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Spring @Cacheable redis异常不影响正常业务方案

转载 作者：qq735679552 更新时间：2022-09-29 22:32:09 31 4
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背景

项目中,使用@Cacheable进行数据缓存。发现：当redis宕机之后，@Cacheable注解的方法并未进行缓存冲突，而是直接抛出异常。而这样的异常会导致服务不可用.

原因分析

我们是通过@EnableCaching进行缓存启用的，因此可以先看@EnableCaching的相关注释 。

Spring @Cacheable redis异常不影响正常业务方案

通过@EnableCaching的类注释可发现,spring cache的核心配置接口为：org.springframework.cache.annotation.CachingConfigurer 。

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/**
  * Interface to be implemented by @{@link org.springframework.context.annotation.Configuration
  * Configuration} classes annotated with @{@link EnableCaching} that wish or need to
  * specify explicitly how caches are resolved and how keys are generated for annotation-driven
  * cache management. Consider extending {@link CachingConfigurerSupport}, which provides a
  * stub implementation of all interface methods.
  *
  * <p>See @{@link EnableCaching} for general examples and context; see
  * {@link #cacheManager()}, {@link #cacheResolver()} and {@link #keyGenerator()}
  * for detailed instructions.
  *
  * @author Chris Beams
  * @author Stephane Nicoll
  * @since 3.1
  * @see EnableCaching
  * @see CachingConfigurerSupport
  */
public interface CachingConfigurer {
 
  /**
  * Return the cache manager bean to use for annotation-driven cache
  * management. A default {@link CacheResolver} will be initialized
  * behind the scenes with this cache manager. For more fine-grained
  * management of the cache resolution, consider setting the
  * {@link CacheResolver} directly.
  * <p>Implementations must explicitly declare
  * {@link org.springframework.context.annotation.Bean @Bean}, e.g.
  * <pre class="code">
  * Configuration
  * EnableCaching
  * public class AppConfig extends CachingConfigurerSupport {
  *  Bean // important!
  *  Override
  *  public CacheManager cacheManager() {
  *   // configure and return CacheManager instance
  *  }
  *  // ...
  * }
  * </pre>
  * See @{@link EnableCaching} for more complete examples.
  */
  CacheManager cacheManager();
 
  /**
  * Return the {@link CacheResolver} bean to use to resolve regular caches for
  * annotation-driven cache management. This is an alternative and more powerful
  * option of specifying the {@link CacheManager} to use.
  * <p>If both a {@link #cacheManager()} and {@code #cacheResolver()} are set,
  * the cache manager is ignored.
  * <p>Implementations must explicitly declare
  * {@link org.springframework.context.annotation.Bean @Bean}, e.g.
  * <pre class="code">
  * Configuration
  * EnableCaching
  * public class AppConfig extends CachingConfigurerSupport {
  *  Bean // important!
  *  Override
  *  public CacheResolver cacheResolver() {
  *   // configure and return CacheResolver instance
  *  }
  *  // ...
  * }
  * </pre>
  * See {@link EnableCaching} for more complete examples.
  */
  CacheResolver cacheResolver();
 
  /**
  * Return the key generator bean to use for annotation-driven cache management.
  * Implementations must explicitly declare
  * {@link org.springframework.context.annotation.Bean @Bean}, e.g.
  * <pre class="code">
  * Configuration
  * EnableCaching
  * public class AppConfig extends CachingConfigurerSupport {
  *  Bean // important!
  *  Override
  *  public KeyGenerator keyGenerator() {
  *   // configure and return KeyGenerator instance
  *  }
  *  // ...
  * }
  * </pre>
  * See @{@link EnableCaching} for more complete examples.
  */
  KeyGenerator keyGenerator();
 
  /**
  * Return the {@link CacheErrorHandler} to use to handle cache-related errors.
  * <p>By default,{@link org.springframework.cache.interceptor.SimpleCacheErrorHandler}
  * is used and simply throws the exception back at the client.
  * <p>Implementations must explicitly declare
  * {@link org.springframework.context.annotation.Bean @Bean}, e.g.
  * <pre class="code">
  * Configuration
  * EnableCaching
  * public class AppConfig extends CachingConfigurerSupport {
  *  Bean // important!
  *  Override
  *  public CacheErrorHandler errorHandler() {
  *   // configure and return CacheErrorHandler instance
  *  }
  *  // ...
  * }
  * </pre>
  * See @{@link EnableCaching} for more complete examples.
  */
  CacheErrorHandler errorHandler();
 
}

该接口errorHandler方法可配置异常的处理方式。通过该方法上的注释可以发现,默认的CacheErrorHandler实现类是org.springframework.cache.interceptor.SimpleCacheErrorHandler 。

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/**
  * A simple {@link CacheErrorHandler} that does not handle the
  * exception at all, simply throwing it back at the client.
  *
  * @author Stephane Nicoll
  * @since 4.1
  */
public class SimpleCacheErrorHandler implements CacheErrorHandler {
 
  @Override
  public void handleCacheGetError(RuntimeException exception, Cache cache, Object key) {
  throw exception;
  }
 
  @Override
  public void handleCachePutError(RuntimeException exception, Cache cache, Object key, Object value) {
  throw exception;
  }
 
  @Override
  public void handleCacheEvictError(RuntimeException exception, Cache cache, Object key) {
  throw exception;
  }
 
  @Override
  public void handleCacheClearError(RuntimeException exception, Cache cache) {
  throw exception;
  }
}

SimpleCacheErrorHandler类注释上说明的很清楚：对cache的异常不做任何处理，直接将该异常抛给客户端。因此默认的情况下，redis服务器异常后，直接就阻断了正常业务 。

解决方案

通过上面的分析可知，我们可以通过自定义CacheErrorHandler来干预@Cacheable的异常处理逻辑。具体代码如下:

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public class RedisConfig extends CachingConfigurerSupport {
 
   /**
    * redis数据操作异常处理。该方法处理逻辑：在日志中打印出错误信息，但是放行。
    * 保证redis服务器出现连接等问题的时候不影响程序的正常运行
    */
   @Override
   public CacheErrorHandler errorHandler() {
     return new CacheErrorHandler() {
       @Override
       public void handleCachePutError(RuntimeException exception, Cache cache,
                       Object key, Object value) {
         handleRedisErrorException(exception, key);
       }
 
       @Override
       public void handleCacheGetError(RuntimeException exception, Cache cache,
                       Object key) {
         handleRedisErrorException(exception, key);
       }
 
       @Override
       public void handleCacheEvictError(RuntimeException exception, Cache cache,
                        Object key) {
         handleRedisErrorException(exception, key);
       }
 
       @Override
       public void handleCacheClearError(RuntimeException exception, Cache cache) {
         handleRedisErrorException(exception, null );
       }
     };
   }
 
   protected void handleRedisErrorException(RuntimeException exception, Object key) {
     log.error( "redis异常：key=[{}]" , key, exception);
   }
}

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原文链接：https://juejin.cn/post/6930545205036875784 。

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