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> open System.IO;; > File.WriteAllLines("test1.txt", [| "Daisy, Daisy"; "Give me your hand oh do" |]);; val it : unit = () > File.WriteAllLines("test2.txt", [| "I'm a little teapot"; "Short and stout" |]);; val it : unit = () > let chooser = new LineChooser ("test1.txt", "test2.txt");; val chooser : LineChooser > chooser.GetLine();; val it : string = "Daisy, Daisy" > chooser.GetLine();; val it : string = "I'm a little teapot" > (chooser :> IDisposable).Dispose();; val it : unit = () > chooser.GetLine();; System.ObjectDisposedException: Cannot read from a closed TextReader. Disposal should leave an object in an unusable state, as shown in the last line of the previous example. It s also common for objects to implement a member with a more intuitive name that does precisely the same thing as its implementation of IDisposable.Dispose, which is CloseAll in Listing 8-6.

Summary

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If you re writing a component that explicitly wraps some kind of unmanaged resource, then implementing IDisposable is a little trickier. Listing 8-7 shows the pattern that is used for this cleanup. Here, you mimic an external resource via a data structure that generates fresh, reclaimable integer tickets. The idea is that customers are each given an integer ticket, but this is kept internal to the customer, and customers return their ticket to the pool when they leave (that is, are disposed). Listing 8-7. Reclaiming Unmanaged Tickets with IDisposable open System type TicketGenerator() = let mutable free = [] let mutable max = 0 member h.Alloc() = match free with | [] -> max <- max + 1; max | h::t -> free <- t; h member h.Dealloc(n:int) = printfn "returning ticket %d" n free <- n :: free

The Internet has become crucial to our lives as a means of communicating with our friends, family and colleagues. As we ve shown, securing our web browsers and e-mail from possible attackers by encrypting our communications is critical for maintaining our identities and financial information in this digital age. In the next chapter, we ll discuss the controversial topic of malware as it relates to Macs and how to combat this threat to Mac OS X.

let ticketGenerator = new TicketGenerator() type Customer() = let myTicket = ticketGenerator.Alloc() let mutable disposed = false let cleanup() = if not disposed then disposed <- true ticketGenerator.Dealloc(myTicket) member x.Ticket = myTicket interface IDisposable with member x.Dispose() = cleanup(); GC.SuppressFinalize(x) override x.Finalize() = cleanup() Note that you override the Object.Finalize method. This makes sure cleanup occurs if the object isn t disposed but is still garbage-collected. If the object is explicitly disposed, you call GC.SuppressFinalize() to ensure that the object isn t later finalized. The finalizer shouldn t call the Dispose() of other managed objects, because they have their own finalizers if needed. The following example session generates some customers, and tickets used by some of the customers are automatically reclaimed as they exit their scopes: > let bill = new Customer();; val bill : Customer > bill.Ticket;; val it : int = 1 > begin use joe = new Customer() printfn "joe.Ticket = %d" joe.Ticket end;; joe.Ticket = 2 returning ticket 2 > begin use jane = new Customer() printfn "jane.Ticket = %d" jane.Ticket end;; jane.Ticket = 2 returning ticket 2 val it : unit = () In the example, Joe and Jane get the same ticket. Joe s ticket is returned at the end of the scope where the joe variable is declared because of the IDisposable cleanup implicit in the use binding.

In this chapter, we will discuss protecting your Mac from malware. But first, what do we mean by malware Malware is a term used by security professionals to reference any software that is designed to infiltrate or damage computer systems without the owner s informed consent. Informed is the key word here. A user might consent by clicking an Accept dialog box to allow a software package to install, but might not be fully informed of the vulnerabilities that can potentially be exploited by that software package. Beta versions of new software can sometimes have potentially damaging effects on an operating system, but would not be considered malware because they generally don t intend to harm the operating system (intend the operative word here). What we will explore in this chapter are the ill effects that can arise from unintentionally installed software on a Mac, and how to safeguard your machine from them.

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