Github user sun-rui commented on a diff in the pull request:
https://github.com/apache/spark/pull/8458#discussion_r39115489
--- Diff: core/src/main/scala/org/apache/spark/api/r/RBackendHandler.scala
---
@@ -166,40 +178,75 @@ private[r] class RBackendHandler(server: RBackend)
// Read a number of arguments from the data input stream
def readArgs(numArgs: Int, dis: DataInputStream):
Array[java.lang.Object] = {
- (0 until numArgs).map { arg =>
+ (0 until numArgs).map { _ =>
readObject(dis)
}.toArray
}
- // Checks if the arguments passed in args matches the parameter types.
- // NOTE: Currently we do exact match. We may add type conversions later.
+ // Find a matching method in all methods of the same name of a class
+ // according to the passed arguments. Arguments may be converted in
+ // order to match a method.
+ //
+ // Returns an Option[Int] which is the index of the matched method in
--- End diff --
In java reflection, constructors and normal methods are of different
classes, and share no parent class that provides methods for reflection uses. I
can't find a unified way to handle them in this function, so I have to pass in
parameterTypes: Array[Class[_]] and return an index.
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