[ http://jira.qos.ch/browse/LBCORE-45?page=com.atlassian.jira.plugin.system.is... ] Ceki Gulcu resolved LBCORE-45. ------------------------------ Resolution: Duplicate
introduce FlushableAppender ---------------------------
Key: LBCORE-45 URL: http://jira.qos.ch/browse/LBCORE-45 Project: logback-core Issue Type: Improvement Components: Appender Affects Versions: unspecified Environment: Operating System: Linux Platform: PC Reporter: Bruno Navert Assignee: Ceki Gulcu Priority: Minor
Suggest a new sub-interface of Appender: public interface FlushableAppender<E> extends Appender<E>, java.io.Flushable { } Then, WriterAppender could be defined to implement FlushableAppender, with this simple implementation: public void flush() throws IOException { writer.flush(); } This would allow manual flushing of the appenders. This is particularly useful when buffered IO is used, obviously. It allows, for instance, to manually flush all appenders when a request has been fully processed, ensuring that we retain the benefits of buffered IO while also having the full logs after request processing. Here's sample code I used to get all appenders (run once after Logback configuration): public static Set<Appender> getAllAppenders() { ContextSelector selector = StaticLoggerBinder.SINGLETON.getContextSelector(); LoggerContext loggerContext = selector.getLoggerContext(); Map<String, Appender> appenders = newHashMap(); // loop through all Loggers for ( Logger logger : loggerContext.getLoggerList() ) { // for each logger, loop through all its appenders Iterator iter = logger.iteratorForAppenders(); while ( iter.hasNext() ) { // appenders are uniquely identified by name, so store them in the Map thus // this will overwrite the same entry in the Map many times (with the same reference) Appender appender = ( Appender ) iter.next(); appenders.put( appender.getName(), appender ); } } return newHashSet( appenders.values() ); } The below bean is used in Spring, calling flush() forces all appenders to be flushed: public class LogbackFlushBean implements Flushable { protected final Logger log = LoggerFactory.getLogger( getClass() ); private final Collection<FlushableAppender> flushableAppenders = newLinkedList(); @PostConstruct public void loadFlushableAppenders() { for ( Appender appender : LogbackConfigurer.getAllAppenders() ) { if ( appender instanceof FlushableAppender ) { flushableAppenders.add( ( FlushableAppender ) appender ); } else { log.debug( "appender {} is not Flushable, skipping", appender.getName() ); } } } public void flush() throws IOException { for ( FlushableAppender appender : flushableAppenders ) { log.debug( "flushing appender {}", appender.getName() ); appender.flush(); } } }
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