asynchronous - Java play framework Async operation on same object -
i'm trying perform async operations on same object example pass list promise perform concurrently 3 queries each query when finishes adds queried results list , http result returns full list when concurrent queries results finish.
having @ tutorial:
https://www.playframework.com/documentation/2.2.x/javaasync
i make
return async( promise(new function0<integer>() { public integer apply() { firstquery(); } }) . promise(new function0<integer>() { public integer apply() { return secondquery(); } }) .map(new function<integer,result>() { public result apply(integer i) { logger.debug("we have got "+i); return ok("got " + i); } }) ); to make 2 operations work concurrently , neither pass object promise , neither can result of both queries handle both results.
you can use promise.sequence achieve that
f.promise<integer> one, two; 1 = f.promise.promise(new f.function0<integer>() { @override public integer apply() throws throwable { return 20; } }); 2 = f.promise.promise(new f.function0<integer>() { @override public integer apply() throws throwable { return 22; } }); return f.promise.sequence(one, two).map(new f.function<list<integer>, result>() { @override public result apply(list<integer> integers) throws throwable { int res = integers.get(0) + integers.get(1); return ok("the answer " + res); } });
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