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package org.apache.catalina.logger;
import java.beans.PropertyChangeSupport;
import java.beans.PropertyChangeListener;
import java.io.CharArrayWriter;
import java.io.PrintWriter;
import java.util.Set;
import javax.servlet.ServletException;
import javax.management.ObjectName;
import javax.management.MBeanServer;
import javax.management.MBeanRegistration;
import org.apache.catalina.Container;
import org.apache.catalina.Logger;
import org.apache.catalina.Lifecycle;
import org.apache.catalina.LifecycleEvent;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.LifecycleListener;
import org.apache.catalina.core.StandardEngine;
import org.apache.catalina.core.StandardHost;
import org.apache.catalina.core.StandardContext;
import org.apache.catalina.util.LifecycleSupport;
import com.sun.org.apache.commons.logging.Log;
import com.sun.org.apache.commons.logging.LogFactory;
import com.sun.org.apache.commons.modeler.Registry;
/**
* Convenience base class for <b>Logger</b> implementations. The only
* method that must be implemented is <code>log(String msg)</code>, plus
* any property setting and lifecycle methods required for configuration.
*
* @author Craig R. McClanahan
* @version $Revision: 1.5 $ $Date: 2007/05/05 05:32:09 $
*/
public class LoggerBase
implements Lifecycle, Logger, MBeanRegistration
{
private static Log log = LogFactory.getLog(LoggerBase.class);
// ----------------------------------------------------- Instance Variables
/**
* The Container with which this Logger has been associated.
*/
protected Container container = null;
/**
* The debugging detail level for this component.
*/
protected int debug = 0;
/**
* The descriptive information about this implementation.
*/
protected static final String info =
"org.apache.catalina.logger.LoggerBase/1.0";
/**
* The lifecycle event support for this component.
*/
protected LifecycleSupport lifecycle = new LifecycleSupport(this);
/**
* The property change support for this component.
*/
protected PropertyChangeSupport support = new PropertyChangeSupport(this);
/**
* The verbosity level for above which log messages may be filtered.
*/
protected int verbosity = ERROR;
// ------------------------------------------------------------- Properties
/**
* Return the Container with which this Logger has been associated.
*/
public Container getContainer() {
return (container);
}
/**
* Set the Container with which this Logger has been associated.
*
* @param container The associated Container
*/
public void setContainer(Container container) {
Container oldContainer = this.container;
this.container = container;
support.firePropertyChange("container", oldContainer, this.container);
}
/**
* Return the debugging detail level for this component.
*/
public int getDebug() {
return (this.debug);
}
/**
* Set the debugging detail level for this component.
*
* @param debug The new debugging detail level
*/
public void setDebug(int debug) {
this.debug = debug;
}
/**
* Return descriptive information about this Logger implementation and
* the corresponding version number, in the format
* <code><description>/<version></code>.
*/
public String getInfo() {
return (info);
}
/**
* Return the verbosity level of this logger. Messages logged with a
* higher verbosity than this level will be silently ignored.
*/
public int getVerbosity() {
return (this.verbosity);
}
/**
* Set the verbosity level of this logger. Messages logged with a
* higher verbosity than this level will be silently ignored.
*
* @param verbosity The new verbosity level
*/
public void setVerbosity(int verbosity) {
this.verbosity = verbosity;
}
/**
* Set the verbosity level of this logger. Messages logged with a
* higher verbosity than this level will be silently ignored.
*
* @param verbosityLevel The new verbosity level, as a string
*/
public void setVerbosityLevel(String verbosity) {
if ("FATAL".equalsIgnoreCase(verbosity))
this.verbosity = FATAL;
else if ("ERROR".equalsIgnoreCase(verbosity))
this.verbosity = ERROR;
else if ("WARNING".equalsIgnoreCase(verbosity))
this.verbosity = WARNING;
else if ("INFORMATION".equalsIgnoreCase(verbosity))
this.verbosity = INFORMATION;
else if ("DEBUG".equalsIgnoreCase(verbosity))
this.verbosity = DEBUG;
}
// --------------------------------------------------------- Public Methods
/**
* Add a property change listener to this component.
*
* @param listener The listener to add
*/
public void addPropertyChangeListener(PropertyChangeListener listener) {
support.addPropertyChangeListener(listener);
}
/**
* Writes the specified message to a servlet log file, usually an event
* log. The name and type of the servlet log is specific to the
* servlet container. This message will be logged unconditionally.
*
* @param message A <code>String</code> specifying the message to be
* written to the log file
*/
public void log(String msg) {
log.debug(msg);
}
/**
* Writes the specified exception, and message, to a servlet log file.
* The implementation of this method should call
* <code>log(msg, exception)</code> instead. This method is deprecated
* in the ServletContext interface, but not deprecated here to avoid
* many useless compiler warnings. This message will be logged
* unconditionally.
*
* @param exception An <code>Exception</code> to be reported
* @param msg The associated message string
*/
public void log(Exception exception, String msg) {
log(msg, exception);
}
/**
* Writes an explanatory message and a stack trace for a given
* <code>Throwable</code> exception to the servlet log file. The name
* and type of the servlet log file is specific to the servlet container,
* usually an event log. This message will be logged unconditionally.
*
* @param msg A <code>String</code> that describes the error or
* exception
* @param throwable The <code>Throwable</code> error or exception
*/
public void log(String msg, Throwable throwable) {
CharArrayWriter buf = new CharArrayWriter();
PrintWriter writer = new PrintWriter(buf);
writer.println(msg);
throwable.printStackTrace(writer);
Throwable rootCause = null;
if (throwable instanceof LifecycleException)
rootCause = ((LifecycleException) throwable).getThrowable();
else if (throwable instanceof ServletException)
rootCause = ((ServletException) throwable).getRootCause();
if (rootCause != null) {
writer.println("----- Root Cause -----");
rootCause.printStackTrace(writer);
}
log(buf.toString());
}
/**
* Writes the specified message to the servlet log file, usually an event
* log, if the logger is set to a verbosity level equal to or higher than
* the specified value for this message.
*
* @param message A <code>String</code> specifying the message to be
* written to the log file
* @param verbosity Verbosity level of this message
*/
public void log(String message, int verbosity) {
if (this.verbosity >= verbosity)
log(message);
}
/**
* Writes the specified message and exception to the servlet log file,
* usually an event log, if the logger is set to a verbosity level equal
* to or higher than the specified value for this message.
*
* @param message A <code>String</code> that describes the error or
* exception
* @param throwable The <code>Throwable</code> error or exception
* @param verbosity Verbosity level of this message
*/
public void log(String message, Throwable throwable, int verbosity) {
if (this.verbosity >= verbosity)
log(message, throwable);
}
/**
* Remove a property change listener from this component.
*
* @param listener The listener to remove
*/
public void removePropertyChangeListener(PropertyChangeListener listener) {
support.removePropertyChangeListener(listener);
}
protected String domain;
protected String host;
protected String path;
protected ObjectName oname;
protected ObjectName controller;
protected MBeanServer mserver;
public ObjectName getController() {
return controller;
}
public void setController(ObjectName controller) {
this.controller = controller;
}
public ObjectName getObjectName() {
return oname;
}
public String getDomain() {
return domain;
}
public ObjectName preRegister(MBeanServer server,
ObjectName name) throws Exception {
oname=name;
mserver=server;
// FIXME null pointer exception
if (name == null) {
return null;
}
domain=name.getDomain();
host=name.getKeyProperty("host");
path=name.getKeyProperty("path");
log("preRegister with "+name);
if( container== null ) {
// Register with the parent
try {
ObjectName cname=null;
if( host == null ) {
// global
cname=new ObjectName(domain +":type=Engine");
} else if( path==null ) {
cname=new ObjectName(domain +
":type=Host,host=" + host);
} else {
cname=new ObjectName(domain +":j2eeType=WebModule,name=//" +
host + "/" + path);
}
log.debug("Register with " + cname);
mserver.invoke(cname, "setLogger", new Object[] {this},
new String[] {"org.apache.catalina.Logger"});
} catch (Exception e) {
e.printStackTrace(); //To change body of catch statement use Options | File Templates.
}
}
return name;
}
public void postRegister(Boolean registrationDone) {
}
public void preDeregister() throws Exception {
}
public void postDeregister() {
}
public void init() {
}
public void destroy() {
}
public ObjectName createObjectName() {
log("createObjectName with "+container);
// register
try {
StandardEngine engine=null;
String suffix="";
if( container instanceof StandardEngine ) {
engine=(StandardEngine)container;
} else if( container instanceof StandardHost ) {
engine=(StandardEngine)container.getParent();
suffix=",host=" + container.getName();
} else if( container instanceof StandardContext ) {
String path = ((StandardContext)container).getPath();
// add "/" to avoid MalformedObjectName Exception
if (path.equals("")) {
path = "/";
}
engine=(StandardEngine)container.getParent().getParent();
suffix= ",path=" + path + ",host=" +
container.getParent().getName();
} else {
log.error("Unknown container " + container );
}
if( engine != null ) {
oname=new ObjectName(engine.getDomain()+ ":type=Logger" + suffix);
} else {
log.error("Null engine !! " + container);
}
} catch (Throwable e) {
e.printStackTrace(); //To change body of catch statement use Options | File Templates.
}
return oname;
}
// ------------------------------------------------------ Lifecycle Methods
/**
* Add a lifecycle event listener to this component.
*
* @param listener The listener to add
*/
public void addLifecycleListener(LifecycleListener listener) {
lifecycle.addLifecycleListener(listener);
}
/**
* Get the lifecycle listeners associated with this lifecycle. If this
* Lifecycle has no listeners registered, a zero-length array is returned.
*/
public LifecycleListener[] findLifecycleListeners() {
return lifecycle.findLifecycleListeners();
}
/**
* Remove a lifecycle event listener from this component.
*
* @param listener The listener to add
*/
public void removeLifecycleListener(LifecycleListener listener) {
lifecycle.removeLifecycleListener(listener);
}
/**
* Prepare for the beginning of active use of the public methods of this
* component. This method should be called after <code>configure()</code>,
* and before any of the public methods of the component are utilized.
*
* @exception LifecycleException if this component detects a fatal error
* that prevents this component from being used
*/
public void start() throws LifecycleException {
// register this logger
if ( getObjectName()==null ) {
ObjectName oname = createObjectName();
try {
Registry.getRegistry().registerComponent(this, oname, null);
if (log.isDebugEnabled()) {
log.debug("Registering logger " + oname);
}
} catch( Exception ex ) {
log.error( "Can't register logger " + oname, ex);
}
}
}
/**
* Gracefully terminate the active use of the public methods of this
* component. This method should be the last one called on a given
* instance of this component.
*
* @exception LifecycleException if this component detects a fatal error
* that needs to be reported
*/
public void stop() throws LifecycleException {
// unregister this logger
if ( getObjectName()!=null ) {
ObjectName oname = createObjectName();
try {
Registry.getRegistry().unregisterComponent(oname);
if (log.isDebugEnabled()) {
log.debug("Unregistering logger " + oname);
}
} catch( Exception ex ) {
log.error( "Can't unregister logger " + oname, ex);
}
}
}
}
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