Source Code Cross Referenced for LibraryLoader.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » loader » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server resin 3.1.5 » resin » com.caucho.loader 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003:         *
004:         * This file is part of Resin(R) Open Source
005:         *
006:         * Each copy or derived work must preserve the copyright notice and this
007:         * notice unmodified.
008:         *
009:         * Resin Open Source is free software; you can redistribute it and/or modify
010:         * it under the terms of the GNU General Public License as published by
011:         * the Free Software Foundation; either version 2 of the License, or
012:         * (at your option) any later version.
013:         *
014:         * Resin Open Source is distributed in the hope that it will be useful,
015:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
016:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017:         * of NON-INFRINGEMENT.  See the GNU General Public License for more
018:         * details.
019:         *
020:         * You should have received a copy of the GNU General Public License
021:         * along with Resin Open Source; if not, write to the
022:         *   Free SoftwareFoundation, Inc.
023:         *   59 Temple Place, Suite 330
024:         *   Boston, MA 02111-1307  USA
025:         *
026:         * @author Scott Ferguson
027:         */
028:
029:        package com.caucho.loader;
030:
031:        import com.caucho.config.ConfigException;
032:        import com.caucho.config.types.FileSetType;
033:        import com.caucho.config.types.PathPatternType;
034:        import com.caucho.make.DependencyContainer;
035:        import com.caucho.server.util.CauchoSystem;
036:        import com.caucho.util.CharBuffer;
037:        import com.caucho.vfs.Depend;
038:        import com.caucho.vfs.Dependency;
039:        import com.caucho.vfs.JarPath;
040:        import com.caucho.vfs.Path;
041:
042:        import javax.annotation.PostConstruct;
043:        import java.net.URL;
044:        import java.util.*;
045:        import java.util.logging.Level;
046:        import java.util.logging.Logger;
047:        import java.io.*;
048:        import java.util.zip.*;
049:
050:        /**
051:         * Class loader which checks for changes in class files and automatically
052:         * picks up new jars.
053:         */
054:        public class LibraryLoader extends JarListLoader {
055:            private static final Logger log = Logger
056:                    .getLogger(LibraryLoader.class.getName());
057:
058:            // Configured path.
059:            private Path _path;
060:
061:            private FileSetType _fileSet;
062:
063:            // When the directory was last modified
064:            private long _lastModified;
065:
066:            private String[] _fileNames;
067:
068:            // list of the matching paths
069:            private ArrayList<Path> _pathList = new ArrayList<Path>();
070:
071:            // list of the matching paths
072:            private ArrayList<Path> _newPathList = new ArrayList<Path>();
073:
074:            /**
075:             * Creates a new directory loader.
076:             */
077:            public LibraryLoader() {
078:            }
079:
080:            /**
081:             * Creates a new directory loader.
082:             */
083:            public LibraryLoader(Path path) {
084:                _path = path;
085:
086:                try {
087:                    init();
088:                } catch (Exception e) {
089:                    throw new RuntimeException(e);
090:                }
091:            }
092:
093:            /**
094:             * The library loader's path.
095:             */
096:            public void setPath(Path path) {
097:                _path = path;
098:            }
099:
100:            /**
101:             * The library loader's path.
102:             */
103:            public Path getPath() {
104:                return _path;
105:            }
106:
107:            /**
108:             * Sets a file set.
109:             */
110:            public void setFileset(FileSetType fileSet) {
111:                _fileSet = fileSet;
112:            }
113:
114:            /**
115:             * Create a new class loader
116:             *
117:             * @param parent parent class loader
118:             * @param dir directories which can handle dynamic jar addition
119:             */
120:            public static DynamicClassLoader create(ClassLoader parent,
121:                    Path path) {
122:                DynamicClassLoader loader = new DynamicClassLoader(parent);
123:
124:                LibraryLoader dirLoader = new LibraryLoader(path);
125:
126:                loader.addLoader(dirLoader);
127:
128:                loader.init();
129:
130:                return loader;
131:            }
132:
133:            /**
134:             * Initialize
135:             */
136:            @PostConstruct
137:            @Override
138:            public void init() throws ConfigException {
139:                super .init();
140:
141:                try {
142:                    if (_fileSet != null) {
143:                    } else if (_path.getPath().endsWith(".jar")
144:                            || _path.getPath().endsWith(".zip")) {
145:                        _fileSet = new FileSetType();
146:                        _fileSet.setDir(_path.getParent());
147:                        _fileSet
148:                                .addInclude(new PathPatternType(_path.getTail()));
149:                    } else {
150:                        _fileSet = new FileSetType();
151:                        _fileSet.setDir(_path);
152:                        _fileSet.addInclude(new PathPatternType("*.jar"));
153:                        _fileSet.addInclude(new PathPatternType("*.zip"));
154:                    }
155:
156:                    fillJars();
157:                } catch (ConfigException e) {
158:                    throw e;
159:                } catch (Exception e) {
160:                    throw ConfigException.create(e);
161:                }
162:            }
163:
164:            /**
165:             * True if any of the loaded classes have been modified.  If true, the
166:             * caller should drop the classpath and create a new one.
167:             */
168:            public boolean isModified() {
169:                _newPathList.clear();
170:
171:                _fileSet.getPaths(_newPathList);
172:
173:                return !_newPathList.equals(_pathList);
174:            }
175:
176:            /**
177:             * True if the classes in the directory have changed.
178:             */
179:            public boolean logModified(Logger log) {
180:                if (isModified()) {
181:                    log.info(_path.getNativePath() + " has modified jar files");
182:                    return true;
183:                } else
184:                    return false;
185:            }
186:
187:            /**
188:             * Find all the jars in this directory and add them to jarList.
189:             */
190:            private void fillJars() {
191:                _pathList.clear();
192:                _jarList.clear();
193:
194:                _fileSet.getPaths(_pathList);
195:
196:                for (int i = 0; i < _pathList.size(); i++) {
197:                    Path jar = _pathList.get(i);
198:
199:                    addJar(jar);
200:                }
201:            }
202:
203:            public Path getCodePath() {
204:                return _fileSet.getDir();
205:            }
206:
207:            /**
208:             * Destroys the loader, closing the jars.
209:             */
210:            protected void destroy() {
211:                clearJars();
212:            }
213:
214:            public String toString() {
215:                return getClass().getSimpleName() + "[" + _fileSet + "]";
216:            }
217:        }
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