org.apache.rocketmq.shaded.ch.qos.logback.core.filter.EvaluatorFilter Maven / Gradle / Ivy
/**
* 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 org.apache.rocketmq.shaded.ch.qos.logback.core.filter;
import org.apache.rocketmq.shaded.ch.qos.logback.core.boolex.EvaluationException;
import org.apache.rocketmq.shaded.ch.qos.logback.core.boolex.EventEvaluator;
import org.apache.rocketmq.shaded.ch.qos.logback.core.spi.FilterReply;
/**
* The value of the {@link #onMatch} and {@link #onMismatch} attributes is set
* to {@link FilterReply#NEUTRAL}, so that a badly configured evaluator filter does
* not disturb the functioning of the filter chain.
*
* It is expected that one of the two attributes will have its value changed
* to {@link FilterReply#ACCEPT} or {@link FilterReply#DENY}. That way, it is possible to
* decide if a given result must be returned after the evaluation either failed
* or succeeded.
*
*
*
For more information about filters, please refer to the online manual at
* http://logback.qos.ch/manual/filters.html
*
* @author Ceki Gülcü
* @author Sébastien Pennec
*/
public class EvaluatorFilter extends AbstractMatcherFilter {
EventEvaluator evaluator;
@Override
public void start() {
if (evaluator != null) {
super.start();
} else {
addError("No evaluator set for filter " + this.getName());
}
}
public EventEvaluator getEvaluator() {
return evaluator;
}
public void setEvaluator(EventEvaluator evaluator) {
this.evaluator = evaluator;
}
public FilterReply decide(E event) {
// let us not throw an exception
// see also bug #17.
if (!isStarted() || !evaluator.isStarted()) {
return FilterReply.NEUTRAL;
}
try {
if (evaluator.evaluate(event)) {
return onMatch;
} else {
return onMismatch;
}
} catch (EvaluationException e) {
addError("Evaluator " + evaluator.getName() + " threw an exception", e);
return FilterReply.NEUTRAL;
}
}
}