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Create Asynchronous Callback Service Implementation

by on

Content

  1. Mock Class Sketch (Almost Diagram) of Callback Service
  2. Mock Sketch of Callback Proxy Services
  3. Fix Error While Creating Asynchronous Services
SampleService
^
| composedof
SampleServiceAsync (interface)

o We create the asynchronous Sample Service
o On the Client Side GWT creates stubs and the necessary
o Here is the code we should create in the com.sample.client package:

 
public interface SampleServiceAsync {
	void getMessage(AsyncCallback callback);
}
SampleServiceAsync
^
| implements
GWT Proxy Stuff

ServiceDefTarget (interface)
^
| implements
GWT Proxy Stuff

o GWT creates a proxy of our service by create the service
instances for ServiceDefTarget

o In eclipse, an red x error appears, on the left of the Java code.
o Click the red x, a popup appears, indicating it will
“Create asynchronous remote service…”
o The New Asynchronous Remote Service panel appears
o Click: Finish
o The SampleServiceAsync interface is created with this method:

void getMessage(AsyncCallback callback);
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