spark EdgeContext 源码
spark EdgeContext 代码
文件路径：/graphx/src/main/scala/org/apache/spark/graphx/EdgeContext.scala
/*
* 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.spark.graphx
/**
* Represents an edge along with its neighboring vertices and allows sending messages along the
* edge. Used in [[Graph#aggregateMessages]].
*/
abstract class EdgeContext[VD, ED, A] {
/** The vertex id of the edge's source vertex. */
def srcId: VertexId
/** The vertex id of the edge's destination vertex. */
def dstId: VertexId
/** The vertex attribute of the edge's source vertex. */
def srcAttr: VD
/** The vertex attribute of the edge's destination vertex. */
def dstAttr: VD
/** The attribute associated with the edge. */
def attr: ED
/** Sends a message to the source vertex. */
def sendToSrc(msg: A): Unit
/** Sends a message to the destination vertex. */
def sendToDst(msg: A): Unit
/** Converts the edge and vertex properties into an [[EdgeTriplet]] for convenience. */
def toEdgeTriplet: EdgeTriplet[VD, ED] = {
val et = new EdgeTriplet[VD, ED]
et.srcId = srcId
et.srcAttr = srcAttr
et.dstId = dstId
et.dstAttr = dstAttr
et.attr = attr
et
}
}
object EdgeContext {
/**
* Extractor mainly used for Graph#aggregateMessages*.
* Example:
* {{{
* val messages = graph.aggregateMessages(
* case ctx @ EdgeContext(_, _, _, _, attr) =>
* ctx.sendToDst(attr)
* , _ + _)
* }}}
*/
def unapply[VD, ED, A](edge: EdgeContext[VD, ED, A]): Some[(VertexId, VertexId, VD, VD, ED)] =
Some((edge.srcId, edge.dstId, edge.srcAttr, edge.dstAttr, edge.attr))
}
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