I have had a reply to another thread which indicated that I had
misunderstood how the coding for ths async call was working... I
include the explaination below for completeness, incase anyone else
has the same problem. and finds this thread rather than my other
thread!!
> > > private String GetOneContact(String Name) {
> > > ContactService = GWT.create(ContactService.class);
> > > ContactService.getoneContact(Name,new AsyncCallback<String>()
> > > {
> > > public void onFailure(Throwable error) {
> > > PhoneResult="ERROR";
> > > }
> > > public void onSuccess(String Phone) {
> > > PhoneResult=Phone;
***********This area of the code is what happens immediately after the
asynccallback completes successfully
> > > }
> > > });
> > > return (PhoneResult);
***********This area of the code actually gets executed immediately
after the AsyncCallback is initiated, and as such can happen before
the code above!!
> > > }
On Aug 25, 10:35 pm, John V Denley <[email protected]> wrote:
> Ahhhh, after some investigation, looks like what im doing is
> initiating an asynchronous request to the server, and then not waiting
> long enough for the reply, hence why im getting the reply whenever i
> make the second request....
>
> Can anyone tell me how i can make sure i get the reply ive asked for?
> what am i missing here?
>
> Thanks,
> John
>
> On Aug 25, 7:30 pm, John V Denley <[email protected]> wrote:
>
> > OK, after a little further investigation Ive confirmed now that the
> > client side function is taking in the correct search name, the problem
> > is certainly that the server side appears to be receiving the previous
> > request.
>
> > Ive changed the returns in both functions such that i now get the
> > following:
>
> > john:null
> > paul:(john)john:1111
> > john:(paul)paul:2222
>
> > where the format is:
> > input to client function : (input to server function):name of found
> > contact from query:phone of found contact from query
>
> > Thanks,
> > John
>
> > On Aug 25, 6:23 pm, John V Denley <[email protected]> wrote:
>
> > > Ive implemented the stockwatcher application and have adjusted it so
> > > that it stores names and phone numbers. That all seems to be working
> > > ok, however Ive now implemented a "get" function which looks for a
> > > name, and returns a phone number. However, whats happening is that the
> > > first search i do returns nothing, then if i search for the same name
> > > again, then it returns the correct phone number, then if i search for
> > > another name, it returns the first name's phone instead.
>
> > > eg I have the following data in the datastore:
>
> > > john 1111
> > > paul 2222
>
> > > i request the phone number for john and i get back ""
> > > I request the phone number for paul and i get back "1111"
> > > I request the phone number for john and i get back "2222"
>
> > > Client side Java file contains:
>
> > > private String GetOneContact(String Name) {
> > > ContactService = GWT.create(ContactService.class);
> > > ContactService.getoneContact(Name,new AsyncCallback<String>()
> > > {
> > > public void onFailure(Throwable error) {
> > > PhoneResult="ERROR";
> > > }
> > > public void onSuccess(String Phone) {
> > > PhoneResult=Phone;
> > > }
> > > });
> > > return (PhoneResult);
> > > }
>
> > > Server side (ContactServiceImpl.java) contains:
>
> > > public String getoneContact(String Name) throws NotLoggedInException
> > > {
> > > checkLoggedIn();
> > > String Phone="x";
> > > PersistenceManager pm = getPersistenceManager();
> > > try {
> > > //Query q = pm.newQuery(Contact.class, "user == u &&
> > > Name==n");
> > > Query q = pm.newQuery(Contact.class, "user == u");
> > > q.declareParameters("com.google.appengine.api.users.User
> > > u");
> > > //q.declareParameters("John n");
> > > List<Contact> Contacts = (List<Contact>) q.execute(getUser
> > > ());
> > > for (Contact contact : Contacts) {
> > > if (Name.equals(contact.getName()))
> > > {Phone=contact.getPhone
> > > ();}
> > > }
>
> > > } finally {
> > > pm.close();
> > > }
> > > return (Phone);
> > > }
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