acpiplugin.java

来自「纯java操作系统jnode,安装简单和操作简单的个人使用的Java操作系统」· Java 代码 · 共 103 行

/*
 * $Id: AcpiPlugin.java,v 1.1 2003/11/25 11:42:14 epr Exp $
 */
package org.jnode.driver.acpi;

import javax.naming.NameNotFoundException;

import org.apache.log4j.Logger;
import org.jnode.driver.Device;
import org.jnode.driver.DeviceListener;
import org.jnode.driver.DeviceUtils;
import org.jnode.driver.firmware.FirmwareAPI;
import org.jnode.plugin.Plugin;
import org.jnode.plugin.PluginDescriptor;
import org.jnode.plugin.PluginException;
import org.jnode.system.ResourceNotFreeException;

/**
 * ACPI plugin.
 * 
 * <p>
 * Title:
 * </p>
 * <p>
 * Description:
 * </p>
 * <p>
 * Copyright: Copyright (c) 2003
 * </p>
 * <p>
 * Company:
 * </p>
 * 
 * @author not attributable
 * @version 1.0
 */

public class AcpiPlugin extends Plugin implements DeviceListener {

	private final Logger log = Logger.getLogger(getClass());
	private Device fwDevice;
	private ACPI acpi;

	/**
	 * Initialize this instance.
	 * @param descriptor
	 */
	public AcpiPlugin(PluginDescriptor descriptor) {
		super(descriptor);
	}

	/**
	 * Start the plugin
	 * @throws PluginException
	 */
	protected void startPlugin() throws org.jnode.plugin.PluginException {
		try {
			DeviceUtils.getDeviceManager().addListener(this);
		} catch (NameNotFoundException ex) {
			throw new PluginException(ex);
		}
	}

	/**
	 * Stop the plugin
	 * @throws PluginException
	 */
	protected void stopPlugin() throws org.jnode.plugin.PluginException {
		try {
			DeviceUtils.getDeviceManager().addListener(this);
		} catch (NameNotFoundException ex) {
			throw new PluginException(ex);
		}
	}

	/**
	 * @param device
	 * @see org.jnode.driver.DeviceListener#deviceStarted(org.jnode.driver.Device)
	 */
	public void deviceStarted(Device device) {
		if ((acpi == null) && device.implementsAPI(FirmwareAPI.class)) {
			try {
			acpi = new ACPI();
			this.fwDevice = device;
			} catch (ResourceNotFreeException ex) {
				log.error("Cannot start ACPI", ex);
			}
		}
	}

	/**
	 * @param device
	 * @see org.jnode.driver.DeviceListener#deviceStop(org.jnode.driver.Device)
	 */
	public void deviceStop(Device device) {
		if (device == fwDevice) {
			this.acpi.release();
			this.acpi = null;
			this.fwDevice = null;
		}
	}

}