| /* |
| * 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.flink.channels; |
| |
| import java.util.OptionalLong; |
| import org.apache.flink.api.java.DataSet; |
| import org.apache.wayang.core.optimizer.OptimizationContext; |
| import org.apache.wayang.core.plan.executionplan.Channel; |
| import org.apache.wayang.core.plan.wayangplan.OutputSlot; |
| import org.apache.wayang.core.platform.AbstractChannelInstance; |
| import org.apache.wayang.core.platform.ChannelDescriptor; |
| import org.apache.wayang.core.platform.ChannelInstance; |
| import org.apache.wayang.core.platform.Executor; |
| import org.apache.wayang.flink.execution.FlinkExecutor; |
| |
| /** |
| * Describes the situation where one {@link DataSet} is operated on, producing a further {@link DataSet}. |
| * <p><i>NB: We might be more specific: Distinguish between cached/uncached and pipelined/aggregated.</i></p> |
| */ |
| public class DataSetChannel extends Channel{ |
| |
| public static final ChannelDescriptor DESCRIPTOR = new ChannelDescriptor( |
| DataSetChannel.class, true, false |
| ); |
| |
| public static final ChannelDescriptor DESCRIPTOR_MANY = new ChannelDescriptor( |
| DataSetChannel.class, true, false |
| ); |
| |
| public DataSetChannel(ChannelDescriptor descriptor, OutputSlot<?> outputSlot) { |
| super(descriptor, outputSlot); |
| assert descriptor == DESCRIPTOR || descriptor == DESCRIPTOR_MANY; |
| // |
| this.markForInstrumentation(); |
| } |
| |
| private DataSetChannel(DataSetChannel parent) { |
| super(parent); |
| } |
| |
| @Override |
| public Channel copy() { |
| return new DataSetChannel(this); |
| } |
| |
| @Override |
| public Instance createInstance(Executor executor, |
| OptimizationContext.OperatorContext producerOperatorContext, |
| int producerOutputIndex) { |
| return new Instance((FlinkExecutor) executor, producerOperatorContext, producerOutputIndex); |
| } |
| |
| |
| |
| /** |
| * {@link ChannelInstance} implementation for {@link DataSet}s. |
| */ |
| public class Instance extends AbstractChannelInstance { |
| |
| private DataSet<?> dataSet; |
| |
| private long size; |
| |
| public Instance(FlinkExecutor executor, |
| OptimizationContext.OperatorContext producerOperatorContext, |
| int producerOutputIndex) { |
| super(executor, producerOperatorContext, producerOutputIndex); |
| } |
| |
| public void accept(DataSet dataSet, FlinkExecutor flinkExecutor) { |
| this.dataSet = dataSet; |
| } |
| |
| |
| @SuppressWarnings("unchecked") |
| public <T> DataSet<T> provideDataSet() { |
| return (DataSet<T>) this.dataSet; |
| } |
| |
| @Override |
| protected void doDispose() { |
| this.dataSet = null; |
| } |
| |
| @Override |
| public OptionalLong getMeasuredCardinality() { |
| return this.size == 0 ? super.getMeasuredCardinality() : OptionalLong.of(this.size); |
| } |
| |
| @Override |
| public DataSetChannel getChannel() { |
| return DataSetChannel.this; |
| } |
| |
| } |
| |
| } |