com.stratio.cassandra.lucene.util.Locker.scala Maven / Gradle / Ivy
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/*
* Copyright (C) 2014 Stratio (http://stratio.com)
*
* Licensed 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 com.stratio.cassandra.lucene.util
/** Class to execute code in mutual exclusion based on the hashcode of an object.
*
* @param numLocks the number of underlying concurrent locks
* @author Andres de la Pena `[email protected]`
*/
class Locker(numLocks: Int) {
if (numLocks <= 0) throw new IllegalArgumentException(
s"The number of concurrent locks should be strictly positive but found $numLocks")
private val locks = (1 to numLocks).map(_ => new Object()).toArray
/** Runs the specified task in mutual exclusion based on the hashcode of the specified id */
def run[A](id: AnyRef, task: () => A): Unit = {
locks(Math.abs(id.hashCode % numLocks)).synchronized {task.apply()}
}
}