Claude
b0c39a8d4c
Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3
52 lines
1.4 KiB
Plaintext
52 lines
1.4 KiB
Plaintext
# TTL: set, read, lose, keep and clear it
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--- No TTL, and a key that does not exist ---
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set("plain", "v")
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getExpire("plain") = -1
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getExpire("missing") = -2
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--- Set a value with a Duration ---
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set("session", "v1", Duration.ofMinutes(10))
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getExpire("session") = 600
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getExpire("session", TimeUnit.MINUTES) = 9
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$ redis-cli -p 6390 --no-raw TTL session
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(integer) 600
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--- A plain set() afterwards throws the TTL away ---
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set("session", "v2")
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getExpire("session") = -1
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$ redis-cli -p 6390 --no-raw TTL session
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(integer) -1
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--- Put a TTL back, then overwrite while keeping it ---
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expire("session", Duration.ofMinutes(10))
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set("session", "v3", Expiration.keepTtl())
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getExpire("session") = 600, value = v3
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$ redis-cli -p 6390 --no-raw TTL session
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(integer) 600
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--- Sub-second precision ---
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set("short", "v", Duration.ofMillis(1500))
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getExpire("short", TimeUnit.MILLISECONDS) <= 1500: true
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getExpire("short") in seconds = 1
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--- persist() removes a TTL ---
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persist("session")
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getExpire("session") = -1
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--- Expiry actually happens ---
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set("blink", "v", Duration.ofMillis(300))
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get("blink") straight away = v
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get("blink") later = null
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$ redis-cli -p 6390 --no-raw EXISTS blink
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(integer) 0
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--- setIfAbsent with a TTL is the smallest lock ---
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setIfAbsent("lock:job", "worker-1", 30s) = true
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setIfAbsent("lock:job", "worker-2", 30s) = false
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$ redis-cli -p 6390 --no-raw GET lock:job
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"worker-1"
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$ redis-cli -p 6390 --no-raw TTL lock:job
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(integer) 30
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