利用redis简单实现消息订阅和发布
https://blog.csdn.net/Xs15073722800/article/details/63683750
好久没写博客了,最近关于redis消费者,生产者的功能,看了很多的资料,个人觉得很多的MQ开源都很好用,redis相对小俏,简单实现,一下先介绍redis实现;
1, redis实现消息发布和订阅,
/**
* Created by SDingBa.xiong on 17-3-9.
*/
public class RedisMsgPubSubListener extends JedisPubSub {
<span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">final</span> Logger logger = LoggerFactory.getLogger(RedisMsgPubSubListener.class);
<span class="hljs-annotation">@Resource</span>
<span class="hljs-keyword">private</span> AdOriginalityMapper adOriginalityMapper;
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">unsubscribe</span>() {
<span class="hljs-keyword">super</span>.unsubscribe();
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">unsubscribe</span>(String... channels) {
<span class="hljs-keyword">super</span>.unsubscribe(channels);
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">subscribe</span>(String... channels) {
<span class="hljs-keyword">super</span>.subscribe(channels);
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">psubscribe</span>(String... patterns) {
<span class="hljs-keyword">super</span>.psubscribe(patterns);
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">punsubscribe</span>() {
<span class="hljs-keyword">super</span>.punsubscribe();
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">punsubscribe</span>(String... patterns) {
<span class="hljs-keyword">super</span>.punsubscribe(patterns);
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onMessage</span>(String channel, String message) {
logger.info(<span class="hljs-string">"channel={}, receives message={}"</span>, channel, message);
code...
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onPMessage</span>(String pattern, String channel, String message) {
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onSubscribe</span>(String channel, <span class="hljs-keyword">int</span> subscribedChannels) {
logger.info(<span class="hljs-string">"====start Sub ====== channel={}, receives subscribedChannels={}"</span>, channel, subscribedChannels);
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onPUnsubscribe</span>(String pattern, <span class="hljs-keyword">int</span> subscribedChannels) {
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onPSubscribe</span>(String pattern, <span class="hljs-keyword">int</span> subscribedChannels) {
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onUnsubscribe</span>(String channel, <span class="hljs-keyword">int</span> subscribedChannels) {
logger.info(<span class="hljs-string">"====end Sub ======= channel={}, receives subscribedChannels={}"</span>, channel, subscribedChannels);
}
}
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2 spring boot初始化;
@Configuration
@Component
public class RedisMQSub implements ApplicationListener<ContextRefreshedEvent> {
<span class="hljs-keyword">private</span> <span class="hljs-keyword">final</span> Logger logger = LoggerFactory.getLogger(RedisMQSub.class);
@Resource
<span class="hljs-keyword">private</span> RedisService redisService;
<span class="hljs-comment">// 运行 监听的 主机(123.56.86.1), 可以使用队列解决 多个服务器处理一个通知请求(先通过 MQ -> 处理队列)</span>
<span class="hljs-comment">// private static final String CRM_ACTIVE_HOSTNAME = "iZ25o9jw9hbZ";</span>
<span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">final</span> String CRM_ACTIVE_HOSTNAME = <span class="hljs-string">"su"</span>;
<span class="hljs-keyword">private</span> <span class="hljs-keyword">void</span> redisInit() {
<span class="hljs-comment">// 本地测试 ;</span>
<span class="hljs-comment">// Jedis jedis = new Jedis("localhost");</span>
<span class="hljs-comment">// System.out.println((redisService == null) + " redis server");</span>
<span class="hljs-comment">// RedisMsgPubSubListener listener = new RedisMsgPubSubListener();</span>
<span class="hljs-comment">// new Thread(() -> jedis.subscribe(listener, CreativeData.CREATIVE_ACTIVE_REDIS_MESSAGE_MQ)).start();</span>
<span class="hljs-comment">// listener.unsubscribe();//关闭监听</span>
}
@Override
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> onApplicationEvent(ContextRefreshedEvent event) {
redisInit();
}
}
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subscribe 会阻塞进程,,,,
jedis.public(通道名,消息体…) 既可以发布消息
a,上面模式适合 单一服务器使用,,如果是分布式多服务器,很多其他的MQ很好实现,redis需要使用到队列功能了(因为消息发布和订阅是一对多的模式(redis)),,,不能仅仅使用消息的订阅和发布处理数据了,只能使用消息的发布用来通知其他的分布式节点,进行抢占时向队列里面取数据,
e redis.lpush(); 和 redis.rpop() 可实现
o 工具类:
@Scope("singleton")
@Service
public class RedisService implements InitializingBean {
<span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">final</span> Logger LOGGER = LoggerFactory.getLogger(RedisService.class);
<span class="hljs-javadoc">/**
* Redis操作接口
*
*<span class="hljs-javadoctag"> @author</span> 林计钦
*<span class="hljs-javadoctag"> @version</span> 1.0 2013-6-14 上午08:54:14
*/</span>
<span class="hljs-annotation">@Resource</span>
<span class="hljs-keyword">private</span> SystemConfig systemConfig;
<span class="hljs-keyword">private</span> JedisPool pool = <span class="hljs-keyword">null</span>;
<span class="hljs-javadoc">/**
* 返还到连接池
*
*<span class="hljs-javadoctag"> @param</span> redis
*/</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">returnResource</span>(Jedis redis) {
<span class="hljs-keyword">if</span> (redis != <span class="hljs-keyword">null</span>) {
redis.close();
}
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">setNX</span>(String key, <span class="hljs-keyword">int</span> expired) {
Jedis jedis = <span class="hljs-keyword">null</span>;
<span class="hljs-keyword">int</span> result = <span class="hljs-number">0</span>;
<span class="hljs-keyword">try</span> {
jedis = pool.getResource();
result = jedis.setnx(key, <span class="hljs-string">"1"</span>).intValue();
jedis.expire(key, expired);
} <span class="hljs-keyword">catch</span> (CacheException e) {
LOGGER.error(<span class="hljs-string">"sedis_error.key:{}"</span>, key, e.getMessage());
} <span class="hljs-keyword">finally</span> {
returnResource(jedis);
}
<span class="hljs-keyword">return</span> result > <span class="hljs-number">0</span>;
}
<span class="hljs-keyword">public</span> List<String> <span class="hljs-title">brpop</span>(String key) {
Jedis jedis = <span class="hljs-keyword">null</span>;
List<String> listStr = Lists.newArrayList();
<span class="hljs-keyword">try</span> {
jedis = pool.getResource();
listStr = jedis.brpop(<span class="hljs-number">10</span>, key);
} <span class="hljs-keyword">catch</span> (CacheException e) {
LOGGER.error(<span class="hljs-string">"sedis_error.key:{}"</span>, key, e.getMessage());
} <span class="hljs-keyword">finally</span> {
returnResource(jedis);
}
<span class="hljs-keyword">return</span> listStr;
}
<span class="hljs-javadoc">/**
* 获取数据
*
*<span class="hljs-javadoctag"> @param</span> key
*<span class="hljs-javadoctag"> @return</span>
*/</span>
<span class="hljs-keyword">public</span> String <span class="hljs-title">getString</span>(String key) {
String value = <span class="hljs-keyword">null</span>;
Jedis jedis = <span class="hljs-keyword">null</span>;
<span class="hljs-keyword">try</span> {
jedis = pool.getResource();
value = jedis.get(key);
} <span class="hljs-keyword">catch</span> (Exception e) {
<span class="hljs-comment">// 释放redis对象</span>
<span class="hljs-keyword">if</span> (jedis != <span class="hljs-keyword">null</span>) {
jedis.close();
}
LOGGER.error(<span class="hljs-string">"jedis_pool_err"</span>, e);
} <span class="hljs-keyword">finally</span> {
<span class="hljs-comment">// 返还到连接池</span>
returnResource(jedis);
}
<span class="hljs-keyword">return</span> value;
}
<span class="hljs-javadoc">/**
* Strings结构:set command
*
*<span class="hljs-javadoctag"> @param</span> key
*<span class="hljs-javadoctag"> @param</span> object 存储object
*<span class="hljs-javadoctag"> @param</span> expired 过期时间(秒)
*/</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">setString</span>(String key, Object object, <span class="hljs-keyword">int</span> expired) {
Jedis jedis = <span class="hljs-keyword">null</span>;
<span class="hljs-keyword">try</span> {
jedis = pool.getResource();
jedis.setex(key, expired, String.valueOf(object));
<span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>;
} <span class="hljs-keyword">catch</span> (Exception e) {
LOGGER.error(<span class="hljs-string">"redis error:key:{};value{}"</span>, key, object, e);
} <span class="hljs-keyword">finally</span> {
returnResource(jedis);
}
<span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>;
}
<span class="hljs-javadoc">/**
* Hash结构:hset command
*
*<span class="hljs-javadoctag"> @param</span> key cache key
*<span class="hljs-javadoctag"> @param</span> field second key
*<span class="hljs-javadoctag"> @param</span> obj 直接存对象
*/</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">hset</span>(String key, String field, Object obj, <span class="hljs-keyword">int</span> expired) {
Jedis jedis = <span class="hljs-keyword">null</span>;
<span class="hljs-keyword">try</span> {
jedis = pool.getResource();
jedis.hset(key, field, JSON.toJSONString(obj));
jedis.expire(key.getBytes(), expired);
} <span class="hljs-keyword">catch</span> (CacheException e) {
LOGGER.error(<span class="hljs-string">"sedis_error.key:{}"</span>, key, e.getMessage());
} <span class="hljs-keyword">finally</span> {
returnResource(jedis);
}
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">afterPropertiesSet</span>() <span class="hljs-keyword">throws</span> Exception {
JedisPoolConfig config = <span class="hljs-keyword">new</span> JedisPoolConfig();
<span class="hljs-comment">// 控制一个pool可分配多少个jedis实例,通过pool.getResource()来获取;</span>
<span class="hljs-comment">// 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)。</span>
config.setMaxTotal(<span class="hljs-number">500</span>);
<span class="hljs-comment">// 控制一个pool最多有多少个状态为idle(空闲的)的jedis实例。</span>
config.setMaxIdle(<span class="hljs-number">5</span>);
<span class="hljs-comment">// 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;</span>
config.setMaxWaitMillis(<span class="hljs-number">1000</span> * <span class="hljs-number">100</span>);
<span class="hljs-comment">// 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;</span>
config.setTestOnBorrow(<span class="hljs-keyword">true</span>);
String redisIp = systemConfig.getRedisIp();
String redisPassword = systemConfig.getRedisPassword();
<span class="hljs-keyword">int</span> redisPort = systemConfig.getRedisPort();
pool = <span class="hljs-keyword">new</span> JedisPool(config, redisIp, redisPort, <span class="hljs-number">2000</span>, redisPassword);
}
<span class="hljs-javadoc">/**
* 获取数据
*
*<span class="hljs-javadoctag"> @param</span> key
*<span class="hljs-javadoctag"> @return</span>
*/</span>
<span class="hljs-keyword">public</span> Map<String, String> <span class="hljs-title">hgetAll</span>(String key) {
Map<String, String> value = <span class="hljs-keyword">null</span>;
Jedis jedis = <span class="hljs-keyword">null</span>;
<span class="hljs-keyword">try</span> {
jedis = pool.getResource();
value = jedis.hgetAll(key);
} <span class="hljs-keyword">catch</span> (Exception e) {
<span class="hljs-comment">// 释放redis对象</span>
<span class="hljs-keyword">if</span> (jedis != <span class="hljs-keyword">null</span>) {
jedis.close();
}
LOGGER.error(<span class="hljs-string">"jedis_pool_err"</span>, e);
} <span class="hljs-keyword">finally</span> {
<span class="hljs-comment">// 返还到连接池</span>
returnResource(jedis);
}
<span class="hljs-keyword">return</span> value;
}
<span class="hljs-keyword">public</span> String <span class="hljs-title">hget</span>(String key, String field) {
Jedis jedis = <span class="hljs-keyword">null</span>;
<span class="hljs-keyword">try</span> {
jedis = pool.getResource();
<span class="hljs-keyword">return</span> jedis.hget(key, field);
} <span class="hljs-keyword">catch</span> (CacheException e) {
LOGGER.error(<span class="hljs-string">"sedis_error.key:{}"</span>, key, e.getMessage());
} <span class="hljs-keyword">finally</span> {
returnResource(jedis);
}
<span class="hljs-keyword">return</span> <span class="hljs-string">""</span>;
}
<span class="hljs-keyword">public</span> Set<String> <span class="hljs-title">keys</span>(String field) {
Jedis jedis = <span class="hljs-keyword">null</span>;
<span class="hljs-keyword">try</span> {
jedis = pool.getResource();
<span class="hljs-keyword">return</span> jedis.hkeys(field);
} <span class="hljs-keyword">catch</span> (CacheException e) {
LOGGER.error(<span class="hljs-string">"redis_error.key:{}"</span>, field, e.getMessage());
} <span class="hljs-keyword">finally</span> {
returnResource(jedis);
}
<span class="hljs-keyword">return</span> <span class="hljs-keyword">null</span>;
}
<span class="hljs-javadoc">/**
* Hash结构:hset command
*
*<span class="hljs-javadoctag"> @param</span> key cache key
*<span class="hljs-javadoctag"> @param</span> field second key
*<span class="hljs-javadoctag"> @param</span> obj 直接存对象
*/</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">hset</span>(String key, String field, Object obj) {
Jedis jedis = <span class="hljs-keyword">null</span>;
<span class="hljs-keyword">try</span> {
jedis = pool.getResource();
jedis.hset(key, field, JSON.toJSONString(obj));
} <span class="hljs-keyword">catch</span> (CacheException e) {
LOGGER.error(<span class="hljs-string">"sedis_error.key:{}"</span>, key, e.getMessage());
} <span class="hljs-keyword">finally</span> {
returnResource(jedis);
}
}
<span class="hljs-javadoc">/**
* 存储REDIS队列 顺序存储
*
*<span class="hljs-javadoctag"> @param</span> key reids键名
*<span class="hljs-javadoctag"> @param</span> value 键值
*/</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">lpush</span>(String key, String value) {
Jedis jedis = <span class="hljs-keyword">null</span>;
<span class="hljs-keyword">try</span> {
jedis = pool.getResource();
jedis.lpush(key, value);
} <span class="hljs-keyword">catch</span> (Exception e) {
LOGGER.error(<span class="hljs-string">"sedis_error.key:{}"</span>, key, e);
} <span class="hljs-keyword">finally</span> {
returnResource(jedis);
}
}
<span class="hljs-javadoc">/**
* 获取队列数据
*
*<span class="hljs-javadoctag"> @param</span> key 键名
*/</span>
<span class="hljs-keyword">public</span> String <span class="hljs-title">rpop</span>(String key) {
String bytes = <span class="hljs-keyword">null</span>;
Jedis jedis = <span class="hljs-keyword">null</span>;
<span class="hljs-keyword">try</span> {
jedis = pool.getResource();
bytes = jedis.rpop(key);
} <span class="hljs-keyword">catch</span> (Exception e) {
LOGGER.error(<span class="hljs-string">"sedis_error.key:{}"</span>, key, e);
} <span class="hljs-keyword">finally</span> {
returnResource(jedis);
}
<span class="hljs-keyword">return</span> bytes;
}
<span class="hljs-javadoc">/**
* 获取 队列 长度
*
*<span class="hljs-javadoctag"> @param</span> key 队列名
*/</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">long</span> <span class="hljs-title">llen</span>(String key) {
<span class="hljs-keyword">long</span> bytes = <span class="hljs-number">0</span>;
Jedis jedis = <span class="hljs-keyword">null</span>;
<span class="hljs-keyword">try</span> {
jedis = pool.getResource();
bytes = jedis.llen(key);
} <span class="hljs-keyword">catch</span> (Exception e) {
LOGGER.error(<span class="hljs-string">"sedis_error.key:{}"</span>, key, e);
} <span class="hljs-keyword">finally</span> {
returnResource(jedis);
}
<span class="hljs-keyword">return</span> bytes;
}
<span class="hljs-javadoc">/**
* 接收消息。在main方法调用后,会一直执行下去。当有发布对应消息时,就会在jedisPubSub中接收到!
*
* 存在堵塞进程
*<span class="hljs-javadoctag"> @param</span> jedisPubSub
*<span class="hljs-javadoctag"> @param</span> channels
*/</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">subscribeMsg</span>(JedisPubSub jedisPubSub, String channels) {
Jedis jedis = <span class="hljs-keyword">null</span>;
<span class="hljs-keyword">try</span> {
jedis = pool.getResource();
jedis.subscribe(jedisPubSub, channels);
LOGGER.debug(<span class="hljs-string">"subscribeMsg {} = {}"</span>, jedisPubSub, channels);
} <span class="hljs-keyword">catch</span> (Exception e) {
LOGGER.error(<span class="hljs-string">"subscribeMsg {} = {}"</span>, jedisPubSub, channels, e);
} <span class="hljs-keyword">finally</span> {
returnResource(jedis);
}
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">publishMsg</span>(String channel, String message) {
Jedis jedis = <span class="hljs-keyword">null</span>;
<span class="hljs-keyword">try</span> {
jedis = pool.getResource();
jedis.publish(channel, message);
} <span class="hljs-keyword">catch</span> (Exception e) {
LOGGER.error(<span class="hljs-string">"publishMsg {} = {}"</span>, channel, message, e);
} <span class="hljs-keyword">finally</span> {
returnResource(jedis);
}
}
}
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