Class: RedisMemo::Memoizable::Dependency

Inherits:
Object
  • Object
show all
Defined in:
lib/redis_memo/memoizable/dependency.rb

Overview

A Directed Acyclic Graph (DAG) of Memoizables

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Dependency

Returns a new instance of Dependency.



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# File 'lib/redis_memo/memoizable/dependency.rb', line 7

def initialize
  @nodes = {}
end

Instance Attribute Details

#nodes ⇒ Object

Returns the value of attribute nodes.



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# File 'lib/redis_memo/memoizable/dependency.rb', line 5

def nodes
  @nodes
end

Instance Method Details

#depends_on(dependency, **conditions) ⇒ Object 



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# File 'lib/redis_memo/memoizable/dependency.rb', line 15

def depends_on(dependency, **conditions)
  case dependency
  when self.class
    nodes.merge!(dependency.nodes)
  when RedisMemo::Memoizable
    memo = dependency
    return if nodes.include?(memo.cache_key)
    nodes[memo.cache_key] = memo

    if memo.depends_on
      # Extract dependencies from the current memoizable and recurse
      instance_exec(&memo.depends_on)
    end
  when ActiveRecord::Relation
    extracted = self.class.extract_from_relation(dependency)
    nodes.merge!(extracted.nodes)
  when RedisMemo::MemoizeQuery::CachedSelect::BindParams
    # A private API
    dependency.params.each do |model, attrs_set|
      memo = model.redis_memo_class_memoizable
      nodes[memo.cache_key] = memo

      attrs_set.each do |attrs|
        memo = RedisMemo::MemoizeQuery.create_memo(model, **attrs)
        nodes[memo.cache_key] = memo
      end
    end
  else
    raise(
      RedisMemo::ArgumentError,
      "Invalid dependency #{dependency}"
    )
  end
end

#memos ⇒ Object 



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# File 'lib/redis_memo/memoizable/dependency.rb', line 11

def memos
  @nodes.values
end