container.java

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/*
 * $Header: /home/cvs/jakarta-tomcat-catalina/catalina/src/share/org/apache/catalina/Container.java,v 1.6 2003/07/18 18:48:58 remm Exp $
 * $Revision: 1.6 $
 * $Date: 2003/07/18 18:48:58 $
 *
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache"
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 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */


package org.apache.catalina;


import java.beans.PropertyChangeListener;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.naming.directory.DirContext;


/**
 * A <b>Container</b> is an object that can execute requests received from
 * a client, and return responses based on those requests.  A Container may
 * optionally support a pipeline of Valves that process the request in an
 * order configured at runtime, by implementing the <b>Pipeline</b> interface
 * as well.
 * <p>
 * Containers will exist at several conceptual levels within Catalina.  The
 * following examples represent common cases:
 * <ul>
 * <li><b>Engine</b> - Representation of the entire Catalina servlet engine,
 *     most likely containing one or more subcontainers that are either Host
 *     or Context implementations, or other custom groups.
 * <li><b>Host</b> - Representation of a virtual host containing a number
 *     of Contexts.
 * <li><b>Context</b> - Representation of a single ServletContext, which will
 *     typically contain one or more Wrappers for the supported servlets.
 * <li><b>Wrapper</b> - Representation of an individual servlet definition
 *     (which may support multiple servlet instances if the servlet itself
 *     implements SingleThreadModel).
 * </ul>
 * A given deployment of Catalina need not include Containers at all of the
 * levels described above.  For example, an administration application
 * embedded within a network device (such as a router) might only contain
 * a single Context and a few Wrappers, or even a single Wrapper if the
 * application is relatively small.  Therefore, Container implementations
 * need to be designed so that they will operate correctly in the absence
 * of parent Containers in a given deployment.
 * <p>
 * A Container may also be associated with a number of support components
 * that provide functionality which might be shared (by attaching it to a
 * parent Container) or individually customized.  The following support
 * components are currently recognized:
 * <ul>
 * <li><b>Loader</b> - Class loader to use for integrating new Java classes
 *     for this Container into the JVM in which Catalina is running.
 * <li><b>Logger</b> - Implementation of the <code>log()</code> method
 *     signatures of the <code>ServletContext</code> interface.
 * <li><b>Manager</b> - Manager for the pool of Sessions associated with
 *     this Container.
 * <li><b>Realm</b> - Read-only interface to a security domain, for
 *     authenticating user identities and their corresponding roles.
 * <li><b>Resources</b> - JNDI directory context enabling access to static
 *     resources, enabling custom linkages to existing server components when
 *     Catalina is embedded in a larger server.
 * </ul>
 *
 * @author Craig R. McClanahan
 * @author Remy Maucherat
 * @version $Revision: 1.6 $ $Date: 2003/07/18 18:48:58 $
 */

public interface Container {


    // ----------------------------------------------------- Manifest Constants


    /**
     * The ContainerEvent event type sent when a child container is added
     * by <code>addChild()</code>.
     */
    public static final String ADD_CHILD_EVENT = "addChild";


    /**
     * The ContainerEvent event type sent when a Mapper is added
     * by <code>addMapper()</code>.
     */
    public static final String ADD_MAPPER_EVENT = "addMapper";


    /**
     * The ContainerEvent event type sent when a valve is added
     * by <code>addValve()</code>, if this Container supports pipelines.
     */
    public static final String ADD_VALVE_EVENT = "addValve";


    /**
     * The ContainerEvent event type sent when a child container is removed
     * by <code>removeChild()</code>.
     */
    public static final String REMOVE_CHILD_EVENT = "removeChild";


    /**
     * The ContainerEvent event type sent when a Mapper is removed
     * by <code>removeMapper()</code>.
     */
    public static final String REMOVE_MAPPER_EVENT = "removeMapper";


    /**
     * The ContainerEvent event type sent when a valve is removed
     * by <code>removeValve()</code>, if this Container supports pipelines.
     */
    public static final String REMOVE_VALVE_EVENT = "removeValve";


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


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


    /**
     * Return the Loader with which this Container is associated.  If there is
     * no associated Loader, return the Loader associated with our parent
     * Container (if any); otherwise, return <code>null</code>.
     */
    public Loader getLoader();


    /**
     * Set the Loader with which this Container is associated.
     *
     * @param loader The newly associated loader
     */
    public void setLoader(Loader loader);


    /**
     * Return the Logger with which this Container is associated.  If there is
     * no associated Logger, return the Logger associated with our parent
     * Container (if any); otherwise return <code>null</code>.
     */
    public Logger getLogger();


    /**
     * Set the Logger with which this Container is associated.
     *
     * @param logger The newly associated Logger
     */
    public void setLogger(Logger logger);


    /**
     * Return the Manager with which this Container is associated.  If there is
     * no associated Manager, return the Manager associated with our parent
     * Container (if any); otherwise return <code>null</code>.
     */
    public Manager getManager();


    /**
     * Set the Manager with which this Container is associated.
     *
     * @param manager The newly associated Manager
     */
    public void setManager(Manager manager);


    /**
     * Return an object which may be utilized for mapping to this component.
     */
    public Object getMappingObject();


    /**
     * Return the Pipeline object that manages the Valves associated with
     * this Container.
     */
    public Pipeline getPipeline();