func (c completedConfig) New(name string, delegationTarget DelegationTarget) (*GenericAPIServer, error) {
	if c.Serializer == nil {
		return nil, fmt.Errorf("Genericapiserver.New() called with config.Serializer == nil")
	}
	if c.LoopbackClientConfig == nil {
		return nil, fmt.Errorf("Genericapiserver.New() called with config.LoopbackClientConfig == nil")
	}
	if c.EquivalentResourceRegistry == nil {
		return nil, fmt.Errorf("Genericapiserver.New() called with config.EquivalentResourceRegistry == nil")
	}

	handlerChainBuilder := func(handler http.Handler) http.Handler {
		return c.BuildHandlerChainFunc(handler, c.Config)
	}

	apiServerHandler := NewAPIServerHandler(name, c.Serializer, handlerChainBuilder, delegationTarget.UnprotectedHandler())

	s := &GenericAPIServer{
		discoveryAddresses:         c.DiscoveryAddresses,
		LoopbackClientConfig:       c.LoopbackClientConfig,
		legacyAPIGroupPrefixes:     c.LegacyAPIGroupPrefixes,
		admissionControl:           c.AdmissionControl,
		Serializer:                 c.Serializer,
		AuditBackend:               c.AuditBackend,
		Authorizer:                 c.Authorization.Authorizer,
		delegationTarget:           delegationTarget,
		EquivalentResourceRegistry: c.EquivalentResourceRegistry,
		HandlerChainWaitGroup:      c.HandlerChainWaitGroup,
		Handler:                    apiServerHandler,

		listedPathProvider: apiServerHandler,

		minRequestTimeout:     time.Duration(c.MinRequestTimeout) * time.Second,
		ShutdownTimeout:       c.RequestTimeout,
		ShutdownDelayDuration: c.ShutdownDelayDuration,
		SecureServingInfo:     c.SecureServing,
		ExternalAddress:       c.ExternalAddress,

		openAPIConfig:           c.OpenAPIConfig,
		openAPIV3Config:         c.OpenAPIV3Config,
		skipOpenAPIInstallation: c.SkipOpenAPIInstallation,

		postStartHooks:         map[string]postStartHookEntry{},
		preShutdownHooks:       map[string]preShutdownHookEntry{},
		disabledPostStartHooks: c.DisabledPostStartHooks,

		healthzChecks:    c.HealthzChecks,
		livezChecks:      c.LivezChecks,
		readyzChecks:     c.ReadyzChecks,
		livezGracePeriod: c.LivezGracePeriod,

		DiscoveryGroupManager: discovery.NewRootAPIsHandler(c.DiscoveryAddresses, c.Serializer),

		maxRequestBodyBytes: c.MaxRequestBodyBytes,
		livezClock:          clock.RealClock{},

		lifecycleSignals:       c.lifecycleSignals,
		ShutdownSendRetryAfter: c.ShutdownSendRetryAfter,

		APIServerID:           c.APIServerID,
		StorageVersionManager: c.StorageVersionManager,

		Version: c.Version,

		muxAndDiscoveryCompleteSignals: map[string]<-chan struct{}{},
	}

	for {
		if c.JSONPatchMaxCopyBytes <= 0 {
			break
		}
		existing := atomic.LoadInt64(&jsonpatch.AccumulatedCopySizeLimit)
		if existing > 0 && existing < c.JSONPatchMaxCopyBytes {
			break
		}
		if atomic.CompareAndSwapInt64(&jsonpatch.AccumulatedCopySizeLimit, existing, c.JSONPatchMaxCopyBytes) {
			break
		}
	}

	// first add poststarthooks from delegated targets
  // 从delegated targets中添加poststarthooks
	for k, v := range delegationTarget.PostStartHooks() {
		s.postStartHooks[k] = v
	}
	// 从delegated targets中添加preshutdownhooks
	for k, v := range delegationTarget.PreShutdownHooks() {
		s.preShutdownHooks[k] = v
	}

	// add poststarthooks that were preconfigured.  Using the add method will give us an error if the same name has already been registered.
  // 从提前配置好的地方增加poststarthooks。使用add方法，如果这个名称已经被注册了，就会报错。
	for name, preconfiguredPostStartHook := range c.PostStartHooks {
		if err := s.AddPostStartHook(name, preconfiguredPostStartHook.hook); err != nil {
			return nil, err
		}
	}

	// register mux signals from the delegated server
  // 从delegated服务器中注册mux信号
	for k, v := range delegationTarget.MuxAndDiscoveryCompleteSignals() {
		if err := s.RegisterMuxAndDiscoveryCompleteSignal(k, v); err != nil {
			return nil, err
		}
	}

	genericApiServerHookName := "generic-apiserver-start-informers"
  //这一步是注册一个叫“generic-apiserver-start-informers”的hook
	if c.SharedInformerFactory != nil {
		if !s.isPostStartHookRegistered(genericApiServerHookName) {
			err := s.AddPostStartHook(genericApiServerHookName, func(context PostStartHookContext) error {
        //hook的内容就是开启SharedInformerFactory
				c.SharedInformerFactory.Start(context.StopCh)
				return nil
			})
			if err != nil {
				return nil, err
			}
		}
		// TODO: Once we get rid of /healthz consider changing this to post-start-hook.
    // 以后会把/healthz做成post-start-hook
		err := s.AddReadyzChecks(healthz.NewInformerSyncHealthz(c.SharedInformerFactory))
		if err != nil {
			return nil, err
		}
	}
	// 这个是增加的另一个hook，名字叫“priority-and-fairness-config-consumer”
	const priorityAndFairnessConfigConsumerHookName = "priority-and-fairness-config-consumer"
	if s.isPostStartHookRegistered(priorityAndFairnessConfigConsumerHookName) {
	} else if c.FlowControl != nil {
    // 添加这个PostStartHook
		err := s.AddPostStartHook(priorityAndFairnessConfigConsumerHookName, func(context PostStartHookContext) error {
      // 启动FlowControl两个go协程，有机会晚点再看看这个东西
			go c.FlowControl.MaintainObservations(context.StopCh)
			go c.FlowControl.Run(context.StopCh)
			return nil
		})
		if err != nil {
			return nil, err
		}
		// TODO(yue9944882): plumb pre-shutdown-hook for request-management system?
	} else {
		klog.V(3).Infof("Not requested to run hook %s", priorityAndFairnessConfigConsumerHookName)
	}

	// Add PostStartHooks for maintaining the watermarks for the Priority-and-Fairness and the Max-in-Flight filters.
  // 为了维持Priority-and-Fairness和Max-in-Flight的watermarks添加的PostStartHooks
	if c.FlowControl != nil {
		const priorityAndFairnessFilterHookName = "priority-and-fairness-filter"
		if !s.isPostStartHookRegistered(priorityAndFairnessFilterHookName) {
			err := s.AddPostStartHook(priorityAndFairnessFilterHookName, func(context PostStartHookContext) error {
				genericfilters.StartPriorityAndFairnessWatermarkMaintenance(context.StopCh)
				return nil
			})
			if err != nil {
				return nil, err
			}
		}
	} else {
		const maxInFlightFilterHookName = "max-in-flight-filter"
		if !s.isPostStartHookRegistered(maxInFlightFilterHookName) {
			err := s.AddPostStartHook(maxInFlightFilterHookName, func(context PostStartHookContext) error {
				genericfilters.StartMaxInFlightWatermarkMaintenance(context.StopCh)
				return nil
			})
			if err != nil {
				return nil, err
			}
		}
	}
	// 这里是检查添加delegate的健康检查
	for _, delegateCheck := range delegationTarget.HealthzChecks() {
		skip := false
		for _, existingCheck := range c.HealthzChecks {
			if existingCheck.Name() == delegateCheck.Name() {
				skip = true
				break
			}
		}
		if skip {
			continue
		}
		s.AddHealthChecks(delegateCheck)
	}

	s.listedPathProvider = routes.ListedPathProviders{s.listedPathProvider, delegationTarget}
	// 根据config安装API
	installAPI(s, c.Config)

	// use the UnprotectedHandler from the delegation target to ensure that we don't attempt to double authenticator, authorize,
	// or some other part of the filter chain in delegation cases.
  // 使用delegation target中的UnprotectedHandler来保证我们不会两次验证身份、权限或者一些其他方面的过滤器。
	if delegationTarget.UnprotectedHandler() == nil && c.EnableIndex {
		s.Handler.NonGoRestfulMux.NotFoundHandler(routes.IndexLister{
			StatusCode:   http.StatusNotFound,
			PathProvider: s.listedPathProvider,
		})
	}

	return s, nil
}