cache

type Cache interface {
	// Put stores the given (key,value) pair, replacing existing value if
	// key already exists. The return value indicates whether items had to
	// be evicted to make room for the new element.
	Put(key interface{}, value Value) (bool, er.R)

	// Get returns the value for a given key.
	Get(key interface{}) (Value, er.R)

	// Len returns number of elements in the cache.
	Len() int
}

type CacheableBlock struct {
	*btcutil.Block
}

type CacheableFilter struct {
	*gcs.Filter
}

type FilterCacheKey struct {
	BlockHash  chainhash.Hash
	FilterType filterdb.FilterType
}

type Value interface {
	// Size determines how big this entry would be in the cache. For
	// example, for a filter, it could be the size of the filter in bytes.
	Size() (uint64, er.R)
}