Java PaneInfo.createPane方法代碼示例

import org.apache.beam.sdk.transforms.windowing.PaneInfo; //導入方法依賴的package包/類
@Test
public void testExplodeWindowsManyWindowsMultipleWindowedValues() {
  Instant now = Instant.now();
  BoundedWindow centerWindow = new IntervalWindow(now.minus(1000L), now.plus(1000L));
  BoundedWindow pastWindow = new IntervalWindow(now.minus(1500L), now.plus(500L));
  BoundedWindow futureWindow = new IntervalWindow(now.minus(500L), now.plus(1500L));
  BoundedWindow futureFutureWindow = new IntervalWindow(now, now.plus(2000L));
  PaneInfo pane = PaneInfo.createPane(false, false, Timing.ON_TIME, 3L, 0L);
  WindowedValue<String> value =
      WindowedValue.of(
          "foo",
          now,
          ImmutableList.of(pastWindow, centerWindow, futureWindow, futureFutureWindow),
          pane);

  assertThat(
      value.explodeWindows(),
      containsInAnyOrder(
          WindowedValue.of("foo", now, futureFutureWindow, pane),
          WindowedValue.of("foo", now, futureWindow, pane),
          WindowedValue.of("foo", now, centerWindow, pane),
          WindowedValue.of("foo", now, pastWindow, pane)));
}
 

import org.apache.beam.sdk.transforms.windowing.PaneInfo; //導入方法依賴的package包/類
private <W> PaneInfo describePane(
    Object key, Instant windowMaxTimestamp, PaneInfo previousPane, boolean isFinal) {
  boolean isFirst = previousPane == null;
  Timing previousTiming = isFirst ? null : previousPane.getTiming();
  long index = isFirst ? 0 : previousPane.getIndex() + 1;
  long nonSpeculativeIndex = isFirst ? 0 : previousPane.getNonSpeculativeIndex() + 1;
  Instant outputWM = timerInternals.currentOutputWatermarkTime();
  Instant inputWM = timerInternals.currentInputWatermarkTime();

  // True if it is not possible to assign the element representing this pane a timestamp
  // which will make an ON_TIME pane for any following computation.
  // Ie true if the element's latest possible timestamp is before the current output watermark.
  boolean isLateForOutput = outputWM != null && windowMaxTimestamp.isBefore(outputWM);

  // True if all emitted panes (if any) were EARLY panes.
  // Once the ON_TIME pane has fired, all following panes must be considered LATE even
  // if the output watermark is behind the end of the window.
  boolean onlyEarlyPanesSoFar = previousTiming == null || previousTiming == Timing.EARLY;

  // True is the input watermark hasn't passed the window's max timestamp.
  boolean isEarlyForInput = !inputWM.isAfter(windowMaxTimestamp);

  Timing timing;
  if (isLateForOutput || !onlyEarlyPanesSoFar) {
    // The output watermark has already passed the end of this window, or we have already
    // emitted a non-EARLY pane. Irrespective of how this pane was triggered we must
    // consider this pane LATE.
    timing = Timing.LATE;
  } else if (isEarlyForInput) {
    // This is an EARLY firing.
    timing = Timing.EARLY;
    nonSpeculativeIndex = -1;
  } else {
    // This is the unique ON_TIME firing for the window.
    timing = Timing.ON_TIME;
  }

  WindowTracing.debug(
      "describePane: {} pane (prev was {}) for key:{}; windowMaxTimestamp:{}; "
      + "inputWatermark:{}; outputWatermark:{}; isLateForOutput:{}",
      timing, previousTiming, key, windowMaxTimestamp, inputWM, outputWM, isLateForOutput);

  if (previousPane != null) {
    // Timing transitions should follow EARLY* ON_TIME? LATE*
    switch (previousTiming) {
      case EARLY:
        checkState(
            timing == Timing.EARLY || timing == Timing.ON_TIME || timing == Timing.LATE,
            "EARLY cannot transition to %s", timing);
        break;
      case ON_TIME:
        checkState(
            timing == Timing.LATE, "ON_TIME cannot transition to %s", timing);
        break;
      case LATE:
        checkState(timing == Timing.LATE, "LATE cannot transtion to %s", timing);
        break;
      case UNKNOWN:
        break;
    }
    checkState(!previousPane.isLast(), "Last pane was not last after all.");
  }

  return PaneInfo.createPane(isFirst, isFinal, timing, index, nonSpeculativeIndex);
}