Sha256: a8dc7170ecafcfe9b1dfca05de4ac1559a8243d7104528a601d03e95597093b2
Contents?: true
Size: 984 Bytes
Versions: 4
Compression:
Stored size: 984 Bytes
Contents
module Rack
class Component
# A threadsafe, in-memory, per-component cache
class MemoryCache
attr_reader :store, :mutex
# Use a hash to store cached calls and a mutex to make it threadsafe
def initialize(length: 100)
@store = {}
@length = length
@mutex = Mutex.new
end
# Fetch a key from the cache, if it exists
# If the key doesn't exist and a block is passed, set the key
# @return the cached value
def fetch(key)
store.fetch(key) do
set(key, yield) if block_given?
end
end
# Empty the cache
# @return [Hash] the empty store
def flush
mutex.synchronize { @store = {} }
end
private
# Cache a value and return it
def set(key, value)
mutex.synchronize do
store[key] = value
store.delete(@store.keys.first) if store.length > @length
value
end
end
end
end
end
Version data entries
4 entries across 4 versions & 1 rubygems