Class: IdentityCache::CacheFetcher

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(cache_backend) ⇒ CacheFetcher

Returns a new instance of CacheFetcher.


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# File 'lib/identity_cache/cache_fetcher.rb', line 5

def initialize(cache_backend)
  @cache_backend = cache_backend
end

Instance Attribute Details

#cache_backendObject

Returns the value of attribute cache_backend


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# File 'lib/identity_cache/cache_fetcher.rb', line 3

def cache_backend
  @cache_backend
end

Instance Method Details

#clearObject


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# File 'lib/identity_cache/cache_fetcher.rb', line 17

def clear
  @cache_backend.clear
end

#delete(key) ⇒ Object


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# File 'lib/identity_cache/cache_fetcher.rb', line 13

def delete(key)
  @cache_backend.write(key, IdentityCache::DELETED, :expires_in => IdentityCache::DELETED_TTL.seconds)
end

#fetch(key) ⇒ Object


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# File 'lib/identity_cache/cache_fetcher.rb', line 27

def fetch(key)
  result = nil
  yielded = false
  @cache_backend.cas(key) do |value|
    yielded = true
    unless IdentityCache::DELETED == value
      result = value
      break
    end
    result = yield
    break unless IdentityCache.should_fill_cache?
    result
  end
  unless yielded
    result = yield
    add(key, result)
  end
  result
end

#fetch_multi(keys, &block) ⇒ Object


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# File 'lib/identity_cache/cache_fetcher.rb', line 21

def fetch_multi(keys, &block)
  results = cas_multi(keys, &block)
  results = add_multi(keys, &block) if results.nil?
  results
end

#write(key, value) ⇒ Object


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# File 'lib/identity_cache/cache_fetcher.rb', line 9

def write(key, value)
  @cache_backend.write(key, value) if IdentityCache.should_fill_cache?
end