| /* |
| * 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.samza.translation; |
| |
| import java.util.Map; |
| import org.apache.beam.runners.core.serialization.Base64Serializer; |
| import org.apache.beam.runners.samza.adapter.BoundedSourceSystem; |
| import org.apache.beam.runners.samza.adapter.UnboundedSourceSystem; |
| import org.apache.beam.runners.samza.runtime.OpMessage; |
| import org.apache.beam.runners.samza.util.SamzaCoders; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.io.BoundedSource; |
| import org.apache.beam.sdk.io.Read; |
| import org.apache.beam.sdk.io.Source; |
| import org.apache.beam.sdk.runners.TransformHierarchy; |
| import org.apache.beam.sdk.transforms.PTransform; |
| import org.apache.beam.sdk.util.WindowedValue; |
| import org.apache.beam.sdk.values.PBegin; |
| import org.apache.beam.sdk.values.PCollection; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.ImmutableMap; |
| import org.apache.samza.operators.KV; |
| import org.apache.samza.serializers.KVSerde; |
| import org.apache.samza.serializers.NoOpSerde; |
| import org.apache.samza.serializers.Serde; |
| import org.apache.samza.system.descriptors.GenericInputDescriptor; |
| import org.apache.samza.system.descriptors.GenericSystemDescriptor; |
| |
| /** |
| * Translates {@link org.apache.beam.sdk.io.Read} to Samza input {@link |
| * org.apache.samza.operators.MessageStream}. |
| */ |
| public class ReadTranslator<T> implements TransformTranslator<PTransform<PBegin, PCollection<T>>> { |
| |
| @Override |
| public void translate( |
| PTransform<PBegin, PCollection<T>> transform, |
| TransformHierarchy.Node node, |
| TranslationContext ctx) { |
| final PCollection<T> output = ctx.getOutput(transform); |
| final Coder<WindowedValue<T>> coder = SamzaCoders.of(output); |
| final Source<?> source = |
| transform instanceof Read.Unbounded |
| ? ((Read.Unbounded) transform).getSource() |
| : ((Read.Bounded) transform).getSource(); |
| final String id = ctx.getIdForPValue(output); |
| |
| // Create system descriptor |
| final GenericSystemDescriptor systemDescriptor; |
| if (source instanceof BoundedSource) { |
| systemDescriptor = |
| new GenericSystemDescriptor(id, BoundedSourceSystem.Factory.class.getName()); |
| } else { |
| systemDescriptor = |
| new GenericSystemDescriptor(id, UnboundedSourceSystem.Factory.class.getName()); |
| } |
| |
| final Map<String, String> systemConfig = |
| ImmutableMap.of( |
| "source", Base64Serializer.serializeUnchecked(source), |
| "coder", Base64Serializer.serializeUnchecked(coder), |
| "stepName", node.getFullName()); |
| systemDescriptor.withSystemConfigs(systemConfig); |
| |
| // Create stream descriptor |
| @SuppressWarnings("unchecked") |
| final Serde<KV<?, OpMessage<T>>> kvSerde = |
| (Serde) KVSerde.of(new NoOpSerde<>(), new NoOpSerde<>()); |
| final GenericInputDescriptor<KV<?, OpMessage<T>>> inputDescriptor = |
| systemDescriptor.getInputDescriptor(id, kvSerde); |
| if (source instanceof BoundedSource) { |
| inputDescriptor.isBounded(); |
| } |
| |
| ctx.registerInputMessageStream(output, inputDescriptor); |
| } |
| } |