net.java.truevfs.ext.pace.PaceController.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) 2005-2012 Schlichtherle IT Services.
 * All rights reserved. Use is subject to license terms.
 */
package net.java.truevfs.ext.pace

import javax.annotation.concurrent._
import net.java.truecommons.shed._
import net.java.truevfs.kernel.spec._

/**
  * Calls back the given pace manager before and after each file system
  * operation in order to sync the least recently accessed file systems which
  * exceed the maximum number of mounted file systems and then register itself
  * as the most recently accessed file system.
  * 
  * @author Christian Schlichtherle
  */
@ThreadSafe
private final class PaceController(m: PaceManager, c: FsController)
extends AspectController(c) {

  override def apply[V](operation: => V) = {
    m retain c
    val r = operation
    m accessed c
    r
  }

  override def sync(options: BitField[FsSyncOption]) = c sync options // skip apply!
}