[GitHub] [flink-ml] gaoyunhaii commented on a change in pull request #11: [FLINK-5][iteration] Add DraftExecutionEnvironment to support wrapping operators during compile time

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gaoyunhaii commented on a change in pull request #11:
URL: https://github.com/apache/flink-ml/pull/11#discussion_r722060036



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File path: flink-ml-iteration/src/main/java/org/apache/flink/ml/iteration/operator/OperatorWrapper.java
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@@ -0,0 +1,36 @@
+/*
+ * 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.ml.iteration.operator;
+
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.streaming.api.operators.StreamOperator;
+import org.apache.flink.streaming.api.operators.StreamOperatorFactory;
+import org.apache.flink.streaming.api.operators.StreamOperatorParameters;
+
+import java.io.Serializable;
+
+/** Wrappers for the given operator factory. */
+public interface OperatorWrapper<T, R> extends Serializable {

Review comment:
       There are two implements in the following PRs as a whole:
   1. AllRoundOperatorWrapper: with this wrapper all the round is processed by a single operator instance.
   2. PerRoundOperatorWrapper: with this wrapper each round of data is processed by a new operator instance. This enables us to reuse the operators defined outside of the iteration. 




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