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Message queuing has long been a staple of highly scalable and robust systems. It is particularly useful for systems that must integrate disparate applications running on many different platforms, but its flexibility makes it an appealing solution for a wide variety of system scenarios where tasks must be executed asynchronously, correctly, and robustly. So why aren t all distributed architectures based on messaging Because building a messaging infrastructure with enterprise-level features is not a trivial task. In fact, it s plain hard. Messaging products such as MSMQ alleviate the implementation pain, but bring additional costs in terms of administration idiosyncrasies and mastering yet another fairly complex API. For many developers and architects building a small- to medium-sized system, these costs discourage the use of MSMQ and, thus, messaging in general (see 8 for a discussion and examples of MSMQ). On the other hand, the industry is clearly shifting away from the Remote Procedure Call (RPC) and distributed object mindset in favor of messaging. A number of new and forthcoming technologies are enabling this shift by making message-based implementations more palatable in more scenarios. Web Services, BizTalk, and Windows Communication Foundation all treat a message as a first-class citizen rather than a network protocol detail to be abstracted into a method call. And now you can also add SQL Server 2005 s new Service Broker feature to this ever-growing list of messaging tools.

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In the preceding list of methods, an overloaded version of a method without any parameters gives us an entire array, whereas an overloaded version of a method with the parameters index and count gives us a slice of the array. The definition of the method _doUseNumericExtensionsForNumArray() demonstrates how we can retrieve the collection number_varray as an array of int elements: private static void _doUseNumericExtensionsForNumArray( ARRAY array ) throws SQLException { System.out.println("In _doUseNumericExtensionsForNumArray");

ASP.NET comes with a number of built-in application services that you can use and customize as you build your web applications. These encapsulate much of the core functionality common to most websites, such as membership and role management, profiles and personalization, and site navigation, and you can easily plug them into your website logic right out of the box. These services interact with service-specific data (the users registered, the different user roles your site is programmed for, various data associated with the authenticated users, and so on) via providers, which are classes that implement the appropriate interfaces to fulfill contracts for various services. ASP.NET comes with a number of built-in providers; for instance, it has a SQL and an Active Directory membership provider. The provider model allows you to plug in your own providers (simply by specifying them in the appropriate section of your web.config), so you may write an Oracle or a custom membership provider to your existing user/membership database or a role service provider based on simple XML files. Table 14-9 shows some common provider-based services in ASP.NET.

Given the messaging capabilities of existing technologies, a common question surrounding Service Broker is what advantages it has, if any, over traditional messaging implementations such as MSMQ and BizTalk. Fundamentally, the primary difference between Service Broker and most other messaging technologies is its tight integration with a database engine. This provides a number of important benefits. Unified programming model: Service Broker adds message-related objects, such as message, queue, and service, to the standard set of database objects (table, stored procedure, trigger, etc.). It also enhances the T-SQL with the capability to read queues, write queues, and send messages to other Service Broker services. The result is a message programming model that is immediately familiar to database administrators and developers with T-SQL experience. Improved transactional messaging support: Many messaging scenarios call for a client application to perform a transactional read on a message queue. Unfortunately, several messaging infrastructures only support transactional reads on queues that are local to the receiving application. However, Service Broker allows any client, be it local or remote, to perform transactional reads. It also does not need to use expensive twophase commit protocols to implement transactional messaging. Integrated management and operations: An organization s collected data is priceless, so it is usually protected with automated backup procedures and clustered hardware that ensures availability through failover. Since it s part of SQL Server 2005, the Service Broker message infrastructure automatically reaps these benefits.