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By design, a service layer is made of coarse-grained methods that map to UI functions. This is to say that from an action method you can easily find a matching method to call on the service layer. In this case, your action method clearly plays the role of the coordinator which is the most desirable option from a testing and maintenance perspective. If you implement the Repository pattern, or if you just expose the native persistence interface (for example, Entity Framework s ObjectContext object), you end up with an action method that plays the role of the controller. It incorporates all the logic necessary to perform the task. Here s a code snippet if you have direct access to the persistence layer:

In addition to normal IT best practices and redundant hardware, the DAG is the primary high-availability option for Exchange 2010 Mailbox servers. A DAG is a collection of servers that provides continuous replication and availability for mailbox databases, as shown in Figure 11-1.

Continuous replication creates a passive database copy on another Mailbox server in the DAG, and then uses asynchronous log shipping to maintain the copies. The continuous replication process follows these steps:

1. 2.

[AcceptVerbs(HttpVerbs.Post)] public ActionResult Update(Customer customer) { // Get the entity model handle MyAppEntities context = new MyAppEntities(); // Apply changes // This pseudo-syntax is based on features in Entity Framework 4 context.Customers.ApplyChanges(customer, ...); // Save to storage context.SaveChanges(); // Back to the Edit view return View("Edit"); }

The active transaction log is written and then closed. The Microsoft Exchange Replication service replicates the closed log to servers hosting the passive database copies.

Because each copy of the database is identical, the Log Inspector will examine the transaction logs for the following: Verifies the physical integrity of the transaction log Verifies that the header generation is not higher than the highest generation for the current database copy Verifies the log header matches the generation of the file name Verifies the log file signature in the header matches the log file The transaction log is then placed in the defined transaction log directory.

// Check that the device supports at least one of the two techniques // used in this sample: either a vertex shader or at least two blend // matrices and a directional light if( (dwBehavior & D3DCREATE_HARDWARE_VERTEXPROCESSING ) || (dwBehavior & D3DCREATE_MIXED_VERTEXPROCESSING ) ) { if( pCaps->VertexShaderVersion >= D3DVS_VERSION(2,0) ) return S_OK; } else { // Software vertex processing always supports vertex shaders. return S_OK; }

A solution in which the action method gains direct access to the persistence layer results in intrinsically more coupled code that can get even worse as the complexity grows. You clearly see that, in this case, the action method is directing activities and making any decisions required for the task to perform its duties. Let s consider the Repository pattern using an update scenario. If you have implemented the Repository pattern, your update action code will look like this:

The Information Store then validates the transaction log and then applies the logs to the database copy The databases remain in sync Requires the Windows failover clustering feature and uses an Enterprise version of Windows server (Windows Server 2008 or Windows Server 2008 R2), although the installation and configuration tasks occur with the Exchange Server management tools Exchange Server does not use Windows failover clustering to handle database failover Instead, it uses Active Manager to manage the failover process Members must have the same operating system You can add up to 16 servers to a single DAG and create up to 16 copies of a database Up to 100 databases can be mounted as either a passive or active copy of the database on each server in the DAG Uses an evolution of the continuous replication technology that is available in Exchange 2007.