java Spring的许多缓存实现

Question

我需要在应用程序中使用几个memcached服务器

到目前为止，我只使用了一种配置：

<bean id="memcachedClient" class="net.spy.memcached.spring.MemcachedClientFactoryBean" scope="singleton">
    <property name="servers" value="${app.memcached.url}"/>
    <property name="protocol" value="BINARY"/>
    <property name="transcoder">
        <bean class="net.spy.memcached.transcoders.SerializingTranscoder">
            <property name="compressionThreshold" value="1024"/>
        </bean>
    </property>
    <property name="opTimeout" value="1000"/>
    <property name="timeoutExceptionThreshold" value="1998"/>
    <property name="locatorType" value="CONSISTENT"/>
    <property name="failureMode" value="Redistribute"/>
    <property name="useNagleAlgorithm" value="false"/>
</bean>

当我想使用两台服务器时，我只想添加：

<bean id="memcachedClient" class="net.spy.memcached.spring.MemcachedClientFactoryBean" scope="singleton">
    <property name="servers" value="${app.memcached.url}"/>
    <property name="protocol" value="BINARY"/>
    <property name="transcoder">
        <bean class="net.spy.memcached.transcoders.SerializingTranscoder">
            <property name="compressionThreshold" value="1024"/>
        </bean>
    </property>
    <property name="opTimeout" value="1000"/>
    <property name="timeoutExceptionThreshold" value="1998"/>
    <property name="locatorType" value="CONSISTENT"/>
    <property name="failureMode" value="Redistribute"/>
    <property name="useNagleAlgorithm" value="false"/>
</bean>

<bean id="memcachedAs" class="net.spy.memcached.spring.MemcachedClientFactoryBean" scope="singleton">
    <property name="servers" value="${app.memcached.url.as}"/>
    <property name="protocol" value="BINARY"/>
    <property name="transcoder">
        <bean class="net.spy.memcached.transcoders.SerializingTranscoder">
            <property name="compressionThreshold" value="1024"/>
        </bean>
    </property>
    <property name="opTimeout" value="1000"/>
    <property name="timeoutExceptionThreshold" value="1998"/>
    <property name="locatorType" value="CONSISTENT"/>
    <property name="failureMode" value="Redistribute"/>
    <property name="useNagleAlgorithm" value="false"/>
</bean>

但我得到了一个错误：

is org.springframework.beans.factory.NoSuchBeanDefinitionException: No unique bean of type [net.spy.memcached.MemcachedClient] is defined: expected single matching bean but found 

你能帮我实现很多配置吗

Answer 1

我假设你有一个注射目标

@Autowired
private MemcachedClient client;

Spring将尝试按bean的类型解析它。但是在你的上下文中有两个这种类型的bean，所以Spring不知道该选择哪一个。相反，您可以通过ID注入bean

@Resource(name="memcachedAs")
private MemcachedClient client;

甚至

@Autowired 
@Qualifier("memcachedAs")
private MemcachedClient client;