Redis线程池及分布式

在大型的互联网网站中，单机的Redis往往是不支持大并发的，很多时候都需要分布式以及集群来降低服务器崩溃造成整个网站的停止运行，所以，Redis也是需要进行分布式以及集群去防范这种现象的发生。

我们需要一些依赖：

 <span style="white-space:pre"> </span><dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.13</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.13</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>org.jmock</groupId>
<artifactId>jmock-junit4</artifactId>
<version>2.8.1</version>
</dependency>
<dependency>
<groupId>org.jmock</groupId>
<artifactId>jmock</artifactId>
<version>2.8.1</version>
</dependency>
<dependency>
<groupId>org.jmock</groupId>
<artifactId>jmock-legacy</artifactId>
<version>2.8.1</version>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.8.0</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-pool2</artifactId>
<version>2.4.2</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.4</version>
</dependency>
</dependencies>

1、首先，创建一个Config

package jmust.redis.RedisPool;


/**
 * 
 * @author LK
 *
 */
public class RedisConfig {


private static final int redisPort = 6379;
private static final String redisAdress = "127.0.0.1,192.168.100.117";
private static final int maxIdle = 10;
private static final int maxTotal = 30;
private static final int maxWaitMillis = 3000;
private static final int db = 3;
private static final String scheme = "http://";

public static int getRedisport() {
return redisPort;
}
public static String getRedisadress() {
return redisAdress;
}
public static int getMaxidle() {
return maxIdle;
}
public static int getMaxtotal() {
return maxTotal;
}
public static int getMaxwaitmillis() {
return maxWaitMillis;
}
public static int getDb() {
return db;
}
public static String getScheme() {
return scheme;
}

}

2、Redis工具类

package jmust.redis.RedisPool;


import java.util.ArrayList;
import java.util.List;


import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


import redis.clients.jedis.JedisPoolConfig;
import redis.clients.jedis.JedisShardInfo;
import redis.clients.jedis.ShardedJedis;
import redis.clients.jedis.ShardedJedisPool;


/**
 * 
 * @author LK
 *
 */
public class RedisUtil {
private static final Logger log = LoggerFactory.getLogger(RedisUtil.class);
public static ShardedJedisPool pool;

static {
createJedisPool();
}

/**
* init jedis pool
*/
private static void createJedisPool(){
try{
List<JedisShardInfo> shards = new ArrayList<JedisShardInfo>();
String[] address = (String[])getRedisAddress(RedisConfig.getRedisadress());
for (int i = 0; i <address.length; i++) {
 shards.add(new JedisShardInfo(address[i],RedisConfig.getRedisport()));
 }
// 生成连接池配置信息
JedisPoolConfig config = new JedisPoolConfig();
config.setMaxIdle(RedisConfig.getMaxidle());
config.setMaxTotal(RedisConfig.getMaxtotal());
config.setMaxWaitMillis(RedisConfig.getMaxwaitmillis());
// 在应用初始化的时候生成连接池
pool = new ShardedJedisPool(config, shards);
}catch(Exception e){
log.error("createJedisPool ",e);
}
}

/**
* get pool
* @return
*/
public static ShardedJedisPool getShardedPool(){
if(pool == null){
createJedisPool();
}
return pool;
}

public static ShardedJedis getShardedJedis(){
ShardedJedis jedis = null;
try{
jedis = getShardedPool().getResource();
}catch(Exception e){
log.error("getPool().getResource() error", e);
}
return jedis;
}

private static  Object getRedisAddress(String redisAddress){
Object address = null;
if(StringUtils.isNoneBlank(redisAddress)&&redisAddress.contains(",")){
address = redisAddress.split(",");
}else{
address = redisAddress.toCharArray();
}
return address;
}



}

3、单元测试

package jmust.redis.RedisPool;


import org.junit.Test;


import redis.clients.jedis.ShardedJedis;


/**
 * Unit test for simple RedisUtil.
 */
public class RedisTest 
{
@Test
public void redisTest(){
// 在业务操作时，从连接池获取连接
ShardedJedis client = null;
try {
client = RedisUtil.getShardedPool().getResource();
   // 执行指令
   String result = client.set("key-string212", "Hello, Redis!");
   System.out.println( String.format("set指令执行结果2:%s", result) );
   String value = client.get("key-string212");
   System.out.println( String.format("get指令执行结果2:%s", value) );
} catch (Exception e) {
   // TODO: handle exception
} finally {
   // 业务操作完成，将连接返回给连接池
   if (null != client) {
    RedisUtil.getShardedPool().getResource().close();
   }
}
}
}