Examples with OnTimer org.apache.beam.sdk.transforms.DoFn.OnTimer used on opensource projects

Example 11 with OnTimer

use of org.apache.beam.sdk.transforms.DoFn.OnTimer in project beam by apache.

the class ParDoTest method testEventTimeTimerAbsolute.

/**
   * Tests that an event time timer set absolutely for the last possible moment fires and results in
   * supplementary output. The test is otherwise identical to {@link #testEventTimeTimerBounded()}.
   */
@Test
@Category({ ValidatesRunner.class, UsesTimersInParDo.class })
public void testEventTimeTimerAbsolute() throws Exception {
    final String timerId = "foo";
    DoFn<KV<String, Integer>, Integer> fn = new DoFn<KV<String, Integer>, Integer>() {

        @TimerId(timerId)
        private final TimerSpec spec = TimerSpecs.timer(TimeDomain.EVENT_TIME);

        @ProcessElement
        public void processElement(ProcessContext context, @TimerId(timerId) Timer timer, BoundedWindow window) {
            timer.set(window.maxTimestamp());
            context.output(3);
        }

        @OnTimer(timerId)
        public void onTimer(OnTimerContext context) {
            context.output(42);
        }
    };
    PCollection<Integer> output = pipeline.apply(Create.of(KV.of("hello", 37))).apply(ParDo.of(fn));
    PAssert.that(output).containsInAnyOrder(3, 42);
    pipeline.run();
}