org.apache.log4j.helpers.OnlyOnceErrorHandler Maven / Gradle / Ivy
/*
* 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.log4j.helpers;
import org.apache.log4j.spi.ErrorHandler;
import org.apache.log4j.spi.LoggingEvent;
import org.apache.log4j.Logger;
import org.apache.log4j.Appender;
import java.io.InterruptedIOException;
/**
*
* 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 System.err.
*
*
* This policy aims at protecting an otherwise working application from being
* flooded with error messages when logging fails.
*
* @author Ceki Gülcü
* @since 0.9.0
*/
public class OnlyOnceErrorHandler implements ErrorHandler {
final String WARN_PREFIX = "log4j warning: ";
final String ERROR_PREFIX = "log4j error: ";
boolean firstTime = true;
/**
* 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 (e instanceof InterruptedIOException || e instanceof InterruptedException) {
Thread.currentThread().interrupt();
}
if (firstTime) {
LogLog.error(message, e);
firstTime = false;
}
}
/**
* Print a the error message passed as parameter on System.err.
*/
public void error(String message) {
if (firstTime) {
LogLog.error(message);
firstTime = false;
}
}
/**
* Does not do anything.
*/
public void setAppender(Appender appender) {
}
/**
* Does not do anything.
*/
public void setBackupAppender(Appender appender) {
}
}