Author: ceki Date: Mon Mar 23 17:19:38 2009 New Revision: 2260 Added: logback/trunk/logback-classic/src/main/java/ch/qos/logback/classic/sift/ContextBasedDiscriminator.java Log: ContextBasedDiscriminator allows SiftingAppender to separate logging based on the context name. This fits nicely the requirements expressed in LBCLASSIC-117 Added: logback/trunk/logback-classic/src/main/java/ch/qos/logback/classic/sift/ContextBasedDiscriminator.java ============================================================================== --- (empty file) +++ logback/trunk/logback-classic/src/main/java/ch/qos/logback/classic/sift/ContextBasedDiscriminator.java Mon Mar 23 17:19:38 2009 @@ -0,0 +1,85 @@ +/** + * Logback: the generic, reliable, fast and flexible logging framework. + * + * Copyright (C) 2000-2008, QOS.ch + * + * This library 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. + */ +package ch.qos.logback.classic.sift; + +import ch.qos.logback.classic.spi.ILoggingEvent; +import ch.qos.logback.core.sift.Discriminator; +import ch.qos.logback.core.spi.ContextAwareBase; + +/** + * This discriminator essentially returns the value mapped to an MDC key. If the + * said value is null, then a default value is returned. + * + * <p>Both Key and the DefaultValue are user specified properties. + * + * @author Ceki Gülcü + * + */ +public class ContextBasedDiscriminator extends ContextAwareBase implements + Discriminator<ILoggingEvent> { + + private static final String KEY = "contextName"; + private String defaultValue; + private boolean started = false; + + public ContextBasedDiscriminator() { + } + + /** + * Return the name of the current context name as found in the logging event. + */ + public String getDiscriminatingValue(ILoggingEvent event) { + String contextName = event.getLoggerContextVO().getName(); + + if (contextName == null) { + return defaultValue; + } else { + return contextName; + } + } + + public boolean isStarted() { + return started; + } + + public void start() { + started = true; + } + + public void stop() { + started = false; + } + + public String getKey() { + return KEY; + } + + public void setKey(String key) { + throw new UnsupportedOperationException("Key cannot be set. Using fixed key "+KEY); + } + + /** + * @see #setDefaultValue(String) + * @return + */ + public String getDefaultValue() { + return defaultValue; + } + + /** + * The default context name in case the context name is not set for the + * current logging event. + * + * @param defaultValue + */ + public void setDefaultValue(String defaultValue) { + this.defaultValue = defaultValue; + } +}