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) {
- }
-}