How to use BatchAction ?

[Justin Coutarel]

Good morning all,

I’m trying to use BatchAction to fetch differents objects from my server within one single server call.
I’ve write the following code:

Action<BatchResult> batchAction = new BatchAction(OnException.CONTINUE, new ActionA(), new ActionB()) {

            @Override
            public String getServiceName() {
                return DEFAULT_SERVICE_NAME;
            }

            @Override
            public boolean isSecured() {
                return false;
            }
           
  };

dispatchAsync.execute(batchAction, new AsyncCallback<BatchResult>() {

            @Override
            public void onFailure(Throwable caught) {
                Window.alert("Error: " + caught.getMessage());
            }
       
            @Override
            public void onSuccess(BatchResult result) {
                Window.alert("Successfull !");
 
 });

 
Obviously, ActionA and ActionB are actions and if I execute this actions separately, they work. The callback onFailure method is called without make a server call with a null caught parameter.

Could you tell me why my code doesn’t work or give me a working example ?

Thank you very much

P.S.: Sorry for my bad English, I'm french.

 

[Justin Coutarel]

I understood the problem. I used an anonymous class, but GWT cannot serialize it and it throw an exception without message (null) and then onFailure is called with null message.

So, I created a class that extends the BatchAction class but GWTP throw an exception because there is no handler registered for handle this action.

Thus, I created a facade class that creates an BatchActionHandler and calls the execute method. I bound this class to the my batch action with the bindHandler method.

The BatchAction class:

public class MyBatchAction extends BatchAction {


    MyBatchAction() {
        super(OnException.CONTINUE, new ActionA(), new ActionB());

    }


    @Override
    public String getServiceName() {
        return DEFAULT_SERVICE_NAME;
    }


    @Override
    public boolean isSecured() {
        return false;
    }
}

The BatchActionHandler class:

public class MyBatchActionHandler implements ActionHandler<MyBatchAction, BatchResult> {
   
    BatchActionHandler handler = new BatchActionHandler();


    @Override
    public BatchResult execute(MyBatchAction action, ExecutionContext context) throws ActionException {
        return handler.execute(action, context);
    }


    @Override
    public Class<MyBatchAction> getActionType() {
        return MyBatchAction.class;
    }


    @Override
    public void undo(MyBatchAction action, BatchResult result, ExecutionContext context) throws ActionException {
        handler.undo(action, result, context);
    }
}

And My ServerModule class:

public class ServerModule extends HandlerModule {


    @Override
    protected void configureHandlers() {


        bindHandler(ActionA.class, ActionAHandler.class);


        bindHandler(ActionB.class, ActionBHandler.class);
       
        bindHandler(MyBatchAction.class, MyBatchActionHandler.class);
    }
}

My problem is solved. If anyone have a better solution, he can suggest me :-)

P.S.: Again, sorry for my bad English, I'm french

[Christopher Viel]

Good to know. I'm curious if this one would work without the hassle of a facade though:

public class ServerModule extends HandlerModule {

  @Override

  protected void configureHandlers() {

    bindHandler(ActionA.class, ActionAHandler.class);

    bindHandler(ActionB.class, ActionBHandler.class);

    bindHandler(BatchAction.class, BatchActionHandler.class);
  }

}

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