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 | Half-Sync/Half-Async | half-sync-half-async | /patterns/half-sync-half-async/ | Concurrency |
|
Intent
The Half-Sync/Half-Async pattern decouples synchronous I/O from asynchronous I/O in a system to simplify concurrent programming effort without degrading execution efficiency.
Applicability
Use Half-Sync/Half-Async pattern when
- a system possesses following characteristics:
- the system must perform tasks in response to external events that occur asynchronously, like hardware interrupts in OS
- it is inefficient to dedicate separate thread of control to perform synchronous I/O for each external source of event
- the higher level tasks in the system can be simplified significantly if I/O is performed synchronously.
- one or more tasks in a system must run in a single thread of control, while other tasks may benefit from multi-threading.