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core/src/main/scala/org/apache/spark/util/ManualClock.scala
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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. | ||
*/ | ||
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package org.apache.spark.util | ||
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/** | ||
* 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 { | ||
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/** | ||
* @return `ManualClock` with initial time 0 | ||
*/ | ||
def this() = this(0L) | ||
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def getTimeMillis(): Long = | ||
synchronized { | ||
time | ||
} | ||
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/** | ||
* @param timeToSet new time (in milliseconds) that the clock should represent | ||
*/ | ||
def setTime(timeToSet: Long) = | ||
synchronized { | ||
time = timeToSet | ||
notifyAll() | ||
} | ||
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/** | ||
* @param timeToAdd time (in milliseconds) to add to the clock's time | ||
*/ | ||
def advance(timeToAdd: Long) = | ||
synchronized { | ||
time += timeToAdd | ||
notifyAll() | ||
} | ||
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/** | ||
* @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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} |
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