spark ManualClock 源码
spark ManualClock 代码
文件路径：/core/src/main/scala/org/apache/spark/util/ManualClock.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.util
import java.util.concurrent.TimeUnit
/**
* A `Clock` whose time can be manually set and modified. Its reported time does not change
* as time elapses, but only as its time is modified by callers. This is mainly useful for
* testing.
*
* For this implementation, `getTimeMillis()` and `nanoTime()` always return the same value
* (adjusted for the correct unit).
*
* @param time initial time (in milliseconds since the epoch)
*/
private[spark] class ManualClock(private var time: Long) extends Clock {
/**
* @return `ManualClock` with initial time 0
*/
def this() = this(0L)
override def getTimeMillis(): Long = synchronized {
time
}
override def nanoTime(): Long = TimeUnit.MILLISECONDS.toNanos(getTimeMillis())
/**
* @param timeToSet new time (in milliseconds) that the clock should represent
*/
def setTime(timeToSet: Long): Unit = synchronized {
time = timeToSet
notifyAll()
}
/**
* @param timeToAdd time (in milliseconds) to add to the clock's time
*/
def advance(timeToAdd: Long): Unit = synchronized {
time += timeToAdd
notifyAll()
}
/**
* @param targetTime block until the clock time is set or advanced to at least this time
* @return current time reported by the clock when waiting finishes
*/
override def waitTillTime(targetTime: Long): Long = synchronized {
while (time < targetTime) {
wait(10)
}
getTimeMillis()
}
}
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