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In-Memory Cache

InMemoryCacheClient stores data in a ConcurrentHashMap. No external dependencies, no configuration.

Setup

val cache: CacheClient = InMemoryCacheClient()

Characteristics

  • No persistence — cache is lost when the process stops.
  • No TTL support — expire and hexpire are no-ops; data lives until explicitly evicted.
  • Not shared — each process has its own independent cache. Do not use in multi-instance deployments where cache consistency matters.
  • Ideal for tests — deterministic, fast, zero infrastructure.

Testing

InMemoryCacheClient is the recommended backend for unit and integration tests:

@BeforeEach
fun setUp() {
    cache = InMemoryCacheClient()
    controller = MongoKacheController(cache = cache)
}

Starting each test with a fresh instance ensures no state leaks between tests.