On Fri, 15 Nov 2002, Thomas Nagel wrote:
> Hi, > > I guess more people than I had the problem to use log4j inside a > "non log4j enviroment" e.g. Caucho Resin. I'm not sure I understand why you need this plugin (apart from the reloading aspect). If you have log4j.jar in WEB-INF/lib and log4j.properties in WEB-INF/classes, it should just work. -- Martin Cooper > > I wrote a small Struts log4j PlugIn which might be useful to those > who do not want to reinvent the wheel ;-) > > The Plug-In is also able to reload configuration after a given sleep time, > because restarting the server on every property file change anoyed me. > > Use: > ---- > 1) put your log4j.properties in your /WEB-INF/ directory. > > 2) Add the following to your struts-config.xml > > <plug-in className="Log4jPlugIn" > > <!-- > sleep time, default to 2 minutes > sleep time of 0 means no background thread > --> > <set-property property="sleepTime" value="1200000" /> > > <!-- where to find the log4j.properties file --> > <set-property property="logProperties" > value="/WEB-INF/log4j.properties" /> > </plug-in> > > > 3) Compile the following and add to your /WEB-INF/classes > > - code --------------------------------------------------------- > > import java.io.File; > import javax.servlet.ServletException; > > import org.apache.log4j.PropertyConfigurator; > import org.apache.log4j.Logger; > > import org.apache.struts.action.PlugIn; > import org.apache.struts.config.ApplicationConfig; > import org.apache.struts.action.ActionServlet; > > /** > * Initializes the <a href="http://jakarta.apache.org/log4j";>log4j</a> > * system with a given log4j.properties file for non - Log4j enviroments, > * e.g. Caucho Resin. > * <p> > * This class also starts a background thread which checks the modification > * time of the property file periodically (sleepTime) and updates the > * system if necessary. > * <p> > * Default sleep time is 2 minutes, a sleep time of 0 simply means > * NO background thread. > * > * @author <a href="mailto:[EMAIL PROTECTED]";>Thomas Nagel</a> > * @version $Revision: 1.1 $ $Date: 2002/11/12 09:23:27 $ > */ > public final class Log4jPlugIn implements PlugIn { > > // ------------------------------------------------------- members > > /** Logger instance to use with this Plugin. */ > private Logger log; > > /** Path to find the log properties. */ > private String _logConfiguration; > > /** Which configuration file to use. */ > private File _logProperties; > > /** When was last time the logging properties where modified. */ > private long _lastChange; > > > /** > * The background thread which updates the log4j if the configuration > * file has changed. > */ > private ModificationWatcher _modificationWatcher; > > /** > * How long should the modification thread sleep until > * it reloads the configuration? Default to 2 minutes > * (120000 milliseconds). > */ > private long _sleepTime = 120000; > > > > // ------------------------------------------------------- constructor > > /** Creates a new instance of DatabasePlugIn */ > public Log4jPlugIn() {} > > > // ------------------------------------------------------- methods > > /** > * Initializes the Log4jPlugIn by configuring the log4j system > * with the given property file. > * > * @throws ServletException if initialization failes. > */ > public void init(ActionServlet servlet, > ApplicationConfig applicationConfig) throws > ServletException { > try{ > _logProperties = > new > File(servlet.getServletContext().getRealPath(getLogProperties())); > configureLog4j(); > log = Logger.getLogger(getClass().getName()); > > if(_sleepTime > 0 ){ > _modificationWatcher = new > Log4jPlugIn.ModificationWatcher(); > _modificationWatcher.start(); > } > }catch(Exception e){ > throw new ServletException("Could not initialize log4j > subsystem", e); > } > log.info("Log4j successfully initialized."); > } > > > /** > * Not used but required by interface. > */ > public void destroy() { > log.info("Shutting down log4j system."); > _modificationWatcher.shutdown(); > } > > > /** > * Configures the log4j system. > */ > private void configureLog4j() throws Exception { > PropertyConfigurator.configure(_logProperties.toURL()); > _lastChange = _logProperties.lastModified(); > } > > > // ------------------------------------------------------------ > properties > > public String getLogProperties() { > return _logConfiguration; > } > > public void setLogProperties(String logProperties) { > _logConfiguration = logProperties; > } > > public void setSleepTime(String sleepTime) { > _sleepTime = Long.parseLong(sleepTime); > } > > > // ---------------------------------------------------------- inner > classes > > /** > * Background check if the log4j configuration file > * has changed. > */ > private final class ModificationWatcher extends Thread { > > protected boolean _done = false; > > public void run(){ > while(!_done){ > if(_logProperties.lastModified() != _lastChange){ > try{ > configureLog4j(); > }catch(Exception e){ > log.error("Problems configuring log4j system", > e); > } > log.info("Configuring log4j system"); > } > > try{ > sleep(_sleepTime); > }catch(InterruptedException ex){} > } > } > > public void shutdown(){ > _done = true; > } > } > } > > - code --------------------------------------------------------- > > Bye > > Thomas > > -- > To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> > For additional commands, e-mail: <mailto:[EMAIL PROTECTED]> > > -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
