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Lesson 8. Integrating with Redis

Hi! Long time I haven't posted lessons. Sorry for that:) Today we are integrating our highload bot with lighting fast database called Redis. I am using it for data that needs quick access.

Library

For driver I chose Lettuce because of its popularity and good documentation. You can download it here or install with Maven:

<dependency>
    <groupId>io.lettuce</groupId>
    <artifactId>lettuce-core</artifactId>
    <version>Latest</version>
</dependency>

Establish connection

Then, you need to connect to Redis:

RedisClient redisClient;
StatefulRedisConnection<String, String> redisConnection;
RedisCommands<String, String> syncCommands;

redisClient = RedisClient.create("redis://localhost:6379/0"); // Format: redis://ip:post/dbNumber
redisConnection = redisClient.connect();
syncCommands = this.redisConnection.sync();

Connection established

And thats all! Now you can execute commands like that:

syncCommands.get("key");
syncCommands.set("key", "value");
syncCommands.lrange("key", 0, -1);

Also, don't forget to close connection with Redis when you done your work:

redisConnection.close();
redisClient.shutdown();

Very short lesson, but I think useful :D Thanks for your time, hope to see you soon!