| /* |
| * 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.TextFileSink; |
| import org.apache.wayang.core.api.Configuration; |
| import org.apache.wayang.core.api.exception.WayangException; |
| import org.apache.wayang.core.function.TransformationDescriptor; |
| 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.util.Tuple; |
| import org.apache.wayang.core.util.fs.FileSystem; |
| import org.apache.wayang.core.util.fs.FileSystems; |
| 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 org.apache.wayang.java.platform.JavaPlatform; |
| |
| import java.io.BufferedWriter; |
| import java.io.IOException; |
| import java.io.OutputStreamWriter; |
| import java.io.UncheckedIOException; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.Optional; |
| import java.util.function.Function; |
| |
| /** |
| * Implementation fo the {@link TextFileSink} for the {@link JavaPlatform}. |
| */ |
| public class JavaTextFileSink<T> extends TextFileSink<T> implements JavaExecutionOperator { |
| |
| public JavaTextFileSink(String textFileUrl, TransformationDescriptor<T, String> formattingDescriptor) { |
| super(textFileUrl, formattingDescriptor); |
| } |
| |
| public JavaTextFileSink(TextFileSink<T> that) { |
| super(that); |
| } |
| |
| @Override |
| public Tuple<Collection<ExecutionLineageNode>, Collection<ChannelInstance>> evaluate( |
| ChannelInstance[] inputs, |
| ChannelInstance[] outputs, |
| JavaExecutor javaExecutor, |
| OptimizationContext.OperatorContext operatorContext) { |
| assert inputs.length == 1; |
| assert outputs.length == 0; |
| |
| JavaChannelInstance input = (JavaChannelInstance) inputs[0]; |
| final FileSystem fs = FileSystems.requireFileSystem(this.textFileUrl); |
| final Function<T, String> formatter = javaExecutor.getCompiler().compile(this.formattingDescriptor); |
| |
| |
| try (BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(fs.create(this.textFileUrl)))) { |
| input.<T>provideStream().forEach( |
| dataQuantum -> { |
| try { |
| writer.write(formatter.apply(dataQuantum)); |
| writer.write('\n'); |
| } catch (IOException e) { |
| throw new UncheckedIOException(e); |
| } |
| } |
| ); |
| } catch (IOException e) { |
| throw new WayangException("Writing failed.", e); |
| } |
| |
| return ExecutionOperator.modelEagerExecution(inputs, outputs, operatorContext); |
| } |
| |
| |
| @Override |
| public String getLoadProfileEstimatorConfigurationKey() { |
| return "wayang.java.textfilesink.load"; |
| } |
| |
| @Override |
| public Optional<LoadProfileEstimator> createLoadProfileEstimator(Configuration configuration) { |
| final Optional<LoadProfileEstimator> optEstimator = |
| JavaExecutionOperator.super.createLoadProfileEstimator(configuration); |
| LoadProfileEstimators.nestUdfEstimator(optEstimator, this.formattingDescriptor, configuration); |
| return optEstimator; |
| } |
| |
| @Override |
| public List<ChannelDescriptor> getSupportedInputChannels(int index) { |
| return Arrays.asList(CollectionChannel.DESCRIPTOR, StreamChannel.DESCRIPTOR); |
| } |
| |
| @Override |
| public List<ChannelDescriptor> getSupportedOutputChannels(int index) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| } |