Hi,

Your question is a bit ambiguous. So I answer to both understanding :

1/ if you talk about locking (synchronized)
The browser do not use several thread for executing the Javascript.
Then you do not have problem of synchronization.
Simply use a local variables to remember which calls are finished.

2/ if you want to do a synchronous call to the server
With GWT all calls to a service on server are asynchronous. Therefore
to do a task after the end of call you have to write the code in the
callback. Therefore your code is split in two parts :

private void m1() {
  // first part of code
  ...
  // call to the server
  MyService.Util.getInstance().myRemoteMethod("hello world", new
AsyncCallBack() {
      public void onSuccess(Object result) {
          //second part of the code executed only after the remote
call
      }
      public void onFailure(Throwable problem) {
          //second part of the code executed only after the remote
call
      }
  } );
  //in most case do nothing here because you do not know when it is
executed with regards to the
} //end of m1

The code corresponding to the onSuccess (or onFailure) can also be
written into a separated method in order to the readability of your
code. Your code is therefore divided in two method. I advice you to
read the GWT doc :
http://code.google.com/webtoolkit/documentation/com.google.gwt.doc.DeveloperGuide.RemoteProcedureCalls.html


Regards,
Seb
On Apr 24, 10:45 am, "oualaa hani" <oualaa....@gmail.com> wrote:
> Hi,
>
> Please I want know how cn do synchronous call
>
> Thank you.

Aye aye!  I second asynchronicity! If, for some reason, you want pseudo-synchronicity, just add a fulll screen, position:absolute;left:0;top:0;width:100%;height:100%;opacity:0.77;filter:Alpha(77);z-index:777777; div when the request is sent {maybe even include a tasty loading or sending message}, and remove the div when the response returns.

I use this method when the user posts a new entry, and I want my server to make sure it's properly saved before the user starts playing with certain parts of the app...  Like, editing their saved documents... Because I don't want anybody to start requesting a file I haven't saved yet...




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