class IOC::Container
Public Class Methods
new()
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# File lib/ioc.rb, line 9 def initialize @services = {} @cache = {} end
Public Instance Methods
register(key, klass=nil, &block)
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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()
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# File lib/ioc.rb, line 40 def release @cache = {} end
resolve(key)
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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
resolve_by_type(type)
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# File lib/ioc.rb, line 35 def resolve_by_type(type) key, service = @services.find{|key, service| !service.is_a?(Proc) && service <= type} key ? resolve(key) : raise(UnknownServiceError, "Service of type '#{type}' not registered") end
validate!()
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# File lib/ioc.rb, line 44 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
Private Instance Methods
get_dependencies(service)
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# File lib/ioc.rb, line 64 def get_dependencies(service) service.instance_method(:initialize).parameters.map(&:last) end