/**
* Listen to events that happen only on local node.
*
* @throws IgniteException If failed.
*/
private static void localListen() throws IgniteException {
System.out.println();
System.out.println(">>> Local event listener example.");
Ignite ignite = Ignition.ignite();
IgnitePredicate<TaskEvent> lsnr =
evt -> {
System.out.println(
"Received task event [evt=" + evt.name() + ", taskName=" + evt.taskName() + ']');
return true; // Return true to continue listening.
};
// Register event listener for all local task execution events.
ignite.events().localListen(lsnr, EVTS_TASK_EXECUTION);
// Generate task events.
ignite
.compute()
.withName("example-event-task")
.run(() -> System.out.println("Executing sample job."));
// Unsubscribe local task event listener.
ignite.events().stopLocalListen(lsnr);
}
/** @throws Exception If failed. */
public void testInternalTaskMetrics() throws Exception {
Ignite ignite = grid();
// Visor task is internal and should not affect metrics.
ignite.compute().withName("visor-test-task").execute(new TestInternalTask(), "testArg");
// Let metrics update twice.
final CountDownLatch latch = new CountDownLatch(2);
ignite
.events()
.localListen(
new IgnitePredicate<Event>() {
@Override
public boolean apply(Event evt) {
assert evt.type() == EVT_NODE_METRICS_UPDATED;
latch.countDown();
return true;
}
},
EVT_NODE_METRICS_UPDATED);
// Wait for metrics update.
latch.await();
ClusterMetrics metrics = ignite.cluster().localNode().metrics();
info("Node metrics: " + metrics);
assert metrics.getAverageActiveJobs() == 0;
assert metrics.getAverageCancelledJobs() == 0;
assert metrics.getAverageJobExecuteTime() == 0;
assert metrics.getAverageJobWaitTime() == 0;
assert metrics.getAverageRejectedJobs() == 0;
assert metrics.getAverageWaitingJobs() == 0;
assert metrics.getCurrentActiveJobs() == 0;
assert metrics.getCurrentCancelledJobs() == 0;
assert metrics.getCurrentJobExecuteTime() == 0;
assert metrics.getCurrentJobWaitTime() == 0;
assert metrics.getCurrentWaitingJobs() == 0;
assert metrics.getMaximumActiveJobs() == 0;
assert metrics.getMaximumCancelledJobs() == 0;
assert metrics.getMaximumJobExecuteTime() == 0;
assert metrics.getMaximumJobWaitTime() == 0;
assert metrics.getMaximumRejectedJobs() == 0;
assert metrics.getMaximumWaitingJobs() == 0;
assert metrics.getTotalCancelledJobs() == 0;
assert metrics.getTotalExecutedJobs() == 0;
assert metrics.getTotalRejectedJobs() == 0;
assert metrics.getTotalExecutedTasks() == 0;
assertTrue(
"MaximumJobExecuteTime="
+ metrics.getMaximumJobExecuteTime()
+ " is less than AverageJobExecuteTime="
+ metrics.getAverageJobExecuteTime(),
metrics.getMaximumJobExecuteTime() >= metrics.getAverageJobExecuteTime());
}
/**
* Listen to events coming from all cluster nodes.
*
* @throws IgniteException If failed.
*/
private static void remoteListen() throws IgniteException {
System.out.println();
System.out.println(">>> Remote event listener example.");
// This optional local callback is called for each event notification
// that passed remote predicate listener.
IgniteBiPredicate<UUID, TaskEvent> locLsnr =
(nodeId, evt) -> {
// Remote filter only accepts tasks whose name being with "good-task" prefix.
assert evt.taskName().startsWith("good-task");
System.out.println(
"Received task event [evt=" + evt.name() + ", taskName=" + evt.taskName());
return true; // Return true to continue listening.
};
// Remote filter which only accepts tasks whose name begins with "good-task" prefix.
IgnitePredicate<TaskEvent> rmtLsnr = evt -> evt.taskName().startsWith("good-task");
Ignite ignite = Ignition.ignite();
// Register event listeners on all nodes to listen for task events.
ignite.events().remoteListen(locLsnr, rmtLsnr, EVTS_TASK_EXECUTION);
// Generate task events.
for (int i = 0; i < 10; i++) {
ignite
.compute()
.withName(i < 5 ? "good-task-" + i : "bad-task-" + i)
.run(
new IgniteRunnable() {
// Auto-inject task session.
@TaskSessionResource private ComputeTaskSession ses;
@Override
public void run() {
System.out.println("Executing sample job for task: " + ses.getTaskName());
}
});
}
}