Most of this rather slim book focusses on the “typed event channel” design pattern.

However, it is a really good pattern.

Highly motivated readers will also go and seek out information on the ValueModel feature of the PARC Place systems VisualWorks. It is programmed in SmallTalk, so the implementation will not interest most programmers. However, the architecture – the design patterns – are really cool.

And they fit in nicely with the one described in this book.