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## org.apache.logging.log4j.core.selector
Class ClassLoaderContextSelector

    java.lang.Object
      org.apache.logging.log4j.core.selector.ClassLoaderContextSelector

All Implemented Interfaces:
  ContextSelector

Direct Known Subclasses:
  BundleContextSelector

    public class ClassLoaderContextSelector

extends Object
implements ContextSelector

This ContextSelector chooses a LoggerContext based upon the ClassLoader of the caller. This allows Loggers assigned to static variables to be released along with the classes that own then. Other ContextSelectors will generally cause Loggers associated with classes loaded from different ClassLoaders to be co-mingled. This is a problem if, for example, a web application is undeployed as some of the Loggers being released may be associated with a Class in a parent ClassLoader, which will generally have negative consequences. The main downside to this ContextSelector is that Configuration is more challenging. This ContextSelector should not be used with a Servlet Filter such as the Log4jServletFilter.

Field Summary
`protected static ConcurrentMap<String,AtomicReference<WeakReference<LoggerContext>>>` | `CONTEXT_MAP`
`protected static org.apache.logging.log4j.status.StatusLogger` | `LOGGER`

Constructor Summary
`ClassLoaderContextSelector()`

Method Summary
`LoggerContext` | `getContext(String fqcn, ClassLoader loader, boolean currentContext)` Returns the LoggerContext.
`LoggerContext` | `getContext(String fqcn, ClassLoader loader, boolean currentContext, URI configLocation)` Returns the LoggerContext.
`protected LoggerContext` | `getDefault()`
`List<LoggerContext>` | `getLoggerContexts()` Returns a List of all the available LoggerContexts.
`void` | `removeContext(LoggerContext context)` Remove any references to the LoggerContext.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### LOGGER

    protected static final org.apache.logging.log4j.status.StatusLogger LOGGER

### CONTEXT_MAP

    protected static final ConcurrentMap<String,AtomicReference<WeakReference<LoggerContext>>> CONTEXT_MAP

Constructor Detail

### ClassLoaderContextSelector

    public ClassLoaderContextSelector()

Method Detail

### getContext

    public LoggerContext getContext(String fqcn,
                                    ClassLoader loader,
                                    boolean currentContext)

  Description copied from interface: `ContextSelector`
  Returns the LoggerContext.

  Specified by:
    `getContext` in interface `ContextSelector`
  Parameters:
    `fqcn` - The fully qualified class name of the caller.
    `loader` - ClassLoader to use or null.
    `currentContext` - If true returns the current Context, if false returns the Context appropriate for the caller if a more appropriate Context can be determined.
  Returns:
    The LoggerContext.

### getContext

    public LoggerContext getContext(String fqcn,
                                    ClassLoader loader,
                                    boolean currentContext,
                                    URI configLocation)

  Description copied from interface: `ContextSelector`
  Returns the LoggerContext.

  Specified by:
    `getContext` in interface `ContextSelector`
  Parameters:
    `fqcn` - The fully qualified class name of the caller.
    `loader` - ClassLoader to use or null.
    `currentContext` - If true returns the current Context, if false returns the Context appropriate for the caller if a more appropriate Context can be determined.
    `configLocation` - The location of the configuration for the LoggerContext.
  Returns:
    The LoggerContext.

### removeContext

    public void removeContext(LoggerContext context)

  Description copied from interface: `ContextSelector`
  Remove any references to the LoggerContext.

  Specified by:
    `removeContext` in interface `ContextSelector`
  Parameters:
    `context` - The context to remove.

### getLoggerContexts

    public List<LoggerContext> getLoggerContexts()

  Description copied from interface: `ContextSelector`
  Returns a List of all the available LoggerContexts.

  Specified by:
    `getLoggerContexts` in interface `ContextSelector`
  Returns:
    The List of LoggerContexts.

### getDefault

    protected LoggerContext getDefault()

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