| /* |
| * 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 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.Collections; |
| import java.util.List; |
| import org.apache.wayang.basic.channels.FileChannel; |
| import org.apache.wayang.basic.data.Tuple2; |
| import org.apache.wayang.core.api.exception.WayangException; |
| import org.apache.wayang.core.optimizer.OptimizationContext; |
| import org.apache.wayang.core.plan.wayangplan.ExecutionOperator; |
| import org.apache.wayang.core.plan.wayangplan.Operator; |
| import org.apache.wayang.core.plan.wayangplan.UnarySink; |
| 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.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; |
| |
| /** |
| * {@link Operator} for the {@link JavaPlatform} that creates a TSV file. |
| * Only applicable to tuples with standard datatypes. |
| * |
| * @see JavaObjectFileSource |
| */ |
| public class JavaTsvFileSink<T extends Tuple2<?, ?>> extends UnarySink<T> implements JavaExecutionOperator { |
| |
| private final String targetPath; |
| |
| public JavaTsvFileSink(DataSetType<T> type) { |
| this(null, type); |
| } |
| |
| public JavaTsvFileSink(String targetPath, DataSetType<T> type) { |
| super(type); |
| assert type.equals(DataSetType.createDefault(Tuple2.class)) : |
| String.format("Illegal type for %s: %s", this, type); |
| this.targetPath = targetPath; |
| } |
| |
| @Override |
| public Tuple<Collection<ExecutionLineageNode>, Collection<ChannelInstance>> evaluate( |
| ChannelInstance[] inputs, |
| ChannelInstance[] outputs, |
| JavaExecutor javaExecutor, |
| OptimizationContext.OperatorContext operatorContext) { |
| assert inputs.length == this.getNumInputs(); |
| |
| // Prepare Hadoop's SequenceFile.Writer. |
| FileChannel.Instance output = (FileChannel.Instance) outputs[0]; |
| final String path = output.addGivenOrTempPath(this.targetPath, javaExecutor.getCompiler().getConfiguration()); |
| final FileSystem fileSystem = FileSystems.getFileSystem(path).orElseThrow( |
| () -> new IllegalStateException(String.format("No file system found for \"%s\".", this.targetPath)) |
| ); |
| |
| try (final BufferedWriter writer = new BufferedWriter( |
| new OutputStreamWriter( |
| fileSystem.create(path), "UTF-8" |
| ) |
| )) { |
| try { |
| ((JavaChannelInstance) inputs[0]).provideStream().forEach( |
| dataQuantum -> { |
| try { |
| // TODO: Once there are more tuple types, make this generic. |
| @SuppressWarnings("unchecked") |
| Tuple2<Object, Object> tuple2 = (Tuple2<Object, Object>) dataQuantum; |
| writer.append(String.valueOf(tuple2.field0)) |
| .append('\t') |
| .append(String.valueOf(tuple2.field1)) |
| .append('\n'); |
| } catch (IOException e) { |
| throw new UncheckedIOException(e); |
| } |
| } |
| ); |
| } catch (UncheckedIOException e) { |
| throw e.getCause(); |
| } |
| } catch (IOException e) { |
| throw new WayangException(String.format("%s failed on writing to %s.", this, this.targetPath), e); |
| } |
| |
| return ExecutionOperator.modelEagerExecution(inputs, outputs, operatorContext); |
| } |
| |
| @Override |
| public String getLoadProfileEstimatorConfigurationKey() { |
| return "wayang.java.tsvfilesink.load"; |
| } |
| |
| @Override |
| protected ExecutionOperator createCopy() { |
| return new JavaTsvFileSink<>(this.targetPath, this.getType()); |
| } |
| |
| @Override |
| public List<ChannelDescriptor> getSupportedInputChannels(int index) { |
| assert index <= this.getNumInputs() || (index == 0 && this.getNumInputs() == 0); |
| return Arrays.asList(CollectionChannel.DESCRIPTOR, StreamChannel.DESCRIPTOR); |
| } |
| |
| @Override |
| public List<ChannelDescriptor> getSupportedOutputChannels(int index) { |
| assert index <= this.getNumInputs() || (index == 0 && this.getNumInputs() == 0); |
| return Collections.singletonList(FileChannel.HDFS_TSV_DESCRIPTOR); |
| } |
| |
| } |