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Add cache with FIFO replacement policy #6337

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Add cache with FIFO replacement policy #6337

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@KevinMwita7 KevinMwita7 commented Jul 3, 2025 •
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Description

This PR adds a reusable FIFOCache implementation with the following features:

  • Fixed size FIFO eviction policy using LinkedHashMap
  • Time to live (TTL)
  • Thread-safe operations using ReentrantLock
  • Pluggable EvictionStrategy to control expired entry cleanup
  • Eviction listener callback support for observing removals
  • Hit and miss statistics tracking
  • Builder for flexible configuration

Checklist

  • I have read CONTRIBUTING.md.
  • This pull request is all my own work -- I have not plagiarized it.
  • All filenames are in PascalCase.
  • All functions and variable names follow Java naming conventions.
  • All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
  • All new code is formatted with clang-format -i --style=file path/to/your/file.java

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codecov-commenter commented Jul 3, 2025 •
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Codecov Report

Attention: Patch coverage is 94.52055% with 8 lines in your changes missing coverage. Please review.

Project coverage is 74.48%. Comparing base (712ada5) to head (cd4a4f3).

Files with missing lines Patch % Lines
...thealgorithms/datastructures/caches/FIFOCache.java 94.52% 2 Missing and 6 partials ⚠️
Additional details and impacted files 
@@             Coverage Diff              @@
##             master    #6337      +/-   ##
============================================
+ Coverage     74.33%   74.48%   +0.15%     
- Complexity     5392     5423      +31     
============================================
  Files           679      680       +1     
  Lines         18820    18966     +146     
  Branches       3646     3670      +24     
============================================
+ Hits          13990    14127     +137     
- Misses         4274     4276       +2     
- Partials        556      563       +7

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@KevinMwita7 KevinMwita7 marked this pull request as ready for review July 3, 2025 20:39
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@DenizAltunkapan DenizAltunkapan Awaiting requested review from DenizAltunkapan DenizAltunkapan is a code owner

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