| layout | pattern |
|---|---|
| title | Callback |
| folder | callback |
| permalink | /patterns/callback/ |
| categories | Other |
| tags | Java |
Intent: Callback is a piece of executable code that is passed as an argument to other code, which is expected to call back (execute) the argument at some convenient time.
Applicability: Use the Callback pattern when
- when some arbitrary synchronous or asynchronous action must be performed after execution of some defined activity.
Real world examples:
- [CyclicBarrier] (http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/CyclicBarrier.html#CyclicBarrier%28int,%20java.lang.Runnable%29) constructor can accept callback that will be triggered every time when barrier is tripped.