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SomeSampleWindow.java
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SomeSampleWindow.java
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/*
* Copyright 2020 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package com.google.cloud.pso.windows;
import com.google.cloud.pso.data.MyDummyEvent;
import org.apache.beam.sdk.transforms.PTransform;
import org.apache.beam.sdk.transforms.windowing.AfterEach;
import org.apache.beam.sdk.transforms.windowing.AfterPane;
import org.apache.beam.sdk.transforms.windowing.AfterProcessingTime;
import org.apache.beam.sdk.transforms.windowing.AfterWatermark;
import org.apache.beam.sdk.transforms.windowing.FixedWindows;
import org.apache.beam.sdk.transforms.windowing.Repeatedly;
import org.apache.beam.sdk.transforms.windowing.Sessions;
import org.apache.beam.sdk.transforms.windowing.Window;
import org.apache.beam.sdk.values.KV;
import org.apache.beam.sdk.values.PCollection;
import org.joda.time.Duration;
public class SomeSampleWindow
extends PTransform<
PCollection<KV<String, MyDummyEvent>>, PCollection<KV<String, MyDummyEvent>>> {
private Window<KV<String, MyDummyEvent>> windowToApply;
public SomeSampleWindow(WindowType windowType) {
switch (windowType) {
case SESSION_WINDOW_WATERMARK:
windowToApply = sessionWindowWatermark();
break;
case SESSION_WINDOW_AFTER_EACH_IN_ORDER:
windowToApply = sessionWindowAfterEach();
break;
case FIXED_WINDOW_DROP:
windowToApply = fixedWindowDropLateData();
break;
case FIXED_WINDOW_NO_DROP:
default:
windowToApply = fixedWindow();
}
}
@Override
public PCollection<KV<String, MyDummyEvent>> expand(PCollection<KV<String, MyDummyEvent>> input) {
PCollection<KV<String, MyDummyEvent>> output = input.apply(windowToApply);
return output;
}
/** A fixed window with no dropped late data */
public Window<KV<String, MyDummyEvent>> fixedWindow() {
Window<KV<String, MyDummyEvent>> window =
Window.<KV<String, MyDummyEvent>>into(FixedWindows.of(Duration.standardSeconds(100)))
.triggering(
AfterWatermark.pastEndOfWindow()
.withEarlyFirings(
AfterProcessingTime.pastFirstElementInPane()
.plusDelayOf(Duration.standardSeconds(5)))
.withLateFirings(AfterProcessingTime.pastFirstElementInPane()))
.withAllowedLateness(Duration.standardDays(10))
.accumulatingFiredPanes();
return window;
}
/** A fixed window dropping late data */
public Window<KV<String, MyDummyEvent>> fixedWindowDropLateData() {
Window<KV<String, MyDummyEvent>> window =
Window.<KV<String, MyDummyEvent>>into(FixedWindows.of(Duration.standardSeconds(10)))
.triggering(
AfterWatermark.pastEndOfWindow()
.withEarlyFirings(
AfterProcessingTime.pastFirstElementInPane()
.plusDelayOf(Duration.standardSeconds(5)))
.withLateFirings(AfterProcessingTime.pastFirstElementInPane()))
.withAllowedLateness(Duration.standardSeconds(0))
.accumulatingFiredPanes();
return window;
}
/** A session window with firing based on AfterEach.inOrder */
public Window<KV<String, MyDummyEvent>> sessionWindowAfterEach() {
Window<KV<String, MyDummyEvent>> window =
Window.<KV<String, MyDummyEvent>>into(Sessions.withGapDuration(Duration.standardSeconds(5)))
.triggering(
AfterEach.inOrder(
AfterPane.elementCountAtLeast(3),
AfterPane.elementCountAtLeast(10),
Repeatedly.forever(AfterPane.elementCountAtLeast(15))
))
.withAllowedLateness(Duration.standardDays(10))
.accumulatingFiredPanes();
return window;
}
/** A session window with firing based on watermark */
private Window<KV<String, MyDummyEvent>> sessionWindowWatermark() {
Window<KV<String, MyDummyEvent>> window =
Window.<KV<String, MyDummyEvent>>into(Sessions.withGapDuration(Duration.standardSeconds(5)))
.triggering(
AfterWatermark.pastEndOfWindow()
.withEarlyFirings(
AfterProcessingTime.pastFirstElementInPane()
.plusDelayOf(Duration.standardSeconds(8)))
.withLateFirings(AfterProcessingTime.pastFirstElementInPane()))
.withAllowedLateness(Duration.standardDays(10))
.accumulatingFiredPanes();
return window;
}
public enum WindowType {
FIXED_WINDOW_NO_DROP,
FIXED_WINDOW_DROP,
SESSION_WINDOW_AFTER_EACH_IN_ORDER,
SESSION_WINDOW_WATERMARK
}
}