link