Java-no.13 based on Redis distributed cache implementation

1. Redis implements distributed cache

package com.shma.redis;import java.util.list;import  Org.apache.commons.pool2.impl.genericobjectpoolconfig;import redis.clients.jedis.jedisshardinfo;import  redis.clients.jedis.shardedjedis;import redis.clients.jedis.shardedjedispool;public class  RedisService {private GenericObjectPoolConfig jedisPoolConfig;private List< Jedisshardinfo> jedisshardinfos;private shardedjedispool sharejedispool;public void  init ()  {sharejedispool =new shardedjedispool (Jedispoolconfig, jedisshardinfos);} Public shardedjedis getsharejedispoolconnection ()  {ShardedJedis shardedJedis =  Sharejedispool.getresource (); Return shardedjedis;} Public genericobjectpoolconfig getjedispoolconfig ()  {return jedispoolconfig;} Public void setjedispoolconfig (Genericobjectpoolconfig jedispoolconfig)  { This.jedispoolconfig = jedispoolconfig;} PUblic list<jedisshardinfo> getjedisshardinfos ()  {return jedisshardinfos;} Public void setjedisshardinfos (List<jedisshardinfo> jedisshardinfos)  { This.jedisshardinfos = jedisshardinfos;} Public shardedjedispool getsharejedispool ()  {return sharejedispool;} Public void setsharejedispool (Shardedjedispool sharejedispool)  {this.shareJedisPool =  sharejedispool;}}

Package com.shma.redis;import redis.clients.jedis.shardedjedis;public class rediscache  {private redisservice redisservice;public void set (String key, String  value)  {ShardedJedis shardedJedis = null;try {shardedJedis =  Redisservice.getsharejedispoolconnection (); Shardedjedis.set (Key, value);}  catch  (throwable e)  {e.printstacktrace ();}  finally {shardedjedis.close ();}} Public string get (String key)  {shardedjedis shardedjedis = null;try { Shardedjedis = redisservice.getsharejedispoolconnection (); Return shardedjedis.get (key);}  catch  (throwable e)  {e.printstacktrace ();}  finally {shardedjedis.close ();} Return null;} Public boolean del (String key)  {shardedjedis shardedjedis = null;try { Shardedjedis = redisservice.getsharejedispoolconNection (); Return shardedjedis.del (key)  > 0 ? true : false;}  catch  (throwable e)  {e.printstacktrace ();}  finally {shardedjedis.close ();} Return false;} Public redisservice getredisservice ()  {return redisservice;} Public void setredisservice (Redisservice redisservice)  {this.redisService =  Redisservice;}}

    spring-application.xml configuration file

<?xml version= "1.0"  encoding= "UTF-8"? ><beans xmlns= "http://www.springframework.org/ Schema/beans "xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance " xmlns:aop="/HTTP/ Www.springframework.org/schema/aop "xsi:schemalocation=" http://www.springframework.org/schema/beans      http://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp:// www.springframework.org/schema/aop     http://www.springframework.org/schema/aop/ Spring-aop-3.0.xsd "xmlns:p=" http://www.springframework.org/schema/p "><bean id=" Propertyconfigurer "  class= "Org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" ><property name = "Location" >    <value>config/redis.properties</value></property>< /bean><bean id= "Jedispoolconfig"  class= "Org.apache.commons.pool2.impl.GenericObjectPoolConfig" ><property name= "Maxtotal"  value= "${redis.mAxtotal} "></property><property name=" Maxidle " value=" ${redis.maxidle} "></property ><property name= "Minidle"  value= "${redis.minidle}" ></property><property name= "Maxwaitmillis"  value= "${redis.maxwaitmillis}" ></property><property name= "TestOnBorrow"  value= "${redis.testonborrow}" ></property></bean><bean id= "JedisShardInfo01"   class= "Redis.clients.jedis.JedisShardInfo" ><constructor-arg value= "${redis.host.shard01}" ></ Constructor-arg><constructor-arg value= "${REDIS.PORT.SHARD01}" ></constructor-arg>< Constructor-arg value= "${redis.timeout}" ></constructor-arg></bean><bean id= " JedisShardInfo02 " class=" Redis.clients.jedis.JedisShardInfo "><constructor-arg value=" ${ REDIS.HOST.SHARD02} "></constructor-arg><constructor-arg value=" ${redis.port.shard02} ">< /constructor-arg><construCtor-arg value= "${redis.timeout}" ></constructor-arg></bean><bean id= "RedisService"  class= "Com.shma.redis.RedisService"  init-method= "init" ><property name= "Jedispoolconfig" ><ref bean= "Jedispoolconfig"/></property><property name= "JedisShardInfos" >< List><ref bean= "jedisShardInfo01"/><ref bean= "jedisShardInfo02"/></list></ Property></bean><bean id= "Rediscache"  class= "Com.shma.redis.RedisCache" ><property  name= "Redisservice" ><ref bean= "Redisservice"/></property></bean></beans>

Redis.properties configuration file

#客户端超时时间单位是毫秒redis. timeout=10000# maximum number of connections redis.maxtotal=5000# minimum idle number redis.minidle=100# maximum idle number redis.maxidle=5000# Maximum Setup connection wait time redis.maxwaitmillis=5000redis.testonborrow=falseredis.host.shard01=183.131.6.62redis.port.shard01= 6379redis.host.shard02=127.0.0.1redis.port.shard02=6379

2, found in the Redis.clients.jedis source code, implementation of distributed if there is a server rock machine, it will lead to the entire distribution can not be used

Modify the Redis.clients.jedis. Jedisshardinfo class

@Override public Jedis Createresource () {Jedis Jedis = new Jedis (this);    try {if ("Pong". Equals (Jedis.ping ())) {jedis.select (db);        return Jedis;    }} catch (Throwable e) {System.out.println ("Connection exception = +" + gethost () + ":" + getport () + ":" + db);  } return null; }

Modifying the Redis.clients.util.Sharded class

Private void initialize (list<s> shards)  {    nodes =  New treemap<long, s> ();    for  (int i = 0; i  != shards.size ();  ++i)  {        final s  shardinfo = shards.get (i);         r r =  shardinfo.createresource ();        //  If a redis failure is created, Automatically rejects the Rock machine server         if  (r != null)  {             if  (Shardinfo.getname ()  == null)         for  (int n = 0; n < 160  * shardinfo.getweight ();  n++)  {    nodes.put (This.algo.hash ("SHARD-")  + i +  "-node-" &NBSP;+&Nbsp;n),  shardinfo);        }    else             for  (int n = 0; n  < 160 * shardinfo.getweight ();  n++)  {    nodes.put ( This.algo.hash (Shardinfo.getname ()  +  "*"  + shardinfo.getweight ()  + n),  Shardinfo);         }    resources.put (ShardInfo, &NBSP;R);         }    }}

Select DB is not supported in the default Redis distributed implementation, you can also modify the constructor, pass in the DB, and distribute in multiple db of a Redis

Java-no.13 based on Redis distributed cache implementation