Question

我有以下方法：

@Scheduled(fixedRate = 20000)
@Async
public void test() {

Operator operator = this.operatorRepository.findOne(1L);
System.out.println(operator.getName());

org.springframework.cache.ehcache.EhCacheCache c = (EhCacheCache) cacheManager.getCache("example");
System.out.println("HIT: "+c.getNativeCache().getStatistics().getExtended().get().component(GetOutcome.HIT).count().value());
System.out.println("MISS_EXPIRED: "+c.getNativeCache().getStatistics().getExtended().get().component(GetOutcome.MISS_EXPIRED).count().value());
System.out.println("MISS_NOT_FOUND: "+c.getNativeCache().getStatistics().getExtended().get().component(GetOutcome.MISS_NOT_FOUND).count().value());

System.out.println(c.getNativeCache().getStatistics().cacheHitOperation().count().value());
System.out.println("MISS COUNT: " +c.getNativeCache().getStatistics().cacheMissCount());
System.out.println("HIT COUNT: " +c.getNativeCache().getStatistics().cacheHitCount());
System.out.println("MISS_EXPIRED COUNT: " +c.getNativeCache().getStatistics().cacheMissExpiredCount());
System.out.println("CACHE_SIZE: " + c.getNativeCache().getStatistics().getSize());

}

输出结果为：

HIT: 0
MISS_EXPIRED: 0
MISS_NOT_FOUND: 0
0
MISS COUNT: 0
HIT COUNT: 0
MISS_EXPIRED COUNT: 0
CACHE_SIZE: 0

正如您所看到的，我正在为我的数据库操作使用jpa存储库（spring-data）。我配置了二级缓存。然而没有命中\未命中。我的Operator实体注释如下：

@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)

这是我的xml配置：

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver" />

    <property name="url" value="${mysql_url}" />
    <property name="username" value="xxx" />
    <property name="password" value="xxx" />

    <property name="initialSize" value="10" />
    <property name="maxActive" value="100" />
    <property name="maxIdle" value="15" />
    <property name="minIdle" value="10" />
    <property name="timeBetweenEvictionRunsMillis" value="10000" />
    <property name="minEvictableIdleTimeMillis" value="60000" />

    <property name="validationQuery" value="/* ping */ SELECT 1" />
    <property name="testOnBorrow" value="true" />
    <property name="testWhileIdle" value="true" />

    <property name="removeAbandoned" value="true" />
    <property name="removeAbandonedTimeout" value="300" />
</bean>

<bean id="entityManagerFactory"
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">

    <property name="packagesToScan"
        value="com.xxx.model, com.xxx.shared.model" />
    <property name="dataSource" ref="dataSource" />

    <property name="jpaProperties">
        <props>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
            <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
            <prop key="hibernate.cache.use_second_level_cache">true</prop>
            <prop key="hibernate.cache.use_query_cache">true</prop>
            <prop key="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</prop>
            <prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory</prop>
            <prop key="hibernate.generate_statistics">true</prop>
        </props>
    </property>
    <property name="jpaDialect">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect" />
    </property>
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
            <property name="database" value="MYSQL" />
            <property name="showSql" value="false" />
            <property name="generateDdl" value="false" />
        </bean>
    </property>
    <property name="jpaPropertyMap">
        <map>
            <entry key="hibernate.connection.autocommit" value="false" />
        </map>
    </property>

</bean>

和我的缓存xml：

<ehcache   name="test"> 
<cache name="example" maxElementsInMemory="1000" eternal="false"  statistics="true" 
    overflowToDisk="false" timeToIdleSeconds="0" timeToLiveSeconds="600">
    <cacheEventListenerFactory
        class="net.sf.ehcache.distribution.RMICacheReplicatorFactory"
        properties="replicateAsynchronously=false,replicatePuts=false
         ,replicateUpdates=true,replicateUpdatesViaCopy=false
         ,replicateRemovals=true"
        propertySeparator="," />
    <bootstrapCacheLoaderFactory
        class="net.sf.ehcache.distribution.RMIBootstrapCacheLoaderFactory"
        properties="bootstrapAsynchronously=true, maximumChunkSizeBytes=5000000" />
</cache>

<cacheManagerPeerProviderFactory
    class="net.sf.ehcache.distribution.RMICacheManagerPeerProviderFactory"
    properties="peerDiscovery=automatic, multicastGroupAddress=230.0.0.1,
                multicastGroupPort=4446, timeToLive=32" />
<cacheManagerPeerListenerFactory
    class="net.sf.ehcache.distribution.RMICacheManagerPeerListenerFactory"
    properties="hostName=localhost, port=40001, socketTimeoutMillis=2000" />
</ehcache>

任何想法为什么？

Answer 1

使用@Cache注释时，默认情况下，实体会缓存在一个区域（缓存）中，该区域的名称等于实体的完全限定类名。

如果您希望在Operator缓存中缓存example个实体，则应向region添加@Cache，例如以下示例：

@Cache(usage=CacheConcurrencyStrategy.READ_WRITE, region="example")
@Entity
class Operator {
    ...
}

此外 - 如果缓存正常工作 - 您应该两次调用this.operatorRepository.findOne(1L);以查看任何缓存命中。

EhCache - 不使用spring数据进行缓存

1 个答案: