redis 订阅者发布者
2016-04-29 15:01
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下面的代码使用redis实现订阅/发布。需要jedis的2.0.0和SLF4J的jar包。
redis提供 一组命令实现订阅者发布者模式,publisher subscriber。实现进程间通信!
在redis中可以同时订阅多个频道,如果有消息发布是redis会发出通知。jedis中提供了JedisPubSub抽象类来提供发布/订阅的机制,在实际应用中需要实现JedisPubSub类。
订阅者
发布者
主程序
redis提供 一组命令实现订阅者发布者模式,publisher subscriber。实现进程间通信!
在redis中可以同时订阅多个频道,如果有消息发布是redis会发出通知。jedis中提供了JedisPubSub抽象类来提供发布/订阅的机制,在实际应用中需要实现JedisPubSub类。
订阅者
package cn.outofmemory.redis; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import redis.clients.jedis.JedisPubSub; public class Subscriber extends JedisPubSub { private static Logger logger = LoggerFactory.getLogger(Subscriber.class); @Override public void onMessage(String channel, String message) { logger.info("Message received. Channel: {}, Msg: {}", channel, message); } @Override public void onPMessage(String pattern, String channel, String message) { } @Override public void onSubscribe(String channel, int subscribedChannels) { } @Override public void onUnsubscribe(String channel, int subscribedChannels) { } @Override public void onPUnsubscribe(String pattern, int subscribedChannels) { } @Override public void onPSubscribe(String pattern, int subscribedChannels) { } }
发布者
package cn.outofmemory.redis; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import redis.clients.jedis.Jedis; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; public class Publisher { private static final Logger logger = LoggerFactory.getLogger(Publisher.class); private final Jedis publisherJedis; private final String channel; public Publisher(Jedis publisherJedis, String channel) { this.publisherJedis = publisherJedis; this.channel = channel; } public void start() { logger.info("Type your message (quit for terminate)"); try { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); while (true) { String line = reader.readLine(); if (!"quit".equals(line)) { publisherJedis.publish(channel, line); } else { break; } } } catch (IOException e) { logger.error("IO failure while reading input, e"); } } }
主程序
package cn.outofmemory.redis; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import redis.clients.jedis.Jedis; import redis.clients.jedis.JedisPool; import redis.clients.jedis.JedisPoolConfig; public class Program { public static final String CHANNEL_NAME = "commonChannel"; private static Logger logger = LoggerFactory.getLogger(Program.class); public static void main(String[] args) throws Exception { JedisPoolConfig poolConfig = new JedisPoolConfig(); JedisPool jedisPool = new JedisPool(poolConfig, "localhost", 6379, 0); final Jedis subscriberJedis = jedisPool.getResource(); final Subscriber subscriber = new Subscriber(); new Thread(new Runnable() { @Override public void run() { try { logger.info("Subscribing to \"commonChannel\". This thread will be blocked."); subscriberJedis.subscribe(subscriber, CHANNEL_NAME); logger.info("Subscription ended."); } catch (Exception e) { logger.error("Subscribing failed.", e); } } }).start(); Jedis publisherJedis = jedisPool.getResource(); new Publisher(publisherJedis, CHANNEL_NAME).start(); subscriber.unsubscribe(); jedisPool.returnResource(subscriberJedis); jedisPool.returnResource(publisherJedis); } }
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