9.2 Model Implementation Using Reaction
The concurrency model used when implementing the application model within the Reaction framework is well defined. All callback execution is carried out within the context of the main reactor thread, with long running tasks being farmed out to a worker thread pool and completing via the standard callback mechanism. This essentially eliminates the need for synchronisation, since all object state updates which rely on callbacks will execute atomically within the main reactor thread.
Although the core application code can take advantage of this clean concurrency model, complications are introduced the Reaction framework is used in conjunction with an independent GUI event loop. In order to address these problems, there are some common techniques which are useful when implementing the model's interface to the view and controller components.
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