| /* |
| * 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.mapping; |
| |
| import java.util.Collection; |
| import java.util.Collections; |
| import org.apache.wayang.basic.operators.DoWhileOperator; |
| import org.apache.wayang.core.function.PredicateDescriptor; |
| import org.apache.wayang.core.mapping.Mapping; |
| import org.apache.wayang.core.mapping.OperatorPattern; |
| import org.apache.wayang.core.mapping.PlanTransformation; |
| import org.apache.wayang.core.mapping.ReplacementSubplanFactory; |
| import org.apache.wayang.core.mapping.SubplanPattern; |
| import org.apache.wayang.core.types.DataSetType; |
| import org.apache.wayang.flink.operators.FlinkDoWhileOperator; |
| import org.apache.wayang.flink.platform.FlinkPlatform; |
| |
| /** |
| * Mapping from {@link DoWhileOperator} to {@link FlinkDoWhileOperator}. |
| */ |
| @SuppressWarnings("unchecked") |
| public class DoWhileMapping implements Mapping { |
| @Override |
| public Collection<PlanTransformation> getTransformations() { |
| return Collections.singleton( |
| new PlanTransformation( |
| this.createSubplanPattern(), |
| this.createReplacementSubplanFactory(), |
| FlinkPlatform.getInstance() |
| ) |
| ); |
| } |
| |
| @SuppressWarnings("unchecked") |
| private SubplanPattern createSubplanPattern() { |
| final OperatorPattern operatorPattern = new OperatorPattern( |
| "loop", new DoWhileOperator<>(DataSetType.none(), DataSetType.none(), (PredicateDescriptor) null, 1), false); |
| return SubplanPattern.createSingleton(operatorPattern); |
| } |
| |
| private ReplacementSubplanFactory createReplacementSubplanFactory() { |
| return new ReplacementSubplanFactory.OfSingleOperators<DoWhileOperator<?, ?>>( |
| (matchedOperator, epoch) -> new FlinkDoWhileOperator<>(matchedOperator).at(epoch) |
| ); |
| } |
| } |