The 2009 Advent calendar situation


Assume that you have some important object that performs some important task. It may look something like this:

1: public class ImportantObject
2: {
3: public void ImportantMethod()
4: {
5: // Do things.
6: }
7: }

You’ve done everything right and created this object using BDD/TDD but one day everything changes. You need to make this object thread safe. The straight forward way to do this would look like this:

1: public class ImportantObject
2: {
3: private readonly object _lock = new object();
4:  
5: public void ImportantMethod()
6: {
7: lock(_lock)
8: {
9: // Do things.
10: }
11: }
12: }

But that is tricky to drive using specifications/tests, right? So over the next 24 days I’ll show you a few ways to do this and by Christmas eve we should have something nice that works. And I’ll be using xUnit.Net to write the specs/tests.

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