三:Redis连接池、JedisPool详解、Redisi分布式

时间:2020-12-24 07:45:10

单机模式

 package com.ljq.utils;

 import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig; /**
* Redis操作接口
*
* @author NiceCui
* @version 1.0 2017-6-14 上午08:54:14
*/
public class RedisAPI {
private static JedisPool pool = null; /**
* 构建redis连接池
*
* @param ip
* @param port
* @return JedisPool
*/
public static JedisPool getPool() {
if (pool == null) {
JedisPoolConfig config = new JedisPoolConfig();
//控制一个pool可分配多少个jedis实例,通过pool.getResource()来获取;
//如果赋值为-1,则表示不限制;如果pool已经分配了maxActive个jedis实例,则此时pool的状态为exhausted(耗尽)。
config.setMaxActive(500);
//控制一个pool最多有多少个状态为idle(空闲的)的jedis实例。
config.setMaxIdle(5);
//表示当borrow(引入)一个jedis实例时,最大的等待时间,如果超过等待时间,则直接抛出JedisConnectionException;
config.setMaxWait(1000 * 100);
//在borrow一个jedis实例时,是否提前进行validate操作;如果为true,则得到的jedis实例均是可用的;
config.setTestOnBorrow(true);
pool = new JedisPool(config, "192.168.2.191", 8888);
}
return pool;
} /**
* 返还到连接池
*
* @param pool
* @param redis
*/
public static void returnResource(JedisPool pool, Jedis redis) {
if (redis != null) {
pool.returnResource(redis);
}
} /**
* 获取数据
*
* @param key
* @return
*/
public static String get(String key){
String value = null; JedisPool pool = null;
Jedis jedis = null;
try {
pool = getPool();
jedis = pool.getResource();
value = jedis.get(key);
} catch (Exception e) {
//释放redis对象
pool.returnBrokenResource(jedis);
e.printStackTrace();
} finally {
//返还到连接池
returnResource(pool, jedis);
} return value;
}
}

分布式模式

ShardedJe、dis是基于一致性哈希算法实现的分布式Redis集群客户端

 package com.jd.redis.client;

 import java.util.ArrayList;
import java.util.List; import redis.clients.jedis.JedisPoolConfig;
import redis.clients.jedis.JedisShardInfo;
import redis.clients.jedis.ShardedJedis;
import redis.clients.jedis.ShardedJedisPool;
import redis.clients.util.Hashing;
import redis.clients.util.Sharded; publicclass RedisShardPoolTest { static ShardedJedisPoolpool; static{ JedisPoolConfig config =new JedisPoolConfig();//Jedis池配置 config.setMaxActive(500);//最大活动的对象个数 config.setMaxIdle(1000 * 60);//对象最大空闲时间 config.setMaxWait(1000 * 10);//获取对象时最大等待时间 config.setTestOnBorrow(true); String hostA = "10.10.224.44"; int portA = 6379; String hostB = "10.10.224.48"; int portB = 6379; List<JedisShardInfo> jdsInfoList =new ArrayList<JedisShardInfo>(2); JedisShardInfo infoA = new JedisShardInfo(hostA, portA); infoA.setPassword("redis.360buy"); JedisShardInfo infoB = new JedisShardInfo(hostB, portB); infoB.setPassword("redis.360buy"); jdsInfoList.add(infoA); jdsInfoList.add(infoB); pool =new ShardedJedisPool(config, jdsInfoList, Hashing.MURMUR_HASH,
Sharded.DEFAULT_KEY_TAG_PATTERN);
//传入连接池配置、分布式redis服务器主机信息、分片规则(存储到哪台redis服务器)
} /** * @param args */ publicstaticvoid main(String[] args) { for(int i=0; i<100; i++){
String key =generateKey();
//key += "{aaa}";
ShardedJedis jds =null;
try {
jds =pool.getResource();
System.out.println(key+":"+jds.getShard(key).getClient().getHost());
System.out.println(jds.set(key,"1111111111111111111111111111111"));
}catch (Exception e) {
e.printStackTrace();
}
finally{
pool.returnResourceObject(jds);
} } } privatestaticintindex = 1; publicstatic String generateKey(){ return String.valueOf(Thread.currentThread().getId())+"_"+(index++); }
}