Enterprise Library Test Guide - Willy .Net

76
Enterprise Library Test Guide
Code test case
Verify that the application
block supports post
handling actions such as
None, NotifyRethrow, and
ThrowNewException after
it executes the exception
handlers.
Verify that the application
block uses the Logging
Application Block to log the
exceptions.
Verify that the performance
counters and the event log
that are required by the application
block are installed
during installation.
Implemented?
Yes
Yes
Yes
Feature that is implemented
The ExceptionPolicyEntry class executes the exception
handlers for the given exception. This class
contains a method named Handle that calls the private
method RethrowRecommended. This method executes
the post handling action. This is shown in the
following code example.
private bool RethrowRecommended(Exception
chainException, Exception originalException)
{
if (postHandlingAction == PostHandlingAction.
None) return false;
if (postHandlingAction == PostHandlingAction.
ThrowNewException)
{
throw IntentionalRethrow(chainException,
originalException);
}
return true;
}
The LoggingExceptionHandler class logs the exceptions.
This class has a method named WriteToLog that
uses an instance of the Logging Application Block’s
LogWriter class. This is shown in the following code
example.
public class LoggingExceptionHandler : IExceptionHandler
{
private readonly LogWriter logWriter;
protected virtual void WriteToLog(string log-
Message, IDictionary exceptionData)
{
this.logWriter.Write(entry);
}
}
For example, the ExceptionHandlingInstrumentation-
Listener class contains the installer attribute type
[HasInstallableResourcesAttribute]. The EventLogInstallerBuilder
and the PerformanceCounterInstaller-
Builder installer classes, which are in the Enterprise
Library Core, recognize this attribute and install the
performance counters and event logs.