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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.
/*
* 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.annotations.Experimental;
import com.google.cloud.dataflow.sdk.annotations.Experimental.Kind;
import com.google.cloud.dataflow.sdk.coders.Coder;
import com.google.cloud.dataflow.sdk.transforms.display.DisplayData;
import org.joda.time.Duration;
import java.util.Arrays;
import java.util.Collection;
import java.util.Objects;
/**
* A {@link WindowFn} windowing values into sessions separated by {@link #gapDuration}-long
* periods with no elements.
*
* For example, in order to window data into session with at least 10 minute
* gaps in between them:
*
{@code
* PCollection pc = ...;
* PCollection windowed_pc = pc.apply(
* Window.into(Sessions.withGapDuration(Duration.standardMinutes(10))));
* }
*/
public class Sessions extends WindowFn