PACKAGE DOCUMENTATION
package objcache
import "github.com/minio/minio/pkg/objcache"
Package objcache implements in memory caching methods.
CONSTANTS
const (
// NoExpiry represents caches to be permanent and can only be deleted.
NoExpiry = time.Duration(0)
// DefaultExpiry represents three days time duration when individual entries will be expired.
DefaultExpiry = time.Duration(3 * 24 * time.Hour)
)
VARIABLES
var ErrCacheFull = errors.New("Not enough space in cache")
ErrCacheFull - cache is full.
var ErrKeyNotFoundInCache = errors.New("Key not found in cache")
ErrKeyNotFoundInCache - key not found in cache.
TYPES
type Cache struct {
// OnEviction - callback function for eviction
OnEviction func(key string)
// contains filtered or unexported fields
}
Cache holds the required variables to compose an in memory cache system
which also provides expiring key mechanism and also maxSize.
func New(maxSize uint64, expiry time.Duration) *Cache
New - Return a new cache with a given default expiry duration. If the
expiry duration is less than one (or NoExpiry), the items in the cache
never expire (by default), and must be deleted manually.
func (c *Cache) Create(key string, size int64) (w io.WriteCloser, err error)
Create - validates if object size fits with in cache size limit and
returns a io.WriteCloser to which object contents can be written and
finally Close()'d. During Close() we checks if the amount of data
written is equal to the size of the object, in which case it saves the
contents to object cache.
func (c *Cache) Delete(key string)
Delete - delete deletes an entry from the cache.
func (c *Cache) DeleteExpired()
DeleteExpired - deletes all the expired entries from the cache.
func (c *Cache) Open(key string) (io.ReadSeeker, error)
Open - open the in-memory file, returns an in memory read seeker.
returns an error ErrNotFoundInCache, if the key does not exist.
func (c *Cache) StopExpiry()
StopExpiry sends a message to the expiry routine to stop expiring cached
entries. NOTE: once this is called, cached entries will not be expired
if the consume has called this.
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