Enterprise Library Test Guide - Willy .Net

16
Enterprise Library Test Guide
Code test case
Verify that the
Enterprise Library
Core has configuration
watchers that
monitor specific sections
of the external
configuration source.
If there are changes,
these watchers
should notify the
appropriate class to
update the configuration
data.
Verify that there are
methods to properly
dispose of the configuration
watchers
when the watchers
are unregistered
from the configuration
source.
Implemented?
Yes
Yes
Feature that is implemented
The BaseFileConfigurationSourceImplementation class
implements the CreateWatcherForConfigSource method
that adds a watcher. This watcher monitors specific sections
of the external configuration source and notifies the OnExternalConfigurationChanged
method when the configuration
data changes. The OnExternalConfigurationChanged
method then calls the RefreshExternalSections method of
a class that derives from the BaseFileConfigurationSourceImplementation
class to refresh the configuration data
with changes. This is shown in the following code.
private ConfigurationSourceWatcher CreateWatcherFo
rConfigSource(string configSource)
{
…
watcher = new ConfigurationFileSourceWatcher(…
,configSource,…,new ConfigurationChangedEventHandle
r(OnExternalConfigurationChanged));
…
}
In the following code example, the FileConfigurationSourceImplementation
object, which derives from the BaseFile-
ConfigurationSourceImplementation class, refreshes the
configuration data by calling the UpdateCache method.
protected override void RefreshExternalSections(s
tring[] sectionsToRefresh)
{
UpdateCache();
}
The SystemConfigurationSourceImplementation class
derives from the BaseFileConfigurationSourceImplementation
class and implements a method named RemoveConfigSourceWatcher.
This method disposes of the watchers
when they are no longer needed. The same holds true for
the FileConfigurationSourceImpementation class, which
also derives from the BaseFileConfigurationSourceImplementation
class.
The following code example shows how the RemoveConfigSourceWatcher
method disposes of the configuration
watchers.
private void RemoveConfigSourceWatcher(Configuratio
nSourceWatcher watcher)
{
…
(watcher as IDisposable).Dispose();
}