Source Code Cross Referenced for ResourceFileMonitor.java in  » Web-Framework » jpublish » com » anthonyeden » lib » resource » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » jpublish » com.anthonyeden.lib.resource 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*-- 
002:
003:         Copyright (C) 2000-2003 Anthony Eden.
004:         All rights reserved.
005:         
006:         Redistribution and use in source and binary forms, with or without
007:         modification, are permitted provided that the following conditions
008:         are met:
009:         
010:         1. Redistributions of source code must retain the above copyright
011:            notice, this list of conditions, and the following disclaimer.
012:         
013:         2. Redistributions in binary form must reproduce the above copyright
014:            notice, this list of conditions, and the disclaimer that follows 
015:            these conditions in the documentation and/or other materials 
016:            provided with the distribution.
017:
018:         3. The name "EdenLib" must not be used to endorse or promote products
019:            derived from this software without prior written permission.  For
020:            written permission, please contact me@anthonyeden.com.
021:         
022:         4. Products derived from this software may not be called "EdenLib", nor
023:            may "EdenLib" appear in their name, without prior written permission
024:            from Anthony Eden (me@anthonyeden.com).
025:         
026:         In addition, I request (but do not require) that you include in the 
027:         end-user documentation provided with the redistribution and/or in the 
028:         software itself an acknowledgement equivalent to the following:
029:             "This product includes software developed by
030:              Anthony Eden (http://www.anthonyeden.com/)."
031:
032:         THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
033:         WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
034:         OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
035:         DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, 
036:         INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
037:         (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
038:         SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
039:         HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
040:         STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
041:         IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
042:         POSSIBILITY OF SUCH DAMAGE.
043:         For more information on EdenLib, please see <http://edenlib.sf.net/>.
044:         
045:         */
046:
047:        package com.anthonyeden.lib.resource;
048:
049:        import java.io.File;
050:        import java.io.FileInputStream;
051:
052:        import org.apache.commons.logging.Log;
053:        import org.apache.commons.logging.LogFactory;
054:
055:        import com.anthonyeden.lib.util.IOUtilities;
056:
057:        /** Monitors the given File for changes.
058:
059:         @author Anthony Eden
060:         */
061:
062:        public class ResourceFileMonitor implements  Runnable, ResourceMonitor {
063:
064:            private static final Log log = LogFactory
065:                    .getLog(ResourceFileMonitor.class);
066:
067:            private File file;
068:            private int delay;
069:            private long lastModified;
070:            private ResourceRecipient handler;
071:
072:            private Thread thread;
073:            private boolean running = false;
074:
075:            /** Construct a ResourceFileMonitor for the given file.
076:            
077:                @param file The file
078:                @param delay The delay
079:                @param handler The handler
080:            ?*/
081:
082:            public ResourceFileMonitor(File file, int delay,
083:                    ResourceRecipient handler) {
084:                this .file = file;
085:                this .delay = delay;
086:                this .handler = handler;
087:            }
088:
089:            /** Start the monitoring thread.  If the thread is already running then 
090:                this method will not attempt to start a new thread.
091:             */
092:
093:            public void startMonitor() {
094:                if (!running) {
095:                    log.debug("Starting FileMonitor");
096:
097:                    running = true;
098:                    thread = new Thread(this );
099:                    thread.setDaemon(true);
100:                    thread.start();
101:                }
102:            }
103:
104:            /** Stop the monitoring thread.  If the monitoring thread is not running
105:                then this method will do nothing.
106:             */
107:
108:            public void stopMonitor() {
109:                if (thread != null && running) {
110:                    log.debug("Stopping FileMonitor");
111:
112:                    running = false;
113:                    thread.interrupt();
114:                }
115:            }
116:
117:            /** The thread's run method.  This method should not be executed directly
118:                nor should a thread be manually created, rather the <code>startMonitor()</code>
119:                and <code>stopMonitor()</code> methods should be used to start and stop 
120:                the monitor.
121:             */
122:
123:            public void run() {
124:                log.debug("FileMonitor start.");
125:                lastModified = file.lastModified();
126:                while (running) {
127:                    long currentLastModified = file.lastModified();
128:                    if (currentLastModified != lastModified) {
129:                        log.info("Reloading " + file);
130:
131:                        FileInputStream in = null;
132:                        try {
133:                            in = new FileInputStream(file);
134:                            handler.load(in);
135:                        } catch (Exception e) {
136:                            e.printStackTrace();
137:                        } finally {
138:                            IOUtilities.close(in);
139:                        }
140:
141:                        lastModified = currentLastModified;
142:                    }
143:
144:                    try {
145:                        Thread.sleep(delay);
146:                    } catch (InterruptedException e) {
147:                        // do nothing
148:                    }
149:                }
150:                log.debug("FileMonitor stopped.");
151:            }
152:
153:        }
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