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/*
* 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.lookup;
import org.apache.logging.log4j.ThreadContext;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.ContextDataInjector;
import org.apache.logging.log4j.core.impl.ContextDataInjectorFactory;
import org.apache.logging.log4j.util.ReadOnlyStringMap;
/**
* Looks up keys from the context. By default this is the {@link ThreadContext}, but users may
* {@linkplain ContextDataInjectorFactory configure} a custom {@link ContextDataInjector} which obtains context data
* from some other source.
*/
@Plugin(name = "ctx", category = StrLookup.CATEGORY)
public class ContextMapLookup implements StrLookup {
private final ContextDataInjector injector = ContextDataInjectorFactory.createInjector();
/**
* Looks up the value from the ThreadContext Map.
* @param key the key to be looked up, may be null
* @return The value associated with the key.
*/
@Override
public String lookup(final String key) {
return currentContextData().getValue(key);
}
private ReadOnlyStringMap currentContextData() {
return injector.rawContextData();
}
/**
* Looks up the value from the ThreadContext Map.
* @param event The current LogEvent.
* @param key the key to be looked up, may be null
* @return The value associated with the key.
*/
@Override
public String lookup(final LogEvent event, final String key) {
return event.getContextData().getValue(key);
}
}