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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
/**
* 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.
*
* @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)
def getTimeMillis(): Long =
synchronized {
time
}
/**
* @param timeToSet new time (in milliseconds) that the clock should represent
*/
def setTime(timeToSet: Long) =
synchronized {
time = timeToSet
notifyAll()
}
/**
* @param timeToAdd time (in milliseconds) to add to the clock's time
*/
def advance(timeToAdd: Long) =
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
*/
def waitTillTime(targetTime: Long): Long =
synchronized {
while (time < targetTime) {
wait(100)
}
getTimeMillis()
}
}
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