void mediate(int subtasks) throws InterruptedException, ExecutionException {
ExecutorService executorService = Executors.newFixedThreadPool(subtasks * 2);
List<Callable<StringPair>> tasks = Lists.newArrayList();
Broker<String> broker = new Broker<String>();
for (int subtask = 0; subtask < subtasks; subtask++) {
tasks.add(new IterationHead(broker, subtask, "value" + subtask));
tasks.add(new IterationTail(broker, subtask));
}
Collections.shuffle(tasks);
int numSuccessfulHandovers = 0;
for (Future<StringPair> future : executorService.invokeAll(tasks)) {
StringPair stringPair = future.get();
if (stringPair != null) {
assertEquals("value" + stringPair.getFirst(), stringPair.getSecond());
numSuccessfulHandovers++;
}
}
assertEquals(subtasks, numSuccessfulHandovers);
}
