Source Code Cross Referenced for Loader.java in  » Web-Server » Rimfaxe-Web-Server » org » apache » catalina » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Server » Rimfaxe Web Server » org.apache.catalina 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Header: /home/cvs/jakarta-tomcat-4.0/catalina/src/share/org/apache/catalina/Loader.java,v 1.5 2001/07/22 20:13:30 pier Exp $
003:         * $Revision: 1.5 $
004:         * $Date: 2001/07/22 20:13:30 $
005:         *
006:         * ====================================================================
007:         *
008:         * The Apache Software License, Version 1.1
009:         *
010:         * Copyright (c) 1999 The Apache Software Foundation.  All rights
011:         * reserved.
012:         *
013:         * Redistribution and use in source and binary forms, with or without
014:         * modification, are permitted provided that the following conditions
015:         * are met:
016:         *
017:         * 1. Redistributions of source code must retain the above copyright
018:         *    notice, this list of conditions and the following disclaimer.
019:         *
020:         * 2. Redistributions in binary form must reproduce the above copyright
021:         *    notice, this list of conditions and the following disclaimer in
022:         *    the documentation and/or other materials provided with the
023:         *    distribution.
024:         *
025:         * 3. The end-user documentation included with the redistribution, if
026:         *    any, must include the following acknowlegement:
027:         *       "This product includes software developed by the
028:         *        Apache Software Foundation (http://www.apache.org/)."
029:         *    Alternately, this acknowlegement may appear in the software itself,
030:         *    if and wherever such third-party acknowlegements normally appear.
031:         *
032:         * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
033:         *    Foundation" must not be used to endorse or promote products derived
034:         *    from this software without prior written permission. For written
035:         *    permission, please contact apache@apache.org.
036:         *
037:         * 5. Products derived from this software may not be called "Apache"
038:         *    nor may "Apache" appear in their names without prior written
039:         *    permission of the Apache Group.
040:         *
041:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
042:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
043:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
044:         * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
045:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
046:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
047:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
048:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
049:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
050:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
051:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
052:         * SUCH DAMAGE.
053:         * ====================================================================
054:         *
055:         * This software consists of voluntary contributions made by many
056:         * individuals on behalf of the Apache Software Foundation.  For more
057:         * information on the Apache Software Foundation, please see
058:         * <http://www.apache.org/>.
059:         *
060:         * [Additional notices, if required by prior licensing conditions]
061:         *
062:         */
063:
064:        package org.apache.catalina;
065:
066:        import java.beans.PropertyChangeListener;
067:
068:        /**
069:         * A <b>Loader</b> represents a Java ClassLoader implementation that can
070:         * be used by a Container to load class files (within a repository associated
071:         * with the Loader) that are designed to be reloaded upon request, as well as
072:         * a mechanism to detect whether changes have occurred in the underlying
073:         * repository.
074:         * <p>
075:         * In order for a <code>Loader</code> implementation to successfully operate
076:         * with a <code>Context</code> implementation that implements reloading, it
077:         * must obey the following constraints:
078:         * <ul>
079:         * <li>Must implement <code>Lifecycle</code> so that the Context can indicate
080:         *     that a new class loader is required.
081:         * <li>The <code>start()</code> method must unconditionally create a new
082:         *     <code>ClassLoader</code> implementation.
083:         * <li>The <code>stop()</code> method must throw away its reference to the
084:         *     <code>ClassLoader</code> previously utilized, so that the class loader,
085:         *     all classes loaded by it, and all objects of those classes, can be
086:         *     garbage collected.
087:         * <li>Must allow a call to <code>stop()</code> to be followed by a call to
088:         *     <code>start()</code> on the same <code>Loader</code> instance.
089:         * <li>Based on a policy chosen by the implementation, must call the
090:         *     <code>Context.reload()</code> method on the owning <code>Context</code>
091:         *     when a change to one or more of the class files loaded by this class
092:         *     loader is detected.
093:         * </ul>
094:         *
095:         * @author Craig R. McClanahan
096:         * @version $Revision: 1.5 $ $Date: 2001/07/22 20:13:30 $
097:         */
098:
099:        public interface Loader {
100:
101:            // ------------------------------------------------------------- Properties
102:
103:            /**
104:             * Return the Java class loader to be used by this Container.
105:             */
106:            public ClassLoader getClassLoader();
107:
108:            /**
109:             * Return the Container with which this Loader has been associated.
110:             */
111:            public Container getContainer();
112:
113:            /**
114:             * Set the Container with which this Loader has been associated.
115:             *
116:             * @param container The associated Container
117:             */
118:            public void setContainer(Container container);
119:
120:            /**
121:             * Return the "follow standard delegation model" flag used to configure
122:             * our ClassLoader.
123:             */
124:            public boolean getDelegate();
125:
126:            /**
127:             * Set the "follow standard delegation model" flag used to configure
128:             * our ClassLoader.
129:             *
130:             * @param delegate The new flag
131:             */
132:            public void setDelegate(boolean delegate);
133:
134:            /**
135:             * Return descriptive information about this Loader implementation and
136:             * the corresponding version number, in the format
137:             * <code>&lt;description&gt;/&lt;version&gt;</code>.
138:             */
139:            public String getInfo();
140:
141:            /**
142:             * Return the reloadable flag for this Loader.
143:             */
144:            public boolean getReloadable();
145:
146:            /**
147:             * Set the reloadable flag for this Loader.
148:             *
149:             * @param reloadable The new reloadable flag
150:             */
151:            public void setReloadable(boolean reloadable);
152:
153:            // --------------------------------------------------------- Public Methods
154:
155:            /**
156:             * Add a property change listener to this component.
157:             *
158:             * @param listener The listener to add
159:             */
160:            public void addPropertyChangeListener(
161:                    PropertyChangeListener listener);
162:
163:            /**
164:             * Add a new repository to the set of repositories for this class loader.
165:             *
166:             * @param repository Repository to be added
167:             */
168:            public void addRepository(String repository);
169:
170:            /**
171:             * Return the set of repositories defined for this class loader.
172:             * If none are defined, a zero-length array is returned.
173:             */
174:            public String[] findRepositories();
175:
176:            /**
177:             * Has the internal repository associated with this Loader been modified,
178:             * such that the loaded classes should be reloaded?
179:             */
180:            public boolean modified();
181:
182:            /**
183:             * Remove a property change listener from this component.
184:             *
185:             * @param listener The listener to remove
186:             */
187:            public void removePropertyChangeListener(
188:                    PropertyChangeListener listener);
189:
190:        }
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