标签：spring-data-redis jedis java spring redis

以下是我的jedis配置

@Bean
public JedisConnectionFactory getJedisConnectionFactory() {
    JedisConnectionFactory jedisConnectionFactory = new JedisConnectionFactory();
    jedisConnectionFactory.setUsePool(true);
    return jedisConnectionFactory;
}

@Bean
public RedisTemplate<String, Object> getRedisTemplate() {
    RedisTemplate<String, Object> redisTemplate = new RedisTemplate<String, Object>();
    redisTemplate.setConnectionFactory(getJedisConnectionFactory());
    return redisTemplate;
}

当我有单个服务器时,此配置很有效.我想要做的是拥有1个redis master和多个redis slave.根据redis文档,读取应该从slave发生,写入应该从master发生.如何更改上述配置以使用master进行写入和slave进行读取？

可以说我的主人在192.168.10.10,奴隶在localhost.

谢谢！

解决方法:

目前,Spring Data Redis中没有可以实现所需行为的配置选项. Jedis也没有为这种情况提供支持(见jedis #458).
RedisConnection在执行操作时请求来自工厂的连接.此时,请求它的资源的使用目的不明确,因为命令可能是r,w或rw.

一个可能的解决方案是自定义RedisConnectionFactory,它能够提供连接 – 在您执行只读命令的情况下为您拥有的一个从属设备.

SlaveAwareJedisConnectionFactory factory = new SlaveAwareJedisConnectionFactory();
factory.afterPropertiesSet();

RedisConnection connection = factory.getConnection();

// writes to master
connection.set("foo".getBytes(), "bar".getBytes());

// reads from slave
connection.get("foo".getBytes());

/**
 * SlaveAwareJedisConnectionFactory wraps JedisConnection with a proy that delegates readonly commands to slaves.
 */
class SlaveAwareJedisConnectionFactory extends JedisConnectionFactory {

  /**
    * Get a proxied connection to Redis capable of sending
    * readonly commands to a slave node
    */
  public JedisConnection getConnection() {

    JedisConnection c = super.getConnection();

    ProxyFactory proxyFactory = new ProxyFactory(c);
    proxyFactory.addAdvice(new ConnectionSplittingInterceptor(this));
    proxyFactory.setProxyTargetClass(true);

    return JedisConnection.class.cast(proxyFactory.getProxy());
  };

  /**
   * This one will get the connection to one of the slaves to read from there
   * 
   * @return
   */
  public RedisConnection getSlaveConnection() {

    //TODO: find the an available slave serving the data
    return new JedisConnection(new Jedis("your slave host lookup here"));
  }

  static class ConnectionSplittingInterceptor implements MethodInterceptor,
      org.springframework.cglib.proxy.MethodInterceptor {

    private final SlaveAwareJedisConnectionFactory factory;

    public ConnectionSplittingInterceptor(SlaveAwareJedisConnectionFactory factory) {
      this.factory = factory;
    }

    @Override
    public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {

      RedisCommand commandToExecute = RedisCommand.failsafeCommandLookup(method.getName());

      if (!commandToExecute.isReadonly()) {
        return invoke(method, obj, args);
      }

      RedisConnection connection = factory.getSlaveConnection();

      try {
        return invoke(method, connection, args);
      } finally {
        // properly close the connection after executing command
        if (!connection.isClosed()) {
          connection.close();
        }
      }
    }

    private Object invoke(Method method, Object target, Object[] args) throws Throwable {

      try {
        return method.invoke(target, args);
      } catch (InvocationTargetException e) {
        throw e.getCause();
      }
    }

    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
      return intercept(invocation.getThis(), invocation.getMethod(), invocation.getArguments(), null);
    }
  }
}

上面的解决方案存在几个问题.例如.您的应用程序中的多个EXEC块可能不再按预期工作,因为现在命令可能会在您不希望它们的某个地方发送.因此,将多个RedisTemplate用于专用读写目的也许是有意义的.

标签：spring-data-redis,jedis,java,spring,redis
来源： https://codeday.me/bug/20190728/1559147.html

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