On 08/12/2010 12:50 PM, Kevin Qiu wrote:
> After some thought, I don't think putting it in IncrementalCommand and
> execute with DeferredCommand help much here. Jeff, If I understand you
> correctly, my execute method will look like this:
>
> class Executor {
> // declaration of list of commands
> void execute() {
> DeferredCommand.addCommand(new IncrementalCommand() {
> boolean executing;
> int currentIdx;
>
> public boolean execute() {
> if (executing) return true; // executor will keep looping
> // it's my turn now
> executing = true;
> AsyncCommand cmd = commands.get(currentIdx);
> cmd.execute(new AsyncCallback() {
> public void onFailure(Throwable e) { onSuccess(null); }
> public void onSuccess(Object o) {
> executing = false;
> ++currentIdx;
> }
> }
> // return point
> }
> }
>
> The above method is actually still non-blocking. There's no guarantee
> that my incremental command will finish executing before I reach
> //return point. Did I miss anything?
Looking at your code a bit more closely (and while composing an
example), I see that you want something that requires a bit more structure.
You have the IncrementalCommand() correctly implemented. Forget my
previous answer.
Now that I really understand what you're asking (I think)...
I solve the problem using a state machine. Notice how the SM loops on
DICTIONARYREAD until the command queue is empty.
DeferredCommand.addCommand(new IncrementalCommand() {
@Override
public boolean execute() {
switch (startupState) {
case INITIAL:
timer.scheduleRepeating(600);
startupState = StartupState.DICTIONARYREAD;
break;
case DICTIONARYREAD:
if (dictionaryRequest.getDictionaryPages()) {
break;
}
startupState = StartupState.FINAL;
break;
case FINAL: // Kevin's RETURN POINT?
timer.cancel();
return false; // command is complete
}
return true;
});
public boolean getDictionaryPages() {
while (dictionaryRequestList.size() > 0) {
if (busy) {
return true;
}
dictionaryRequestList.pop().execute(); // RPC and BUSY mutex
}
return false;
}
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