Learning from jedis

Time:2021-1-20

Learning from jedis

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Introduction to jedis

Redis not only uses commands to operate, but also uses program client to operate. Now basically, the mainstream languages have client support, such as Java, C, C #, C + +, PHP, go, etc
Some Java clients are listed in the official website, and the one most used in enterprises is jedis.

Basic use

public class JedisTest {
    @Test
    public void testJedis() {
        //Create a connection to jedis
        Jedis jedis = new Jedis("192.168.232.128", 6379);
        //Execute the redis command
        jedis.set("k1", "jedis");
        //Value from redis
        String result = jedis.get("k1");
        //Print results
        System.out.println(result);
        //Close the connection
        jedis.close();

    }
}

View the results after running:

jedis

After the jedis object is constructed, the bottom layer of jedis will open a socket channel to connect with the redis service
The frequent creation and destruction of jedis objects has a great impact on performance.

Use of connection pool

@Test
    public void testJedisPool() {
        JedisPoolConfig config = new JedisPoolConfig();
        //Controls the maximum number of jedis instances with idle status in a pool
        config.setMaxIdle(8);
        //Maximum connections
        config.setMaxTotal(18);
        //Create a connection pool object
        JedisPool jedisPool = new JedisPool(config,"192.168.232.128", 6379);
        //Get connections from connection pool
        Jedis jedis = jedisPool.getResource();
        String result = jedis.get("k1") ;
        System.out.println(result);
        //Close the connection
        jedis.close();
        
        //Close the connection池
        jedisPool.close();
    }

View the results after running:

jedis

Jedis connect cluster

@Test
    public void testJedisCluster() {
        //Creating a jediscluster object
        Set<HostAndPort> nodes = new HashSet<>();
        nodes.add(new HostAndPort("192.168.232.128", 7001));
        nodes.add(new HostAndPort("192.168.232.128", 7002));
        nodes.add(new HostAndPort("192.168.232.128", 7003));
        nodes.add(new HostAndPort("192.168.232.128", 7004));
        nodes.add(new HostAndPort("192.168.232.128", 7005));
        nodes.add(new HostAndPort("192.168.232.128", 7006));
        JedisCluster cluster = new JedisCluster(nodes);
        //The API method of cluster object is used to add and query redis cluster
        cluster.set("c1", "jedisCluster");
        System.out.println(cluster.get("c1"));
        //Release resources
        cluster.close();
    }

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