Declarative Programming in .NET

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Declarative Programming
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You use runtime services by declaring requirements of the component or method with attributes Functionality commonly used with business applications, such as transactions, can be found with the services offered, and you just have to apply an attribute to a class to use a runtime service For example, to use automatic transactions within your component, you just add the attribute [TRansaction (TransactionOptionRequired)] When the component is instantiated, the NET Services automatically start a transaction for you and either commit the transaction when the component is disposed of or roll back the transaction if exceptions occur
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Catalog
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Serviced components must be configured in the NET Enterprise Services metabase With COM, the components had been configured within the registry, and COM+ invented another configuration database with the metabase All the information, such as whether a component takes part in a transaction, supports just-in-time activation, uses queued components, and so on, is written in the metabase A component that is configured in the metabase is known as a configured component Configuration of a NET component inside Enterprise Services can happen dynamically when the client is started or manually by using a registration tool 13 covers the different ways a serviced component can be registered with this database
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Administration
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NET Enterprise Services applications and components can be configured and maintained with the MMC admin tool Component Services, as shown Figure 1-15 You can find this tool by going to the Start menu (Administrative Tools, Component Services) Here you can see all configured applications and components This tool enables you to change the configuration and to see the running instances of the configured components
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Figure 1-15 Component Services Explorer
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Application Services
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Generally, NET Enterprise Services is used because of the services this technology offers, including the following: Automatic transactions Queued components Loosely coupled events Role-based security
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The following sections explain what these major services are and where you can use them
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Automatic Transactions
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One of the most-used features of NET Enterprise Services is automatic transaction management Instead of dealing with transactions programmatically, which implies starting and committing or aborting a transaction, you can use the attribute [transaction] to mark a class requiring automatic transactions With this attribute, a transaction is automatically created and enlisted with the distributed transaction coordinator (DTC) The DTC is a distributed service that is part of the operating system If the method completes successfully, the transaction is committed; otherwise, it is aborted This has the advantage of reducing the code by a few methods However, there is a far bigger advantage with larger applications that use multiple components: Using attributes, you can specify whether a component should take part in an existing transaction and influence its outcome or start a new transaction Only if all objects participating in the transaction are successful is transaction committed If one of these objects fails in task completion, the transaction is rolled back for all objects involved in it (even objects that succeeded but participated in the same transaction) Without these automatic transactions, the client would have to deal with partial outcomes, or it would be necessary to pass the transaction from one method to another Transaction management is a lot easier with automatic transactions The DTC also enables you to distribute transactions across different systems Figure 1-16 shows two NET Enterprise Services applications that access multiple databases A single transaction can span multiple databases from different vendors The database just has to support OLE transactions or an XA-compliant (a two-phase commit) protocol
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Figure 1-16 Transactions spanning multiple databases
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Distributed transactions are covered in 7, "Transaction Services," and in 8, "Compensating Resource Management"
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