Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/3100#discussion_r20125939
--- Diff: graphx/src/main/scala/org/apache/spark/graphx/EdgeContext.scala
---
@@ -0,0 +1,51 @@
+/*
+ * 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]].
+ */
+trait EdgeContext[VD, ED, A] {
+ /** The vertex id of the edge's source vertex. */
+ def srcId: VertexId
--- End diff --
it'd be better for long's directly instead of VertexId when we expose this.
let's try to make this source compatible though.
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