layout	title	folder	permalink	categories	tags
pattern	Caching	caching	/patterns/caching/	Behavioral	Performance

Intent

To avoid expensive re-acquisition of resources by not releasing the resources immediately after their use. The resources retain their identity, are kept in some fast-access storage, and are re-used to avoid having to acquire them again.

Class diagram

Applicability

Use the Caching pattern(s) when

• Repetitious acquisition, initialization, and release of the same resource causes unnecessary performance overhead.

Credits

• Write-through, write-around, write-back: Cache explained
• Read-Through, Write-Through, Write-Behind, and Refresh-Ahead Caching
• Cache-Aside