/*
* 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.runners.flink.translation.functions;
import java.util.Collection;
import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
import org.apache.beam.sdk.transforms.windowing.WindowFn;
import org.apache.beam.sdk.util.WindowedValue;
import org.apache.flink.api.common.functions.FlatMapFunction;
import org.apache.flink.util.Collector;
/**
* Flink {@link FlatMapFunction} for implementing
* {@link org.apache.beam.sdk.transforms.windowing.Window.Assign}.
*/
public class FlinkAssignWindows<T, W extends BoundedWindow>
implements FlatMapFunction<WindowedValue<T>, WindowedValue<T>> {
private final WindowFn<T, W> windowFn;
public FlinkAssignWindows(WindowFn<T, W> windowFn) {
this.windowFn = windowFn;
}
@Override
public void flatMap(
WindowedValue<T> input, Collector<WindowedValue<T>> collector) throws Exception {
Collection<W> windows = windowFn.assignWindows(new FlinkAssignContext<>(windowFn, input));
for (W window: windows) {
collector.collect(
WindowedValue.of(input.getValue(), input.getTimestamp(), window, input.getPane()));
}
}
}