com.google.cloud.dataflow.sdk.transforms.windowing.GlobalWindow Maven / Gradle / Ivy

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Google Cloud Dataflow Java SDK provides a simple, Java-based interface for processing virtually any size data using Google cloud resources. This artifact includes entire Dataflow Java SDK.

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/*
 * Copyright (C) 2015 Google Inc.
 *
 * 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.dataflow.sdk.transforms.windowing;

import com.google.cloud.dataflow.sdk.coders.AtomicCoder;

import org.joda.time.Duration;
import org.joda.time.Instant;

import java.io.InputStream;
import java.io.OutputStream;

/**
 * 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;
  }

  private GlobalWindow() {}

  /**
   * {@link Coder} for encoding and decoding {@code GlobalWindow}s.
   */
  public static class Coder extends AtomicCoder {
    public static final Coder INSTANCE = new Coder();

    @Override
    public void encode(GlobalWindow window, OutputStream outStream, Context context) {}

    @Override
    public GlobalWindow decode(InputStream inStream, Context context) {
      return GlobalWindow.INSTANCE;
    }

    private Coder() {}
  }
}