DualCache

Configurable two-level caching system

How it works

• Items are written to level 1 cache first
• Items that exceed level 1 size limit are moved to level 2
• Items from level 2 are restored to level 1 when accessed
• Items that exceed level 2 size are removed from cache based on strategy provided

Usage

require 'dual_cache'

cache = DualCache::Storage.new(
  strategy: 'most_used',
  l1_size: 1.megabyte,
  l2_size: 256.megabytes
)

cache.write('foo', 'bar') # => true
cache.read('foo') # => 'bar'
cache.delete('foo') # => true
cache.clear # => true

Initialization params hash keys

• strategy: caching strategy (least_used|most_used)
• l1_size: maximum cache size in bytes for l1
• l2_size: maximum cache size in bytes for l2

Testing

$ bundle exec rspec

TODO

• Implement more caching strategies
• Implement various cache storages (e.d. redis, memcached)
• Add coverage