org.jboss.logging.util.OnlyOnceErrorHandler Maven / Gradle / Ivy
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* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.logging.util;
import java.io.PrintStream;
import org.apache.log4j.spi.ErrorHandler;
import org.apache.log4j.spi.LoggingEvent;
import org.apache.log4j.Logger;
import org.apache.log4j.Appender;
/**
The OnlyOnceErrorHandler implements log4j's default
error handling policy which consists of emitting a message for the
first error in an appender and ignoring all following errors.
The error message is printed on the specified print stream.
This policy aims at protecting an otherwise working application
from being flooded with error messages when logging fails.
@author Ceki Gülcü
@author Adrian Brock ([email protected]);
@since 0.9.0 */
public class OnlyOnceErrorHandler implements ErrorHandler {
final String WARN_PREFIX = "log4j warning: ";
final String ERROR_PREFIX = "log4j error: ";
boolean firstTime = true;
static PrintStream output = System.err;
public static void setOutput(PrintStream out)
{
output = out;
}
/**
Does not do anything.
*/
public
void setLogger(Logger logger) {
}
/**
No options to activate.
*/
public
void activateOptions() {
}
/**
Prints the message and the stack trace of the exception on
System.err. */
public
void error(String message, Exception e, int errorCode) {
error(message, e, errorCode, null);
}
/**
Prints the message and the stack trace of the exception on
System.err.
*/
public
void error(String message, Exception e, int errorCode, LoggingEvent event) {
if(firstTime) {
output.println(ERROR_PREFIX + message);
e.printStackTrace(output);
firstTime = false;
}
}
/**
Print a the error message passed as parameter on
System.err.
*/
public
void error(String message) {
if(firstTime) {
output.println(ERROR_PREFIX + message);
firstTime = false;
}
}
/**
Does not do anything.
*/
public
void setAppender(Appender appender) {
}
/**
Does not do anything.
*/
public
void setBackupAppender(Appender appender) {
}
}