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	id 2CD6BDFD4C; Sun,  8 Mar 2015 20:56:11 +0000 (UTC)
From: vasia <git@git.apache.org>
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References: <git-pr-408-flink@git.apache.org>
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Subject: [GitHub] flink pull request: [FLINK-1514][Gelly] Add a
 Gather-Sum-Apply ite...
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Message-Id: <20150308205611.2CD6BDFD4C@git1-us-west.apache.org>
Date: Sun,  8 Mar 2015 20:56:11 +0000 (UTC)
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Github user vasia commented on a diff in the pull request:

    https://github.com/apache/flink/pull/408#discussion_r26008874
  
    --- Diff: flink-staging/flink-gelly/src/main/java/org/apache/flink/graph/gsa/ApplyFunction.java ---
    @@ -0,0 +1,69 @@
    +/*
    + * 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.flink.graph.gsa;
    +
    +import org.apache.flink.api.common.functions.IterationRuntimeContext;
    +import org.apache.flink.util.Collector;
    +
    +import java.io.Serializable;
    +
    +public abstract class ApplyFunction<VV extends Serializable, EV extends Serializable, M> implements Serializable {
    +
    +	public abstract void apply(M message, VV vertexValue);
    --- End diff --
    
    this is so that we can take advantage of the workset and be able to emit only changed values here, when the update function is incremental.


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