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Subject [GitHub] taegeonum commented on a change in pull request #122: [NEMO-213] Use Beam's DoFnRunners to execute DoFn
Date Wed, 10 Oct 2018 04:32:08 GMT
taegeonum commented on a change in pull request #122: [NEMO-213] Use Beam's DoFnRunners to
execute DoFn
URL: https://github.com/apache/incubator-nemo/pull/122#discussion_r223933793
 
 

 ##########
 File path: compiler/frontend/beam/src/main/java/org/apache/nemo/compiler/frontend/beam/transform/StatefulDoFnTransform.java
 ##########
 @@ -0,0 +1,169 @@
+/*
+ * Copyright (C) 2018 Seoul National University
+ *
+ * Licensed 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.nemo.compiler.frontend.beam.transform;
+
+import org.apache.beam.runners.core.*;
+import org.apache.beam.runners.core.construction.SerializablePipelineOptions;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.reflect.DoFnInvoker;
+import org.apache.beam.sdk.transforms.reflect.DoFnInvokers;
+import org.apache.beam.sdk.util.WindowedValue;
+import org.apache.beam.sdk.values.KV;
+import org.apache.beam.sdk.values.PCollectionView;
+import org.apache.beam.sdk.values.TupleTag;
+import org.apache.beam.sdk.values.WindowingStrategy;
+import org.apache.nemo.common.ir.OutputCollector;
+import org.apache.nemo.common.ir.vertex.transform.Transform;
+import org.apache.nemo.compiler.frontend.beam.NemoPipelineOptions;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Stateful DoFn transform implementation.
+ * This implementation supposes that the inputs are KV.
+ * We then process the inputs that have the same key in the same doFnRunner for stateful
processing.
+ *
+ * @param <K> key type.
+ * @param <InputT> input type.
+ * @param <OutputT> output type.
+ */
+public final class StatefulDoFnTransform<K, InputT, OutputT> implements
 
 Review comment:
   This class is for `StatefulDoFn` but current PR does not fully support the `StatefulDoFn`.
I will remove this class in this PR. 

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