Question

Has anyone tried invalidating a memcached namespace based on timestamp? For e.g. I need to have a memcached namespace which is the timestamp of the tomcat server that hosts my API services. I need to annotate my method calls so that the namespace is a variable (rather than a constant) and it holds a timestamp of the server startup.

@ReadThroughAssignCache(namespace = "api_divisions_", assignedKey="allDivisions")
public List<Division> getAllDivisions()
{
    List<Division> all = (List<Division>)getHibernateTemplate().find("from Division");
    return all;
}

然后每次服务器启动时, 此方法上的命名空间需要动态设置为服务器启动时间。

- 我知道最新消息,有环绕的方式这样做使用java助理和动态说明, 但我想要一个更好的方法。

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Answer 1

The namespace is always a constant, you cannot use variable. As I understand you want to create cache key using server startup time. There are at least two way how it can be done. First: use @ReadThroughSingleCache

@ReadThroughSingleCache(namespace = "api_divisions_allDivisions")
public List<Division> getAllDivisions(@ParameterValueKeyProvider long startup)
{
  List<Division> all = (List<Division>)getHibernateTemplate().find("from Division");
  return all;
}

第二:使用自定义 < a href=>" "https://sople-spring-memcached.googlecode.com/svn/docs/2.0.0/apidocs/com/google/code/ssm/aop/support/CacheKeyBuilder.html" rel="nofollow" >CacheKeyBuilder ,可以给每个缓存键添加时间戳。

您是否需要在服务器启动前存储旧的值? 如果不是, 简单的解决方案就是总是使用相同的缓存密钥, 并在服务器启动时清除杂交。

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