Class: CRUDJT::LRUCache

Inherits:
Object
  • Object
show all
Defined in:
lib/lru_cache.rb

Constant Summary collapse

CACHE_CAPACITY = 
40_000

Instance Method Summary collapse

Constructor Details

#initialize(read_func) ⇒ LRUCache

Returns a new instance of LRUCache.



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# File 'lib/lru_cache.rb', line 7

def initialize(read_func)
  @cache = LruRedux::ThreadSafeCache.new(CACHE_CAPACITY)
  @read_func = read_func
end

Instance Method Details

#delete(token) ⇒ Object 



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# File 'lib/lru_cache.rb', line 69

def delete(token)
  cache.delete(token)
end

#force_insert(token, hash) ⇒ Object 



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# File 'lib/lru_cache.rb', line 65

def force_insert(token, hash)
  cache[token] = hash
end

#get(token) ⇒ Object 



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# File 'lib/lru_cache.rb', line 12

def get(token)
  cached_value = cache[token]

  if cached_value && cached_value[:data]
    cached_value[:data] = MessagePack.unpack(cached_value[:data])
    cached_value['data'] = cached_value.delete(:data)
  end

  if cached_value
    output = {}

    if cached_value.dig('metadata', 'ttl')
      ttl = (cached_value['metadata']['ttl'].to_i - Time.now.to_i).ceil
      if ttl <= 0
        cache.delete(token)
        return
      end

      output['metadata'] = {}
      output['metadata']['ttl'] = ttl
    end

    silence_read = cached_value.dig('metadata', 'silence_read')
    if silence_read
      silence_read = cached_value['metadata']['silence_read'] -= 1
      output['metadata'] ||= {}
      output['metadata']['silence_read'] = silence_read

      cache.delete(token) if silence_read <= 0
    end
    read_func.call(token) if silence_read
    output['data'] = cached_value['data']

    return output
  end
end

#insert(key, value, ttl, silence_read) ⇒ Object 



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# File 'lib/lru_cache.rb', line 49

def insert(key, value, ttl, silence_read)
  hash = { data: value }

  if ttl > 0
    hash['metadata'] = {}
    hash['metadata']['ttl'] = (Time.now + ttl)
  end

  if silence_read > 0
    hash['metadata'] ||= {}
    hash['metadata']['silence_read'] = silence_read
  end

  cache[key] = hash
end