Enterprise Library Test Guide - Willy .Net

Testing the Application Block 33
Code test case Implemented? Feature that is implemented
Verify that the application
block operations, such as
the Add and Remove methods
enforce a strong exception
guarantee. This means
that if an operation fails,
the state of the cache rolls
back to what it was before
the attempted operation.
Yes
The CacheManager class has an internal reference
to a Cache object. This object guarantees
exception-safe caching operations. For example,
if an exception occurs during an add operation,
the state of the cache rolls back to what it was
before the attempted operation. This is shown
in the following code example.
public void Add(…)
{
try
{
…
backingStore.
Add(newCacheItem);
inMemoryCache[key] = cacheItemBefore-
Lock;
}
catch
{
backingStore.Remove(key);
inMemoryCache.Remove(key);
throw;
}
}
continued