ch.qos.logback.classic.sift.MDCBasedDiscriminator Maven / Gradle / Ivy
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/**
* 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.sift;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.sift.AbstractDiscriminator;
import ch.qos.logback.core.util.OptionHelper;
import java.util.Map;
/**
* MDCBasedDiscriminator essentially returns the value mapped to an MDC key. If
* the said value is null, then a default value is returned.
*
* Both Key and the DefaultValue are user specified properties.
*
* @author Ceki Gülcü
*/
public class MDCBasedDiscriminator extends AbstractDiscriminator {
private String key;
private String defaultValue;
/**
* Return the value associated with an MDC entry designated by the Key
* property. If that value is null, then return the value assigned to the
* DefaultValue property.
*/
public String getDiscriminatingValue(ILoggingEvent event) {
// http://jira.qos.ch/browse/LBCLASSIC-213
Map mdcMap = event.getMDCPropertyMap();
if (mdcMap == null) {
return defaultValue;
}
String mdcValue = mdcMap.get(key);
if (mdcValue == null) {
return defaultValue;
} else {
return mdcValue;
}
}
@Override
public void start() {
int errors = 0;
if (OptionHelper.isEmpty(key)) {
errors++;
addError("The \"Key\" property must be set");
}
if (OptionHelper.isEmpty(defaultValue)) {
errors++;
addError("The \"DefaultValue\" property must be set");
}
if (errors == 0) {
started = true;
}
}
public String getKey() {
return key;
}
public void setKey(String key) {
this.key = key;
}
/**
* @return
* @see #setDefaultValue(String)
*/
public String getDefaultValue() {
return defaultValue;
}
/**
* The default MDC value in case the MDC is not set for
* {@link #setKey(String) mdcKey}.
*
* For example, if {@link #setKey(String) Key} is set to the value
* "someKey", and the MDC is not set for "someKey", then this appender will
* use the default value, which you can set with the help of this method.
*
* @param defaultValue
*/
public void setDefaultValue(String defaultValue) {
this.defaultValue = defaultValue;
}
}