Most important, though, no tool can replace conceptual understanding. For example,
determining which exit and entry actions fire in which sequence in a nontrivial state
transition is not something you should discover by running a tool-supported animation
of your state machine. The answer should come from your understanding of the
underlying state machine implementation (discussed in Chapters 3 and 4). Even if
you later decide to use a design automation tool and even if that particular tool would
use a different statechart implementation technique than discussed in this book, you
will still apply the concepts with greater confidence and more efficiency because of
your understanding of the fundamental mechanisms at a low level.
In spite of many pressures from existing users, I persisted in keeping the QP event-
driven platform lean by directly implementing only the essential elements of the bulky
UML specification and supporting the niceties as design patterns. Keeping the core
implementation small and simple has real benefits. Programmers can learn and deploy
QP quickly without large investments in tools and training. They can easily adapt
and customize the framework’s source code to the particular situation, including
to severely resource-constrained embedded systems. They can understand, and indeed
regularly use, all the provided features.
Focus on Real-Life Problems
You can’t just look at state machines and the event-driven framework as a collection of
features, because some of the features will make no sense in isolation. You can only use
these powerful concepts effectively if you are thinking about design, not simply coding.
And to understand state machines that way, you must understand the problems with
event-driven programming in general.
This book discusses event-driven programming problems, why they are problems,
and how state machines and active object computing model can help. Thus, I begin
most chapters with the programming problems the chapter will address. In this way,
I hope to move you, a little at a time, to the point where hierarchical state machines
and the event-driven framework become a much more natural way of solving the
problems than the traditional approaches such as deeply nested
IFs and ELSEs for
coding stateful behavior or passing events via semaphores or event flags of a
traditional RTOS.
state-machine.com
xxx Introduction
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