how to wait for a certain callback method to be called before a function returns in java?

Question

I am writing a phonegap plugin.My code outline is this

public PluginResult execute(String action, JSONArray arg1, String arg2) {
      try{
        if (action.equals("authenticate")) {
           this.startlogin();
           return new PluginResult(PluginResult.Status.OK);
        }
        else {
            return new PluginResult(PluginResult.Status.INVALID_ACTION);
        }
       }catch(Exception e){}
            return new PluginResult(PluginResult.Status.JSON_EXCEPTION); 

    }

startlogin() method calls a function which has callback method registered which gets called after certain event.ie startlogin() method returns but a certain method is called after an event occurs which is asynchronous.

 public void startlogin(){

    login();//this has callback method
 }

how to wait until that callback method is finished before i return from execute method? Whats the best method in java?

PS:I cannot change execute method prototype since phonegap plugin works on execute method.

Answer 1

Easiest approach:

if (this.startlogin()) ...

...

public boolean startlogin(){

    return login();
}

Answer 2

It seems to me that you're trying to mix synchronous with asynchronous...

What you should really do is have the callback method return the PluginResult.

Cheers,