gaoyunhaii commented on a change in pull request #11: URL: https://github.com/apache/flink-ml/pull/11#discussion_r739284296
########## File path: flink-ml-iteration/src/main/java/org/apache/flink/iteration/compile/DraftExecutionEnvironment.java ########## @@ -0,0 +1,228 @@ +/* + * 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.flink.iteration.compile; + +import org.apache.flink.annotation.VisibleForTesting; +import org.apache.flink.api.common.ExecutionConfig; +import org.apache.flink.api.common.JobExecutionResult; +import org.apache.flink.api.common.typeinfo.TypeInformation; +import org.apache.flink.api.dag.Transformation; +import org.apache.flink.core.execution.DefaultExecutorServiceLoader; +import org.apache.flink.iteration.compile.translator.BroadcastStateTransformationTranslator; +import org.apache.flink.iteration.compile.translator.KeyedBroadcastStateTransformationTranslator; +import org.apache.flink.iteration.compile.translator.MultipleInputTransformationTranslator; +import org.apache.flink.iteration.compile.translator.OneInputTransformationTranslator; +import org.apache.flink.iteration.compile.translator.PartitionTransformationTranslator; +import org.apache.flink.iteration.compile.translator.ReduceTransformationTranslator; +import org.apache.flink.iteration.compile.translator.SideOutputTransformationTranslator; +import org.apache.flink.iteration.compile.translator.TwoInputTransformationTranslator; +import org.apache.flink.iteration.compile.translator.UnionTransformationTranslator; +import org.apache.flink.iteration.operator.OperatorWrapper; +import org.apache.flink.iteration.utils.ReflectionUtils; +import org.apache.flink.streaming.api.datastream.DataStream; +import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; +import org.apache.flink.streaming.api.functions.source.RichParallelSourceFunction; +import org.apache.flink.streaming.api.graph.StreamGraph; +import org.apache.flink.streaming.api.transformations.BroadcastStateTransformation; +import org.apache.flink.streaming.api.transformations.KeyedBroadcastStateTransformation; +import org.apache.flink.streaming.api.transformations.KeyedMultipleInputTransformation; +import org.apache.flink.streaming.api.transformations.MultipleInputTransformation; +import org.apache.flink.streaming.api.transformations.OneInputTransformation; +import org.apache.flink.streaming.api.transformations.PartitionTransformation; +import org.apache.flink.streaming.api.transformations.ReduceTransformation; +import org.apache.flink.streaming.api.transformations.SideOutputTransformation; +import org.apache.flink.streaming.api.transformations.TwoInputTransformation; +import org.apache.flink.streaming.api.transformations.UnionTransformation; + +import java.util.HashMap; +import java.util.Map; +import java.util.Objects; + +import static org.apache.flink.util.Preconditions.checkState; + +/** + * A specialized stream execution environment that allows users to first construct a subgraph and + * later copy the transformations into the actual environment. During the copying it could apply + * some kinds of {@link OperatorWrapper} to change the operators in each transformation. + */ +public class DraftExecutionEnvironment extends StreamExecutionEnvironment { + + @SuppressWarnings("rawtypes") + private static final Map<Class<? extends Transformation>, DraftTransformationTranslator> + translators = new HashMap<>(); + + static { + translators.put( + BroadcastStateTransformation.class, new BroadcastStateTransformationTranslator()); + translators.put( + KeyedBroadcastStateTransformation.class, + new KeyedBroadcastStateTransformationTranslator()); + translators.put( + KeyedMultipleInputTransformation.class, + new KeyedBroadcastStateTransformationTranslator()); + translators.put( + MultipleInputTransformation.class, new MultipleInputTransformationTranslator()); + translators.put(OneInputTransformation.class, new OneInputTransformationTranslator()); + translators.put(PartitionTransformation.class, new PartitionTransformationTranslator()); + translators.put(ReduceTransformation.class, new ReduceTransformationTranslator()); + translators.put(SideOutputTransformation.class, new SideOutputTransformationTranslator()); + translators.put(TwoInputTransformation.class, new TwoInputTransformationTranslator()); + translators.put(UnionTransformation.class, new UnionTransformationTranslator()); + } + + private final StreamExecutionEnvironment actualEnv; + + private final Map<Integer, OperatorWrapper<?, ?>> draftWrappers; + + private final Map<Integer, Transformation<?>> draftToActualTransformations; + + private OperatorWrapper<?, ?> currentWrapper; Review comment: This would be used in the future PR: for example, we would start with AllRound wrapper, but when users use `forEachRound`, we would switch to the `PerRoundWrapper` when transforming those part. -- This is an automated message from the Apache Git Service. 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