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/**
* Copyright (c) 2004-2011 QOS.ch
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
package org.slf4j.spi;
import java.util.Deque;
import java.util.Map;
/**
* This interface abstracts the service offered by various MDC
* implementations.
*
* @author Ceki Gülcü
* @since 1.4.1
*/
public interface MDCAdapter {
/**
* Put a context value (the <code>val</code> parameter) as identified with
* the <code>key</code> parameter into the current thread's context map.
* The <code>key</code> parameter cannot be null. The <code>val</code> parameter
* can be null only if the underlying implementation supports it.
*
* <p>If the current thread does not have a context map it is created as a side
* effect of this call.
*/
public void put(String key, String val);
/**
* Get the context identified by the <code>key</code> parameter.
* The <code>key</code> parameter cannot be null.
*
* @return the string value identified by the <code>key</code> parameter.
*/
public String get(String key);
/**
* Remove the context identified by the <code>key</code> parameter.
* The <code>key</code> parameter cannot be null.
*
* <p>
* This method does nothing if there is no previous value
* associated with <code>key</code>.
*/
public void remove(String key);
/**
* Clear all entries in the MDC.
*/
public void clear();
/**
* Return a copy of the current thread's context map, with keys and
* values of type String. Returned value may be null.
*
* @return A copy of the current thread's context map. May be null.
* @since 1.5.1
*/
public Map<String, String> getCopyOfContextMap();
/**
* Set the current thread's context map by first clearing any existing
* map and then copying the map passed as parameter. The context map
* parameter must only contain keys and values of type String.
*
* Implementations must support null valued map passed as parameter.
*
* @param contextMap must contain only keys and values of type String
*
* @since 1.5.1
*/
public void setContextMap(Map<String, String> contextMap);
/**
* Push a value into the deque(stack) referenced by 'key'.
*
* @param key identifies the appropriate stack
* @param value the value to push into the stack
* @since 2.0.0
*/
public void pushByKey(String key, String value);
/**
* Pop the stack referenced by 'key' and return the value possibly null.
*
* @param key identifies the deque(stack)
* @return the value just popped. May be null/
* @since 2.0.0
*/
public String popByKey(String key);
/**
* Returns a copy of the deque(stack) referenced by 'key'. May be null.
*
* @param key identifies the stack
* @return copy of stack referenced by 'key'. May be null.
*
* @since 2.0.0
*/
public Deque<String> getCopyOfDequeByKey(String key);
/**
* Clear the deque(stack) referenced by 'key'.
*
* @param key identifies the stack
*
* @since 2.0.0
*/
public void clearDequeByKey(String key);
}
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