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With inspiration from other libraries
/**
* Logback: the reliable, generic, fast and flexible logging framework.
* Copyright (C) 1999-2015, QOS.ch. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation.
*/
package ch.qos.logback.classic.joran.action;
import ch.qos.logback.classic.spi.LoggerContextListener;
import ch.qos.logback.core.spi.ContextAware;
import ch.qos.logback.core.spi.LifeCycle;
import org.xml.sax.Attributes;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.core.joran.action.Action;
import ch.qos.logback.core.joran.spi.ActionException;
import ch.qos.logback.core.joran.spi.InterpretationContext;
import ch.qos.logback.core.util.OptionHelper;
public class LoggerContextListenerAction extends Action {
boolean inError = false;
LoggerContextListener lcl;
@Override
public void begin(InterpretationContext ec, String name, Attributes attributes) throws ActionException {
inError = false;
String className = attributes.getValue(CLASS_ATTRIBUTE);
if (OptionHelper.isEmpty(className)) {
addError("Mandatory \"" + CLASS_ATTRIBUTE + "\" attribute not set for element");
inError = true;
return;
}
try {
lcl = (LoggerContextListener) OptionHelper.instantiateByClassName(className, LoggerContextListener.class, context);
if (lcl instanceof ContextAware) {
((ContextAware) lcl).setContext(context);
}
ec.pushObject(lcl);
addInfo("Adding LoggerContextListener of type [" + className + "] to the object stack");
} catch (Exception oops) {
inError = true;
addError("Could not create LoggerContextListener of type " + className + "].", oops);
}
}
@Override
public void end(InterpretationContext ec, String name) throws ActionException {
if (inError) {
return;
}
Object o = ec.peekObject();
if (o != lcl) {
addWarn("The object on the top the of the stack is not the LoggerContextListener pushed earlier.");
} else {
if (lcl instanceof LifeCycle) {
((LifeCycle) lcl).start();
addInfo("Starting LoggerContextListener");
}
((LoggerContext) context).addListener(lcl);
ec.popObject();
}
}
}