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/*
* Copyright 2001-2004 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
* 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.commons.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 Log are (in order):
*
* - trace (the least serious)
* - debug
* - info
* - warn
* - error
* - fatal (the most serious)
*
* 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,
*
* if (log.isDebugEnabled()) {
* ... do something expensive ...
* log.debug(theResult);
* }
*
*
* Configuration of the underlying logging system will generally be done
* external to the Logging APIs, through whatever mechanism is supported by
* that system.
*
* Please note that this interface is identical to that found in JCL 1.1.1.
*
* @author Scott Sanders
* @author Rod Waldhoff
* @version $Id: Log.java,v 1.19 2004/06/06 21:16:04 rdonkin Exp $
*/
public interface Log {
// ----------------------------------------------------- Logging Properties
/**
* Is debug logging currently enabled?
*
* Call this method to prevent having to perform expensive operations
* (for example, String concatenation)
* when the log level is more than debug.
*/
public boolean isDebugEnabled();
/**
* Is error logging currently enabled?
*
* Call this method to prevent having to perform expensive operations
* (for example, String concatenation)
* when the log level is more than error.
*/
public boolean isErrorEnabled();
/**
* Is fatal logging currently enabled?
*
* Call this method to prevent having to perform expensive operations
* (for example, String concatenation)
* when the log level is more than fatal.
*/
public boolean isFatalEnabled();
/**
* Is info logging currently enabled?
*
* Call this method to prevent having to perform expensive operations
* (for example, String concatenation)
* when the log level is more than info.
*
* @return true if info enabled, false otherwise
*/
public boolean isInfoEnabled();
/**
* Is trace logging currently enabled?
*
* Call this method to prevent having to perform expensive operations
* (for example, String concatenation)
* when the log level is more than trace.
*
* @return true if trace enabled, false otherwise
*/
public boolean isTraceEnabled();
/**
* Is warn logging currently enabled?
*
* Call this method to prevent having to perform expensive operations
* (for example, String concatenation)
* when the log level is more than warn.
*/
public boolean isWarnEnabled();
// -------------------------------------------------------- Logging Methods
/**
* Log a message with trace log level.
*
* @param message log this message
*/
public void trace(Object message);
/**
* Log an error with trace log level.
*
* @param message log this message
* @param t log this cause
*/
public void trace(Object message, Throwable t);
/**
* Log a message with debug log level.
*
* @param message log this message
*/
public void debug(Object message);
/**
* Log an error with debug log level.
*
* @param message log this message
* @param t log this cause
*/
public void debug(Object message, Throwable t);
/**
* Log a message with info log level.
*
* @param message log this message
*/
public void info(Object message);
/**
* Log an error with info log level.
*
* @param message log this message
* @param t log this cause
*/
public void info(Object message, Throwable t);
/**
* Log a message with warn log level.
*
* @param message log this message
*/
public void warn(Object message);
/**
* Log an error with warn log level.
*
* @param message log this message
* @param t log this cause
*/
public void warn(Object message, Throwable t);
/**
* Log a message with error log level.
*
* @param message log this message
*/
public void error(Object message);
/**
* Log an error with error log level.
*
* @param message log this message
* @param t log this cause
*/
public void error(Object message, Throwable t);
/**
* Log a message with fatal log level.
*
* @param message log this message
*/
public void fatal(Object message);
/**
* Log an error with fatal log level.
*
* @param message log this message
* @param t log this cause
*/
public void fatal(Object message, Throwable t);
}