Quelle Log.java Sprache: JAVA

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.juli.logging;

/**
* A simple logging interface abstracting logging APIs. In order to be
* instantiated successfully by {@link LogFactory}, classes that implement
* this interface must have a constructor that takes a single String
* parameter representing the "name" of this Log.
*
* The six logging levels used by <code>Log</code> are (in order):
* <ol>
* <li>trace (the least serious)</li>
* <li>debug</li>
* <li>info</li>
* <li>warn</li>
* <li>error</li>
* <li>fatal (the most serious)</li>
* </ol>
* The mapping of these log levels to the concepts used by the underlying
* logging system is implementation dependent.
* The implementation should ensure, though, that this ordering behaves
* as expected.
*
* Performance is often a logging concern.
* By examining the appropriate property,
* a component can avoid expensive operations (producing information
* to be logged).
*
* For example,
* <code>
* if (log.isDebugEnabled()) {
* ... do something expensive ...
* log.debug(theResult);
* }
* </code>
* 
*
* Configuration of the underlying logging system will generally be done
* external to the Logging APIs, through whatever mechanism is supported by
* that system.
*
* @author <a href="mailto:sanders@apache.org">Scott Sanders</a>
* @author Rod Waldhoff
*/
public interface Log {

 // ----------------------------------------------------- Logging Properties

 /**
 * Is debug logging currently enabled? 
 *
 * Call this method to prevent having to perform expensive operations
 * (for example, <code>String</code> concatenation)
 * when the log level is more than debug. 
 *
 * @return <code>true</code> if debug level logging is enabled, otherwise
 * <code>false</code>
 */
 boolean isDebugEnabled();

 /**
 * Is error logging currently enabled? 
 *
 * Call this method to prevent having to perform expensive operations
 * (for example, <code>String</code> concatenation)
 * when the log level is more than error. 
 *
 * @return <code>true</code> if error level logging is enabled, otherwise
 * <code>false</code>
 */
 boolean isErrorEnabled();

 /**
 * Is fatal logging currently enabled? 
 *
 * Call this method to prevent having to perform expensive operations
 * (for example, <code>String</code> concatenation)
 * when the log level is more than fatal. 
 *
 * @return <code>true</code> if fatal level logging is enabled, otherwise
 * <code>false</code>
 */
 boolean isFatalEnabled();

 /**
 * Is info logging currently enabled? 
 *
 * Call this method to prevent having to perform expensive operations
 * (for example, <code>String</code> concatenation)
 * when the log level is more than info. 
 *
 * @return <code>true</code> if info level logging is enabled, otherwise
 * <code>false</code>
 */
 boolean isInfoEnabled();

 /**
 * Is trace logging currently enabled? 
 *
 * Call this method to prevent having to perform expensive operations
 * (for example, <code>String</code> concatenation)
 * when the log level is more than trace. 
 *
 * @return <code>true</code> if trace level logging is enabled, otherwise
 * <code>false</code>
 */
 boolean isTraceEnabled();

 /**
 * Is warn logging currently enabled? 
 *
 * Call this method to prevent having to perform expensive operations
 * (for example, <code>String</code> concatenation)
 * when the log level is more than warn. 
 *
 * @return <code>true</code> if warn level logging is enabled, otherwise
 * <code>false</code>
 */
 boolean isWarnEnabled();

 // -------------------------------------------------------- Logging Methods

 /**
 * Log a message with trace log level. 
 *
 * @param message log this message
 */
 void trace(Object message);

 /**
 * Log an error with trace log level. 
 *
 * @param message log this message
 * @param t log this cause
 */
 void trace(Object message, Throwable t);

 /**
 * Log a message with debug log level. 
 *
 * @param message log this message
 */
 void debug(Object message);

 /**
 * Log an error with debug log level. 
 *
 * @param message log this message
 * @param t log this cause
 */
 void debug(Object message, Throwable t);

 /**
 * Log a message with info log level. 
 *
 * @param message log this message
 */
 void info(Object message);

 /**
 * Log an error with info log level. 
 *
 * @param message log this message
 * @param t log this cause
 */
 void info(Object message, Throwable t);

 /**
 * Log a message with warn log level. 
 *
 * @param message log this message
 */
 void warn(Object message);

 /**
 * Log an error with warn log level. 
 *
 * @param message log this message
 * @param t log this cause
 */
 void warn(Object message, Throwable t);

 /**
 * Log a message with error log level. 
 *
 * @param message log this message
 */
 void error(Object message);

 /**
 * Log an error with error log level. 
 *
 * @param message log this message
 * @param t log this cause
 */
 void error(Object message, Throwable t);

 /**
 * Log a message with fatal log level. 
 *
 * @param message log this message
 */
 void fatal(Object message);

 /**
 * Log an error with fatal log level. 
 *
 * @param message log this message
 * @param t log this cause
 */
 void fatal(Object message, Throwable t);

}

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