Github user davidyan74 commented on a diff in the pull request:
https://github.com/apache/apex-malhar/pull/319#discussion_r67760503
--- Diff:
stream/src/main/java/org/apache/apex/malhar/stream/window/WindowedStorage.java
---
@@ -0,0 +1,134 @@
+/**
+ * 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.apex.malhar.stream.window;
+
+import com.datatorrent.api.StreamCodec;
+import org.apache.hadoop.classification.InterfaceStability;
+
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * This interface is for a key/value store for storing data for windowed
streams.
+ * The key to this key/value store is a pair of (Window, K)
+ *
+ * Note that this interface does not take recovery into consideration.
+ *
+ */
+@InterfaceStability.Evolving
+public interface WindowedStorage<K, V>
+{
+ /**
+ * Sets the codec (serializer and deserializer) for W. This will be used
when storing and retrieving the window to and
+ * from the storage. In most cases, the starting epoch millis should be
used for TimedWindow and the starting tuple
+ * offset should be used for CountWindow
+ *
+ * @param codec
+ */
+ void setWindowCodec(StreamCodec<Window> codec);
+
+ /**
+ * Sets the codec (serializer and deserializer) for K. This will be used
when storing and retrieving the key to and
+ * from the storage
+ *
+ * @param codec
+ */
+ void setKeyCodec(StreamCodec<K> codec);
+
+ /**
+ * Sets the codec (serializer and deserializer) for V. This will be used
when storing and retrieving the value to and
+ * from the storage
+ *
+ * @param codec
+ */
+ void setValueCodec(StreamCodec<V> codec);
+
+ /**
+ * Sets the data associated with the given window and the key
+ *
+ * @param window
+ * @param key
+ * @param value
+ */
+ void put(Window window, K key, V value);
+
+ /**
+ * Gets the key/value pairs associated with the given window
+ *
+ * @param window
+ * @return
+ */
+ Set<Map.Entry<K, V>> entrySet(Window window);
--- End diff --
done
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