| /* |
| * 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.wayang.java.operators; |
| |
| import org.apache.wayang.basic.operators.FlatMapOperator; |
| import org.apache.wayang.core.api.Configuration; |
| import org.apache.wayang.core.function.FlatMapDescriptor; |
| import org.apache.wayang.core.optimizer.OptimizationContext; |
| import org.apache.wayang.core.optimizer.costs.LoadProfileEstimator; |
| import org.apache.wayang.core.optimizer.costs.LoadProfileEstimators; |
| import org.apache.wayang.core.plan.wayangplan.ExecutionOperator; |
| import org.apache.wayang.core.platform.ChannelDescriptor; |
| import org.apache.wayang.core.platform.ChannelInstance; |
| import org.apache.wayang.core.platform.lineage.ExecutionLineageNode; |
| import org.apache.wayang.core.types.DataSetType; |
| import org.apache.wayang.core.util.Tuple; |
| import org.apache.wayang.java.channels.CollectionChannel; |
| import org.apache.wayang.java.channels.JavaChannelInstance; |
| import org.apache.wayang.java.channels.StreamChannel; |
| import org.apache.wayang.java.execution.JavaExecutor; |
| |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Optional; |
| import java.util.Spliterator; |
| import java.util.Spliterators; |
| import java.util.function.Function; |
| import java.util.stream.StreamSupport; |
| |
| /** |
| * Java implementation of the {@link FlatMapOperator}. |
| */ |
| public class JavaFlatMapOperator<InputType, OutputType> |
| extends FlatMapOperator<InputType, OutputType> |
| implements JavaExecutionOperator { |
| |
| /** |
| * Creates a new instance. |
| * |
| * @param functionDescriptor |
| */ |
| public JavaFlatMapOperator(DataSetType<InputType> inputType, DataSetType<OutputType> outputType, |
| FlatMapDescriptor<InputType, OutputType> functionDescriptor) { |
| super(functionDescriptor, inputType, outputType); |
| } |
| |
| /** |
| * Copies an instance (exclusive of broadcasts). |
| * |
| * @param that that should be copied |
| */ |
| public JavaFlatMapOperator(FlatMapOperator<InputType, OutputType> that) { |
| super(that); |
| } |
| |
| @Override |
| public Tuple<Collection<ExecutionLineageNode>, Collection<ChannelInstance>> evaluate( |
| ChannelInstance[] inputs, |
| ChannelInstance[] outputs, |
| JavaExecutor javaExecutor, |
| OptimizationContext.OperatorContext operatorContext) { |
| assert inputs.length == this.getNumInputs(); |
| assert outputs.length == this.getNumOutputs(); |
| |
| final Function<InputType, Iterable<OutputType>> flatmapFunction = |
| javaExecutor.getCompiler().compile(this.functionDescriptor); |
| JavaExecutor.openFunction(this, flatmapFunction, inputs, operatorContext); |
| |
| ((StreamChannel.Instance) outputs[0]).accept( |
| ((JavaChannelInstance) inputs[0]).<InputType>provideStream().flatMap(dataQuantum -> |
| StreamSupport.stream( |
| Spliterators.spliteratorUnknownSize( |
| flatmapFunction.apply(dataQuantum).iterator(), |
| Spliterator.ORDERED), |
| false |
| ) |
| ) |
| ); |
| |
| return ExecutionOperator.modelLazyExecution(inputs, outputs, operatorContext); |
| } |
| |
| @Override |
| protected ExecutionOperator createCopy() { |
| return new JavaFlatMapOperator<>(this.getInputType(), this.getOutputType(), this.getFunctionDescriptor()); |
| } |
| |
| |
| @Override |
| public String getLoadProfileEstimatorConfigurationKey() { |
| return "wayang.java.flatmap.load"; |
| } |
| |
| @Override |
| public Optional<LoadProfileEstimator> createLoadProfileEstimator(Configuration configuration) { |
| final Optional<LoadProfileEstimator> optEstimator = |
| JavaExecutionOperator.super.createLoadProfileEstimator(configuration); |
| LoadProfileEstimators.nestUdfEstimator(optEstimator, this.functionDescriptor, configuration); |
| return optEstimator; |
| } |
| |
| @Override |
| public List<ChannelDescriptor> getSupportedInputChannels(int index) { |
| assert index <= this.getNumInputs() || (index == 0 && this.getNumInputs() == 0); |
| if (this.getInput(index).isBroadcast()) return Collections.singletonList(CollectionChannel.DESCRIPTOR); |
| return Arrays.asList(CollectionChannel.DESCRIPTOR, StreamChannel.DESCRIPTOR); |
| } |
| |
| @Override |
| public List<ChannelDescriptor> getSupportedOutputChannels(int index) { |
| assert index <= this.getNumOutputs() || (index == 0 && this.getNumOutputs() == 0); |
| return Collections.singletonList(StreamChannel.DESCRIPTOR); |
| } |
| |
| } |