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## org.springframework.web.context.request
Class Log4jNestedDiagnosticContextInterceptor

    java.lang.Object
      org.springframework.web.context.request.Log4jNestedDiagnosticContextInterceptor

All Implemented Interfaces:
  WebRequestInterceptor

    public class Log4jNestedDiagnosticContextInterceptor

extends Object
implements WebRequestInterceptor

Request logging interceptor that adds a request context message to the Log4J nested diagnostic context (NDC) before the request is processed, removing it again after the request is processed.

Since:
  2.5
Author:
  Juergen Hoeller
See Also:
  `NDC.push(String)`, `NDC.pop()`

Field Summary
`protected Logger` | `log4jLogger` Logger available to subclasses

Constructor Summary
`Log4jNestedDiagnosticContextInterceptor()`

Method Summary
`void` | `afterCompletion(WebRequest request, Exception ex)` Removes the log message from the Log4J NDC after the request is processed.
`protected String` | `getNestedDiagnosticContextMessage(WebRequest request)` Determine the message to be pushed onto the Log4J nested diagnostic context.
`protected boolean` | `isIncludeClientInfo()` Return whether or not the session id and user name should be included in the log message.
`void` | `postHandle(WebRequest request, ModelMap model)` Intercept the execution of a request handler after its successful invocation, right before view rendering (if any).
`void` | `preHandle(WebRequest request)` Adds a message the Log4J NDC before the request is processed.
`void` | `setIncludeClientInfo(boolean includeClientInfo)` Set whether or not the session id and user name should be included in the log message.

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

Field Detail

### log4jLogger

    protected final Logger log4jLogger

  Logger available to subclasses

Constructor Detail

### Log4jNestedDiagnosticContextInterceptor

    public Log4jNestedDiagnosticContextInterceptor()

Method Detail

### setIncludeClientInfo

    public void setIncludeClientInfo(boolean includeClientInfo)

  Set whether or not the session id and user name should be included in the log message.

### isIncludeClientInfo

    protected boolean isIncludeClientInfo()

  Return whether or not the session id and user name should be included in the log message.

### preHandle

    public void preHandle(WebRequest request)
                   throws Exception

  Adds a message the Log4J NDC before the request is processed.

  Specified by:
    `preHandle` in interface `WebRequestInterceptor`
  Parameters:
    `request` - the current web request
  Throws:
    `Exception` - in case of errors

### getNestedDiagnosticContextMessage

    protected String getNestedDiagnosticContextMessage(WebRequest request)

  Determine the message to be pushed onto the Log4J nested diagnostic context.

  Default is the request object's `getDescription` result.

  Parameters:
    `request` - current HTTP request
  Returns:
    the message to be pushed onto the Log4J NDC
  See Also:
    `WebRequest.getDescription(boolean)`, `isIncludeClientInfo()`

### postHandle

    public void postHandle(WebRequest request,
                           ModelMap model)
                    throws Exception

  Description copied from interface: `WebRequestInterceptor`
  Intercept the execution of a request handler after its successful invocation, right before view rendering (if any).

  Allows for modifying context resources after successful handler execution (for example, flushing a Hibernate Session).

  Specified by:
    `postHandle` in interface `WebRequestInterceptor`
  Parameters:
    `request` - the current web request
    `model` - the map of model objects that will be exposed to the view (may be `null`). Can be used to analyze the exposed model and/or to add further model attributes, if desired.
  Throws:
    `Exception` - in case of errors

### afterCompletion

    public void afterCompletion(WebRequest request,
                                Exception ex)
                         throws Exception

  Removes the log message from the Log4J NDC after the request is processed.

  Specified by:
    `afterCompletion` in interface `WebRequestInterceptor`
  Parameters:
    `request` - the current web request
    `ex` - exception thrown on handler execution, if any
  Throws:
    `Exception` - in case of errors

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