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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.helpers;

import org.slf4j.spi.MDCAdapter;

import java.util.*;

/**
 * Basic MDC implementation, which can be used with logging systems that lack
 * out-of-the-box MDC support.
 *
 * This code was initially inspired by  logback's LogbackMDCAdapter. However,
 * LogbackMDCAdapter has evolved and is now considerably more sophisticated.
 *
 * @author Ceki Gulcu
 * @author Maarten Bosteels
 * @author Lukasz Cwik
 * 
 * @since 1.5.0
 */
public class BasicMDCAdapter implements MDCAdapter {

    private final ThreadLocalMapOfStacks threadLocalMapOfDeques = new ThreadLocalMapOfStacks();

    private final InheritableThreadLocal> inheritableThreadLocalMap = new InheritableThreadLocal>() {
        @Override
        protected Map childValue(Map parentValue) {
            if (parentValue == null) {
                return null;
            }
            return new HashMap<>(parentValue);
        }
    };

    /**
     * Put a context value (the val parameter) as identified with
     * the key parameter into the current thread's context map.
     * Note that contrary to log4j, the val parameter can be null.
     *
     * 

* If the current thread does not have a context map it is created as a side * effect of this call. * * @throws IllegalArgumentException * in case the "key" parameter is null */ public void put(String key, String val) { if (key == null) { throw new IllegalArgumentException("key cannot be null"); } Map map = inheritableThreadLocalMap.get(); if (map == null) { map = new HashMap<>(); inheritableThreadLocalMap.set(map); } map.put(key, val); } /** * Get the context identified by the key parameter. */ public String get(String key) { Map map = inheritableThreadLocalMap.get(); if ((map != null) && (key != null)) { return map.get(key); } else { return null; } } /** * Remove the context identified by the key parameter. */ public void remove(String key) { Map map = inheritableThreadLocalMap.get(); if (map != null) { map.remove(key); } } /** * Clear all entries in the MDC. */ public void clear() { Map map = inheritableThreadLocalMap.get(); if (map != null) { map.clear(); inheritableThreadLocalMap.remove(); } } /** * Returns the keys in the MDC as a {@link Set} of {@link String}s The * returned value can be null. * * @return the keys in the MDC */ public Set getKeys() { Map map = inheritableThreadLocalMap.get(); if (map != null) { return map.keySet(); } else { return null; } } /** * Return a copy of the current thread's context map. * Returned value may be null. * */ public Map getCopyOfContextMap() { Map oldMap = inheritableThreadLocalMap.get(); if (oldMap != null) { return new HashMap<>(oldMap); } else { return null; } } public void setContextMap(Map contextMap) { Map copy = null; if (contextMap != null) { copy = new HashMap<>(contextMap); } inheritableThreadLocalMap.set(copy); } @Override public void pushByKey(String key, String value) { threadLocalMapOfDeques.pushByKey(key, value); } @Override public String popByKey(String key) { return threadLocalMapOfDeques.popByKey(key); } @Override public Deque getCopyOfDequeByKey(String key) { return threadLocalMapOfDeques.getCopyOfDequeByKey(key); } @Override public void clearDequeByKey(String key) { threadLocalMapOfDeques.clearDequeByKey(key); } }





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