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/*
* 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.util
import java.util.EventListener
import scala.language.implicitConversions
import org.apache.spark.TaskContext
import org.apache.spark.annotation.DeveloperApi
/**
* :: DeveloperApi ::
*
* Listener providing a callback function to invoke when a task's execution completes.
*/
@DeveloperApi
trait TaskCompletionListener extends EventListener {
def onTaskCompletion(context: TaskContext): Unit
}
object TaskCompletionListener {
implicit def functionToTaskCompletionListener(f: TaskContext => Unit): TaskCompletionListener =
new TaskCompletionListener {
override def onTaskCompletion(context: TaskContext): Unit = f(context)
}
}
/**
* :: DeveloperApi ::
*
* Listener providing a callback function to invoke when a task's execution encounters an error.
* Operations defined here must be idempotent, as `onTaskFailure` can be called multiple times.
*/
@DeveloperApi
trait TaskFailureListener extends EventListener {
def onTaskFailure(context: TaskContext, error: Throwable): Unit
}
object TaskFailureListener {
implicit def functionToTaskFailureListener(
f: (TaskContext, Throwable) => Unit): TaskFailureListener =
new TaskFailureListener {
override def onTaskFailure(context: TaskContext, error: Throwable): Unit = f(context, error)
}
}
/**
* Exception thrown when there is an exception in executing the callback in TaskCompletionListener.
*/
private[spark]
class TaskCompletionListenerException(
errorMessages: Seq[String],
val previousError: Option[Throwable] = None)
extends RuntimeException {
override def getMessage: String = {
if (errorMessages.size == 1) {
errorMessages.head
} else {
errorMessages.zipWithIndex.map { case (msg, i) => s"Exception $i: $msg" }.mkString("\n")
} +
previousError.map { e =>
"\n\nPrevious exception in task: " + e.getMessage + "\n" +
e.getStackTrace.mkString("\t", "\n\t", "")
}.getOrElse("")
}
}
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