org.apache.catalina.Logger Maven / Gradle / Ivy

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 * Copyright 2004 The Apache Software Foundation
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 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
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package org.apache.catalina;


import java.beans.PropertyChangeListener;


/**
 * A Logger 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
     * <description>/<version>.
     */
    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 String 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
     * log(msg, exception) 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 Exception 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
     * Throwable 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 String that describes the error or
     *  exception
     * @param throwable The Throwable 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 String 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 String that describes the error or
     *  exception
     * @param throwable The Throwable 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);


}