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Summary
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Serviced components are created by inheriting from System.EnterpriseServices.Ser vicedComponent. Interaction with Enterprise Services is managed by adorning classes and meth ods with attributes that contain metadata. Distributed transaction management is the most frequently used service offered by Enterprise Services. System.Transactions offers a separate programming model for managing transac tions. The LTM escalates the transaction to a distributed transaction if and when required. Consuming a serviced component is no different than calling a method, prop erty, or event on a regular external type. Security through Enterprise Services can be managed externally, separate from the domain roles, using the Component Services management console.
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Key Terms
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Component Services management console Lightweight Transaction Manager Microsoft Distributed Transaction Coordinator transaction isolation levels
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12 Review
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Case Scenario
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In the following case scenarios you apply what you ve learned about how to use ser viced components. You can find answers to these questions in the Answers section at the end of this book.
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Case Scenario 1: Reliability Through Transactions
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Interviews
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Following is a list of company personnel interviewed and their statements.
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IT Department Head
We have recently seen a big increase in the load on our application server and suddenly we find that orders seem to go missing. Our sales system shows that the order was accepted from the Web site, but the order to ship never entered the shipping system. Current code that seemed to work fine under low server load appears to be less reliable as load increases. I think we don t manage our transactions right, the original code was completed under severe time constraints, and I don t believe we re using distributed transactions. We need to evaluate our code and fix our transaction problem.
Lead Business Analyst
We need to be able to rely on data integrity across the var ious systems we have in play. Right now we are sending invoices for orders in our sales system, but we never ship. We re losing customers. This is unacceptable! Every customer lost is loss of face, and, on the Internet, the bad experi ences of customers spread like wildfire. What might look like only two or three unhappy customers can turn into the downfall of our online store at the drop of a hat. Fix it!
CIO
Questions
Answer the following questions for your manager: 1. Do our data stores support transactions 2. Do we have the application logic for the online store running on a separate machine from the actual Web pages 3. How can changes be made to the application logic that will make it more reliable
12 Review
Case Scenario 2: Optimizing Performance
Interviews
Following is a list of company personnel interviewed and their statements.
IT Department Head
Our application runs great in the test environment, with a limited amount of users. The server loads seem a little high, but we never wor ried about it too much. In a production environment with many more users, the application grinds to a halt. We need to support more users.
Lead Business Analyst CIO
We spend all this money on developing this system. Surely it can t be that hard to improve the performance.
Questions
Answer the following questions for your manager: 1. Are you using object pooling 2. Is the component designed to be stateless If so, are you using JIT activation
Suggested Practices
To successfully master the objectives covered in this chapter, complete the following tasks.
Create, Configure, and Access a Serviced Component
The following two practices let you implement a serviced component without the aid of a step-by-step tutorial. Try it to test yourself on how well you ve understood the material.
Practice 1
Create a class that inherits from ServicedComponent. Make use of object pooling service in Enterprise Services. Create a console client that tries to create more objects than are configured in your pool. Use the Component Ser vices management console to monitor the result.
12 Review
Practice 2
Create a class that inherits from ServicedComponent. Set the class to require a transaction using the Transaction attribute. Implement a method that inserts data in two separate databases. Use the AutoComplete attribute on the method. Create a console application to run the code. Now adjust the code to make the method throw an exception after inserting data. Look at the transac tion statistics in the Component Services management console.
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