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Spring @Cacheable redis出現(xiàn)異常如何解決?很多新手對(duì)此不是很清楚,為了幫助大家解決這個(gè)難題,下面小編將為大家詳細(xì)講解,有這方面需求的人可以來(lái)學(xué)習(xí)下,希望你能有所收獲。
我們是通過(guò)@EnableCaching進(jìn)行緩存啟用的,因此可以先看@EnableCaching的相關(guān)注釋
通過(guò)@EnableCaching的類(lèi)注釋可發(fā)現(xiàn),spring cache的核心配置接口為:org.springframework.cache.annotation.CachingConfigurer
/** * 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(); }
該接口errorHandler方法可配置異常的處理方式。通過(guò)該方法上的注釋可以發(fā)現(xiàn),默認(rèn)的CacheErrorHandler實(shí)現(xiàn)類(lèi)是org.springframework.cache.interceptor.SimpleCacheErrorHandler
/** * 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類(lèi)注釋上說(shuō)明的很清楚:對(duì)cache的異常不做任何處理,直接將該異常拋給客戶(hù)端。因此默認(rèn)的情況下,redis服務(wù)器異常后,直接就阻斷了正常業(yè)務(wù)
通過(guò)上面的分析可知,我們可以通過(guò)自定義CacheErrorHandler來(lái)干預(yù)@Cacheable的異常處理邏輯。具體代碼如下:
public class RedisConfig extends CachingConfigurerSupport { /** * redis數(shù)據(jù)操作異常處理。該方法處理邏輯:在日志中打印出錯(cuò)誤信息,但是放行。 * 保證redis服務(wù)器出現(xiàn)連接等問(wèn)題的時(shí)候不影響程序的正常運(yùn)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異常:key=[{}]", key, exception); } }
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