org.apache.logging.log4j.spi.ThreadContextMap Maven / Gradle / Ivy
/*
* 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.spi;
import java.util.Map;
import org.apache.logging.log4j.ThreadContext;
/**
* Service provider interface to implement custom MDC behavior for {@link org.apache.logging.log4j.ThreadContext}.
*
* Since 2.8, {@code ThreadContextMap} implementations that implement the {@link ReadOnlyThreadContextMap} interface
* are accessible to applications via the {@link ThreadContext#getThreadContextMap()} method.
*
*/
public interface ThreadContextMap {
/**
* Clears the context.
*/
void clear();
/**
* Determines if the key is in the context.
* @param key The key to locate.
* @return True if the key is in the context, false otherwise.
*/
boolean containsKey(final String key);
/**
* Gets the context identified by the key parameter.
*
* This method has no side effects.
* @param key The key to locate.
* @return The value associated with the key or null.
*/
String get(final String key);
/**
* Gets a non-{@code null} mutable copy of current thread's context Map.
* @return a mutable copy of the context.
*/
Map getCopy();
/**
* Returns an immutable view on the context Map or {@code null} if the context map is empty.
* @return an immutable context Map or {@code null}.
*/
Map getImmutableMapOrNull();
/**
* Returns true if the Map is empty.
* @return true if the Map is empty, false otherwise.
*/
boolean isEmpty();
/**
* Puts a context value (the o parameter) as identified
* with the key parameter into the current thread's
* context map.
*
* If the current thread does not have a context map it is
* created as a side effect.
* @param key The key name.
* @param value The key value.
*/
void put(final String key, final String value);
/**
* Removes the the context identified by the key
* parameter.
* @param key The key to remove.
*/
void remove(final String key);
}