Glassfish example source code file (Loader.java)

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Java - Glassfish tags/keywords

bean, classloader, classloader, container, container, defaultcontext, javabean, loader, loader, string, string

The Glassfish Loader.java source code

/*
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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 * permission notice:
 *
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.catalina;


import java.beans.PropertyChangeListener;


/**
 * A <b>Loader represents a Java ClassLoader implementation that can
 * be used by a Container to load class files (within a repository associated
 * with the Loader) that are designed to be reloaded upon request, as well as
 * a mechanism to detect whether changes have occurred in the underlying
 * repository.
 * <p>
 * In order for a <code>Loader implementation to successfully operate
 * with a <code>Context implementation that implements reloading, it
 * must obey the following constraints:
 * <ul>
 * <li>Must implement Lifecycle so that the Context can indicate
 *     that a new class loader is required.
 * <li>The start() method must unconditionally create a new
 *     <code>ClassLoader implementation.
 * <li>The stop() method must throw away its reference to the
 *     <code>ClassLoader previously utilized, so that the class loader,
 *     all classes loaded by it, and all objects of those classes, can be
 *     garbage collected.
 * <li>Must allow a call to stop() to be followed by a call to
 *     <code>start() on the same Loader instance.
 * <li>Based on a policy chosen by the implementation, must call the
 *     <code>Context.reload() method on the owning Context
 *     when a change to one or more of the class files loaded by this class
 *     loader is detected.
 * </ul>
 *
 * @author Craig R. McClanahan
 * @version $Revision: 1.3 $ $Date: 2005/12/08 01:27:18 $
 */

public interface Loader {


    // ------------------------------------------------------------- Properties


    /**
     * Return the Java class loader to be used by this Container.
     */
    public ClassLoader getClassLoader();


    /**
     * Return the Container with which this Loader has been associated.
     */
    public Container getContainer();


    /**
     * Set the Container with which this Loader has been associated.
     *
     * @param container The associated Container
     */
    public void setContainer(Container container);


    /**
     * Return the DefaultContext with which this Manager is associated.
     */
    public DefaultContext getDefaultContext();


    /**
     * Set the DefaultContext with which this Manager is associated.
     *
     * @param defaultContext The newly associated DefaultContext
     */
    public void setDefaultContext(DefaultContext defaultContext);
    
        
    
    /**
     * Return the "follow standard delegation model" flag used to configure
     * our ClassLoader.
     */
    public boolean getDelegate();


    /**
     * Set the "follow standard delegation model" flag used to configure
     * our ClassLoader.
     *
     * @param delegate The new flag
     */
    public void setDelegate(boolean delegate);


    /**
     * Return descriptive information about this Loader implementation and
     * the corresponding version number, in the format
     * <code><description>/<version>.
     */
    public String getInfo();


    /**
     * Return the reloadable flag for this Loader.
     */
    public boolean getReloadable();


    /**
     * Set the reloadable flag for this Loader.
     *
     * @param reloadable The new reloadable flag
     */
    public void setReloadable(boolean reloadable);


    // --------------------------------------------------------- Public Methods


    /**
     * Add a property change listener to this component.
     *
     * @param listener The listener to add
     */
    public void addPropertyChangeListener(PropertyChangeListener listener);


    /**
     * Add a new repository to the set of repositories for this class loader.
     *
     * @param repository Repository to be added
     */
    public void addRepository(String repository);


    /**
     * Return the set of repositories defined for this class loader.
     * If none are defined, a zero-length array is returned.
     */
    public String[] findRepositories();


    /**
     * Has the internal repository associated with this Loader been modified,
     * such that the loaded classes should be reloaded?
     */
    public boolean modified();


    /**
     * Remove a property change listener from this component.
     *
     * @param listener The listener to remove
     */
    public void removePropertyChangeListener(PropertyChangeListener listener);


    // START PE 4985680
    /**
     * Adds the given package name to the list of packages that may always be
     * overriden, regardless of whether they belong to a protected namespace
     */
    public void addOverridablePackage(String packageName);
    // END PE 4985680


    // START PWC 1.1 6314481
    public void setIgnoreHiddenJarFiles(boolean ignoreHiddenJarFiles);
    // END PWC 1.1 6314481
}