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 9

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

Instance Method Details

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

Raises:



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# File 'lib/ioc.rb', line 14

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 35

def release
  @cache = {}
end

#resolve(key) ⇒ Object

Raises:



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# File 'lib/ioc.rb', line 20

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

#validate! ⇒ Object 



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# File 'lib/ioc.rb', line 39

def validate!
  missing = []
  class_services = @services.values.reject{|service| service.is_a?(Proc)}
  class_services.each do |service|
    dependencies = get_dependencies(service)
    dependencies.each do |dependency|
      unless @services.key?(dependency)
        missing << dependency
      end
    end
  end
  missing.uniq!

  unless missing.empty?
    raise(MissingDependenciesError, "missing dependencies: '#{missing.join(', ')}'")
  end
end