net.java.truevfs.ext.insight.I5tSeekableChannel.scala Maven / Gradle / Ivy

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Instruments the TrueVFS Kernel for statistics monitoring via JMX. 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) 2005-2013 Schlichtherle IT Services.
 * All rights reserved. Use is subject to license terms.
 */
package net.java.truevfs.ext.insight

import java.nio._
import java.nio.channels._
import javax.annotation._
import javax.annotation.concurrent._
import net.java.truevfs.comp.inst._
import net.java.truevfs.comp.jmx._

/**
 * A controller for a [[java.nio.channels.SeekableByteChannel]].
 *
 * @author Christian Schlichtherle
 */
@NotThreadSafe
private final class I5tSeekableChannel(
  mediator: I5tMediator, @WillCloseWhenClosed channel: SeekableByteChannel
) extends InstrumentingSeekableChannel(mediator, channel) with JmxComponent {

  override def activate() { }

  override def read(buf: ByteBuffer) = {
    val start = System.nanoTime
    val ret = channel read buf
    if (0 <= ret) mediator logRead (System.nanoTime - start, ret)
    ret
  }

  override def write(buf: ByteBuffer) = {
    val start = System.nanoTime
    val ret = channel write buf
    mediator logWrite (System.nanoTime - start, ret)
    ret
  }
}