| /* |
| * 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.jet.processors; |
| |
| import com.hazelcast.jet.Traverser; |
| import com.hazelcast.jet.Traversers; |
| import com.hazelcast.jet.core.AbstractProcessor; |
| import com.hazelcast.jet.core.Processor; |
| import com.hazelcast.jet.function.SupplierEx; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import javax.annotation.Nonnull; |
| import org.apache.beam.runners.jet.Utils; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.transforms.windowing.BoundedWindow; |
| import org.apache.beam.sdk.transforms.windowing.PaneInfo; |
| import org.apache.beam.sdk.transforms.windowing.TimestampCombiner; |
| import org.apache.beam.sdk.util.WindowedValue; |
| import org.apache.beam.sdk.values.WindowingStrategy; |
| import org.joda.time.Instant; |
| |
| /** |
| * Jet {@link com.hazelcast.jet.core.Processor} implementation for Beam's side input producing |
| * primitives. Collects all input {@link WindowedValue}s, groups them by windows and keys and when |
| * input is complete emits them. |
| */ |
| public class ViewP extends AbstractProcessor { |
| |
| private final TimestampCombiner timestampCombiner; |
| private final Coder inputCoder; |
| private final Coder outputCoder; |
| |
| @SuppressWarnings({"FieldCanBeLocal", "unused"}) |
| private final String ownerId; // do not remove, useful for debugging |
| |
| private Map<BoundedWindow, TimestampAndValues> values = new HashMap<>(); |
| private Traverser<byte[]> resultTraverser; |
| |
| private ViewP( |
| Coder inputCoder, Coder outputCoder, WindowingStrategy windowingStrategy, String ownerId) { |
| this.timestampCombiner = windowingStrategy.getTimestampCombiner(); |
| this.inputCoder = inputCoder; |
| this.outputCoder = |
| Utils.deriveIterableValueCoder((WindowedValue.FullWindowedValueCoder) outputCoder); |
| this.ownerId = ownerId; |
| } |
| |
| @Override |
| protected boolean tryProcess(int ordinal, @Nonnull Object item) { |
| WindowedValue<?> windowedValue = Utils.decodeWindowedValue((byte[]) item, inputCoder); |
| for (BoundedWindow window : windowedValue.getWindows()) { |
| values.merge( |
| window, |
| new TimestampAndValues( |
| windowedValue.getPane(), windowedValue.getTimestamp(), windowedValue.getValue()), |
| (o, n) -> o.merge(timestampCombiner, n)); |
| } |
| |
| return true; |
| } |
| |
| @Override |
| public boolean complete() { |
| if (resultTraverser == null) { |
| resultTraverser = |
| Traversers.traverseStream( |
| values.entrySet().stream() |
| .map( |
| e -> { |
| WindowedValue<?> outputValue = |
| WindowedValue.of( |
| e.getValue().values, |
| e.getValue().timestamp, |
| Collections.singleton(e.getKey()), |
| e.getValue().pane); |
| return Utils.encodeWindowedValue(outputValue, outputCoder); |
| })); |
| } |
| return emitFromTraverser(resultTraverser); |
| } |
| |
| public static SupplierEx<Processor> supplier( |
| Coder inputCoder, |
| Coder outputCoder, |
| WindowingStrategy<?, ?> windowingStrategy, |
| String ownerId) { |
| return () -> new ViewP(inputCoder, outputCoder, windowingStrategy, ownerId); |
| } |
| |
| private static class TimestampAndValues { |
| private final List<Object> values = new ArrayList<>(); |
| private Instant timestamp; |
| private PaneInfo pane; |
| |
| TimestampAndValues(PaneInfo pane, Instant timestamp, Object value) { |
| this.pane = pane; |
| this.timestamp = timestamp; |
| this.values.add(value); |
| } |
| |
| public Iterable<Object> getValues() { |
| return values; |
| } |
| |
| TimestampAndValues merge(TimestampCombiner timestampCombiner, TimestampAndValues other) { |
| pane = other.pane; |
| timestamp = timestampCombiner.combine(timestamp, other.timestamp); |
| values.addAll(other.values); |
| return this; |
| } |
| } |
| } |