1. Concurrent
Programming in Java
from: NFJS Magazine 2011 March
demo by: Keesun Baik(http//whiteship.me)
email: whiteship2000@gmail.com
present at: G+ Hang Out, 06.12.2011, 10 PM, Seoul

2. Java Concurrency
• There are “Shared Mutable Variables”
• So, “Synchronization” is required.
• Monitor-based Concurrency Model
• http://en.wikipedia.org/wiki/Java_concurrency

3. Software Transaction
Memory
• Remove “Synchronization” by
• Change the “Shared Mutable Object” to
“managed reference”.
• A managed reference is not allowed to
change in an uncontrolled manner.

4. Actor
• Remove “Shared Mutable Object” by
• Encapsulate variables within “Actor”
• “Actors” are run only by one thread at
any time.
• So, there is no “contention”.

5. Sample
• Sequentially call open API.
• Monitor-based call open API.
• STM-based call open API.
• Actor-based call open API.

6. What do you think
about?
• Which way of concurrent programming do
you prefer or looks attractive to you?
• Which logic do you process concurrently?
• What subjects should we learn about?
• Which books do you use to learn
concurrent programming?