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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 spark.scheduler
import scala.collection.mutable.ArrayBuffer
/**
* An object that waits for a DAGScheduler job to complete. As tasks finish, it passes their
* results to the given handler function.
*/
private[spark] class JobWaiter[T](totalTasks: Int, resultHandler: (Int, T) => Unit)
extends JobListener {
private var finishedTasks = 0
private var jobFinished = false // Is the job as a whole finished (succeeded or failed)?
private var jobResult: JobResult = null // If the job is finished, this will be its result
override def taskSucceeded(index: Int, result: Any) {
synchronized {
if (jobFinished) {
throw new UnsupportedOperationException("taskSucceeded() called on a finished JobWaiter")
}
resultHandler(index, result.asInstanceOf[T])
finishedTasks += 1
if (finishedTasks == totalTasks) {
jobFinished = true
jobResult = JobSucceeded
this.notifyAll()
}
}
}
override def jobFailed(exception: Exception) {
synchronized {
if (jobFinished) {
throw new UnsupportedOperationException("jobFailed() called on a finished JobWaiter")
}
jobFinished = true
jobResult = JobFailed(exception, None)
this.notifyAll()
}
}
def awaitResult(): JobResult = synchronized {
while (!jobFinished) {
this.wait()
}
return jobResult
}
}
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