| /* |
| * 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 static org.apache.beam.vendor.guava.v20_0.com.google.common.base.Preconditions.checkArgument; |
| import static org.apache.beam.vendor.guava.v20_0.com.google.common.base.Preconditions.checkNotNull; |
| |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Map; |
| import javax.annotation.Nullable; |
| import org.apache.beam.runners.core.SideInputReader; |
| import org.apache.beam.sdk.transforms.Materializations; |
| import org.apache.beam.sdk.transforms.Materializations.MultimapView; |
| import org.apache.beam.sdk.transforms.ViewFn; |
| import org.apache.beam.sdk.transforms.windowing.BoundedWindow; |
| import org.apache.beam.sdk.values.PCollectionView; |
| import org.apache.beam.sdk.values.TupleTag; |
| import org.apache.beam.sdk.values.WindowingStrategy; |
| import org.apache.flink.api.common.functions.RuntimeContext; |
| |
| /** A {@link SideInputReader} for the Flink Batch Runner. */ |
| public class FlinkSideInputReader implements SideInputReader { |
| /** A {@link MultimapView} which always returns an empty iterable. */ |
| private static final MultimapView EMPTY_MULTMAP_VIEW = o -> Collections.EMPTY_LIST; |
| |
| private final Map<TupleTag<?>, WindowingStrategy<?, ?>> sideInputs; |
| |
| private RuntimeContext runtimeContext; |
| |
| public FlinkSideInputReader( |
| Map<PCollectionView<?>, WindowingStrategy<?, ?>> indexByView, RuntimeContext runtimeContext) { |
| for (PCollectionView<?> view : indexByView.keySet()) { |
| checkArgument( |
| Materializations.MULTIMAP_MATERIALIZATION_URN.equals( |
| view.getViewFn().getMaterialization().getUrn()), |
| "This handler is only capable of dealing with %s materializations " |
| + "but was asked to handle %s for PCollectionView with tag %s.", |
| Materializations.MULTIMAP_MATERIALIZATION_URN, |
| view.getViewFn().getMaterialization().getUrn(), |
| view.getTagInternal().getId()); |
| } |
| sideInputs = new HashMap<>(); |
| for (Map.Entry<PCollectionView<?>, WindowingStrategy<?, ?>> entry : indexByView.entrySet()) { |
| sideInputs.put(entry.getKey().getTagInternal(), entry.getValue()); |
| } |
| this.runtimeContext = runtimeContext; |
| } |
| |
| @Nullable |
| @Override |
| public <T> T get(PCollectionView<T> view, BoundedWindow window) { |
| checkNotNull(view, "View passed to sideInput cannot be null"); |
| TupleTag<?> tag = view.getTagInternal(); |
| checkNotNull(sideInputs.get(tag), "Side input for " + view + " not available."); |
| |
| Map<BoundedWindow, T> sideInputs = |
| runtimeContext.getBroadcastVariableWithInitializer( |
| tag.getId(), new SideInputInitializer<>(view)); |
| T result = sideInputs.get(window); |
| if (result == null) { |
| ViewFn<MultimapView, T> viewFn = (ViewFn<MultimapView, T>) view.getViewFn(); |
| result = viewFn.apply(EMPTY_MULTMAP_VIEW); |
| } |
| return result; |
| } |
| |
| @Override |
| public <T> boolean contains(PCollectionView<T> view) { |
| return sideInputs.containsKey(view.getTagInternal()); |
| } |
| |
| @Override |
| public boolean isEmpty() { |
| return sideInputs.isEmpty(); |
| } |
| } |