environment.java

来自「RESIN 3.2 最新源码」· Java 代码 · 共 711 行 · 第 1/2 页

/*
 * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.loader;

import com.caucho.lifecycle.StartLifecycleException;
import com.caucho.server.util.CauchoSystem;
import com.caucho.vfs.Depend;
import com.caucho.vfs.Dependency;
import com.caucho.vfs.Path;

import java.security.Permission;
import java.util.ArrayList;

/**
 * Static utility classes.
 */
public class Environment {
  private static ArrayList<EnvironmentListener> _globalEnvironmentListeners =
    new ArrayList<EnvironmentListener>();
  
  private static ArrayList<ClassLoaderListener> _globalLoaderListeners =
    new ArrayList<ClassLoaderListener>();
  
  /**
   * Returns the local environment.
   */
  public static EnvironmentClassLoader getEnvironmentClassLoader()
  {
    ClassLoader loader = Thread.currentThread().getContextClassLoader();
    
    for (; loader != null; loader = loader.getParent()) {
      if (loader instanceof EnvironmentClassLoader)
        return (EnvironmentClassLoader) loader;
    }

    return null;
  }
  
  /**
   * Returns the local environment.
   */
  public static EnvironmentClassLoader
    getEnvironmentClassLoader(ClassLoader loader)
  {
    for (; loader != null; loader = loader.getParent()) {
      if (loader instanceof EnvironmentClassLoader)
        return (EnvironmentClassLoader) loader;
    }

    return null;
  }
  
  /**
   * Add listener.
   *
   * @param listener object to listen for environment start/stop
   */
  public static void addEnvironmentListener(EnvironmentListener listener)
  {
    ClassLoader loader = Thread.currentThread().getContextClassLoader();

    addEnvironmentListener(listener, loader);
  }
  
  /**
   * Add listener.
   *
   * @param listener object to listen for environment create/destroy
   * @param loader the context class loader
   */
  public static void addEnvironmentListener(EnvironmentListener listener,
					    ClassLoader loader)
  {
    for (; loader != null; loader = loader.getParent()) {
      if (loader instanceof EnvironmentClassLoader) {
        ((EnvironmentClassLoader) loader).addListener(listener);
        return;
      }
    }

    _globalEnvironmentListeners.add(listener);
  }
  
  /**
   * Remove listener.
   *
   * @param listener object to listen for environment start/stop
   */
  public static void removeEnvironmentListener(EnvironmentListener listener)
  {
    ClassLoader loader = Thread.currentThread().getContextClassLoader();

    removeEnvironmentListener(listener, loader);
  }
  
  /**
   * Remove listener.
   *
   * @param listener object to listen for environment create/destroy
   * @param loader the context class loader
   */
  public static void removeEnvironmentListener(EnvironmentListener listener,
					    ClassLoader loader)
  {
    for (; loader != null; loader = loader.getParent()) {
      if (loader instanceof EnvironmentClassLoader) {
        ((EnvironmentClassLoader) loader).removeListener(listener);
        return;
      }
    }

    _globalEnvironmentListeners.remove(listener);
  }
  
  /**
   * Add listener.
   *
   * @param listener object to listen for environment create/destroy
   * @param loader the context class loader
   */
  public static void addChildEnvironmentListener(EnvironmentListener listener)
  {
    ClassLoader loader = Thread.currentThread().getContextClassLoader();
    
    addChildEnvironmentListener(listener, loader);
  }
  
  /**
   * Add listener.
   *
   * @param listener object to listen for environment create/destroy
   * @param loader the context class loader
   */
  public static void addChildEnvironmentListener(EnvironmentListener listener,
						 ClassLoader loader)
  {
    for (; loader != null; loader = loader.getParent()) {
      if (loader instanceof EnvironmentClassLoader) {
        ((EnvironmentClassLoader) loader).addChildListener(listener);
        return;
      }
    }
  }
  
  /**
   * Add listener.
   *
   * @param listener object to listen for environment create/destroy
   * @param loader the context class loader
   */
  public static void addChildLoaderListener(AddLoaderListener listener)
  {
    ClassLoader loader = Thread.currentThread().getContextClassLoader();
    
    addChildLoaderListener(listener, loader);
  }
  
  /**
   * Add listener.
   *
   * @param listener object to listen for environment create/destroy
   * @param loader the context class loader
   */
  public static void addChildLoaderListener(AddLoaderListener listener,
					    ClassLoader loader)
  {
    for (; loader != null; loader = loader.getParent()) {
      if (loader instanceof EnvironmentClassLoader) {
        ((EnvironmentClassLoader) loader).addLoaderListener(listener);
        return;
      }
    }
  }
  
  /**
   * Add listener.
   *
   * @param listener object to listen for environment create/destroy
   */
  public static void addClassLoaderListener(ClassLoaderListener listener)
  {
    ClassLoader loader = Thread.currentThread().getContextClassLoader();

    addClassLoaderListener(listener, loader);
  }
  
  /**
   * Add listener.
   *
   * @param listener object to listen for environment create/destroy
   * @param loader the context class loader
   */
  public static void addClassLoaderListener(ClassLoaderListener listener,
                                            ClassLoader loader)
  {
    for (; loader != null; loader = loader.getParent()) {
      if (loader instanceof EnvironmentClassLoader) {
        ((EnvironmentClassLoader) loader).addListener(listener);
        return;
      }
    }

    _globalLoaderListeners.add(listener);
  }
  
  /**
   * Add close listener.
   *
   * @param listener object to listen for environment create/destroy
   * @param loader the context class loader
   */
  public static void addCloseListener(Object obj)
  {
    addClassLoaderListener(new CloseListener(obj));
  }

  /**
   * Starts the current environment.
   */
  public static void init()
  {
    init(Thread.currentThread().getContextClassLoader());
  }

  /**
   * Starts the current environment.
   */
  public static void init(ClassLoader loader)
  {
    for (; loader != null; loader = loader.getParent()) {
      if (loader instanceof EnvironmentClassLoader) {
        ((EnvironmentClassLoader) loader).init();
        return;
      }
    }

    for (int i = 0; i < _globalLoaderListeners.size(); i++) {
      ClassLoaderListener listener = _globalLoaderListeners.get(i);

      listener.classLoaderInit(null);
    }
  }

  /**
   * Starts the current environment.
   */
  public static void start()
    throws StartLifecycleException
  {
    start(Thread.currentThread().getContextClassLoader());
  }

  /**
   * Starts the current environment.
   */
  public static void start(ClassLoader loader)
    throws StartLifecycleException
  {
    for (; loader != null; loader = loader.getParent()) {
      if (loader instanceof EnvironmentClassLoader) {
        ((EnvironmentClassLoader) loader).start();
        return;
      }
    }

    init(loader);
    
    for (int i = 0; i < _globalEnvironmentListeners.size(); i++) {
      EnvironmentListener listener = _globalEnvironmentListeners.get(i);

      listener.environmentStart(null);
    }
  }

  /**
   * Starts the current environment.
   */
  public static void stop()
  {
    stop(Thread.currentThread().getContextClassLoader());
  }

  /**
   * Starts the current environment.
   */
  public static void stop(ClassLoader loader)
  {
    for (; loader != null; loader = loader.getParent()) {
      if (loader instanceof EnvironmentClassLoader) {
        ((EnvironmentClassLoader) loader).stop();
        return;
      }
    }

    ArrayList<EnvironmentListener> listeners;
    listeners = new ArrayList<EnvironmentListener>();
    listeners.addAll(_globalEnvironmentListeners);
    _globalEnvironmentListeners.clear();
    
    for (int i = 0; i < listeners.size(); i++) {
      EnvironmentListener listener = listeners.get(i);

      listener.environmentStop(null);
    }
  }
  
  /**
   * Adds a dependency to the current environment.
   *
   * @param depend the dependency to add
   */
  public static void addDependency(Dependency depend)
  {
    ClassLoader loader = Thread.currentThread().getContextClassLoader();

    addDependency(depend, loader);
  }

  /**
   * Adds a dependency to the current environment.
   *
   * @param depend the dependency to add
   * @param loader the context loader
   */
  public static void addDependency(Dependency depend,
                                   ClassLoader loader)
  {
    for (; loader != null; loader = loader.getParent()) {
      if (loader instanceof EnvironmentClassLoader) {