cache

package

v0.0.0-...-0345585 Latest Latest Go to latest Published: Jun 5, 2014 License: MIT Imports: 6 Imported by: 0

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Package cache provides a cached Image Provider

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type CacheKeyGenerator interface {
	GetKey(source interface{}, parameters imageserver.Parameters) string
}

CacheKeyGenerator generates a Cache Key

type CacheKeyGeneratorFunc func(source interface{}, parameters imageserver.Parameters) string

CacheKeyGeneratorFunc is a CacheKeyGenerator func

func NewSourceHashCacheKeyGeneratorFunc(newHashFunc func() hash.Hash) CacheKeyGeneratorFunc

NewSourceHashCacheKeyGeneratorFunc returns a CacheKeyGeneratorFunc that hashes the source

func (f CacheKeyGeneratorFunc) GetKey(source interface{}, parameters imageserver.Parameters) string

GetKey calls the func

type CacheProvider struct {
	imageserver.Provider
	imageserver_cache.Cache
	CacheKeyGenerator
}

CacheProvider represents a cached Image Provider

func (provider *CacheProvider) Get(source interface{}, parameters imageserver.Parameters) (*imageserver.Image, error)

Get returns an Image for a source

It caches the image. The cache key used is a sha256 of the source's string representation.