2aa9e78ddd
* Made minor changes in some patterns such as removed throws clause where not needed, changed incorrect order of arguments in assertEquals * Minor refactorings and code style changes. 1) Removed several use of raw types 2) Removed unnecessary throws clauses 3) Used lambda expressions wherever applicable 4) Used apt assertion methods for readability 5) Use of try with resources wherever applicable 6) Corrected incorrect order of assertXXX arguments * Removed unused import from Promise * Addressed review comments * Addressed checkstyle issue
layout, title, folder, permalink, categories, tags
| layout | title | folder | permalink | categories | tags | ||||
|---|---|---|---|---|---|---|---|---|---|
| pattern | Callback | callback | /patterns/callback/ | Other |
|
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 constructor can accept callback that will be triggered every time when barrier is tripped.