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The final topics we cover in this chapter are the various primitive mechanisms used for threads, shared-memory concurrency, and signaling. In many ways, these are the assembly language of concurrency. In this chapter we ve concentrated mostly on techniques that work well with immutable data structures. That is not to say you should always use immutable data structures. It is, for example, perfectly valid to use mutable data structures as long as they are accessed from only one particular thread. Furthermore, private mutable data structures can often be safely passed through an asynchronous workflow, because at each point the mutable data structure will be accessed by only one thread, even if different parts of the asynchronous workflow are executed by different threads. This does not apply to workflows that use operators such as Async.Parallel or Async.SpawnChild that start additional threads of computation. This means that we ve largely avoided covering shared-memory primitives so far, because F# provides powerful declarative constructs such as asynchronous workflows and message passing that often subsume the need to resort to shared-memory concurrency. However, a working knowledge of thread primitives and shared-memory concurrency is still very useful, especially if you want to implement your own basic constructs or highly efficient concurrent algorithms on shared-memory hardware.

However, there s no way to ensure that the values match other criteria, or that calculations or other processing is done properly against the data, without involving other objects The data in a DataSet, array, or XML document isn t self-aware; it s not able to apply business rules or handle business manipulation or processing of the data The data in a business object, however, is what I like to call smart data The object not only contains the data, but also includes all the business logic that goes along with that data Any attempt to work with the data must go through this business logic In this arrangement, there is much greater assurance that business rules, manipulation, calculations, and other processing will be executed consistently everywhere in the application In a sense, the data has become self-aware, and can protect itself against incorrect usage.

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In this chapter we ve avoided showing how to work with threads directly, instead relying on abstractions such as BackgroundWorker and the .NET thread pool. If you do want to create threads directly, here is a short sample:

So far, we ve been using JavaScript and the DOM to manipulate or create markup. In the next chapter, you re going to see a whole new side to the DOM. It shows you how you can use the DOM to manipulate styles, such as colors, fonts, and so on. Not only can the DOM alter the structure of a web page, it can update the CSS attached to elements in the page!

In the end, an object doesn t care whether it s used by a Windows Forms UI, a batch-processing routine, or a web service The code using the object can do as it pleases; the object itself will ensure that all business rules are obeyed at all times..

open System.Threading let t = new Thread(ThreadStart(fun _ -> printfn "Thread %d: Hello" Thread.CurrentThread.ManagedThreadId)); t.Start(); printfn "Thread %d: Waiting!" Thread.CurrentThread.ManagedThreadId t.Join(); printfn "Done!" When run, this gives the following: val t : Thread Thread 1: Waiting! Thread 10: Hello Done!

Contrast this with a DataSet or an XML document, in which the business logic doesn t reside in the data container, but somewhere else typically, a Windows form or a web form. If multiple forms or pages use this DataSet, there is no assurance that the business logic is applied consistently. Even if you adopt a standard that says that UI developers must invoke methods from a centralized class to interact with the data, there s nothing preventing them from using the DataSet directly. This may happen accidentally, or because it was simply easier or faster to use the DataSet than to go through some centralized routine.

guaranteed way to put obscure concurrency bugs in your program! The MSDN website has a good description of why Thread.Abort may not even succeed. One of the only compelling uses for Thread.Abort is to implement Ctrl+C in an interactive development environment for a general-purpose language such as F# Interactive.

With consistent use of business objects, there s no way to bypass the business logic. The only way to the data is through the object, and the object always enforces the rules.

What this chapter covers: Introducing the style property How to retrieve style information How to change styles In this chapter, the presentation layer and the behavior layer will meet head-on. You ll see how the DOM can be used to get and set styles by reading and writing CSS.

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