Class: Dry::Effects::Effects::Cache

Inherits:
Module
  • Object
show all
Defined in:
lib/dry/effects/effects/cache.rb

Defined Under Namespace

Classes: CacheEffect

Instance Method Summary collapse

Constructor Details

#initialize(scope = nil, shared: false, **kw) ⇒ Cache

Returns a new instance of Cache.



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# File 'lib/dry/effects/effects/cache.rb', line 11

def initialize(scope = nil, shared: false, **kw)
  super()

  if !kw.empty?
    scope, as = kw.to_a[0]
  elsif scope.is_a?(::Hash)
    scope, as = scope.to_a[0]
  else
    as = :cache
  end

  fetch_or_store = CacheEffect.new(
    type: :cache,
    name: :fetch_or_store,
    scope: scope
  )

  key = key(shared)

  module_eval do
    Array(as).each do |meth|
      define_method(meth) do |*args, &block|
        if block
          eff = fetch_or_store.(key.(self, args), block)
        else
          eff = fetch_or_store.(key.(self, args, method: meth), -> { super(*args) })
        end

        ::Dry::Effects.yield(eff)
      end
    end
  end
end

Instance Method Details

#cache_key(instance, args, method: Undefined) ⇒ Object 



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# File 'lib/dry/effects/effects/cache.rb', line 61

def cache_key(instance, args, method: Undefined)
  if Undefined.equal?(method)
    [instance, args]
  else
    [instance, method, args]
  end
end

#key(shared) ⇒ Object 



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# File 'lib/dry/effects/effects/cache.rb', line 45

def key(shared)
  if shared
    method(:shared_cache_key)
  else
    method(:cache_key)
  end
end

#shared_cache_key(_, args, method: Undefined) ⇒ Object 



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# File 'lib/dry/effects/effects/cache.rb', line 53

def shared_cache_key(_, args, method: Undefined)
  if Undefined.equal?(method)
    args
  else
    [method, args]
  end
end