/**
* Note, this test can only work as long as we have a single thread executor executing the state
* update tasks!
*/
public void testPrioritizedTasks() throws Exception {
BlockingTask block = new BlockingTask(Priority.IMMEDIATE);
clusterService.submitStateUpdateTask("test", block);
int taskCount = randomIntBetween(5, 20);
// will hold all the tasks in the order in which they were executed
List<PrioritizedTask> tasks = new ArrayList<>(taskCount);
CountDownLatch latch = new CountDownLatch(taskCount);
for (int i = 0; i < taskCount; i++) {
Priority priority = randomFrom(Priority.values());
clusterService.submitStateUpdateTask("test", new PrioritizedTask(priority, latch, tasks));
}
block.close();
latch.await();
Priority prevPriority = null;
for (PrioritizedTask task : tasks) {
if (prevPriority == null) {
prevPriority = task.priority();
} else {
assertThat(task.priority().sameOrAfter(prevPriority), is(true));
}
}
}
