Source Code Cross Referenced for Loader.java in  » Sevlet-Container » tomcat-catalina » org » apache » catalina » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Sevlet Container » tomcat catalina » org.apache.catalina 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 1999,2004 The Apache Software Foundation.
003:         * 
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         * 
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         * 
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.apache.catalina;
018:
019:        import java.beans.PropertyChangeListener;
020:
021:        /**
022:         * A <b>Loader</b> represents a Java ClassLoader implementation that can
023:         * be used by a Container to load class files (within a repository associated
024:         * with the Loader) that are designed to be reloaded upon request, as well as
025:         * a mechanism to detect whether changes have occurred in the underlying
026:         * repository.
027:         * <p>
028:         * In order for a <code>Loader</code> implementation to successfully operate
029:         * with a <code>Context</code> implementation that implements reloading, it
030:         * must obey the following constraints:
031:         * <ul>
032:         * <li>Must implement <code>Lifecycle</code> so that the Context can indicate
033:         *     that a new class loader is required.
034:         * <li>The <code>start()</code> method must unconditionally create a new
035:         *     <code>ClassLoader</code> implementation.
036:         * <li>The <code>stop()</code> method must throw away its reference to the
037:         *     <code>ClassLoader</code> previously utilized, so that the class loader,
038:         *     all classes loaded by it, and all objects of those classes, can be
039:         *     garbage collected.
040:         * <li>Must allow a call to <code>stop()</code> to be followed by a call to
041:         *     <code>start()</code> on the same <code>Loader</code> instance.
042:         * <li>Based on a policy chosen by the implementation, must call the
043:         *     <code>Context.reload()</code> method on the owning <code>Context</code>
044:         *     when a change to one or more of the class files loaded by this class
045:         *     loader is detected.
046:         * </ul>
047:         *
048:         * @author Craig R. McClanahan
049:         * @version $Revision: 1.3 $ $Date: 2004/02/27 14:58:38 $
050:         */
051:
052:        public interface Loader {
053:
054:            // ------------------------------------------------------------- Properties
055:
056:            /**
057:             * Return the Java class loader to be used by this Container.
058:             */
059:            public ClassLoader getClassLoader();
060:
061:            /**
062:             * Return the Container with which this Loader has been associated.
063:             */
064:            public Container getContainer();
065:
066:            /**
067:             * Set the Container with which this Loader has been associated.
068:             *
069:             * @param container The associated Container
070:             */
071:            public void setContainer(Container container);
072:
073:            /**
074:             * Return the DefaultContext with which this Manager is associated.
075:             */
076:            public DefaultContext getDefaultContext();
077:
078:            /**
079:             * Set the DefaultContext with which this Manager is associated.
080:             *
081:             * @param defaultContext The newly associated DefaultContext
082:             */
083:            public void setDefaultContext(DefaultContext defaultContext);
084:
085:            /**
086:             * Return the "follow standard delegation model" flag used to configure
087:             * our ClassLoader.
088:             */
089:            public boolean getDelegate();
090:
091:            /**
092:             * Set the "follow standard delegation model" flag used to configure
093:             * our ClassLoader.
094:             *
095:             * @param delegate The new flag
096:             */
097:            public void setDelegate(boolean delegate);
098:
099:            /**
100:             * Return descriptive information about this Loader implementation and
101:             * the corresponding version number, in the format
102:             * <code>&lt;description&gt;/&lt;version&gt;</code>.
103:             */
104:            public String getInfo();
105:
106:            /**
107:             * Return the reloadable flag for this Loader.
108:             */
109:            public boolean getReloadable();
110:
111:            /**
112:             * Set the reloadable flag for this Loader.
113:             *
114:             * @param reloadable The new reloadable flag
115:             */
116:            public void setReloadable(boolean reloadable);
117:
118:            // --------------------------------------------------------- Public Methods
119:
120:            /**
121:             * Add a property change listener to this component.
122:             *
123:             * @param listener The listener to add
124:             */
125:            public void addPropertyChangeListener(
126:                    PropertyChangeListener listener);
127:
128:            /**
129:             * Add a new repository to the set of repositories for this class loader.
130:             *
131:             * @param repository Repository to be added
132:             */
133:            public void addRepository(String repository);
134:
135:            /**
136:             * Return the set of repositories defined for this class loader.
137:             * If none are defined, a zero-length array is returned.
138:             */
139:            public String[] findRepositories();
140:
141:            /**
142:             * Has the internal repository associated with this Loader been modified,
143:             * such that the loaded classes should be reloaded?
144:             */
145:            public boolean modified();
146:
147:            /**
148:             * Remove a property change listener from this component.
149:             *
150:             * @param listener The listener to remove
151:             */
152:            public void removePropertyChangeListener(
153:                    PropertyChangeListener listener);
154:
155:        }
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