| /* |
| * 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.core.platform; |
| |
| import org.apache.wayang.core.optimizer.OptimizationContext; |
| import org.apache.wayang.core.plan.executionplan.ExecutionTask; |
| import org.apache.wayang.core.plan.wayangplan.ExecutionOperator; |
| import org.apache.wayang.core.platform.lineage.ChannelLineageNode; |
| import org.apache.logging.log4j.LogManager; |
| |
| import java.util.OptionalLong; |
| |
| /** |
| * Template for {@link ChannelInstance} implementations. |
| */ |
| public abstract class AbstractChannelInstance extends ExecutionResourceTemplate implements ChannelInstance { |
| |
| private OptionalLong measuredCardinality = OptionalLong.empty(); |
| |
| private boolean wasProduced = false; |
| |
| /** |
| * The {@link OptimizationContext.OperatorContext} of the {@link ExecutionOperator} that is producing this |
| * instance. |
| */ |
| private final OptimizationContext.OperatorContext producerOperatorContext; |
| |
| private ChannelLineageNode lineage; |
| |
| /** |
| * Creates a new instance and registers it with its {@link Executor}. |
| * |
| * @param executor that maintains this instance |
| * @param producerOperatorContext the {@link OptimizationContext.OperatorContext} for the producing |
| * {@link ExecutionOperator} |
| * @param producerOutputIndex the output index of the producer {@link ExecutionTask} |
| */ |
| protected AbstractChannelInstance(Executor executor, |
| OptimizationContext.OperatorContext producerOperatorContext, |
| int producerOutputIndex) { |
| super(executor); |
| this.lineage = new ChannelLineageNode(this); |
| this.producerOperatorContext = producerOperatorContext; |
| } |
| |
| @Override |
| public OptionalLong getMeasuredCardinality() { |
| return this.measuredCardinality; |
| } |
| |
| @Override |
| public void setMeasuredCardinality(long cardinality) { |
| this.measuredCardinality.ifPresent(oldCardinality -> { |
| if (oldCardinality != cardinality) { |
| LogManager.getLogger(this.getClass()).warn( |
| "Replacing existing measured cardinality of {} with {} (was {}).", |
| this.getChannel(), |
| cardinality, |
| oldCardinality |
| ); |
| } |
| }); |
| this.measuredCardinality = OptionalLong.of(cardinality); |
| } |
| |
| @Override |
| public ChannelLineageNode getLineage() { |
| return this.lineage; |
| } |
| |
| @Override |
| public boolean wasProduced() { |
| return this.wasProduced; |
| } |
| |
| @Override |
| public void markProduced() { |
| this.wasProduced = true; |
| } |
| |
| @Override |
| public OptimizationContext.OperatorContext getProducerOperatorContext() { |
| return this.producerOperatorContext; |
| } |
| |
| @Override |
| public String toString() { |
| return "*" + this.getChannel().toString(); |
| } |
| } |