Source Code Cross Referenced for Logger.java in  » Sevlet-Container » tomcat-catalina » org » apache » catalina » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Sevlet Container » tomcat catalina » org.apache.catalina 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 1999,2004 The Apache Software Foundation.
003:         * 
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         * 
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         * 
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.apache.catalina;
018:
019:        import java.beans.PropertyChangeListener;
020:
021:        /**
022:         * A <b>Logger</b> is a generic interface for the message and exception
023:         * logging methods of the ServletContext interface.  Loggers can be
024:         * attached at any Container level, but will typically only be attached
025:         * to a Context, or higher level, Container.
026:         *
027:         * @author Craig R. McClanahan
028:         * @version $Revision: 1.2 $ $Date: 2004/02/27 14:58:38 $
029:         */
030:
031:        public interface Logger {
032:
033:            // ----------------------------------------------------- Manifest Constants
034:
035:            /**
036:             * Verbosity level constants for log messages that may be filtered
037:             * by the underlying logger.
038:             */
039:
040:            public static final int FATAL = Integer.MIN_VALUE;
041:
042:            public static final int ERROR = 1;
043:
044:            public static final int WARNING = 2;
045:
046:            public static final int INFORMATION = 3;
047:
048:            public static final int DEBUG = 4;
049:
050:            // ------------------------------------------------------------- Properties
051:
052:            /**
053:             * Return the Container with which this Logger has been associated.
054:             */
055:            public Container getContainer();
056:
057:            /**
058:             * Set the Container with which this Logger has been associated.
059:             *
060:             * @param container The associated Container
061:             */
062:            public void setContainer(Container container);
063:
064:            /**
065:             * Return descriptive information about this Logger implementation and
066:             * the corresponding version number, in the format
067:             * <code>&lt;description&gt;/&lt;version&gt;</code>.
068:             */
069:            public String getInfo();
070:
071:            /**
072:             * Return the verbosity level of this logger.  Messages logged with a
073:             * higher verbosity than this level will be silently ignored.
074:             */
075:            public int getVerbosity();
076:
077:            /**
078:             * Set the verbosity level of this logger.  Messages logged with a
079:             * higher verbosity than this level will be silently ignored.
080:             *
081:             * @param verbosity The new verbosity level
082:             */
083:            public void setVerbosity(int verbosity);
084:
085:            // --------------------------------------------------------- Public Methods
086:
087:            /**
088:             * Add a property change listener to this component.
089:             *
090:             * @param listener The listener to add
091:             */
092:            public void addPropertyChangeListener(
093:                    PropertyChangeListener listener);
094:
095:            /**
096:             * Writes the specified message to a servlet log file, usually an event
097:             * log.  The name and type of the servlet log is specific to the
098:             * servlet container.  This message will be logged unconditionally.
099:             *
100:             * @param message A <code>String</code> specifying the message to be
101:             *  written to the log file
102:             */
103:            public void log(String message);
104:
105:            /**
106:             * Writes the specified exception, and message, to a servlet log file.
107:             * The implementation of this method should call
108:             * <code>log(msg, exception)</code> instead.  This method is deprecated
109:             * in the ServletContext interface, but not deprecated here to avoid
110:             * many useless compiler warnings.  This message will be logged
111:             * unconditionally.
112:             *
113:             * @param exception An <code>Exception</code> to be reported
114:             * @param msg The associated message string
115:             */
116:            public void log(Exception exception, String msg);
117:
118:            /**
119:             * Writes an explanatory message and a stack trace for a given
120:             * <code>Throwable</code> exception to the servlet log file.  The name
121:             * and type of the servlet log file is specific to the servlet container,
122:             * usually an event log.  This message will be logged unconditionally.
123:             *
124:             * @param message A <code>String</code> that describes the error or
125:             *  exception
126:             * @param throwable The <code>Throwable</code> error or exception
127:             */
128:            public void log(String message, Throwable throwable);
129:
130:            /**
131:             * Writes the specified message to the servlet log file, usually an event
132:             * log, if the logger is set to a verbosity level equal to or higher than
133:             * the specified value for this message.
134:             *
135:             * @param message A <code>String</code> specifying the message to be
136:             *  written to the log file
137:             * @param verbosity Verbosity level of this message
138:             */
139:            public void log(String message, int verbosity);
140:
141:            /**
142:             * Writes the specified message and exception to the servlet log file,
143:             * usually an event log, if the logger is set to a verbosity level equal
144:             * to or higher than the specified value for this message.
145:             *
146:             * @param message A <code>String</code> that describes the error or
147:             *  exception
148:             * @param throwable The <code>Throwable</code> error or exception
149:             * @param verbosity Verbosity level of this message
150:             */
151:            public void log(String message, Throwable throwable, int verbosity);
152:
153:            /**
154:             * Remove a property change listener from this component.
155:             *
156:             * @param listener The listener to remove
157:             */
158:            public void removePropertyChangeListener(
159:                    PropertyChangeListener listener);
160:
161:        }
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