列了个提纲，一直没有写完。

1. Introduction 1.1 What’s State Machine 1.2 What’s Event Processing

2. Implementation of State Machine 1.1 C style switch/case 1.2 GoF Design Pattern     GoF’s book. 1.3 State Machine Design Pattern with Event     http://angry-architect.blogspot.com/2006/08/problems-with-state-pattern.html 1.4 Java Design Pattern

3. Details 1.1 Special States Ready, End, Abort 1.2 States for error processing 1.3 Special Events Abort, Timeout 1.4 Concurrency Caused by special events. Caused by underlying APIs. Concurreny in a state - intra-state concurrency Concurrent among states - inter-state concurrency 1.5 Coding style Wrapper for underlying APIs Loops in a state Loops among states