本文整理了Java中org.apache.log4j.MDC类的一些代码示例，展示了MDC类的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。MDC类的具体详情如下：
包路径：org.apache.log4j.MDC
类名称：MDC

MDC介绍

[英]Wrap the PaxContext with MDC api. PaxContext is derived from original MDC.
[中]用MDC api包装PaxContext。PaxContext源于原始MDC。

代码示例

代码示例来源：origin: hibernate/hibernate-orm

public Object putMdc(String key, Object val) {
  try {
    return MDC.get( key );
  }
  finally {
    MDC.put( key, val );
  }
}

代码示例来源：origin: org.freemarker/freemarker

/**
 * Returns if Log4j-over-SLF4J is actually working. Sometimes the API classes are present, but there's no SLF4J
 * implementation around.
 */
public static final boolean test() {
  org.apache.log4j.MDC.put(MDC_KEY, "");
  try {
    return org.slf4j.MDC.get(MDC_KEY) != null;
  } finally {
    org.apache.log4j.MDC.remove(MDC_KEY);
  }
}

代码示例来源：origin: log4j/log4j

/**
  Obtain a copy of this thread's MDC prior to serialization or
  asynchronous logging.  
*/
public
void getMDCCopy() {
 if(mdcCopyLookupRequired) {
  mdcCopyLookupRequired = false;
  // the clone call is required for asynchronous logging.
  // See also bug #5932.
  Hashtable t = (Hashtable) MDC.getContext();
  if(t != null) {
 mdcCopy = (Hashtable) t.clone();
  }
 }
}

代码示例来源：origin: org.slf4j/slf4j-log4j12

@SuppressWarnings({ "rawtypes", "unchecked" })
  public void setContextMap(Map contextMap) {
    Map old = org.apache.log4j.MDC.getContext();
    if (old == null) {
      Iterator entrySetIterator = contextMap.entrySet().iterator();
      while (entrySetIterator.hasNext()) {
        Map.Entry mapEntry = (Map.Entry) entrySetIterator.next();
        org.apache.log4j.MDC.put((String) mapEntry.getKey(), mapEntry.getValue());
      }
    } else {
      old.clear();
      old.putAll(contextMap);
    }
  }
}

代码示例来源：origin: log4j/log4j

/**
  Returns the the context corresponding to the <code>key</code>
  parameter. If there is a local MDC copy, possibly because we are
  in a logging server or running inside AsyncAppender, then we
  search for the key in MDC copy, if a value is found it is
  returned. Otherwise, if the search in MDC copy returns a null
  result, then the current thread's <code>MDC</code> is used.
  
  <p>Note that <em>both</em> the local MDC copy and the current
  thread's MDC are searched.
*/
public
Object getMDC(String key) {
 Object r;
 // Note the mdcCopy is used if it exists. Otherwise we use the MDC
 // that is associated with the thread.
 if(mdcCopy != null) {
  r = mdcCopy.get(key);
  if(r != null) {
   return r;
  }
 }
 return MDC.get(key);
}

代码示例来源：origin: performancecopilot/parfait

public void testClearRemovesMDCValue() {

    ThreadContext log4jThreadContext = ThreadContext.newMDCEnabledContext();

    Hashtable mdcContext = MDC.getContext();
    assertTrue(mdcContext == null || mdcContext.isEmpty());

    final String testKey = "painter";
    log4jThreadContext.put(testKey, 7);

    mdcContext = MDC.getContext();
    assertEquals(1, mdcContext.size());

    mdcContext.clear();
    assertEquals(0, mdcContext.size());

    log4jThreadContext.clear();
    assertNull("get() after clear should return null", log4jThreadContext.get(testKey));
  }
}

代码示例来源：origin: org.ops4j.pax.logging/pax-logging-service

private void clearDelegateContext()
{
  m_service.getConfigLock().readLock().unlock();
  if( MDC.getContext() != null )
  {
    MDC.getContext().clear();
  }
}

代码示例来源：origin: org.slf4j/slf4j-log4j12

/**
 * 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. Log4j does <em>not</em>
 * support null for the <code>val</code> parameter.
 * 
 * <p>
 * This method delegates all work to log4j's MDC.
 * 
 * @throws IllegalArgumentException
 *             in case the "key" or <b>"val"</b> parameter is null
 */
public void put(String key, String val) {
  org.apache.log4j.MDC.put(key, val);
}

代码示例来源：origin: org.slf4j/slf4j-log4j12

public void remove(String key) {
  org.apache.log4j.MDC.remove(key);
}

代码示例来源：origin: apache/knox

@Override
public CorrelationContext detachContext() {
 CorrelationContext context = (CorrelationContext) MDC.get( MDC_CORRELATION_CONTEXT_KEY );
 MDC.remove( MDC_CORRELATION_CONTEXT_KEY );
 return context;
}

代码示例来源：origin: hibernate/hibernate-orm

@SuppressWarnings("unchecked")
public Map<String, Object> getMdcMap() {
  return MDC.getContext();
}

代码示例来源：origin: org.slf4j/slf4j-log4j12

public String get(String key) {
  return (String) org.apache.log4j.MDC.get(key);
}

代码示例来源：origin: hibernate/hibernate-orm

@Override
public void clearMdc() {
  MDC.clear();
}

代码示例来源：origin: log4j/log4j

/**
  Returns the the context corresponding to the <code>key</code>
  parameter. If there is a local MDC copy, possibly because we are
  in a logging server or running inside AsyncAppender, then we
  search for the key in MDC copy, if a value is found it is
  returned. Otherwise, if the search in MDC copy returns a null
  result, then the current thread's <code>MDC</code> is used.
  
  <p>Note that <em>both</em> the local MDC copy and the current
  thread's MDC are searched.
*/
public
Object getMDC(String key) {
 Object r;
 // Note the mdcCopy is used if it exists. Otherwise we use the MDC
 // that is associated with the thread.
 if(mdcCopy != null) {
  r = mdcCopy.get(key);
  if(r != null) {
   return r;
  }
 }
 return MDC.get(key);
}

代码示例来源：origin: ops4j/org.ops4j.pax.logging

private void clearDelegateContext()
{
  m_service.getConfigLock().readLock().unlock();
  if( MDC.getContext() != null )
  {
    MDC.getContext().clear();
  }
}

代码示例来源：origin: Alluxio/alluxio

@Override
 public int decide(LoggingEvent event) {
  MDC.put(REMOTE_LOG_MDC_PROCESS_TYPE_KEY, mProcessType);
  return ACCEPT;
 }
}

代码示例来源：origin: hibernate/hibernate-orm

public void removeMdc(String key) {
  MDC.remove( key );
}

代码示例来源：origin: org.apache.knox/gateway-util-common

@Override
public CorrelationContext detachContext() {
 CorrelationContext context = (CorrelationContext) MDC.get( MDC_CORRELATION_CONTEXT_KEY );
 MDC.remove( MDC_CORRELATION_CONTEXT_KEY );
 return context;
}

代码示例来源：origin: org.slf4j/slf4j-log4j12

@SuppressWarnings({ "rawtypes", "unchecked" })
public Map getCopyOfContextMap() {
  Map old = org.apache.log4j.MDC.getContext();
  if (old != null) {
    return new HashMap(old);
  } else {
    return null;
  }
}

代码示例来源：origin: hibernate/hibernate-orm

public Object getMdc(String key) {
  return MDC.get( key );
}