Class: IOC::Container

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

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Container

Returns a new instance of Container.



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# File 'lib/ioc.rb', line 8

def initialize
  @services = {}
  @cache = {}
end

Instance Method Details

#register(key, klass = nil, &block) ⇒ Object

Raises:



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# File 'lib/ioc.rb', line 13

def register(key, klass=nil, &block)
  raise(DuplicateServiceError, "Service '#{key}' has already been registered") if @services.key?(key)
  raise(RegistrationError, "expected class or block") unless klass || block_given?
  @services[key] = klass ? klass : block
end

#release ⇒ Object 



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# File 'lib/ioc.rb', line 43

def release
  @cache = {}
end

#resolve(key) ⇒ Object

Raises:



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# File 'lib/ioc.rb', line 19

def resolve(key)
  return @cache[key] if @cache.key?(key)
  raise(UnknownServiceError, "Service '#{key}' not registered") unless @services.key?(key)
  
  @cache[key] = 
    if @services[key].is_a?(Proc)
      @services[key].call(self)
    else
      dependencies = @services[key].instance_method(:initialize).parameters.map(&:last)
      resolved_dependencies = dependencies.map{|dependency| resolve(dependency)}
      @services[key].new(*resolved_dependencies)
    end
end

#resolve_by_type(type) ⇒ Object 



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# File 'lib/ioc.rb', line 33

def resolve_by_type(type)
  resolved_services = []
  @services.each do |key, service|
    if service <= type
      resolved_services << resolve(key)
    end
  end
  resolved_services
end