memory

const (
	// DefaultShards is the number of cache shards for concurrent access.
	// Higher values reduce lock contention but increase memory overhead.
	DefaultShards = 1024

	// DefaultLifeWindow is the maximum age of cached DNS responses.
	// After this duration, entries are evicted regardless of DNS TTL.
	DefaultLifeWindow = time.Minute

	// DefaultCleanWindow is the interval between cleanup cycles.
	// Lower values free memory faster but increase CPU usage.
	DefaultCleanWindow = 30 * time.Second

	// DefaultMaxEntriesInWindow estimates peak entries during LifeWindow.
	// Used for initial memory allocation (1000 entries/sec * 60 sec).
	DefaultMaxEntriesInWindow = 1000 * 10 * 60

	// DefaultMaxEntrySize is the maximum size of a single DNS message in bytes.
	// Larger responses will fail to cache. Typical DNS-over-UDP limit is 512 bytes.
	DefaultMaxEntrySize = 500
)