taegeonum commented on a change in pull request #137: [NEMO-232] Implement 
InputWatermarkManager
URL: https://github.com/apache/incubator-nemo/pull/137#discussion_r229895793
 
 

 ##########
 File path: 
runtime/executor/src/main/java/org/apache/nemo/runtime/executor/datatransfer/MultiInputWatermarkManager.java
 ##########
 @@ -0,0 +1,78 @@
+/*
+ * 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.nemo.runtime.executor.datatransfer;
+
+import org.apache.nemo.common.ir.vertex.OperatorVertex;
+import org.apache.nemo.common.punctuation.Watermark;
+
+/**
+ * This tracks the minimum input watermark among multiple input streams.
+ */
+public final class MultiInputWatermarkManager implements InputWatermarkManager 
{
+  private final Watermark[] watermarks;
+  private final OperatorVertex nextOperator;
+  private int minWatermarkIndex;
+  public MultiInputWatermarkManager(final int numEdges,
+                                    final OperatorVertex nextOperator) {
+    super();
+    this.watermarks = new Watermark[numEdges];
+    this.nextOperator = nextOperator;
+    this.minWatermarkIndex = 0;
+    // We initialize watermarks as min value because
+    // we should not emit watermark until all edges emit watermarks.
+    for (int i = 0; i < numEdges; i++) {
+      watermarks[i] = new Watermark(Long.MIN_VALUE);
+    }
+  }
+
+  private int findNextMinWatermarkIndex() {
 
 Review comment:
   This returns index, so we cannot use Collections.min

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