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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
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* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
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* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* Copyright 2004 The Apache Software Foundation
*
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
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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);
}