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## org.springframework.aop.interceptor
Class PerformanceMonitorInterceptor

    java.lang.Object
      org.springframework.aop.interceptor.AbstractTraceInterceptor
          org.springframework.aop.interceptor.AbstractMonitoringInterceptor
              org.springframework.aop.interceptor.PerformanceMonitorInterceptor

All Implemented Interfaces:
  Serializable, Advice, Interceptor, MethodInterceptor

    public class PerformanceMonitorInterceptor

extends AbstractMonitoringInterceptor

Simple AOP Alliance `MethodInterceptor` for performance monitoring. This interceptor has no effect on the intercepted method call.

Uses a `StopWatch` for the actual performance measuring.

Author:
  Rod Johnson, Dmitriy Kopylenko, Rob Harrop
See Also:
  `StopWatch`, `JamonPerformanceMonitorInterceptor`, Serialized Form

Field Summary

Fields inherited from class org.springframework.aop.interceptor.AbstractTraceInterceptor
`defaultLogger`

Constructor Summary
`PerformanceMonitorInterceptor()` Create a new PerformanceMonitorInterceptor with a static logger.
`PerformanceMonitorInterceptor(boolean useDynamicLogger)` Create a new PerformanceMonitorInterceptor with a dynamic or static logger, according to the given flag.

Method Summary
`protected Object` | `invokeUnderTrace(MethodInvocation invocation, Log logger)` Subclasses must override this method to perform any tracing around the supplied `MethodInvocation`.

Methods inherited from class org.springframework.aop.interceptor.AbstractMonitoringInterceptor
`createInvocationTraceName, getPrefix, getSuffix, setLogTargetClassInvocation, setPrefix, setSuffix`

Methods inherited from class org.springframework.aop.interceptor.AbstractTraceInterceptor
`getClassForLogging, getLoggerForInvocation, invoke, isInterceptorEnabled, isLogEnabled, setHideProxyClassNames, setLoggerName, setUseDynamicLogger`

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

Constructor Detail

### PerformanceMonitorInterceptor

    public PerformanceMonitorInterceptor()

  Create a new PerformanceMonitorInterceptor with a static logger.

### PerformanceMonitorInterceptor

    public PerformanceMonitorInterceptor(boolean useDynamicLogger)

  Create a new PerformanceMonitorInterceptor with a dynamic or static logger, according to the given flag.

  Parameters:
    `useDynamicLogger` - whether to use a dynamic logger or a static logger
  See Also:
    `AbstractTraceInterceptor.setUseDynamicLogger(boolean)`

Method Detail

### invokeUnderTrace

    protected Object invokeUnderTrace(MethodInvocation invocation,
                                      Log logger)
                               throws Throwable

  Description copied from class: `AbstractTraceInterceptor`
  Subclasses must override this method to perform any tracing around the supplied `MethodInvocation`. Subclasses are responsible for ensuring that the `MethodInvocation` actually executes by calling `MethodInvocation.proceed()`.

  By default, the passed-in `Log` instance will have log level "trace" enabled. Subclasses do not have to check for this again, unless they overwrite the `isInterceptorEnabled` method to modify the default behavior.

  Specified by:
    `invokeUnderTrace` in class `AbstractTraceInterceptor`
    `logger` - the `Log` to write trace messages to
  Returns:
    the result of the call to `MethodInvocation.proceed()`
  Throws:
    `Throwable` - if the call to `MethodInvocation.proceed()` encountered any errors
  See Also:
    `AbstractTraceInterceptor.isInterceptorEnabled(org.aopalliance.intercept.MethodInvocation, org.apache.commons.logging.Log)`, `AbstractTraceInterceptor.isLogEnabled(org.apache.commons.logging.Log)`

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