Redis with Jedis (Java)

Uses Jedis 8.0 (JedisPooled). The code is an ordinary application for the original database; nothing in it knows about MachNoSQL.

The only change

redis://:secret@redis.example.com:6379/0
redis://:secret@machnosql.example.com:6379/0

The address comes from the environment variable REDIS_URL, so switching to MachNoSQL changes configuration only.

Run

export REDIS_URL='redis://:secret@machnosql.example.com:6379/0'
mvn -q compile exec:java

Source

The program as it is kept and tested in the Mach Database NoSQL repository; highlighted lines read the connection setting.

src/main/java/example/App.java

// Cache, counter, session and leaderboard on Redis, unchanged on MachNoSQL.
package example;

import java.net.URI;
import java.util.Map;
import redis.clients.jedis.AbstractTransaction;
import redis.clients.jedis.JedisPooled;
import redis.clients.jedis.params.SetParams;

public final class App {
    public static void main(String[] args) {
        try (JedisPooled jedis = new JedisPooled(URI.create(System.getenv("REDIS_URL")))) {
            jedis.set("cache:home", "<html>...</html>", SetParams.setParams().ex(60));
            System.out.println("cached: " + jedis.get("cache:home") + " ttl: " + jedis.ttl("cache:home"));

            System.out.println("views: " + jedis.incr("views:home"));

            jedis.hset("session:42", Map.of("user", "ada", "cart_items", "3"));
            System.out.println("session: " + jedis.hgetAll("session:42"));

            jedis.zadd("leaderboard", Map.of("ada", 120.0, "linus", 95.0, "grace", 130.0));
            System.out.println("top: " + jedis.zrevrangeWithScores("leaderboard", 0, 2));

            try (AbstractTransaction tx = jedis.multi()) {
                tx.incr("orders:count");
                tx.lpush("orders:recent", "order-1001");
                tx.ltrim("orders:recent", 0, 99);
                System.out.println("pipeline: " + tx.exec());
            }
        }
    }
}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.example.machnosql</groupId>
  <artifactId>redis-jedis-example</artifactId>
  <version>1.0</version>
  <properties>
    <maven.compiler.release>21</maven.compiler.release>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <exec.mainClass>example.App</exec.mainClass>
  </properties>
  <dependencies>
    <dependency>
      <groupId>redis.clients</groupId>
      <artifactId>jedis</artifactId>
      <version>8.0.2</version>
    </dependency>
  </dependencies>
</project>