2015-10-28 23:55:47 +08:00
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---
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layout: pattern
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title: Caching
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folder: caching
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permalink: /patterns/caching/
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2016-08-30 15:10:34 +02:00
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pumlid: DSRB4OKm2030LhG0m_rrWyWaE0bc-6ZxpujxsbMKUXwSrfSMCVq7OFYKAj5oJsUZIuCr2bq3fEU3WGOdthWTx59rcnZ1fWu3_GqGKXEjm47VIzeeCqV_0m00
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2015-10-28 23:55:47 +08:00
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categories: Other
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tags:
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- Java
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2015-12-28 15:52:44 +02:00
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- Difficulty-Intermediate
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2015-12-28 16:07:43 +02:00
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- Performance
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2015-10-28 23:55:47 +08:00
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---
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2016-01-03 21:14:30 +01:00
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## Intent
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To avoid expensive re-acquisition of resources by not releasing
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2015-10-28 23:55:47 +08:00
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the resources immediately after their use. The resources retain their identity, are kept in some
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fast-access storage, and are re-used to avoid having to acquire them again.
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2016-01-03 21:14:30 +01:00
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## Applicability
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Use the Caching pattern(s) when
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2015-10-28 23:55:47 +08:00
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* Repetitious acquisition, initialization, and release of the same resource causes unnecessary performance overhead.
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2016-01-03 21:14:30 +01:00
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## Credits
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2015-10-28 23:55:47 +08:00
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* [Write-through, write-around, write-back: Cache explained](http://www.computerweekly.com/feature/Write-through-write-around-write-back-Cache-explained)
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* [Read-Through, Write-Through, Write-Behind, and Refresh-Ahead Caching](https://docs.oracle.com/cd/E15357_01/coh.360/e15723/cache_rtwtwbra.htm#COHDG5177)
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