/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.beam.sdk.transforms.windowing;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Collections;
import java.util.List;
import org.apache.beam.sdk.coders.StructuredCoder;
import org.joda.time.Duration;
import org.joda.time.Instant;
/**
* The default window into which all data is placed (via {@link GlobalWindows}).
*/
public class GlobalWindow extends BoundedWindow {
/**
* Singleton instance of {@link GlobalWindow}.
*/
public static final GlobalWindow INSTANCE = new GlobalWindow();
// Triggers use maxTimestamp to set timers' timestamp. Timers fires when
// the watermark passes their timestamps. So, the maxTimestamp needs to be
// smaller than the TIMESTAMP_MAX_VALUE.
// One standard day is subtracted from TIMESTAMP_MAX_VALUE to make sure
// the maxTimestamp is smaller than TIMESTAMP_MAX_VALUE even after rounding up
// to seconds or minutes.
private static final Instant END_OF_GLOBAL_WINDOW =
TIMESTAMP_MAX_VALUE.minus(Duration.standardDays(1));
@Override
public Instant maxTimestamp() {
return END_OF_GLOBAL_WINDOW;
}
@Override
public boolean equals(Object other) {
return other instanceof GlobalWindow;
}
@Override
public int hashCode() {
return GlobalWindow.class.hashCode();
}
private GlobalWindow() {}
/**
* {@link Coder} for encoding and decoding {@code GlobalWindow}s.
*/
public static class Coder extends StructuredCoder<GlobalWindow> {
public static final Coder INSTANCE = new Coder();
@Override
public void encode(GlobalWindow window, OutputStream outStream) {}
@Override
public GlobalWindow decode(InputStream inStream) {
return GlobalWindow.INSTANCE;
}
@Override
public void verifyDeterministic() {}
@Override
public boolean consistentWithEquals() {
return true;
}
@Override
public final List<org.apache.beam.sdk.coders.Coder<?>> getCoderArguments() {
return Collections.emptyList();
}
private Coder() {}
}
}