ca.bitcoco.jsk.redis.RedisCacheClient Maven / Gradle / Ivy

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package ca.bitcoco.jsk.redis;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

import java.time.Duration;
import java.util.Set;

public class RedisCacheClient {

    final JedisPoolConfig poolConfig;
    final JedisPool jedisPool;


    public RedisCacheClient(String host) {
        this.poolConfig = buildPoolConfig();
        this.jedisPool = new JedisPool(this.poolConfig, host);
    }

    public boolean hasConnected() {
        try (Jedis jedis = jedisPool.getResource()) {
            return true;
        } catch (Exception e) {
            return false;
        }
    }


    private JedisPoolConfig buildPoolConfig() {
        final JedisPoolConfig poolConfig = new JedisPoolConfig();
        poolConfig.setMaxTotal(128);
        poolConfig.setMaxIdle(128);
        poolConfig.setMinIdle(16);
        poolConfig.setTestOnBorrow(true);
        poolConfig.setTestOnReturn(true);
        poolConfig.setTestWhileIdle(true);
        poolConfig.setMinEvictableIdleTimeMillis(Duration.ofSeconds(60).toMillis());
        poolConfig.setTimeBetweenEvictionRunsMillis(Duration.ofSeconds(30).toMillis());
        poolConfig.setNumTestsPerEvictionRun(3);
        poolConfig.setBlockWhenExhausted(true);
        return poolConfig;
    }


    /**
     * Set the string value as value of the key. The string can't be longer than 1073741824 bytes (1
     * GB).
     *
     * @param key
     * @param value
     * @return Status code reply
     */
    public String setString(String key, String value) {
        try (Jedis jedis = jedisPool.getResource()) {
            // NX|XX, NX -- Only set the key if it does not already exist. XX -- Only set the key if it already exist.
            // EX|PX, expire time units: EX = seconds; PX = milliseconds
            // expire time in the units of seconds, set default as 3600
            return jedis.set(key, value, "NX", "EX", 3600);
        }
    }


    /**
     * Set the string value as value of the key. The string can't be longer than 1073741824 bytes (1
     * GB).
     *
     * @param key
     * @param value
     * @param time  expire time in the units of seconds
     * @return Status code reply
     */
    public String setString(String key, String value, final long time) {
        try (Jedis jedis = jedisPool.getResource()) {
            // NX|XX, NX -- Only set the key if it does not already exist. XX -- Only set the key if it already exist.
            // EX|PX, expire time units: EX = seconds; PX = milliseconds
            return jedis.set(key, value, "NX", "EX", time);
        }
    }


    public String getString(String key) {
        try (Jedis jedis = jedisPool.getResource()) {
            return jedis.get(key);
        }
    }


    public String getString(String key, String defaultString) {
        try (Jedis jedis = jedisPool.getResource()) {
            if (jedis.get(key) != null) {
                return jedis.get(key);
            } else {
                return defaultString;
            }
        }
    }


    public Long deleteCache(String key) {
        try (Jedis jedis = jedisPool.getResource()) {
            return jedis.del(key);
        }
    }


    public Long deleteCache(String... keys) {
        try (Jedis jedis = jedisPool.getResource()) {
            return jedis.del(keys);
        }
    }


    /**
     * Set the string value as value of the key. The string can't be longer than 1073741824 bytes (1
     * GB).
     *
     * @param prefix could be * for all
     * @return set of keys
     */
    public Set getKeys(String prefix) {
        try (Jedis jedis = jedisPool.getResource()) {
            return jedis.keys(prefix + "*");
        }
    }
}