#354 Add maven model for feature toggle design pattern

half-sync-half-async/index.md

@@ -9,13 +9,15 @@ tags:
  - Difficulty-Intermediate
 ---
 
-**Intent:** The Half-Sync/Half-Async pattern decouples synchronous I/O from
+## Intent
+The Half-Sync/Half-Async pattern decouples synchronous I/O from
 asynchronous I/O in a system to simplify concurrent programming effort without
 degrading execution efficiency.
 
 ![Half-Sync/Half-Async class diagram](./etc/half-sync-half-async.png)
 
-**Applicability:** Use Half-Sync/Half-Async pattern when
+## Applicability
+Use Half-Sync/Half-Async pattern when
 
 * a system possesses following characteristics:
   * the system must perform tasks in response to external events that occur asynchronously, like hardware interrupts in OS
@@ -23,13 +25,13 @@ degrading execution efficiency.
   * the higher level tasks in the system can be simplified significantly if I/O is performed synchronously.
 * one or more tasks in a system must run in a single thread of control, while other tasks may benefit from multi-threading.
 
-**Real world examples:**
+## Real world examples
 
 * [BSD Unix networking subsystem](http://www.cs.wustl.edu/~schmidt/PDF/PLoP-95.pdf)
 * [Real Time CORBA](http://www.omg.org/news/meetings/workshops/presentations/realtime2001/4-3_Pyarali_thread-pool.pdf)
 * [Android AsyncTask framework](http://developer.android.com/reference/android/os/AsyncTask.html)
 
-**Credits:**
+## Credits
 
 * [Douglas C. Schmidt and Charles D. Cranor - Half Sync/Half Async](http://www.cs.wustl.edu/~schmidt/PDF/PLoP-95.pdf)
 * [Pattern Oriented Software Architecture Vol I-V](http://www.amazon.com/Pattern-Oriented-Software-Architecture-Volume-Patterns/dp/0471958697)