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CHAPTER 7 ENTERPRISE SERVICES
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[Transaction(TransactionOption.Required)] public class CustomerService { public void IncreaseCreditLimit( int customerNum, double increaseAmount) { try { Customer cust = new Customer(customerNum); double max = cust.MaxAllowableCredit; double current = cust.CreditLimit; if (max < current + increaseAmount) { ContextUtil.MyTransactionVote = TransactionVote.Abort; } else { cust.CreditLimit += increaseAmount; cust.Save(); ContextUtil.MyTransactionVote = TransactionVote.Commit; } } catch (Exception ex) { ContextUtil.MyTransactionVote = TransactionVote.Abort; throw new Exception( "Attempt to increase limit failed", ex); } } } It s only necessary to use this option when you do not want to throw exceptions when a component is unable to finish its work. Generally, unless it interferes with a larger errorhandling strategy, you should use the AutoComplete attribute, as this results in much cleaner code overall. Transactions are managed under the hood of COM+ by the Distributed Transaction Coordinator, a separate Windows Service. This service must be running for COM+ transactions to work. It is an expensive resource, and you must make considerations for the overhead your application will incur when you decide to use it. MSDTC is not the only technology available to manage transactions; you should consider other less-expensive options before deciding to go into COM+. A few bars for entry into COM+ for transactional management exist.
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Your transaction spans data sources, especially if it spans different relational databases. For example, if your transaction is moving information from Microsoft SQL Server into an Oracle database, MSDTC is an excellent option for managing the transaction. Your application has complex requirements around transactional composition. In this case, your services are designed to do different, autonomous pieces of work. Transaction coordinators are written that call these different services to accomplish a specific business process. The number of ways these services can be combined is high, or the requirements change and evolve often, and you anticipate introducing new transaction coordinators as newer versions of the product are introduced. Your application has customizable functionality, such that an end user, power user, or administrator has a tool that can affect how services are combined to do transactional work. As a corollary to these guidelines, if you can meet your transactional requirements with another resource manager, your solution will probably perform better. One option may be using transactions within SQL Server Transact-SQL (TSQL). This limits the transaction to a single command execution from your data access code. A stored procedure can call other stored procedures to enlist in the work of the transaction. Another option is to use ADO.NET transactions. These transactions are tied to a connection so that many commands can be executed against a single data store and enlisted in a single transaction. You can use this to dynamically generate SQL or to combine multiple stored procedure calls. These options are not nearly as flexible as COM+ transactions, but they are much better performers; thus, you should leverage them when they can do the job. See 12 for information on the transactional infrastructure built into the .NET Framework 2.0, which gives you options for upgrading transactions dynamically; this way, only the resource managers needed get enrolled on an as-needed basis.
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Queued Components (QC) provide a layer of abstraction between the COM+ developer and MSMQ. Configuring a component as queued gives you all of the benefits of message queuing, including asynchronous method invocation, without having to worry about the underlying details of preparing MSMQ messages and placing them in queues. When a component is configured as queued, a call to the message prompts COM+ to prepare a MSMQ message and place it in a private queue. Another COM+ process acts as a listener to that queue, pulls the message out when it arrives, and invokes the method described by the message (see Figure 7-8). QC provides a fire-and-forget model of service invocation. For this reason, methods that are configured as queued cannot have a return value. The caller does not wait for a return value; instead, the caller continues execution as soon as COM+ prepares the message and gets it into the queue. The actual work the method does occurs asynchronously with whatever code path the caller continues with after the method call.
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