文算是Redis哨兵的一個入門文章，主要講了哨兵的作用，例如監控、選主和通知。
在Redis讀寫分離的情況下，使用哨兵可以很輕松地做到故障恢復，提升了整體的可用性。
但哨兵無法解決Redis單機寫的瓶頸，這就需要引入集群模式，相應的文章也被列為明年的寫作計劃中。
</article>
/
*** Redis 相關的配置，包含推送，以及對象編碼的定義
*/
@Configuration
public class RedisConfig {
public @Bean
RedisTemplate redisTemplate(RedisConnectionFactory 買粉絲nnectionFactory) {
RedisTemplate template = new RedisTemplate>();
template.setConnectionFactory(買粉絲nnectionFactory);
template.setDefaultSerializer(new GenericJackson2JsonRedisSerializer());
template.setKeySerializer(new StringRedisSerializer());
template.setHashKeySerializer(new GenericJackson2JsonRedisSerializer());
template.setValueSerializer(new GenericJackson2JsonRedisSerializer());
return template;
}
@Bean
ChannelTopic topic() {
return new ChannelTopic("messageQueue");
}
@Bean
RedisMessageListenerContainer 買粉絲ntainer(RedisConnectionFactory 買粉絲nnectionFactory,
MessageListenerAdapter listenerAdapter) {
RedisMessageListenerContainer 買粉絲ntainer = new RedisMessageListenerContainer();
買粉絲ntainer.setConnectionFactory(買粉絲nnectionFactory);
買粉絲ntainer.addMessageListener(listenerAdapter, new PatternTopic("messageQueue"));
return 買粉絲ntainer;
}
@Bean
MessageListenerAdapter listenerAdapter(Receiver receiver) {
return new MessageListenerAdapter(receiver, "receiveMessage");
}
}
public enum BusinessTypeEnum {
//修改SystemConfig緩存
UPDATE_SYSTEM_CONFIG;
}
//發布者接口
public interface MessagePublisher {
void publish(String message);
}
@Component
public class RedisMessagePublisher implements MessagePublisher{
private final static Logger logger = LoggerFactory.getLogger(RedisMessagePublisher.class);
@Autowired
private RedisTemplate redisTemplate;
@Autowired
private ChannelTopic topic;
@Override
public void publish(String message) {
logger.info("推送信息："+message);
redisTemplate.買粉絲nvertAndSend(topic.getTopic(), message);
}
}
public interface Receiver { void receiveMessage(String message); }
@Component
public class MessageReceiver implements Receiver {
private final static Logger logger = LoggerFactory.getLogger(MessageReceiver.class);
@Autowired
private ISystemConfigService systemConfigService;
@Override
public void receiveMessage(String message) {
logger.info("消息接收："+message);
JSONObject object = JSONObject.parseObject(message);
String businessType = object.getString("businessType");
logger.info("處理業務類型：businessType="+businessType);
if(BusinessTypeEnum.UPDATE_SYSTEM_CONFIG.toString().equals(businessType)){ //處理SystemConfig緩存
String jsonStr = object.getString("jsonStr");
if(jsonStr!=null&&!"".equals(jsonStr)){
JSONObject json = JSONObject.parseObject(object.getString("jsonStr"));
for(String key:json.keySet()){
String value = json.getString(key);
SystemConfig systemConfig = SystemConfigContainer.instance().getSystemConfig(key);
if(systemConfig!=null){
systemConfig.setKeyValue(value);
SystemConfigContainer.instance().uptSystemConfig(systemConfig);
}else{
systemConfig = systemConfigService.selectByPrimaryJianMing(key);
systemConfig.setKeyValue(value);
SystemConfigContainer.instance().uptSystemConfig(systemConfig);
}
}
}
}
}
}