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OK, let s go back and have a look at that log function. As we noted earlier, it isn t very useful right now. We can improve it by logging the name of the file we have processed after each output stage, to help the production team diagnose problems. Example 5-19 shows an update to the Main function to do that.
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static void Main(string[] args) { Document doc1 = new Document { Author = "Matthew Adams", DocumentDate = new DateTime(2000, 01, 01), Text = "Am I a year early " }; Document doc2 = new Document { Author = "Ian Griffiths", DocumentDate = new DateTime(2001, 01, 01), Text = "This is the new millennium, I promise you." }; Document doc3 = new Document { Author = "Matthew Adams", DocumentDate = new DateTime(2002, 01, 01), Text = "Another year, another document." }; string documentBeingProcessed = null; DocumentProcessor processor = Configure(); processor.LogTextProvider = (doc => documentBeingProcessed); documentBeingProcessed = "(Document 1)"; processor.Process(doc1); Console.WriteLine(); documentBeingProcessed = "(Document 2)"; processor.Process(doc2); Console.WriteLine(); documentBeingProcessed = "(Document 3)"; processor.Process(doc3); } Console.ReadKey();
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We added a third document to the set, just so that we can see more get processed. Then we set up a local variable called documentBeingProcessed. As we move through the documents we update that variable to reflect our current status. How do we get that information into the lambda expression Simple: we just use it!
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Compile and run that code, and you ll see the following output:
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The processing will not succeed. (Document 1) Document traduit. (Document 2) Spellchecked document. (Document 2) Repaginated document. (Document 2) Highlighting 'millennium' (Document 2) Document traduit. (Document 3) Spellchecked document. (Document 3) Repaginated document. (Document 3)
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We took advantage of the fact that an anonymous method has access to variables declared in its parent scope, in addition to anything in its own scope. For more information about this, see the sidebar below.
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Closures
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In general, we call an instance of a function and the set of variables on which it operates a closure. In a pure functional language, a closure is typically implemented by taking a snapshot of the values of the variables at the time at which the closure is created, along with a reference to the function concerned, and those values are immutable. In C#, a similar technique is applied but the language allows us to modify those variables after the closure has been created. As we see in this chapter, we can use this to our advantage, but we have to be careful to understand and manage the scope of the variables in the closure to avoid peculiar side effects.
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We ve seen how to read variables in our containing scope, but what about writing back to them That works too. Let s create a process counter that ticks up every time we execute a process, and add it to our logging function (see Example 5-20).
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static void Main(string[] args) { // ... (document setup) DocumentProcessor processor = Configure();
string documentBeingProcessed = "(No document set)"; int processCount = 0; processor.LogTextProvider = (doc => { }); documentBeingProcessed = "(Document 1)"; processor.Process(doc1); Console.WriteLine(); documentBeingProcessed = "(Document 2)"; processor.Process(doc2); Console.WriteLine(); documentBeingProcessed = "(Document 3)"; processor.Process(doc3); Console.WriteLine(); Console.WriteLine("Executed " + processCount + " processes."); } Console.ReadKey(); processCount += 1; return documentBeingProcessed;
We added a processCount variable at method scope, which we initialized to zero. We ve switched our lambda expression into the statement form with the braces so that we can write multiple statements in the function body. In addition to returning the name of the document being processed, we also increment our processCount. Finally, at the end of processing, we write out a line that tells us how many processes we ve executed. So our output looks like this:
The processing will not succeed. (Document 1) Document traduit. (Document 2) Spellchecked document. (Document 2) Repaginated document. (Document 2) Highlighting 'millennium' (Document 2) Document traduit. (Document 3) Spellchecked document. (Document 3) Repaginated document. (Document 3) (Document 3) Executed 9 processes.
OK, our production team is very happy with all of that, but they have another requirement. Apparently, they have one team working on some diagnostic components that
are going to track the time taken to execute some of their processes, and another team developing some real-time display of all the processes as they run through the system. They want to know when a process is about to be executed and when it has completed so that these teams can execute some of their own code. Our first thought might be to implement a couple of additional callbacks: one called as processing starts, and the other as it ends; but that won t quite meet their needs they have two separate teams who both want, independently, to hook into it. We need a pattern for notifying several clients that something has occurred. The .NET Framework steps up with events.
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