Comments (1)
Hi Tushar,
Sorry for the late response.
If I comment lines 39 to 41 of SumAction.java and uncomment line 44, the results are printed:
@Override
protected void compute() {
if (data.size() <= SEQUENTIAL_THRESHOLD) { // base case
long sum = computeSumDirectly();
System.out.format("Sum of %s: %d\n", data.toString(), sum);
} else { // recursive case
// Calculate new range
int mid = data.size() / 2;
SumAction firstSubtask =
new SumAction(data.subList(0, mid));
SumAction secondSubtask =
new SumAction(data.subList(mid, data.size()));
//firstSubtask.fork(); // queue the first task
//secondSubtask.compute(); // compute the second task
//firstSubtask.join(); // wait for the first task result
// Or simply call
invokeAll(firstSubtask, secondSubtask);
}
}
join
is called inside invokeAll
, so we don't have to call it again. If we were talking about Tasks, yes, for Tasks we have to call join
because this method returns the result of the computation when it is done: https://stackoverflow.com/questions/48634809/why-should-we-call-join-after-invokeall-method
from fork-join-demo.
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from fork-join-demo.