无法从Guice DI app中的Spring Cache中逐出

时间:2013-04-06 19:04:16

标签: spring caching guice

我正在尝试使用带有guice模块的String Cache抽象机制。 我创造了拦截器:

CacheManager cacheManager = createCacheManager();         绑定(CacheManager.class).toInstance(CacheManager中);

    AppCacheInterceptor interceptor = new AppCacheInterceptor(
            cacheManager,
            createCacheOperationSource()
    );

    bindInterceptor(
            Matchers.any(),
            Matchers.annotatedWith(Cacheable.class),
            interceptor
    );

    bindInterceptor(
            Matchers.any(),
            Matchers.annotatedWith(CacheEvict.class),
            interceptor
    );

然后,实现了Strings Cache接口和CacheManager,最后使用@Cachable和@CacheEvict注释了我的DAO类:

public class DaoTester {

QssandraConsumer qs;

@CachePut(value = "cached_consumers", key = "#consumer.id")
public void save(QssandraConsumer consumer) {
    qs = consumer;
}

@Cacheable(value = "cached_consumers")
public QssandraConsumer get(String id) {
    if (id != null) {
        qs.getId();
    }
    return qs;
}

@CacheEvict(value = "cached_consumers", key = "#consumer.id")
public void remove(QssandraConsumer consumer) {
    qs = consumer;
}}

缓存很好 - 这里没有问题,但是当我试图逐出(在这个例子中调用remove方法)时,evrything崩溃了,我看到了:

  

线程“main”中的异常org.springframework.expression.spel.SpelEvaluationException:EL1007E:(pos 10):在null上找不到字段或属性“id”       在org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:205)       在org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:72)       在org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:57)       在org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:93)       在org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:88)       在org.springframework.cache.interceptor.ExpressionEvaluator.key(ExpressionEvaluator.java:80)       在org.springframework.cache.interceptor.CacheAspectSupport $ CacheOperationContext.generateKey(CacheAspectSupport.java:464)       在org.springframework.cache.interceptor.CacheAspectSupport.inspectCacheEvicts(CacheAspectSupport.java:260)       在org.springframework.cache.interceptor.CacheAspectSupport.inspectAfterCacheEvicts(CacheAspectSupport.java:232)       在org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:215)       在org.springframework.cache.interceptor.CacheInterceptor.invoke(CacheInterceptor.java:66)       在qiwi.qommon.deployment.dao.DaoTester.main(DaoTester.java:44)       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)       at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)       在java.lang.reflect.Method.invoke(Method.java:597)       在com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)

这里有什么问题?! BTW,缓存对象是:

public class QssandraConsumer implements Identifiable<String> {
private String id;
private String host;

@Override
public String getId() {
    return id;
}

@Override
public void setId(String id) {
    this.id = id;
}

public String getHost() {
    return host;
}

public void setHost(String host) {
    this.host = host;
}

@Override
public boolean equals(Object object) {
    if (this == object) {
        return true;
    }
    if (null == object) {
        return false;
    }


    if (!(object instanceof QssandraConsumer)) {
        return false;
    }

    QssandraConsumer o = (QssandraConsumer) object;

    return
        Objects.equal(id, o.id)
            && Objects.equal(host, o.host);
}

@Override
public int hashCode() {
    return Objects.hashCode(
        id, host
    );
}

@Override
public String toString() {
    return Objects.toStringHelper(this)
        .addValue(id)
        .addValue(host)
        .toString();
}

}

1 个答案:

答案 0 :(得分:0)

最后我弄清楚问题的原因是什么: 当注入一个使用注释的类(被拦截,如@Cachable@CacheEvict)时,Guice增强了类(AOP在运行时进行字节码修改)。因此,CacheInterceptor尝试评估key = "#consumer.id"时失败,因为无法在增强类中找到参数名称(请参阅:LocalVariableTableParameterNameDiscoverer#inspectClass)。 所以它在开箱即用的Guice中不起作用。 在春天,代理类被创建 - 所以这里没有问题。