spark RpcEndpointVerifier 源码
spark RpcEndpointVerifier 代码
文件路径：/core/src/main/scala/org/apache/spark/rpc/netty/RpcEndpointVerifier.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.rpc.netty
import org.apache.spark.rpc.{RpcCallContext, RpcEndpoint, RpcEnv}
/**
* An [[RpcEndpoint]] for remote [[RpcEnv]]s to query if an `RpcEndpoint` exists.
*
* This is used when setting up a remote endpoint reference.
*/
private[netty] class RpcEndpointVerifier(override val rpcEnv: RpcEnv, dispatcher: Dispatcher)
extends RpcEndpoint {
override def receiveAndReply(context: RpcCallContext): PartialFunction[Any, Unit] = {
case RpcEndpointVerifier.CheckExistence(name) => context.reply(dispatcher.verify(name))
}
}
private[netty] object RpcEndpointVerifier {
val NAME = "endpoint-verifier"
/** A message used to ask the remote [[RpcEndpointVerifier]] if an `RpcEndpoint` exists. */
case class CheckExistence(name: String)
}
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