Question

在spring documentation about cache之后，我可以在项目中使用缓存，但是如何配置guava来定义每个缓存名称的过期时间或大小？

applicationConfig.xml

<bean id="cacheManager" class="org.springframework.cache.guava.GuavaCacheManager"/>

Foo.java

@Cacheable(value="courses", key="#user.id")
public List<Course> getCoursesByUser(User user) {
    ...
}

Answer 1

您可以单独配置缓存。见Spring Guava cache

@Bean
public CacheManager cacheManager() {
    SimpleCacheManager simpleCacheManager = new SimpleCacheManager();
    GuavaCache bookCache = new GuavaCache("book", CacheBuilder.newBuilder().build());
    GuavaCache booksExpirableCache = new GuavaCache("books", CacheBuilder.newBuilder()
            .expireAfterAccess(30, TimeUnit.MINUTES)
            .build());
    simpleCacheManager.setCaches(Arrays.asList(bookCache, booksExpirableCache));
    return simpleCacheManager;
}

Answer 2

您可以在Spring配置中为GuavaCacheManager指定CacheBuilder

如果是Java配置，它可能如下所示：

@Bean
public CacheManager cacheManager() {
    GuavaCacheManager cacheManager = new GuavaCacheManager();
    cacheManager.setCacheBuilder(
        CacheBuilder.
        newBuilder().
        expireAfterWrite(2, TimeUnit.SECONDS).
        maximumSize(100));
    return cacheManager;
}

如果是XML配置，您可以在guava中使用CacheBuilderSpec

<bean id="legendaryCacheBuilder"
      class="com.google.common.cache.CacheBuilder"
      factory-method="from">
    <constructor-arg value="maximumSize=42,expireAfterAccess=10m,expireAfterWrite=1h" />
</bean>

有关详细信息，请参阅：

http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/cache/CacheBuilderSpec.html

Injecting Google guava cache builder into bean via Spring

Answer 3

另一种方式

XML

   <bean id="cacheManager" class="org.springframework.cache.guava.GuavaCacheManager">
        <property name="cacheBuilderSpec">
            <bean class="com.google.common.cache.CacheBuilderSpec" factory-method="parse">
                <constructor-arg name="cacheBuilderSpecification" value="expireAfterWrite=55m"/>
            </bean>
        </property>
    </bean>

爪哇

@Cacheable(value = "tokenValue", cacheManager = "cacheManager")

Answer 4

我认为@mavarazy答案是最好的。我只是添加，如果您需要自己的自动丢失缓存配置，您可以通过以下方式进行。

首先定义您自己的缓存管理器，如果需要，它会自动创建缓存：

public class MyCacheManager extends SimpleCacheManager {

    @Override
    protected Cache getMissingCache(String name) {
        // or different cache config if you need
        return new GuavaCache(name, CacheBuilder.newBuilder().maximumSize(250).expireAfterWrite(10, TimeUnit.MINUTES).build());
    }
}

现在您可以定义缓存管理器配置：

@Bean
public CacheManager cacheManager() {
    SimpleCacheManager simpleCacheManager = new MyCacheManager();
    GuavaCache specificCacheConfig = new GuavaCache("specificCacheConfigName",
        CacheBuilder.newBuilder().expireAfterAccess(60, TimeUnit.MINUTES).build());
    simpleCacheManager.setCaches(Collections.singletonList(specificCacheConfig));
    return simpleCacheManager;
}

Answer 5

通过扩展 'CachingConfigurerSupport' 类，您可以提供自定义缓存定义。

例如

@Configuration
@EnableCaching
public class CacheConfig extends CachingConfigurerSupport {
    @Bean
    @Override
    public CacheManager cacheManager() {
    
        SimpleCacheManager cacheManager = new SimpleCacheManager();
        GuavaCache myOrgCache = new GuavaCache("myOrgCache", CacheBuilder.newBuilder().build());
        GuavaCache myEmployeeCache = new GuavaCache("myEmployeeCache",
                CacheBuilder.newBuilder().expireAfterWrite(10, TimeUnit.SECONDS).build());
        cacheManager.setCaches(Arrays.asList(myOrgCache, myEmployeeCache));
        return cacheManager;
    }

    @Override
    public KeyGenerator keyGenerator() {
        return new CacheKeyGenerator();
    }
}

参考link。

使用Guava配置Spring缓存

5 个答案: