| /* |
| * 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.spark.operators; |
| |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Optional; |
| import org.apache.commons.lang3.Validate; |
| import org.apache.wayang.core.api.Configuration; |
| import org.apache.wayang.core.optimizer.OptimizationContext; |
| import org.apache.wayang.core.optimizer.cardinality.CardinalityEstimator; |
| import org.apache.wayang.core.optimizer.cardinality.DefaultCardinalityEstimator; |
| import org.apache.wayang.core.plan.wayangplan.ExecutionOperator; |
| import org.apache.wayang.core.plan.wayangplan.UnaryToUnaryOperator; |
| 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.platform.JavaPlatform; |
| import org.apache.wayang.spark.channels.RddChannel; |
| import org.apache.wayang.spark.execution.SparkExecutor; |
| |
| /** |
| * Converts a {@link RddChannel} into a {@link CollectionChannel} of the {@link JavaPlatform}. |
| */ |
| public class SparkCollectOperator<Type> |
| extends UnaryToUnaryOperator<Type, Type> |
| implements SparkExecutionOperator { |
| |
| public SparkCollectOperator(DataSetType<Type> type) { |
| super(type, type, false); |
| } |
| |
| @Override |
| public Tuple<Collection<ExecutionLineageNode>, Collection<ChannelInstance>> evaluate( |
| ChannelInstance[] inputs, |
| ChannelInstance[] outputs, |
| SparkExecutor sparkExecutor, |
| OptimizationContext.OperatorContext operatorContext) { |
| RddChannel.Instance input = (RddChannel.Instance) inputs[0]; |
| CollectionChannel.Instance output = (CollectionChannel.Instance) outputs[0]; |
| |
| @SuppressWarnings("unchecked") |
| final List<Type> collectedRdd = (List<Type>) input.provideRdd().collect(); |
| output.accept(collectedRdd); |
| |
| return ExecutionOperator.modelEagerExecution(inputs, outputs, operatorContext); |
| } |
| |
| @Override |
| public List<ChannelDescriptor> getSupportedInputChannels(int index) { |
| return Arrays.asList(RddChannel.UNCACHED_DESCRIPTOR, RddChannel.CACHED_DESCRIPTOR); |
| } |
| |
| @Override |
| public List<ChannelDescriptor> getSupportedOutputChannels(int index) { |
| return Collections.singletonList(CollectionChannel.DESCRIPTOR); |
| } |
| |
| @Override |
| public boolean containsAction() { |
| return true; |
| } |
| |
| @Override |
| public Optional<CardinalityEstimator> createCardinalityEstimator( |
| final int outputIndex, |
| final Configuration configuration) { |
| Validate.inclusiveBetween(0, 0, outputIndex); |
| return Optional.of(new DefaultCardinalityEstimator(1d, 1, this.isSupportingBroadcastInputs(), |
| inputCards -> inputCards[0])); |
| } |
| |
| @Override |
| public String getLoadProfileEstimatorConfigurationKey() { |
| return "wayang.spark.collect.load"; |
| } |
| |
| } |