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The object model has a RoleList object, responsible for providing a read-only list of role data. It also has a Roles object, responsible for editing the list of roles in the application. While these two objects have very distinct responsibilities, they do have a point of interaction that should be addressed. Though not required by any use case from a user, the RoleList object can, and probably should, be cached. The list of roles won t change terribly often, and yet the RoleList object will be used frequently to populate UI controls and to validate data from the user. There s no sense hitting the database every time to get the same data over and over. You ll see how to easily implement the caching in 8, but first, there s a design issue to consider: what happens when the user edits the list of roles using the Roles object In such a case, the RoleList object will be inaccurate.

In this listing, a permanent true condition starts the loop off, looping until true equals false, which shouldn t ever happen (and if it does, we re all in for a world of hurt). We grab the first message off of the queue and check to see if it s null. If there aren t any messages on the queue, the GetMessage q would return a NULL message. If there is a message, we process it, not deleting it until the real work is fully completed w. If there wasn t a new message retrieved, the loop sleeps for a period of time e, and then tries again. Sometimes you might find that a queue is polled too often. If this is a concern, you can dynamically change the wait time in the bottom of the loop. A common algorithm used in networking is called truncated exponential backoff. You can see an example of how to implement this in listing 16.6. Under this system, each time a queue check doesn t return a message, the loop delay is extended exponentially until a certain ceiling is reached. If the check does return a message, the loop delay is decreased, either back to the lowest setting, or to the next lowest setting in the progression.

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There s a related issue too, which is when another user edits the list of roles. That issue is harder to solve, and requires either periodic cache expiration or some mechanism by which the database can notify the client that the roles have changed. Solving this problem is outside the scope of this discussion.

Base class for all custom principal objects Base class for custom identity objects Interface that a custom identity class can implement so BusinessPrincipalBase knows to delegate IsInRole() to that identity object Data portal factory class containing methods to authenticate credentials against the ASP.NET MembershipProvider; used by MembershipIdentity Base class to assist in using the ASP.NET MembershipProvider to create a custom identity object Criteria class for passing a username and password to a custom identity object Simple subclass of CslaIdentity to provide a generic, unauthenticated identity object Simple subclass of BusinessPrincipalBase to provide a generic, unauthenticated principal object

while (true) { CloudQueueMessage msg = q.GetMessage(); if (msg != null) {

It is relatively trivial to have the Roles object notify RoleList to tell it that the data has changed. In such a case, RoleList can simply invalidate its cache so the data is reloaded on the next request. Again, the implementation of this behavior is shown in 8. From an object model perspective, however, this means that there is interaction between Roles and RoleList. From a CRC perspective, this means that Roles collaborates with RoleList to expire the cache when appropriate.

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