On Nov 17, 10:56 am, Ian Bambury <ianbamb...@gmail.com> wrote:
> The problem with that is that you have to wait for call A to return before
> initiating call B. What if you have 5 or 6 calls. Or the user can submit
> different bits as and when?
>
> The best way is to make a single rpc call which does everything you want out
> of A and B when everything is ready.
>
> If there are too many combinations, then send a set of commands.
>
> If you want to/have to do it on the client, then you have to check that
> everything has returned OK and when they have, do that 'some code' stuff
>
> You need to have some way to indicate that each call has returned and each
> return checks if everything is ready. If you are waiting for data, just
> check if the data is there, otherwise use flags. E.g.
>
> boolean aReturned = false;
> boolean bReturned = false;
> boolean cReturned = false;
>
> rpcA()
> {
> onSuccess()
> {
> aReturned=true;
> check();
> }
>
> }
>
> rpcB()
> {
> onSuccess()
> {
> bReturned=true;
> check();
> }}
>
> rpcC()
> {
> onSuccess()
> {
> cReturned=true;
> check();
> }
>
> }
>
> check()
> {
> if(aReturned && bReturned && cReturned)
> {
> // Do stuff with a, b and c
> }
>
> }
Perhaps a more event-driven system would work, similar to the JDK
java.util.concurrent.CountdownLatch class. Create a Countdown class
implementing HasValue<Integer>, a CountdownEvent extending
ValueChangeEvent<Integer>, initialize a Countdown named latch
before the three RPC calls, call latch.countdown() from each of
the onSuccess methods, and listen for the count to hit 0 and blastoff.
Respectfully,
Eric Jablow
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