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From davidyan74 <...@git.apache.org>
Subject [GitHub] apex-malhar pull request #319: REVIEW ONLY: Operator supporting the Beam con...
Date Mon, 20 Jun 2016 20:30:42 GMT
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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