Enterprise Library Test Guide - Willy .Net

Testing the Logging Application Block 93
Code test case Implemented? Feature that is implemented
Verify that the
application block
uses WMI and
the event log to
monitor and record
errors that occur
during logging
operations, if WMI
and the event log
are enabled.
Yes
If an error occurs while the application block logs an
error message, the application block uses the instrumentation
provider to log exceptions to WMI and to the event
log. In addition, the LogWriter class logs an exception
to the errors special trace source, if it is included in the
configuration file. This is shown in the following code
example.
private void ReportUnknownException(…)
{
try
{
…
structureHolder.ErrorsTraceSource.TraceData(…);
}
catch (Exception ex)
{
instrumentationProvider.FireFailureLoggingErrorEvent(…);
}
}
If the error cannot be logged to the errors special trace
source, the LoggingInstrumentationProvider class raises
the failureLoggingError event. The FailureLoggingError
method consumes the event and logs the exception to
WMI and to the event log. This is shown in the following
code example.
[InstrumentationConsumer("FailureLoggingError"
)]
public void FailureLoggingError(…)
{
if (WmiEnabled) ManagementInstrumentation.
Fire(new LoggingFailureLoggingErrorEvent(…);
if (EventLoggingEnabled)
{
EventLog.WriteEntry(GetEventSourceName(), entryText,
EventLogEntryType.Error);
}
}
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