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* Copyright 2004 The Apache Software Foundation
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package org.apache.catalina;
import java.beans.PropertyChangeListener;
/**
* A <b>Logger</b> is a generic interface for the message and exception
* logging methods of the ServletContext interface. Loggers can be
* attached at any Container level, but will typically only be attached
* to a Context, or higher level, Container.
*
* @author Craig R. McClanahan
* @version $Revision: 1.2 $ $Date: 2005/12/08 01:27:18 $
*/
public interface Logger {
// ----------------------------------------------------- Manifest Constants
/**
* Verbosity level constants for log messages that may be filtered
* by the underlying logger.
*/
public static final int FATAL = Integer.MIN_VALUE;
public static final int ERROR = 1;
public static final int WARNING = 2;
public static final int INFORMATION = 3;
public static final int DEBUG = 4;
// ------------------------------------------------------------- Properties
/**
* Return the Container with which this Logger has been associated.
*/
public Container getContainer();
/**
* Set the Container with which this Logger has been associated.
*
* @param container The associated Container
*/
public void setContainer(Container container);
/**
* Return descriptive information about this Logger implementation and
* the corresponding version number, in the format
* <code><description>/<version></code>.
*/
public String getInfo();
/**
* Return the verbosity level of this logger. Messages logged with a
* higher verbosity than this level will be silently ignored.
*/
public int getVerbosity();
/**
* 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);
// --------------------------------------------------------- Public Methods
/**
* Add a property change listener to this component.
*
* @param listener The listener to add
*/
public void addPropertyChangeListener(PropertyChangeListener 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 message);
/**
* 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);
/**
* 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 message A <code>String</code> that describes the error or
* exception
* @param throwable The <code>Throwable</code> error or exception
*/
public void log(String message, Throwable throwable);
/**
* 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);
/**
* 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);
/**
* Remove a property change listener from this component.
*
* @param listener The listener to remove
*/
public void removePropertyChangeListener(PropertyChangeListener listener);
}