| /* |
| * 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.fn.harness.state; |
| |
| import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument; |
| |
| import java.io.IOException; |
| import org.apache.beam.fn.harness.Cache; |
| import org.apache.beam.fn.harness.Caches; |
| import org.apache.beam.model.fnexecution.v1.BeamFnApi.StateKey; |
| import org.apache.beam.model.fnexecution.v1.BeamFnApi.StateRequest; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.transforms.Materializations.MultimapView; |
| import org.apache.beam.sdk.util.ByteStringOutputStream; |
| import org.apache.beam.vendor.grpc.v1p43p2.com.google.protobuf.ByteString; |
| |
| /** |
| * An implementation of a multimap side input that utilizes the Beam Fn State API to fetch values. |
| */ |
| @SuppressWarnings({ |
| "rawtypes", // TODO(https://github.com/apache/beam/issues/20447) |
| "nullness" // TODO(https://github.com/apache/beam/issues/20497) |
| }) |
| public class MultimapSideInput<K, V> implements MultimapView<K, V> { |
| |
| private final Cache<?, ?> cache; |
| private final BeamFnStateClient beamFnStateClient; |
| private final StateRequest keysRequest; |
| private final Coder<K> keyCoder; |
| private final Coder<V> valueCoder; |
| |
| public MultimapSideInput( |
| Cache<?, ?> cache, |
| BeamFnStateClient beamFnStateClient, |
| String instructionId, |
| StateKey stateKey, |
| Coder<K> keyCoder, |
| Coder<V> valueCoder) { |
| checkArgument( |
| stateKey.hasMultimapKeysSideInput(), |
| "Expected MultimapKeysSideInput StateKey but received %s.", |
| stateKey); |
| this.cache = cache; |
| this.beamFnStateClient = beamFnStateClient; |
| this.keysRequest = |
| StateRequest.newBuilder().setInstructionId(instructionId).setStateKey(stateKey).build(); |
| this.keyCoder = keyCoder; |
| this.valueCoder = valueCoder; |
| } |
| |
| @Override |
| public Iterable<K> get() { |
| return StateFetchingIterators.readAllAndDecodeStartingFrom( |
| cache, beamFnStateClient, keysRequest, keyCoder); |
| } |
| |
| @Override |
| public Iterable<V> get(K k) { |
| ByteStringOutputStream output = new ByteStringOutputStream(); |
| try { |
| keyCoder.encode(k, output); |
| } catch (IOException e) { |
| throw new IllegalStateException( |
| String.format( |
| "Failed to encode key %s for side input id %s.", |
| k, keysRequest.getStateKey().getMultimapKeysSideInput().getSideInputId()), |
| e); |
| } |
| ByteString encodedKey = output.toByteString(); |
| StateKey stateKey = |
| StateKey.newBuilder() |
| .setMultimapSideInput( |
| StateKey.MultimapSideInput.newBuilder() |
| .setTransformId( |
| keysRequest.getStateKey().getMultimapKeysSideInput().getTransformId()) |
| .setSideInputId( |
| keysRequest.getStateKey().getMultimapKeysSideInput().getSideInputId()) |
| .setWindow(keysRequest.getStateKey().getMultimapKeysSideInput().getWindow()) |
| .setKey(encodedKey)) |
| .build(); |
| |
| StateRequest request = keysRequest.toBuilder().setStateKey(stateKey).build(); |
| return StateFetchingIterators.readAllAndDecodeStartingFrom( |
| Caches.subCache(cache, "ValuesForKey", encodedKey), beamFnStateClient, request, valueCoder); |
| } |
| } |