Package me.ahoo.cosid.store.redis

Interface RedisScripts

All Known Implementing Classes:

LettuceRedisScripts

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface RedisScripts

The minimal way the Redis store talks to Redis (06-stores.md §2.2, D6): run a Lua script. LettuceRedisScripts implements it on Lettuce; the Spring Data adapter of spring/autoconfigure implements it on a RedisTemplate. Every key of one call shares a hash tag, so the call routes to one Redis Cluster node.

An implementation must not return before the write of the script is acknowledged as far as the deployment requires (06 §2.2): with replicas, the store relies on it to run WAIT after the script on the same connection and to fail the call when the replicas do not acknowledge in time.

Method Summary

Modifier and Type	Method	Description
List<Object>	eval(String sha, String script, List<String> keys, List<String> args)	Runs a script, by its SHA-1 digest when Redis has it cached and by its text otherwise (NOSCRIPT).

Method Details

eval

List<Object> eval(String sha,
 String script,
 List<String> keys,
 List<String> args)

Runs a script, by its SHA-1 digest when Redis has it cached and by its text otherwise (NOSCRIPT).

Parameters:

sha - the lower case hex SHA-1 digest of script

script - the Lua script

keys - the keys, KEYS of the script

args - the arguments, ARGV of the script

Returns:

the multi-bulk reply of the script; bulk strings as String, integers as Long

Throws:

RedisStoreException - if Redis fails, times out or does not acknowledge the write