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What Workers Shouldn t Do
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Workers should be focused on solving problems related to business logic, without knowledge of how end users initiate a particular task, whether an operation should be carried out synchronously or asynchronously, or what effect a result has on the rest of the system. Within these guidelines, there are a few types of things a worker probably shouldn t get involved with, except under special applicationspecific conditions: Exposed Worker methods shouldn t be asynchronous: Public Worker methods are simpler to develop and test if they are synchronous. If client objects calling a specific method need an asynchronous behavior, the burden of asynchrony should be placed on the client. In practice, the client might use a Coordinator to handle the Worker threading logic. Workers shouldn t deal with thread issues: Workers should not contain logic that interacts with other threads. Workers should not create threads for internal purposes, and they should not contain thread-synchronization logic. Thread-related code belongs in a Coordinator. When firing events, workers should not try to send notifications across thread boundaries. The less a worker knows about threads, the better.
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CHAPTER 10 FUNCTIONAL ROLES
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Workers shouldn t manage transactions: A transaction is a group of tasks that all must succeed or fail collectively. If they succeed, a commit operation is performed, making all the transaction results available at once. If any of the tasks fail, a rollback operation is performed, restoring the system to the state it was in before the transaction started. Normally, you should assign transaction management to a Coordinator, even if the same Worker handles all the tasks. The Coordinator is put in charge of a list of tasks that are part of a transaction. Workers carry out the individual tasks. If all the tasks succeed, the Coordinator commits the changes; otherwise, it rolls the changes back. The commit and rollback operations might be considered tasks themselves and therefore be performed by workers, especially if the details of committing or rolling back changes are business-rule-dependent. Workers shouldn t handle notification routing: Workers should communicate with the rest of the system using notifications exclusively. When using method calls to deliver notifications, workers should use untyped object calls, where possible, to introduce the least amount of run-time coupling possible. To avoid the introduction of extraneous coupling, workers should not be responsible for binding their notifications to event handler methods. A separate Coordinator or a dedicated Binder component should handle binding.
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How Complex Should a Worker Be
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There is obviously no universal answer regarding complexity, but here is a useful guideline: A worker should be as simple as possible, but complex enough to justify the construction of a dedicated test fixture. You can measure complexity in two ways: internally and externally. The internal complexity is related to the amount of logic required to achieve the worker s mission. You might measure this complexity using any number of metrics, including the number of internal classes, the number of lines of code, or function points. The external complexity is related to the footprint of the worker s interface. The interface is represented by methods, properties, and events. A worker might expose only one method externally, but have hundreds of internal ones distributed across dozens of internal classes. This worker part would be internally complex but externally simple. Another worker might expose 50 methods, but have only one class with a total of 50 lines of code. This part would be internally simple but externally complex. The internal complexity affects the level of difficulty to design, implement, and maintain a part. The external complexity affects the level of difficulty to test and integrate a component. How externally complex should a component be The simpler, the better. In the absence of a perfect answer, heuristics are useful. A reasonable one might be what I call the 10-10-10 guideline:4 A worker should not expose more than 10 properties, 10 methods, and 10 events. Most workers don t expose the same number of properties, methods, and events, but the interface footprint should contain 30 items or less. If a worker exposed only methods, it should expose no more than 30. There is nothing magical about the number 30, but workers exposing more than 30 interface items are probably trying to do too much and will be difficult to test and maintain.
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4. Ted Faison, Component-Based Development with Visual C# (Indianapolis, IN: John Wiley & Sons, 2002), p. 40.
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