Asynchronous resources

The following example shows a simple asynchronous resource method using the new JAX-RS async features:

@GET
@Path("/simple")
publicvoid asyncGet(@SuspendedfinalAsyncResponseasyncResponse) {
   new Thread(new Runnable() {
      @Override
      publicvoid run() {
   String result = veryExpensiveOperation();
asyncResponse.resume(result);
   }
private String veryExpensiveOperation() {
returnnew MagicNumber(3) + "";
}
}).start();
}

We have a JAX-RS AsyncResponse class passed as an attribute to a GET method implementation, asyncGet. This method injects an instance of AsyncResponse using the javax.ws.rs.container.Suspended annotation.

This annotation is very similar to the javax.ws.rs.core.Context annotation. The @Context annotation allows us to inject a REST response. The @Suspend annotation does the same with the difference, it declares the resource as part of an asynchronous operation too.

Asynchronous is when a thread is different when starting the thread end operation....