第0章:简介
(1)maven配置:
<dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>2.1.0</version> <type>jar</type> <scope>compile</scope> </dependency> |
(2)简单测试
Jedis jedis = new Jedis( "localhost" ); jedis.set( "foo" , "bar" ); String value = jedis.get( "foo" );
|
(3)参考网站
Jedis官网:https://github.com/xetorthio/jedis
Jedis开源中国:http://www.oschina.net/p/jedis
大V博客:http://snowolf.iteye.com/blog/1633196
(4)札记
1)目前Redis大概有3中基于Java语言的Client,分别是Jredis,Jedis,Redis4J,这里只说Jedis,因为它是官方提供的唯一Redis Client For Java Provider。
第1章:Jedis实践
这里假设Redis已经正常运行,redis的具体安装可以参考“Redis基础”章节。下面就2.1.0版jedis作为redis的java客户端进行封装和测试,具体如下:
(1)Redis客户端(RedisClient.java)
package com.mcc.core.redis;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import redis.clients.jedis.*;
import redis.clients.jedis.exceptions.JedisConnectionException;
import redis.clients.util.Slowlog;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
/**
* Redis客户端,基于Jedis,用到jedis包
* 单列模式, 建议应用与Redis集群部署在同一台服务器上,以获得最佳性能
*
* @author <a href="mailto:417877417@qq.com">menergy</a>
* DateTime: 13-12-21 下午2:09
*/
public class RedisClient {
// members
private static Logger logger = LoggerFactory.getLogger(RedisClient.class);
// 单例
private static RedisClient instance;
// 默认超时时间
private int defaultTimeout = 10000;
// Redis集群,写节点,Master
private JedisPool masterPool;
// 默认Master IP
private String masterHost = "127.0.0.1";
// 默认端口
private int masterPort = 6379;
// Redis集群, 读节点,Slaves
private Map<Integer, JedisPool> slavePools;
//
private static int poolIndex = 1;
// 连接密码
private String password;
// 当前数据库
private int database;
// Redis Master Server 状态 -1 : 连接失败,0 : 未连接,1 : 连接成功
private int writeStatus = 0;
// Redis slave Server 状态 -1 : 连接失败,0 : 未连接,1 : 连接成功
private int readStatus = 0;
//
private int delayRetry = 10;
//
private AliveEventListener aliveEventListener;
//
private ExecutorService executor;
// static block
// constructors
/**
* 默认构造器<br/>
* 当应用与Redis集群为同一台服务器时使用
*/
private RedisClient() {
this("127.0.0.1", 6379);
}
/**
* 指定Master实例地址端口<br/>
* 当应用与Redis集群为不同服务器时使用,如开发测试时
*
* @param host Master IP
* @param port Master PORT
*/
private RedisClient(String host, int port) {
this(host, port, null, 0);
}
/**
* 指定Master实例地址端口,密码,数据库<br/>
* 适用一套Redis集群支撑多套应用
*
* @param host Master IP
* @param port Master PORT
* @param password Redis密码
* @param database 数据库
*/
private RedisClient(String host, int port, String password, Integer database) {
this.masterHost = host;
this.masterPort = port;
this.password = password != null && password.isEmpty() ? null : password;
this.database = database == null ? 0 : database;
// 连接集群
this.connectRedis();
this.executor = Executors.newFixedThreadPool(2, new SubscribeThreadFactory());
// 检查集群是否在线
this.checkAlive();
}
// properties
public int getDatabase() {
return database;
}
/**
* 是否可以写入状态
*
* @return 写入状态
*/
public int getWriteStatus() {
return writeStatus;
}
/**
* 是否可以读入状态
*
* @return 读入状态
*/
public int getReadStatus() {
return readStatus;
}
/**
* 存活事件
*
* @param aliveEventListener
*/
public void setAliveEventListener(AliveEventListener aliveEventListener) {
this.aliveEventListener = aliveEventListener;
}
// public methods
/**
* 获得取实例
*
* @return 返回一个Client实例
*/
public static RedisClient getInstance() {
if (instance == null) {
instance = new RedisClient();
}
return instance;
}
/**
* 获得取实例
*
* @param host Master IP
* @param port Master PORT
* @return 返回一个Client实例
*/
public static RedisClient getInstance(String host, int port) {
if (instance == null) {
instance = new RedisClient(host, port);
}
return instance;
}
/**
* 获得取实例
*
* @param host Master IP
* @param port Master PORT
* @param password 连接密码, 允许空
* @return 返回一个Client实例
*/
public static RedisClient getInstance(String host, int port, String password) {
if (instance == null) {
instance = new RedisClient(host, port, password, 0);
}
return instance;
}
/**
* 获得取实例
*
* @param host Master IP
* @param port Master PORT
* @param password 连接密码, 允许空
* @param database 数据库
* @return 返回一个Client实例
*/
public static RedisClient getInstance(String host, Integer port, String password, Integer database) {
if (instance == null) {
instance = new RedisClient(host, port, password, database);
}
return instance;
}
/**
* 获得SlavePool
*
* @return 返回slave连接池
*/
public JedisPool getSlavePool() {
JedisPool pool = slavePools.get(poolIndex);
poolIndex += 1;
if (poolIndex > slavePools.size()) poolIndex = 1;
return pool;
}
/**
* 检查给定 key 是否存在
*
* @param key 键
* @return 若 key 存在,返回 1 ,否则返回 0
*/
public boolean exists(final String key) {
Object actual = slave(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.exists(key);
}
});
return actual != null ? (Boolean) actual : false;
}
/**
* 查看哈希表 key 中,给定域 field 是否存在
*
* @param key 键
* @param field 域
* @return 如果哈希表含有给定域,返回 1, 若不含有给定域,或 key 不存在,返回 0
*/
public boolean hexists(final String key, final String field) {
Object actual = slave(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.hexists(key, field);
}
});
return actual != null ? (Boolean) actual : false;
}
/**
* 返回哈希表 key 中给定域 field 的值
*
* @param key 键
* @param field 域
* @return 给定域的值, 当给定域不存在或是给定 key 不存在时,返回 nil
*/
public String hget(final String key, final String field) {
Object actual = slave(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.hget(key, field);
}
});
return actual != null ? actual.toString() : null;
}
/**
* 返回哈希表 key 中域的数量
*
* @param key 键
* @return 哈希表中域的数量, 当 key 不存在时,返回 0
*/
public Long hlen(final String key) {
Object actual = slave(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.hlen(key);
}
});
return actual != null ? Long.valueOf(actual.toString()) : null;
}
/**
* 返回哈希表 key 中的所有域
*
* @param key 键
* @return 一个包含哈希表中所有域的表, 当 key 不存在时,返回一个空表
*/
public Set<String> hkeys(final String key) {
Object actual = slave(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.hkeys(key);
}
});
return actual != null ? (Set<String>) actual : null;
}
/**
* 返回哈希表 key 中所有域的值
*
* @param key 键
* @return 一个包含哈希表中所有值的表, 当 key 不存在时,返回一个空表
*/
public List<String> hvals(final String key) {
Object actual = slave(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.hvals(key);
}
});
return actual != null ? (List<String>) actual : null;
}
/**
* 返回哈希表 key 中,所有的域和值
*
* @param key 键
* @return 以列表形式返回哈希表的域和域的值, 若 key 不存在,返回空列表
*/
public Map<String, String> hgetAll(final String key) {
Object actual = slave(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.hgetAll(key);
}
});
return actual != null ? (Map<String, String>) actual : null;
}
/**
* 查找所有符合给定模式 pattern 的 key<br/>
* <pre>
* KEYS * 匹配数据库中所有 key 。
* KEYS h?llo 匹配 hello , hallo 和 hxllo 等。
* KEYS h*llo 匹配 hllo 和 heeeeello 等。
* KEYS h[ae]llo 匹配 hello 和 hallo ,但不匹配 hillo
* </pre>
*
* @param pattern 模式
* @return 符合给定模式的 key 列表
*/
public Set<String> keys(final String pattern) {
Object actual = master(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.keys(pattern);
}
});
return actual != null ? (Set<String>) actual : null;
}
/**
* 删除给定的一个或多个 key<br/>
* 不存在的 key 会被忽略
*
* @param keys 缓存名称
* @return 被删除 key 的数量
*/
public Long del(final String... keys) {
Object actual = master(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.del(keys);
}
});
return actual != null ? (Long) actual : null;
}
/**
* 将信息 message 发送到指定的频道 channel
*
* @param channel 频道
* @param command 指令
* @param message 指令内容
* @return
*/
public Long publish(final String channel, final String command, final String message) {
long actual = 0;
if (command != null && message != null) {
actual = publish(channel, String.format("%s %s", command, message));
}
return actual;
}
/**
* 将信息 message 发送到指定的频道 channel
*
* @param channel 频道
* @param message 信息
* @return
*/
public Long publish(final String channel, final String message) {
Object actual = master(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.publish(channel, message);
}
});
return actual != null ? (Long) actual : 0;
}
/**
* 从频道channels订阅信息message<br/>
* 订阅会阻塞进程,因此开一个新线程来执行, 注意不要频繁调用该方法
*
* @param handler 消息处理器
* @param channels 频道
*/
public void subscribe(final JedisPubSub handler, final String... channels) {
// 订阅会阻塞进程,因此开一个新线程来执行
executor.execute(new Runnable() {
@Override
public void run() {
int delayRetry = 10;
JedisShardInfo info = new JedisShardInfo(masterHost, masterPort, defaultTimeout);
if (password != null) {
info.setPassword(password);
}
// jedis.select(database); 每个Redis Server只有一套订阅,与数据库无关,不需要关注select 那个database
while (true) {
try {
Jedis jedis = new Jedis(info);
jedis.subscribe(handler, channels);
} catch (JedisConnectionException e) {
writeStatus = -1;
if (logger.isErrorEnabled()) {
logger.error("redis db connection reset ! please check it , {} second after reconnect !", delayRetry);
}
sleep(delayRetry);
}
}
}
});
}
/**
* 查看Redis数据库连接是否正常
*
* @return 返回是否正常
*/
public boolean pingMaster() {
Object actual = master(new Action() {
@Override
public Object execute(final Jedis jedis) {
String pong = null;
try {
pong = jedis.ping();
} catch (Exception ignored) {
}
return pong;
}
});
return true;
}
/**
* 查看Redis数据库连接是否正常
*
* @return 返回是否正常
*/
public boolean pingSlave() {
Object actual = slave(new Action() {
@Override
public Object execute(final Jedis jedis) {
String pong = null;
try {
pong = jedis.ping();
} catch (Exception ignored) {
}
return pong;
}
});
return true;
}
/**
* 返回当前数据库的 key 的数量
*
* @return 当前数据库的 key 的数量
*/
public Long dbSize() {
Object actual = master(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.dbSize();
}
});
return actual != null ? (Long) actual : null;
}
/**
* 执行一个 AOF文件 重写操作
*
* @return Status code reply
*/
public String bgrewriteaof() {
Object actual = master(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.bgrewriteaof();
}
});
return actual != null ? (String) actual : null;
}
/**
* 保存当前数据库的数据到磁盘
*
* @return Status code reply
*/
public String bgsave() {
Object actual = master(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.bgsave();
}
});
return actual != null ? (String) actual : null;
}
/**
* 将当前 Redis 实例的所有数据快照(snapshot)以 RDB 文件的形式保存到硬盘(采用同步方式,一般不用)
*
* @return Status code reply
*/
public String save() {
Object actual = master(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.save();
}
});
return actual != null ? (String) actual : null;
}
/**
* 获得最近一次 Redis 成功将数据保存到磁盘的时间
*
* @return Status code reply
*/
public Long lastSave() {
Object actual = master(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.lastsave();
}
});
return actual != null ? (Long) actual : null;
}
/**
* 将当前服务器转变为指定服务器的从属服务器(slave server)
*
* @param host 从属服务器ip
* @param port 从属服务器端口
* @return Status code reply
*/
public String slaveof(final String host, final Integer port) {
Object actual = slave(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.slaveof(host, port);
}
});
return actual != null ? (String) actual : null;
}
/**
* 关闭从属服务器的复制功能
*
* @return Status code reply
*/
public String slaveofNoOne() {
Object actual = slave(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.slaveofNoOne();
}
});
return actual != null ? (String) actual : null;
}
/**
* 清空整个 Redis 服务器的数据(删除所有数据库的所有 key ,此命令从不失败)
*
* @return Status code reply
*/
public String flushAll() {
Object actual = master(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.flushAll();
}
});
return actual != null ? (String) actual : null;
}
/**
* 清空当前数据库中的所有 key(此命令从不失败)
*
* @return Status code reply
*/
public String flushDB() {
Object actual = master(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.flushDB();
}
});
return actual != null ? (String) actual : null;
}
/**
* 停止所有客户端
*
* @return Status code reply
*/
public String shutdown() {
Object actual = master(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.shutdown();
}
});
return actual != null ? (String) actual : null;
}
/**
* 获取查询日志
*
* @return Status code reply
*/
public List<Slowlog> slowlogGet() {
Object actual = slave(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.slowlogGet();
}
});
return actual != null ? (List<Slowlog>) actual : null;
}
/**
* 获取指定数量的查询日志
*
* @param entries 日志数量
* @return 日志
*/
public List<Slowlog> slowlogGet(final Long entries) {
Object actual = slave(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.slowlogGet(entries);
}
});
return actual != null ? (List<Slowlog>) actual : null;
}
/**
* 查看当前日志的数量
*
* @return 当前日志的数量
*/
public Long slowlogLen() {
Object actual = slave(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.slowlogLen();
}
});
return actual != null ? (Long) actual : null;
}
/**
* 清空日志
*
* @return 清空日志
*/
public byte[] slowlogReset() {
Object actual = master(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.slowlogReset();
}
});
return actual != null ? (byte[]) actual : null;
}
/**
* 返回关于 Redis 服务器的各种信息和统计值
*
* @return Redis 服务器的各种信息和统计值
*/
public String info() {
Object actual = master(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.info();
}
});
return actual != null ? (String) actual : null;
}
/**
* 获取服务器的配置参数
*
* @param pattern 参数
* @return 参数表
*/
public List<String> configGet(final String pattern) {
Object actual = slave(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.configGet(pattern);
}
});
return actual != null ? (List<String>) actual : null;
}
/**
* 动态改变服务器参数(无需重启,即刻生效)
*
* @param parameter 参数名
* @param value 参数值
* @return Status code reply
*/
public String configSet(final String parameter, final String value) {
Object actual = master(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.configSet(parameter, value);
}
});
return actual != null ? (String) actual : null;
}
/**
* 重置 INFO 命令中的某些统计数据
*
* @return Status code reply
*/
public String configResetstart() {
Object actual = master(new Action() {
@Override
public Object execute(final Jedis jedis) {
return jedis.configResetStat();
}
});
return actual != null ? (String) actual : null;
}
/**
* Redis查询,保证只从Slave查询
*
* @param action 操作
* @return 返回查询结果
*/
public Object slave(Action action) {
Object actual = null;
if (slaveOnline()) {
JedisPool pool = null;
Jedis jedis = null;
try {
pool = this.getSlavePool();
if (pool != null) {
jedis = pool.getResource();
actual = action.execute(jedis);
} else {
this.readStatus = -1;
}
} catch (JedisConnectionException e) {
int osize = slavePools.size();
initSlaves(getDefaultConfig());
int nsize = slavePools.size();
this.readStatus = slavePools.isEmpty() ? -1 : 1;
if (osize != nsize && logger.isErrorEnabled()) {
logger.error("slave instance size changed! {} to {}", osize, nsize);
}
} finally {
if (pool != null) {
pool.returnResource(jedis);
}
}
}
return actual;
}
/**
* 更新或插入数据,只从Master写入数据<br/>
* 若要使用方式Jedis的select方法临时切换数据库,请使用该方法
*
* @param action 操作
* @return 返回操作结果
*/
public Object master(Action action) {
Object actual = null;
if (masterOnline()) {
JedisPool pool = null;
Jedis jedis = null;
try {
pool = this.getMasterPool();
jedis = pool.getResource();
actual = action.execute(jedis);
} catch (JedisConnectionException e) {
this.writeStatus = -1;
if (logger.isErrorEnabled()) {
logger.error("redis db connection reset ! please checkAlive it !");
}
} finally {
if (pool != null) {
pool.returnResource(jedis);
}
}
}
return actual;
}
// protected methods
/**
* 获得MasterPool
*
* @return
*/
public JedisPool getMasterPool() {
return masterPool;
}
// friendly methods
// private methods
/**
* master配置
*
* @param config 配置
*/
private void initMaster(JedisPoolConfig config) {
try {
masterPool = new JedisPool(config, this.masterHost, this.masterPort, this.defaultTimeout, this.password, this.database);
Jedis jedis = masterPool.getResource();
jedis.ping();
masterPool.returnResource(jedis);
writeStatus = 1;
if (logger.isInfoEnabled()) {
logger.info("redis master connected !");
}
} catch (JedisConnectionException e) {
writeStatus = -1;
if (logger.isErrorEnabled()) {
logger.error("redis master connection reset ! please check it , {} second after reconnect !", delayRetry);
}
}
}
/**
* slave配置
*
* @param config 配置
*/
private void initSlaves(final JedisPoolConfig config) {
if (masterPool != null) {
slavePools = new HashMap<Integer, JedisPool>();
master(new Action() {
@Override
public Object execute(Jedis jedis) {
String info = jedis.info();
String[] lines = info.split("\r\n");
for (String line : lines) {
if (line.contains("slave") && line.contains("online")) {
String[] online = line.split(":")[1].split(",");
String host = online[0];
String port = online[1];
// 处理当应用与redis不在同一台服务器上的情况
if("127.0.0.1".equalsIgnoreCase(host)){
host = masterHost;
}
jedis.hset("redis.slave", host, port);
JedisPool pool = null;
Jedis slave = null;
try {
pool = new JedisPool(config, host, Integer.valueOf(port), defaultTimeout, password, database);
slave = pool.getResource();
slavePools.put(slavePools.size() + 1, pool);
} catch (JedisConnectionException e) {
if (logger.isErrorEnabled()) {
logger.error("slave: {}", e.getMessage());
}
} finally {
if (pool != null && slave != null) {
pool.returnResource(slave);
}
}
}
}
// 更新slave节点状态
readStatus = !slavePools.isEmpty() ? 1 : -1;
switch (readStatus) {
case -1:
if (logger.isErrorEnabled()) {
logger.error("redis slave connection reset ! please check it , {} second after reconnect !", delayRetry);
}
break;
case 1:
if (logger.isInfoEnabled()) {
logger.info("redis slave connected!");
}
break;
}
return readStatus;
}
});
}
}
/**
* 返回一个默认的JedisPoolConfig
*
* @return 返回一个默认的JedisPoolConfig
*/
private JedisPoolConfig getDefaultConfig() {
// 连接配置
JedisPoolConfig config = new JedisPoolConfig();
config.setMaxActive(100);
config.setMaxIdle(20);
config.setMaxWait(10000);
// 设定在借出对象时是否进行有效性检查
config.setTestOnBorrow(true);
return config;
}
/**
* 连接Redis Cluster
*/
private void connectRedis() {
if (writeStatus != 1) {
initMaster(getDefaultConfig());
initSlaves(getDefaultConfig());
}
if (readStatus != 1) {
initSlaves(getDefaultConfig());
}
// 解发事件
if (this.aliveEventListener != null) {
this.aliveEventListener.onEvents(masterOnline(), slaveOnline());
}
}
/**
* 检查集群是否存活
*
* @return
*/
private void checkAlive() {
executor.execute(new Runnable() {
@Override
public void run() {
while (true) {
try {
connectRedis();
sleep(delayRetry);
} catch (JedisConnectionException e) {
if (logger.isErrorEnabled()) {
logger.error("redis db connection reset ! please check it , {} second after reconnect !", delayRetry);
}
sleep(delayRetry);
}
}
}
});
}
/**
* Master连接池是否在线
*
* @return 若没初化成功则返回 false, 若成功则返回 true
*/
private boolean masterOnline() {
return this.writeStatus == 1;
}
/**
* Slave连接池是否在线
*
* @return 若没初化成功则返回 false, 若成功则返回 true
*/
private boolean slaveOnline() {
return this.readStatus == 1;
}
/**
* 休眠指定时间
*
* @param second 休眠秒数
*/
private void sleep(int second) {
try {
TimeUnit.SECONDS.sleep(second);
} catch (InterruptedException ignored) {
}
}
// inner class
/**
* Redis Cluster 存活状态发生变化事件监听器
*/
public interface AliveEventListener {
/**
* Redis Cluster 存活状态发生变化事件<br/>
* 每十秒触发一次
*
* @param masterAlive Redis Master Server是否存活
* @param slaveAlive Redis Slave Server 是否存活
*/
void onEvents(boolean masterAlive, boolean slaveAlive);
}
// test main
}
(2)Jedis查询接口(Action.java)
package com.mcc.core.redis;
import redis.clients.jedis.Jedis;
/**
* Jedis查询接口
*
* @author <a href="mailto:417877417@qq.com">menergy</a>
* DateTime: 13-12-21 下午2:28
*/
public interface Action {
/**
* Redis 通用查询
*
* @param jedis redis客户端
* @return
*/
Object execute(final Jedis jedis);
}
(3)Redis命令的发布订阅(CommandHandler.java)
package com.mcc.core.redis;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import redis.clients.jedis.JedisPubSub;
/**
* 通过Redis的发布订阅机制实现实时指令控制台
*
* @author <a href="mailto:417877417@qq.com">menergy</a>
* DateTime: 13-12-21 下午2:34
*/
public class CommandHandler extends JedisPubSub {
private static Logger logger = LoggerFactory.getLogger(CommandHandler.class);
//频道,也可以用配置文件配置
public static final String COMMAND_CHANNEL = "execute";
//命令,可以自定义命令
public static final String COMMAND = "loadall";
/**
* 指令频道名称
*/
private String channel;
/**
* 指令消息
*/
private String message;
public CommandHandler() {
}
/**
* 处理指令消息事件
*
* @param channel 指令频道名称
* @param message 指令消息
*/
@Override
public void onMessage(String channel, String message) {
this.channel = channel;
this.message = message;
try {
if (channel != null && channel.equalsIgnoreCase(COMMAND_CHANNEL)) {
if (message != null && !message.isEmpty()) {
String cmd = message, content = "";
int length = message.length(), delimiter = message.indexOf(" ");
if (delimiter != -1) {
int start = delimiter + 1 > length ? length : delimiter + 1;
cmd = message.substring(0, delimiter); // 指令
content = message.substring(start, length); // 指令内容
}
// 更新全部缓存
if (cmd.equalsIgnoreCase(COMMAND)) {
logger.info("该命令下的操作逻辑");
//执行该命令下的相应操作,具体这里暂不实现
}
}
}
} catch (Exception e) {
if (logger.isErrorEnabled()) {
logger.error("failure to execute command '{}' , cause: {}!", message, e.getMessage());
}
}
}
@Override
public void onPMessage(String pattern, String channel, String message) {
// TODO Auto-generated method stub
}
@Override
public void onPSubscribe(String pattern, int subscribedChannels) {
// TODO Auto-generated method stub
}
@Override
public void onPUnsubscribe(String pattern, int subscribedChannels) {
// TODO Auto-generated method stub
}
@Override
public void onSubscribe(String channel, int subscribedChannels) {
// TODO Auto-generated method stub
}
@Override
public void onUnsubscribe(String channel, int subscribedChannels) {
// TODO Auto-generated method stub
}
public String getChannel() {
return channel;
}
public void setChannel(String channel) {
this.channel = channel;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
}
(4)异常处理类(SubscribeThreadFactory.java)
package com.mcc.core.redis;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
/**
* 带异常处处理器的ThreaFactory
*
* @author <a href="mailto:417877417@qq.com">menergy</a>
* DateTime: 13-12-21 下午2:19
*/
public class SubscribeThreadFactory implements ThreadFactory {
// members
private static Logger logger = LoggerFactory.getLogger(SubscribeThreadFactory.class);
static final AtomicInteger poolCounter = new AtomicInteger(1);
final AtomicLong threadCounter = new AtomicLong(1);
final ThreadGroup group;
final String namingPattern;
// static block
// constructors
public SubscribeThreadFactory() {
SecurityManager securityManager = System.getSecurityManager();
group = (securityManager != null) ? securityManager.getThreadGroup() : Thread.currentThread().getThreadGroup();
namingPattern = "redis-" + poolCounter.getAndIncrement() + "-subscribe-thread-";
}
// properties
// public methods
@Override
public Thread newThread(Runnable r) {
Thread worker = new Thread(group, r, namingPattern + threadCounter.getAndIncrement(), 0);
worker.setUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
@Override
public void uncaughtException(Thread t, Throwable e) {
if (logger.isErrorEnabled()) {
logger.error(e.getMessage(), e);
}
}
});
if (worker.isDaemon()) {
worker.setDaemon(false);
}
if (worker.getPriority() != Thread.NORM_PRIORITY) {
worker.setPriority(Thread.NORM_PRIORITY);
}
return worker;
}
// protected methods
// friendly methods
// private methods
// inner class
// test main
}
(5)Jedis客户端测试类(RedisTest.java)
package com.mcc.core.test;
import com.mcc.core.redis.CommandHandler;
import com.mcc.core.redis.RedisClient;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* redis测试类
*
* @author <a href="mailto:417877417@qq.com">menergy</a>
* DateTime: 13-12-21 下午2:51
*/
public class RedisTest {
public static void main() {
final RedisClient redisClient = RedisClient.getInstance("192.168.8.69", 6379, "", 1);
//
final AtomicBoolean needLoad = new AtomicBoolean(true);
// 监听Redis Cluster 存活状态
redisClient.setAliveEventListener(new RedisClient.AliveEventListener() {
/**
* Redis Cluster 存活状态发生变化事件<br/>
* 每十秒触发一次
*
* @param masterAlive Redis Master Server是否存活
* @param slaveAlive Redis Slave Server 是否存活
*/
@Override
public void onEvents(boolean masterAlive, boolean slaveAlive) {
if (masterAlive) {
// 确认Redis Cluster 后初始化配置
if (needLoad.get()) {
// 通过Redis的发布订阅实现指令系统
CommandHandler handler = new CommandHandler();
// 指令信道名称
String channel = CommandHandler.COMMAND_CHANNEL;
// 注册指令信道服务
redisClient.publish(channel, "");
// 订阅并监听指令信道
redisClient.subscribe(handler, channel);
// 标记为已配置
needLoad.set(false);
}
} else {
// 继续等待Redis Cluster存活通知
}
}
});
}
}