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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
import scala.collection.mutable.ArrayBuffer
import org.apache.spark.annotation.DeveloperApi
import org.apache.spark.executor.TaskMetrics
/**
* :: DeveloperApi ::
* Contextual information about a task which can be read or mutated during execution.
*/
@DeveloperApi
class TaskContext(
val stageId: Int,
val partitionId: Int,
val attemptId: Long,
val runningLocally: Boolean = false,
private[spark] val taskMetrics: TaskMetrics = TaskMetrics.empty)
extends Serializable {
@deprecated("use partitionId", "0.8.1")
def splitId = partitionId
// List of callback functions to execute when the task completes.
@transient private val onCompleteCallbacks = new ArrayBuffer[() => Unit]
// Whether the corresponding task has been killed.
@volatile var interrupted: Boolean = false
// Whether the task has completed, before the onCompleteCallbacks are executed.
@volatile var completed: Boolean = false
/**
* Add a callback function to be executed on task completion. An example use
* is for HadoopRDD to register a callback to close the input stream.
* Will be called in any situation - success, failure, or cancellation.
* @param f Callback function.
*/
def addOnCompleteCallback(f: () => Unit) {
onCompleteCallbacks += f
}
def executeOnCompleteCallbacks() {
completed = true
// Process complete callbacks in the reverse order of registration
onCompleteCallbacks.reverse.foreach { _() }
}
}
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