Concurrency Models

• specifies how threads in the the system collaborate to complete the tasks they are are given

shared state concurrency mode

• multiple threads executing within the same application would also share objects.

• causes a lot of concurrency problems which can be hard to solve elegantly.

shared nothing or shared nothing

• the threads do not share any objects or data. This avoids a lot of the concurrent access problems of the shared state concurrency model.

• asynchronous "separate state" platforms and toolkits like Netty, Vert.x and Play / Akka