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 | Event-based Asynchronous | event-asynchronous | /patterns/event-asynchronous/ | Concurrency |
|
Intent
The Event-based Asynchronous Pattern makes available the advantages of multithreaded applications while hiding many of the complex issues inherent in multithreaded design. Using a class that supports this pattern can allow you to:
- Perform time-consuming tasks, such as downloads and database operations, "in the background," without interrupting your application.
- Execute multiple operations simultaneously, receiving notifications when each completes.
- Wait for resources to become available without stopping ("hanging") your application.
- Communicate with pending asynchronous operations using the familiar events-and-delegates model.
Applicability
Use the Event-based Asynchronous pattern(s) when
- Time-consuming tasks are needed to run in the background without disrupting the current application.