sanha commented on a change in pull request #2: [NEMO-7] Intra-TaskGroup 
pipelining
URL: https://github.com/apache/incubator-nemo/pull/2#discussion_r173049922
 
 

 ##########
 File path: 
runtime/executor/src/main/java/edu/snu/nemo/runtime/executor/datatransfer/TaskDataHandler.java
 ##########
 @@ -0,0 +1,94 @@
+/*
+ * 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 edu.snu.nemo.runtime.executor.datatransfer;
+
+import edu.snu.nemo.runtime.common.plan.physical.Task;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Per-Task data handler.
+ */
+public final class TaskDataHandler {
+  private static final Logger LOG = 
LoggerFactory.getLogger(TaskDataHandler.class.getName());
+
+  public TaskDataHandler(final Task task) {
+    this.task = task;
+    this.outputCollector = null;
+    this.outputWriters = new ArrayList<>();
+    this.inputFromThisStage = new ArrayList<>();
+    this.sideInputFromOtherStages = new ArrayList<>();
+    this.sideInputFromThisStage = new ArrayList<>();
+  }
+
+  private final Task task;
+  private OutputCollectorImpl outputCollector;
 
 Review comment:
   `Nullable`?

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