Module: Delorean::Functions

Defined in:
lib/delorean/functions.rb

Instance Method Summary collapse

Instance Method Details

#cached_delorean_fn(name, options = {}) ⇒ Object

By default implements a VERY HACKY class-based (per process) caching mechanism for database lookup results. Issues include: cached values are ActiveRecord objects. Query results can be very large lists which we count as one item in the cache. Caching mechanism will result in large processes.



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# File 'lib/delorean/functions.rb', line 25

def cached_delorean_fn(name, options = {})
  delorean_fn(name, options) do |*args|
    delorean_cache_adapter = ::Delorean::Cache.adapter
    # Check if caching should be performed
    next yield(*args) unless delorean_cache_adapter.cache_item?(
      klass: self, method_name: name, args: args
    )

    cache_key = delorean_cache_adapter.cache_key(
      klass: self, method_name: name, args: args
    )
    cached_item = delorean_cache_adapter.fetch_item(
      klass: self, cache_key: cache_key, default: :NF
    )

    next cached_item if cached_item != :NF

    res = yield(*args)

    delorean_cache_adapter.cache_item(
      klass: self, cache_key: cache_key, item: res
    )

    # Since we're caching this object and don't want anyone
    # changing it.  FIXME: ideally should freeze this object
    # recursively.
    res.freeze if res.respond_to?(:freeze)

    res
  end
end

#clear_lookup_cache! ⇒ Object 



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# File 'lib/delorean/functions.rb', line 57

def clear_lookup_cache!
  ::Delorean::Cache.adapter.clear!(klass: self)
end

#delorean_fn(name, _options = {}, &block) ⇒ Object 



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# File 'lib/delorean/functions.rb', line 5

def delorean_fn(name, _options = {}, &block)
  any_args = Delorean::Ruby::Whitelists::Matchers::Arguments::ANYTHING

  define_singleton_method(name, block)

  ::Delorean::Ruby.whitelist.add_class_method name do |method|
    method.called_on self, with: any_args
  end
end