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From gauravgopi123 <...@git.apache.org>
Subject [GitHub] incubator-apex-malhar pull request: Stream API
Date Thu, 12 May 2016 00:30:57 GMT
Github user gauravgopi123 commented on a diff in the pull request:

    https://github.com/apache/incubator-apex-malhar/pull/261#discussion_r62949738
  
    --- Diff: stream/src/main/java/org/apache/apex/malhar/stream/api/AggregationStream.java
---
    @@ -0,0 +1,35 @@
    +/**
    + * 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.api;
    +
    +/**
    + * A stream with aggregation transformation
    + * All aggregation transformation would support
    + * @ Watermark - Ingestion time watermark / natural tuple watermark
    + * @ Early Triggers - How frequent to emit real-time partial result
    + * @ Late Triggers - When to emit updated result with tuple comes after watermark
    + * @ Spool state -  When the in memory aggregation run out of memory
    + * @ 3 different aggregation model: ignore, accumulation, accumulation + delta
    + * @ Window support, sliding window, moving window, session window base on 3 different
tuple time
    + * @ 3 Differernt tuple time support: event time, system time, ingestion time
    + * @param <T>
    + */
    +public interface AggregationStream<T> extends ApexStream<T>
    --- End diff --
    
    Why is this interface needed?


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