Lazycache is a simple thread safe in-memory LRU cache. Under the hood it leverages the great simpleru package in golang-lru, with its exellent performance. One big difference between golang-lru and this library is the GetOrCreate method, which provides:

• Non-blocking cache priming on cache misses.
• A guarantee that the prime function is only called once for a given key.
• The cache's RWMutex is not locked during the execution of the prime function, which should make it easier to reason about potential deadlocks.

Other notable features:

• The API is generic
• The cache can be resized while running.
• When the number of entries overflows the defined cache size, the least recently used item gets discarded (LRU).