Enterprise Library Test Guide - Willy .Net

74
Enterprise Library Test Guide
Code test case
Verify that the application
block uses WMI and the
event log to monitor errors
during exception handling
operations when the WMI
and event log are enabled.
Implemented?
Yes
Feature that is implemented
For example, the ExceptionPolicyEntry.Handle method
calls the private method ExecuteHandlerChain to
execute the exception handlers that are defined in the
exception policy. If an exception occurs while the ExecuteHandlerChain
method handles the exceptions, the
FireExceptionHandlingErrorOccurred method notifies
WMI and the event log. The FireExceptionHandlingErrorOccurred
method sends the error message to the
ExceptionHandlingFailureEvent WMI event and logs
the error to the Enterprise Library Exception Handling
event log. This is shown in the following code example.
private Exception ExecuteHandlerChain(Excepti
on ex, Guid handlingInstanceID)
{
try
{
…
ex = handler.HandleException(ex, handlingInstanceID);
}
catch (…)
{
…
InstrumentationProvider.FireExceptionHandlingErrorOccurred(…));
…
}
The ExceptionHandlingInstrumentationProvider class
fires the exceptionHandlingErrorOccured event. The
ExceptionHandlingErrorOccured method consumes
the event and notifies WMI and logs the exception
to the event log. This is shown in the following code
example.
[InstrumentationConsumer("ExceptionHandlingEr
rorOccurred")]
public void ExceptionHandlingErrorOccurred(…)
{
if (EventLoggingEnabled)
{
…
EventLog.WriteEntry(GetEventSourceName(),
entryText, EventLogEntryType.Error);
}
if (WmiEnabled) ManagementInstrumentation.
Fire(new ExceptionHandlingFailureEvent(instan
ceName, e.Message));
}