net.java.truevfs.ext.pacemaker.PaceMediator.scala Maven / Gradle / Ivy

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Constrains the number of concurrently mounted archive file systems in order to save some heap space. This module provides a JMX interface for monitoring and management. Add the JAR artifact of this module to the run time class path to make its services available for service location in the client API modules.

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/*
 * Copyright (C) 2005-2015 Schlichtherle IT Services.
 * All rights reserved. Use is subject to license terms.
 */
package net.java.truevfs.ext.pacemaker

import net.java.truevfs.comp.inst._
import net.java.truevfs.comp.jmx._
import net.java.truevfs.kernel.spec._

/** A mediator for the instrumentation of the TrueVFS Kernel with a
  * [[PaceManager]] and a [[PaceController]].
  *
  * @author Christian Schlichtherle
  */
private class PaceMediator extends JmxMediator[PaceMediator] with Immutable {

  final val cachedMountPoints = new LruCache[FsMountPoint](maximumFileSystemsMountedDefaultValue)
  final val evictedMountPoints = cachedMountPoints.evicted

  final def maximumSize = cachedMountPoints.maximumSize
  final def maximumSize_=(maximumSize: Int) {
    require(maximumSize >= maximumFileSystemsMountedMinimumValue)
    cachedMountPoints.maximumSize = maximumSize
  }

  final override def instrument(subject: FsManager) =
    activate(new PaceManager(this, subject))

  final override def instrument(context: InstrumentingManager[PaceMediator], subject: FsController) =
    new PaceController(context.asInstanceOf[PaceManager], subject)

  final override def instrument(context: InstrumentingManager[PaceMediator], subject: FsCompositeDriver) =
    new InstrumentingCompositeDriver(this, subject)

  final override def instrument(context: InstrumentingCompositeDriver[PaceMediator], subject: FsModel) =
    new PaceModel(this, subject)
}

private object PaceMediator extends PaceMediator