// NewCache returns a physical cache of the given size.
// If no size is provided, the default size is used.
func NewCache(b Backend, size int, logger log.Logger) *Cache {
if size <= 0 {
size = DefaultCacheSize
}
if logger.IsTrace() {
logger.Trace("physical/cache: creating LRU cache", "size", size)
}
cache, _ := lru.New2Q(size)
c := &Cache{
backend: b,
lru: cache,
}
return c
}