net.java.truevfs.ext.pace.AspectController.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._
import javax.annotation.concurrent._
import net.java.truecommons.shed._
import net.java.truevfs.kernel.spec._
import net.java.truevfs.kernel.spec.cio._
import net.java.truevfs.kernel.spec.cio.Entry._

/** Applies an aspect to every file system operation.
  * 
  * @see    #apply
  * @author Christian Schlichtherle
  */
@ThreadSafe
private abstract class AspectController(c: FsController)
extends FsDecoratingController(c) {

  /**
    * Applies an aspect to the given file system operation.
    * 
    * @param  operation the file system operation to apply an aspect to.
    * @return The return value of the file system operation.
    */
  def apply[V](operation: => V): V

  private type AccessOptions = BitField[FsAccessOption]

  override def node(options: AccessOptions, name: FsNodeName) =
    apply(c node (options, name))

  override def checkAccess(options: AccessOptions, name: FsNodeName, types: BitField[Access]) =
    apply(c checkAccess (options, name, types))

  override def setReadOnly(name: FsNodeName) =
    apply(c setReadOnly (name))

  override def setTime(options: AccessOptions, name: FsNodeName, times: java.util.Map[Access, java.lang.Long]) =
    apply(c setTime (options, name, times))

  override def setTime(options: AccessOptions, name: FsNodeName, types: BitField[Access], value: Long) =
    apply(c setTime (options, name, types, value))

  override def input(options: AccessOptions, name: FsNodeName) =
    new AspectInputSocket(c input (options, name))

  protected class AspectInputSocket(socket: InputSocket[_ <: Entry])
  extends AbstractInputSocket[Entry] {
    override def target() = apply(socket target ())

    override def stream(peer: OutputSocket[_ <: Entry]) =
      apply(socket stream peer)

    override def channel(peer: OutputSocket[_ <: Entry]) =
      apply(socket channel peer)
  }

  override def output(options: AccessOptions, name: FsNodeName, @CheckForNull template: Entry) =
    new AspectOutputSocket(c output (options, name, template))

  protected class AspectOutputSocket(socket: OutputSocket[_ <: Entry])
  extends AbstractOutputSocket[Entry] {
    override def target() = apply(socket target ())

    override def stream(peer: InputSocket[_ <: Entry]) =
      apply(socket stream peer)

    override def channel(peer: InputSocket[_ <: Entry]) =
      apply(socket channel peer)
  }

  override def make(options: AccessOptions, name: FsNodeName, tµpe: Type, @CheckForNull template: Entry) =
    apply(c make (options, name, tµpe, template))

  override def unlink(options: AccessOptions, name: FsNodeName) =
    apply(c unlink (options, name))

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