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The Apache Log4j Implementation
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache license, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the license for the specific language governing permissions and
* limitations under the license.
*/
package org.apache.logging.log4j.core.filter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.Marker;
import org.apache.logging.log4j.ThreadContext;
import org.apache.logging.log4j.core.Filter;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.Logger;
import org.apache.logging.log4j.core.config.Node;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
import org.apache.logging.log4j.core.config.plugins.PluginElement;
import org.apache.logging.log4j.core.config.plugins.PluginFactory;
import org.apache.logging.log4j.core.util.KeyValuePair;
import org.apache.logging.log4j.message.Message;
/**
* Filter based on a value in the Thread Context Map (MDC).
*/
@Plugin(name = "ThreadContextMapFilter", category = Node.CATEGORY, elementType = Filter.ELEMENT_TYPE, printObject = true)
public class ThreadContextMapFilter extends MapFilter {
private final String key;
private final String value;
private final boolean useMap;
public ThreadContextMapFilter(final Map> pairs, final boolean oper, final Result onMatch,
final Result onMismatch) {
super(pairs, oper, onMatch, onMismatch);
if (pairs.size() == 1) {
final Iterator>> iter = pairs.entrySet().iterator();
final Map.Entry> entry = iter.next();
if (entry.getValue().size() == 1) {
this.key = entry.getKey();
this.value = entry.getValue().get(0);
this.useMap = false;
} else {
this.key = null;
this.value = null;
this.useMap = true;
}
} else {
this.key = null;
this.value = null;
this.useMap = true;
}
}
@Override
public Result filter(final Logger logger, final Level level, final Marker marker, final String msg,
final Object... params) {
return filter();
}
@Override
public Result filter(final Logger logger, final Level level, final Marker marker, final Object msg,
final Throwable t) {
return filter();
}
@Override
public Result filter(final Logger logger, final Level level, final Marker marker, final Message msg,
final Throwable t) {
return filter();
}
private Result filter() {
boolean match = false;
if (useMap) {
for (final Map.Entry> entry : getMap().entrySet()) {
final String toMatch = ThreadContext.get(entry.getKey());
if (toMatch != null) {
match = entry.getValue().contains(toMatch);
} else {
match = false;
}
if ((!isAnd() && match) || (isAnd() && !match)) {
break;
}
}
} else {
match = value.equals(ThreadContext.get(key));
}
return match ? onMatch : onMismatch;
}
@Override
public Result filter(final LogEvent event) {
return super.filter(event.getContextMap()) ? onMatch : onMismatch;
}
@PluginFactory
public static ThreadContextMapFilter createFilter(
@PluginElement("Pairs") final KeyValuePair[] pairs,
@PluginAttribute("operator") final String oper,
@PluginAttribute("onMatch") final Result match,
@PluginAttribute("onMismatch") final Result mismatch) {
if (pairs == null || pairs.length == 0) {
LOGGER.error("key and value pairs must be specified for the ThreadContextMapFilter");
return null;
}
final Map> map = new HashMap<>();
for (final KeyValuePair pair : pairs) {
final String key = pair.getKey();
if (key == null) {
LOGGER.error("A null key is not valid in MapFilter");
continue;
}
final String value = pair.getValue();
if (value == null) {
LOGGER.error("A null value for key " + key + " is not allowed in MapFilter");
continue;
}
List list = map.get(pair.getKey());
if (list != null) {
list.add(value);
} else {
list = new ArrayList<>();
list.add(value);
map.put(pair.getKey(), list);
}
}
if (map.isEmpty()) {
LOGGER.error("ThreadContextMapFilter is not configured with any valid key value pairs");
return null;
}
final boolean isAnd = oper == null || !oper.equalsIgnoreCase("or");
return new ThreadContextMapFilter(map, isAnd, match, mismatch);
}
}