spark RpcEndpointRef 源码
spark RpcEndpointRef 代码
文件路径:/core/src/main/scala/org/apache/spark/rpc/RpcEndpointRef.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
import scala.concurrent.Future
import scala.reflect.ClassTag
import org.apache.spark.SparkConf
import org.apache.spark.internal.Logging
import org.apache.spark.util.RpcUtils
/**
* A reference for a remote [[RpcEndpoint]]. [[RpcEndpointRef]] is thread-safe.
*/
private[spark] abstract class RpcEndpointRef(conf: SparkConf)
extends Serializable with Logging {
private[this] val defaultAskTimeout = RpcUtils.askRpcTimeout(conf)
/**
* return the address for the [[RpcEndpointRef]]
*/
def address: RpcAddress
def name: String
/**
* Sends a one-way asynchronous message. Fire-and-forget semantics.
*/
def send(message: Any): Unit
/**
* Send a message to the corresponding [[RpcEndpoint.receiveAndReply)]] and return a
* [[AbortableRpcFuture]] to receive the reply within the specified timeout.
* The [[AbortableRpcFuture]] instance wraps [[Future]] with additional `abort` method.
*
* This method only sends the message once and never retries.
*/
def askAbortable[T: ClassTag](message: Any, timeout: RpcTimeout): AbortableRpcFuture[T] = {
throw new UnsupportedOperationException()
}
/**
* Send a message to the corresponding [[RpcEndpoint.receiveAndReply)]] and return a [[Future]] to
* receive the reply within the specified timeout.
*
* This method only sends the message once and never retries.
*/
def ask[T: ClassTag](message: Any, timeout: RpcTimeout): Future[T]
/**
* Send a message to the corresponding [[RpcEndpoint.receiveAndReply)]] and return a [[Future]] to
* receive the reply within a default timeout.
*
* This method only sends the message once and never retries.
*/
def ask[T: ClassTag](message: Any): Future[T] = ask(message, defaultAskTimeout)
/**
* Send a message to the corresponding [[RpcEndpoint.receiveAndReply]] and get its result within a
* default timeout, throw an exception if this fails.
*
* Note: this is a blocking action which may cost a lot of time, so don't call it in a message
* loop of [[RpcEndpoint]].
* @param message the message to send
* @tparam T type of the reply message
* @return the reply message from the corresponding [[RpcEndpoint]]
*/
def askSync[T: ClassTag](message: Any): T = askSync(message, defaultAskTimeout)
/**
* Send a message to the corresponding [[RpcEndpoint.receiveAndReply]] and get its result within a
* specified timeout, throw an exception if this fails.
*
* Note: this is a blocking action which may cost a lot of time, so don't call it in a message
* loop of [[RpcEndpoint]].
*
* @param message the message to send
* @param timeout the timeout duration
* @tparam T type of the reply message
* @return the reply message from the corresponding [[RpcEndpoint]]
*/
def askSync[T: ClassTag](message: Any, timeout: RpcTimeout): T = {
val future = ask[T](message, timeout)
timeout.awaitResult(future)
}
}
/**
* An exception thrown if the RPC is aborted.
*/
private[spark] class RpcAbortException(message: String) extends Exception(message)
/**
* A wrapper for [[Future]] but add abort method.
* This is used in long run RPC and provide an approach to abort the RPC.
*/
private[spark]
class AbortableRpcFuture[T: ClassTag](val future: Future[T], onAbort: Throwable => Unit) {
def abort(t: Throwable): Unit = onAbort(t)
}
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