Ruby Redis Setnx

The crashed client c3 still holds it so redis will reply with 0 to c4. Set is one of the most used redis commands and has many variants. You may have to run redis server on another terminal to start the server before you can connect to it.

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Ruby redis setnx.

C4 sends get lock foo to check if the lock expired. Gem install redis you can connect to redis by instantiating the redis class. You can interact with redis directly using redis cli but if you want to work with redis from ruby you should use a gem. This command is equivalent to executing the following commands.

Setnx set if not exists. In the following example only one thread process server can enter the locked block at one time. The redis setex command is used to set some string value with specified timeout in seconds in redis key. Ok if the value is set to key or null if the value does not set.

C4 sends setnx lock foo in order to acquire the lock. Now you re ready to start using redis. There are a few gems available. A ruby client that tries to match redis api one to one while still providing an idiomatic interface.

Redis setnx 命令 redis 字符串 string redis setnx set if not exists 命令在指定的 key 不存在时为 key 设置指定的值语法 redis setnx 命令基本语法如下 redis 127 0 0 1 6379 setnx key name value 可用版本 1 0 0 返回值设置成功返回 1 设置失败. Set mykey value expire mykey seconds. If it is not it will sleep for some time and retry from the start. Return value type.

Redis in ruby chapter 4 adding the missing options to the set command. Supports both blocking and non blocking semantics. See rubydoc info for the api docs of the latest published gem. O 1 set key to hold the string value and set key to timeout after a given number of seconds.

There is demand for additional variants such as setexnx becuase it is a pretty common pattern in caching and sessions handling to set an object only if not already inside the cache and setting it with an expire. Psetex set with milliseconds expire. Setex key name timeout value available since. Setex set with expire.

The idea was taken from the official setnx doc.