/**
* 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());
}
});
}
}
/**
* Grabs local events and detects if events was lost since last poll.
*
* @param ignite Target grid.
* @param evtOrderKey Unique key to take last order key from node local map.
* @param evtThrottleCntrKey Unique key to take throttle count from node local map.
* @param evtTypes Event types to collect.
* @param evtMapper Closure to map grid events to Visor data transfer objects.
* @return Collections of node events
*/
public static Collection<VisorGridEvent> collectEvents(
Ignite ignite,
String evtOrderKey,
String evtThrottleCntrKey,
final int[] evtTypes,
IgniteClosure<Event, VisorGridEvent> evtMapper) {
assert ignite != null;
assert evtTypes != null && evtTypes.length > 0;
ConcurrentMap<String, Long> nl = ignite.cluster().nodeLocalMap();
final long lastOrder = getOrElse(nl, evtOrderKey, -1L);
final long throttle = getOrElse(nl, evtThrottleCntrKey, 0L);
// When we first time arrive onto a node to get its local events,
// we'll grab only last those events that not older than given period to make sure we are
// not grabbing GBs of data accidentally.
final long notOlderThan = System.currentTimeMillis() - EVENTS_COLLECT_TIME_WINDOW;
// Flag for detecting gaps between events.
final AtomicBoolean lastFound = new AtomicBoolean(lastOrder < 0);
IgnitePredicate<Event> p =
new IgnitePredicate<Event>() {
/** */
private static final long serialVersionUID = 0L;
@Override
public boolean apply(Event e) {
// Detects that events were lost.
if (!lastFound.get() && (lastOrder == e.localOrder())) lastFound.set(true);
// Retains events by lastOrder, period and type.
return e.localOrder() > lastOrder
&& e.timestamp() > notOlderThan
&& F.contains(evtTypes, e.type());
}
};
Collection<Event> evts = ignite.events().localQuery(p);
// Update latest order in node local, if not empty.
if (!evts.isEmpty()) {
Event maxEvt = Collections.max(evts, EVTS_ORDER_COMPARATOR);
nl.put(evtOrderKey, maxEvt.localOrder());
}
// Update throttle counter.
if (!lastFound.get())
nl.put(evtThrottleCntrKey, throttle == 0 ? EVENTS_LOST_THROTTLE : throttle - 1);
boolean lost = !lastFound.get() && throttle == 0;
Collection<VisorGridEvent> res = new ArrayList<>(evts.size() + (lost ? 1 : 0));
if (lost) res.add(new VisorGridEventsLost(ignite.cluster().localNode().id()));
for (Event e : evts) {
VisorGridEvent visorEvt = evtMapper.apply(e);
if (visorEvt != null) res.add(visorEvt);
}
return res;
}