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The way in which you add validation depends on the specific technology you might employ to create the model and to persist it. Attribute-based validation blocks, such as data annotations in the Microsoft .NET Framework 4, are popular. However, they aren t always as effective as one might expect when you have to deal with extremely dynamic rules, or even rules that some users can enter or modify on the fly. A much more flexible approach is to write your own infrastructure that can get input data preferably from outside of the code (for example, from configuration files). In any case, you need to have, or to offer, an API for checking whether a given object is in a valid state. In addition, the validation block must be able to report why a given object is not valid. Let s go through an example of a custom server-side validation layer similar to what I discussed in 6.

Introduction to Exchange Server 2010 Mailbox Services . . . . . . . . . . . . . . 259 Exchange Mailbox Services Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . .260 Database Files The Exchange Services

261 264

7

What Is New in Exchange Server 2010 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .265 Large Mailboxes Deleted Item Recovery and Dumpster 2.0 Discontinuation of Storage Groups Performance Improvements 265 266 268 269

The public API for a custom validation layer is typically incorporated in all objects in the domain. This can be done by defining an interface and implementing that in a base class. As you did in 6, you can have an interface like this:

Exchange Mailbox Services Configuration . . . . . . . . . . . . . . . . . . . . . . . . . .279 Determining the Number of Mailboxes for Each Server Determining Where to Host Mailboxes Database Maintenance Mailbox Limits Configuring Deleted Item Recovery Quotas Poison Mailbox Detection and Correction Client Configuration Configuring Public Folders 281 283 283 286 288 288 290 291

Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .295

interface ISupportValidation { bool IsValid{get;} ValidationResults Validate(); }

7

Considering Firewall Ports Planning and Configuring Edge Synchronization Edge Transport Configurations

298 299 304

The ValidationResults type is a collection of objects that contains a report about the detected error. The report typically includes the object that was validated, any error message, perhaps a tag for the purpose of categorization, and a reference to the object that validated the instance of the domain object. If you create your own library, the details of the class are up to you. If you opt for Enterprise Library as the infrastructure for defining and checking business rules, you find such a class there and ready to use. The following code shows a possible custom implementation:

texture = (tex0); mipfilter = LINEAR; }; float2 sample_2D(float2 tex : TEXCOORD0) : COLOR { return tex2D(s_2D, tex); }

Planning for Anti-Spam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313 How Exchange 2010 Does Spam Filtering How Anti-Spam Updates Work Enable Anti-Spam on Hub Transport Servers Connection Filtering Sender Filtering Recipient Filtering Sender ID Filtering Content Filtering Sender Reputation Filtering Attachment Filtering Anti-Spam Reporting 314 315 318 318 321 321 322 325 329 331 332

Antivirus Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .334 Exchange Server 2010 Antivirus Protection Considerations for Deploying an Antivirus Solution Using Forefront Protection 2010 for Exchange Server 334 334 335