Sleeping An Application In Java

Some applications need to pause execution for a short amount of time. In App Engine, there are two ways to do that.

For short pauses, most programming languages have the concept of sleep operations. Here’s how to sleep for 2,000 milliseconds (2 seconds) in Java:

try {
catch (InterruptedException e) {

If you want to pause the application for a few seconds, using the sleep function is a good idea. But if you need a longer pause – more than a minute or so – it’s a better idea to use the Task Queue’s countdownMillis function.

Here’s how to create a task that will wait for 5 minutes, then launch off another request:

TaskOptions task = TaskOptions.Builder.withCountdownMillis(5 * 60 * 1000);

In short, whenever you need a long pause in execution, queue up a task with a countdownMillis() delay. Then the task can call a request handler which can continue any application logic needed.