finish the RPC call befor the execution of other methods or code?

[learning coding]

HI all

 

I am doing web application Project in GWT. I am using RPC, which is working fine.

I have 4 packeages

1. .client
2. .client.GUI
3. .client.control
4. .shared
5. .server

From .gui.loginpage

On onClickmethod of a button I make a object of Login Class which is in client.control

onSuccess of RPC public Boolean setConnection(true)

but when i try to getConnectionform .gui.loginpage its show me null.

because the call back function is executed asynchronously, the function is invoked after the response comes to the browser from the server.

But the other part of the code is executed immediately by which time connection is still null.

I need a solution or a method or any logic so that other function waits till the rpc call is complete.

 

Thanks

 

[Jens]

You have to convert your code to use a callback:

Instead of:

void onClick() {

  myObject.doSomethingAsync(xyz);

  myObject.getConnection();

  //additional code

}

convert it to:

void onClick() {

  myObject.doSomethingAsync(xyz, new Callback() {

    void onSuccess() {

      myObject.getConnection();

      //additional code

    }

  });

}

void doSomethingAsync(Object o, Callback cb) {

  serverService.rpcMethod(o, new AsyncCallback<Object> {

    void onSuccess(Object result) {

      setConnection(true);

      cb.onSuccess(); //notify caller via its callback

    }

  }

}

Alternatively you can use two events (one event results in execution of the async method and the second one will be fired when the async request has been finished).

-- J.

[learning coding]

Ya i did that before but somebody told me that this is not good way coding.

As I am new to coding i dont understand the complexity iissues much during coding.

 

here is my piece of code.

 .client.GUI

public Class GUi(){ 
 // More Code 
 
public void onClick(ClickEvent event) { 
 
LoginServer loginServer =new  LoginServer(getTextBoxUsername().getText(),getTextBoxPassword().getText());      
loginServer.setConnection(connection); 
connection=loginServer.getConnection(); 
// More code 
} 

}

 

client.control

 

public class LoginServer { 
// more code 
public void setConnection(Boolean connection) { 
 
    String[] authentication = {username,password}; 
    //RPC call 
    connectionService.connectionServer(authentication, callbackConnection);  
   

     System.out.println("setConnection" + connection); 
} 
 
public Boolean getConnection() { 
    return connection; 
} 
AsyncCallback callbackConnection = new AsyncCallback() { 
 
    public void onFailure(Throwable caught) { 
        // TODO Auto-generated method stub 
        connection=false; 
    } 
 
    public void onSuccess(Object result) { 
        connection=true; 
        System.out.println("onSuccess + connection); 
 
    } 
}; 
 
} 

 

help me to solve this.

 

thanks

 

 

 

 

 

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