我想在为 findById(Long id) 方法扩展相同 AbstractService 的多个服务上启用缓存。
所以在我的 applicationContext 我写道:
<!-- cache definitions -->
<cache:advice id="cacheAdvice" cache-manager="cacheManager">
<cache:caching cache="refs">
<cache:cacheable method="findById" key="#root.targetClass + #id"/>
</cache:caching>
</cache:advice>
<aop:config>
<aop:advisor advice-ref="cacheAdvice" pointcut="execution(* x.y.*.service.reference.*.*(..))"/>
</aop:config>
问题是我想为方法 findById 上的每个服务调用生成一个唯一键,因为 ID 可以相同(因此有一个类转换异常):
java.lang.ClassCastException: x.y.model.RefSituation cannot be cast to x.y.model.RefCivility
单元测试 :
public class AbstractReferenceServiceTest extends AbstractBiTest {
@Inject
@Named("refSituationServiceClient")
private RefSituationService refSituationService;
@Inject
@Named("refCivilityServiceClient")
private RefCivilityService refCivilityService;
@Test
public void findById() {
RefSituation situation = refSituationService.findById(1L);
situation = refSituationService.findById(2L);
situation = refSituationService.findById(1L);
RefCivility refCivility = refCivilityService.findById(1L);
refCivility = refCivilityService.findById(2L);
refCivility = refCivilityService.findById(1L);
}
}
两种服务都扩展了 AbstractReferenceService :
public interface RefSituationService extends AbstractReferenceService<RefSituation> {}
public interface RefCivilityService extends AbstractReferenceService<RefCivility> {}
并且 AbstractReferenceService 扩展了一个名为 RestHub 的框架提供的 crudService ( https://github.com/resthub/resthub-spring-stack/blob/master/resthub-common/src/main/java/org/resthub/common/service/ CrudService.java )
但是使用上面的配置我有一个错误:
org.springframework.expression.spel.SpelEvaluationException: EL1030E:(pos 0): The operator 'ADD' is not supported between objects of type 'java.lang.Class' and 'null'
at org.springframework.expression.spel.ExpressionState.operate(ExpressionState.java:198)
at org.springframework.expression.spel.ast.OpPlus.getValueInternal(OpPlus.java:97)
at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:93)
at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:89)
at org.springframework.cache.interceptor.ExpressionEvaluator.key(ExpressionEvaluator.java:80)
at org.springframework.cache.interceptor.CacheAspectSupport$CacheOperationContext.generateKey(CacheAspectSupport.java:464)
at org.springframework.cache.interceptor.CacheAspectSupport.inspectCacheables(CacheAspectSupport.java:291)
at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:198)
at org.springframework.cache.interceptor.CacheInterceptor.invoke(CacheInterceptor.java:66)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:91)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at com.sun.proxy.$Proxy175.findById(Unknown Source)
在此先感谢您的帮助。