Intercepting Methods Using GroovyInterceptable
If a Groovy object implements GroovyInterceptable, then its invokeMethod is called when any of its methods are called—both existing methods and nonexistent methods. That is, GroovyInterceptable’s invokeMethod hijacks all calls to the object.
If we want to perform an around advice, we simply implement our logic in this method, and we’re done. However, if we want to implement the before or after advice (or both), we first implement our before/after logic, then route the call to the actual method at the appropriate time. To route the call, we’ll use the MetaMethod for the method we can obtain from the MetaClass (see Querying Methods and Properties).
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