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Index ¶
Constants ¶
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Variables ¶
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Functions ¶
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Types ¶
type GetObjectFunc ¶
GetObjectFunc defines a function to get object with a given namespace and name.
type GetObjectTTLFunc ¶
GetObjectTTLFunc defines a function to get value of TTL.
func GetObjectTTLFromNodeFunc ¶
func GetObjectTTLFromNodeFunc(getNode func() (*v1.Node, error)) GetObjectTTLFunc
GetObjectTTLFromNodeFunc returns a function that returns TTL value from a given Node object.
type Manager ¶
type Manager interface {
// Get object by its namespace and name.
GetObject(namespace, name string) (runtime.Object, error)
// RegisterPod registers all objects referenced from a given pod.
//
// NOTE: All implementations of RegisterPod should be idempotent.
RegisterPod(pod *v1.Pod)
// UnregisterPod unregisters objects referenced from a given pod that are not
// used by any other registered pod.
//
// NOTE: All implementations of UnregisterPod should be idempotent.
UnregisterPod(pod *v1.Pod)
}
Manager is the interface for registering and unregistering objects referenced by pods in the underlying cache and extracting those from that cache if needed.
func NewCacheBasedManager ¶
func NewCacheBasedManager(objectStore Store, getReferencedObjects func(*v1.Pod) sets.String) Manager
NewCacheBasedManager creates a manager that keeps a cache of all objects necessary for registered pods. It implements the following logic:
- whenever a pod is created or updated, the cached versions of all objects is referencing are invalidated
- every GetObject() call tries to fetch the value from local cache; if it is not there, invalidated or too old, we fetch it from apiserver and refresh the value in cache; otherwise it is just fetched from cache
func NewWatchBasedManager ¶
func NewWatchBasedManager( listObject listObjectFunc, watchObject watchObjectFunc, newObject newObjectFunc, isImmutable isImmutableFunc, groupResource schema.GroupResource, resyncInterval time.Duration, getReferencedObjects func(*v1.Pod) sets.String) Manager
NewWatchBasedManager creates a manager that keeps a cache of all objects necessary for registered pods. It implements the following logic:
- whenever a pod is created or updated, we start individual watches for all referenced objects that aren't referenced from other registered pods
- every GetObject() returns a value from local cache propagated via watches
type Store ¶
type Store interface {
// AddReference adds a reference to the object to the store.
// Note that multiple additions to the store has to be allowed
// in the implementations and effectively treated as refcounted.
AddReference(namespace, name string)
// DeleteReference deletes reference to the object from the store.
// Note that object should be deleted only when there was a
// corresponding Delete call for each of Add calls (effectively
// when refcount was reduced to zero).
DeleteReference(namespace, name string)
// Get an object from a store.
Get(namespace, name string) (runtime.Object, error)
}
Store is the interface for a object cache that can be used by cacheBasedManager.
func NewObjectCache ¶
func NewObjectCache( listObject listObjectFunc, watchObject watchObjectFunc, newObject newObjectFunc, isImmutable isImmutableFunc, groupResource schema.GroupResource, clock clock.Clock, maxIdleTime time.Duration) Store
NewObjectCache returns a new watch-based instance of Store interface.
func NewObjectStore ¶
func NewObjectStore(getObject GetObjectFunc, clock clock.Clock, getTTL GetObjectTTLFunc, ttl time.Duration) Store
NewObjectStore returns a new ttl-based instance of Store interface.
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