Golang golang-lru.New函數代碼示例

// newQuotaEvaluator configures an admission controller that can enforce quota constraints
// using the provided registry.  The registry must have the capability to handle group/kinds that
// are persisted by the server this admission controller is intercepting
func newQuotaEvaluator(client clientset.Interface, registry quota.Registry) (*quotaEvaluator, error) {
	liveLookupCache, err := lru.New(100)
	if err != nil {
		return nil, err
	}
	updatedCache, err := lru.New(100)
	if err != nil {
		return nil, err
	}
	lw := &cache.ListWatch{
		ListFunc: func(options api.ListOptions) (runtime.Object, error) {
			return client.Core().ResourceQuotas(api.NamespaceAll).List(options)
		},
		WatchFunc: func(options api.ListOptions) (watch.Interface, error) {
			return client.Core().ResourceQuotas(api.NamespaceAll).Watch(options)
		},
	}
	indexer, reflector := cache.NewNamespaceKeyedIndexerAndReflector(lw, &api.ResourceQuota{}, 0)

	reflector.Run()
	return &quotaEvaluator{
		client:          client,
		indexer:         indexer,
		registry:        registry,
		liveLookupCache: liveLookupCache,
		liveTTL:         time.Duration(30 * time.Second),
		updatedQuotas:   updatedCache,

		queue:      workqueue.New(),
		work:       map[string][]*admissionWaiter{},
		dirtyWork:  map[string][]*admissionWaiter{},
		inProgress: sets.String{},
	}, nil
}

// newQuotaAccessor creates an object that conforms to the QuotaAccessor interface to be used to retrieve quota objects.
func newQuotaAccessor(client clientset.Interface) (*quotaAccessor, error) {
	liveLookupCache, err := lru.New(100)
	if err != nil {
		return nil, err
	}
	updatedCache, err := lru.New(100)
	if err != nil {
		return nil, err
	}
	lw := &cache.ListWatch{
		ListFunc: func(options v1.ListOptions) (runtime.Object, error) {
			internalOptions := api.ListOptions{}
			v1.Convert_v1_ListOptions_To_api_ListOptions(&options, &internalOptions, nil)
			return client.Core().ResourceQuotas(api.NamespaceAll).List(internalOptions)
		},
		WatchFunc: func(options v1.ListOptions) (watch.Interface, error) {
			internalOptions := api.ListOptions{}
			v1.Convert_v1_ListOptions_To_api_ListOptions(&options, &internalOptions, nil)
			return client.Core().ResourceQuotas(api.NamespaceAll).Watch(internalOptions)
		},
	}
	indexer, reflector := cache.NewNamespaceKeyedIndexerAndReflector(lw, &api.ResourceQuota{}, 0)

	return &quotaAccessor{
		client:          client,
		indexer:         indexer,
		reflector:       reflector,
		liveLookupCache: liveLookupCache,
		liveTTL:         time.Duration(30 * time.Second),
		updatedQuotas:   updatedCache,
	}, nil
}

func main() {
	parse_flags()

	var err error
	if enable_cache {
		// create cache
		dns_cache, err = lru.New(1000)
		if err != nil {
			log.Fatal(err)
		}
	}

	dns.HandleFunc(".", handleRoot)

	logger = NewLogger(logfile, debug)

	logger.Info("Listen on %s\n", bind_addr)

	go func() {
		/* listen tcp */
		err := dns.ListenAndServe(bind_addr, "tcp", nil)
		if err != nil {
			log.Fatal(err)
		}
	}()

	/* listen udp */
	err = dns.ListenAndServe(bind_addr, "udp", nil)
	if err != nil {
		log.Fatal(err)
	}
}

// NewKeyCacheStandard constructs a new KeyCacheStandard with the given
// cache capacity.
func NewKeyCacheStandard(capacity int) *KeyCacheStandard {
	head, err := lru.New(capacity)
	if err != nil {
		panic(err.Error())
	}
	return &KeyCacheStandard{head}
}

// NewLimitRanger returns an object that enforces limits based on the supplied limit function
func NewLimitRanger(client clientset.Interface, actions LimitRangerActions) (admission.Interface, error) {
	liveLookupCache, err := lru.New(10000)
	if err != nil {
		return nil, err
	}

	lw := &cache.ListWatch{
		ListFunc: func(options api.ListOptions) (runtime.Object, error) {
			return client.Core().LimitRanges(api.NamespaceAll).List(options)
		},
		WatchFunc: func(options api.ListOptions) (watch.Interface, error) {
			return client.Core().LimitRanges(api.NamespaceAll).Watch(options)
		},
	}
	indexer, reflector := cache.NewNamespaceKeyedIndexerAndReflector(lw, &api.LimitRange{}, 0)
	reflector.Run()

	if actions == nil {
		actions = &DefaultLimitRangerActions{}
	}

	return &limitRanger{
		Handler:         admission.NewHandler(admission.Create, admission.Update),
		client:          client,
		actions:         actions,
		indexer:         indexer,
		liveLookupCache: liveLookupCache,
		liveTTL:         time.Duration(30 * time.Second),
	}, nil
}

func NewPointInPolygon(source string, cache_size int, cache_trigger int, logger *log.WOFLogger) (*WOFPointInPolygon, error) {

	rtree := rtreego.NewTree(2, 25, 50)

	cache, err := lru.New(cache_size)

	if err != nil {
		return nil, err
	}

	metrics := NewPointInPolygonMetrics()

	placetypes := make(map[string]int)

	pip := WOFPointInPolygon{
		Rtree:        rtree,
		Source:       source,
		Cache:        cache,
		CacheSize:    cache_size,
		CacheTrigger: cache_trigger,
		Placetypes:   placetypes,
		Metrics:      metrics,
		Logger:       logger,
	}

	return &pip, nil
}

// NewMDCacheStandard constructs a new MDCacheStandard using the given
// cache capacity.
func NewMDCacheStandard(capacity int) *MDCacheStandard {
	tmp, err := lru.New(capacity)
	if err != nil {
		return nil
	}
	return &MDCacheStandard{tmp}
}

// NewDatastore constructs a new LRU Datastore with given capacity.
func NewDatastore(capacity int) (*Datastore, error) {
	cache, err := lru.New(capacity)
	if err != nil {
		return nil, err
	}

	return &Datastore{cache: cache}, nil
}

func newFlowCache() *flowCache {
	c, err := lru.New(8192)
	if err != nil {
		panic(fmt.Sprintf("LRU flow cache: %v", err))
	}

	return &flowCache{
		cache: c,
	}
}

func NewCache(limit int, ttl time.Duration) *Cache {
	var cache *lru.Cache
	if 0 < limit {
		var err error
		cache, err = lru.New(limit)
		if err != nil {
			panic(err)
		}
	}
	return &Cache{cache: cache, TTL: ttl}
}

// NewStatusAdmitter creates a plugin wrapper that ensures every accepted
// route has a status field set that matches this router. The admitter manages
// an LRU of recently seen conflicting updates to handle when two router processes
// with differing configurations are writing updates at the same time.
func NewStatusAdmitter(plugin router.Plugin, client client.RoutesNamespacer, name string) *StatusAdmitter {
	expected, _ := lru.New(1024)
	return &StatusAdmitter{
		plugin:     plugin,
		client:     client,
		routerName: name,

		contentionInterval: 1 * time.Minute,
		expected:           expected,
	}
}

// NewLifecycle creates a new namespace lifecycle admission control handler
func NewLifecycle(c clientset.Interface, immortalNamespaces sets.String) (admission.Interface, error) {
	forceLiveLookupCache, err := lru.New(100)
	if err != nil {
		panic(err)
	}
	return &lifecycle{
		Handler:              admission.NewHandler(admission.Create, admission.Update, admission.Delete),
		client:               c,
		immortalNamespaces:   immortalNamespaces,
		forceLiveLookupCache: forceLiveLookupCache,
	}, nil
}

func (pc *ProofCache) setup() error {
	pc.Lock()
	defer pc.Unlock()
	if pc.lru != nil {
		return nil
	}
	lru, err := lru.New(pc.capac)
	if err != nil {
		return err
	}
	pc.lru = lru
	return nil
}

func (cs lrustore) Put(key string, value interface{}) {
	prefix, key := key[:PREFIX_LEN], key[PREFIX_LEN:]
	mp, ok := cs[prefix]
	if !ok {
		var err error
		mp, err = lru.New(10000)
		if err != nil {
			return
		}
		cs[prefix] = mp
	}
	mp.Add(key, value)
}

// NewEtcdMutationCache gives back a MutationCache that understands how to deal with etcd backed objects
func NewEtcdMutationCache(backingCache cache.Store) MutationCache {
	lru, err := lru.New(100)
	if err != nil {
		// errors only happen on invalid sizes, this would be programmer error
		panic(err)
	}

	return &mutationCache{
		backingCache:  backingCache,
		mutationCache: lru,
		comparator:    etcd.APIObjectVersioner{},
	}
}