springsession源码分析三之RedisOperationsSessionRepository

RedisOperationsSessionRepository

1. uml 图
   

   MessageListener是redis消息订阅的监听接口，SessionMessageListener 是过时的，已经被
   RedisOperationsSessionRepository所代替，可以从源码中看到

2. 源码分析

   public class RedisOperationsSessionRepository implements
           FindByIndexNameSessionRepository<RedisOperationsSessionRepository.RedisSession>,
           MessageListener {
       private static final Log logger = LogFactory
               .getLog(RedisOperationsSessionRepository.class);
   
       private static final String SPRING_SECURITY_CONTEXT = "SPRING_SECURITY_CONTEXT";
   
       static PrincipalNameResolver PRINCIPAL_NAME_RESOLVER = new PrincipalNameResolver();
   
       /**
        * The default prefix for each key and channel in Redis used by Spring Session.
        * 默认key和channel的前缀
        */
       static final String DEFAULT_SPRING_SESSION_REDIS_PREFIX = "spring:session:";
   
       /**
        * The key in the Hash representing
        * {@link org.springframework.session.ExpiringSession#getCreationTime()}.
        */
       static final String CREATION_TIME_ATTR = "creationTime";
   
       /**
        * The key in the Hash representing
        * {@link org.springframework.session.ExpiringSession#getMaxInactiveIntervalInSeconds()}
        * .
        */
       static final String MAX_INACTIVE_ATTR = "maxInactiveInterval";
   
       /**
        * The key in the Hash representing
        * {@link org.springframework.session.ExpiringSession#getLastAccessedTime()}.
        */
       static final String LAST_ACCESSED_ATTR = "lastAccessedTime";
   
       /**
        * The prefix of the key for used for session attributes. The suffix is the name of
        * the session attribute. For example, if the session contained an attribute named
        * attributeName, then there would be an entry in the hash named
        * sessionAttr:attributeName that mapped to its value.
        * session属性sessionAttr:attributeName
        */
       static final String SESSION_ATTR_PREFIX = "sessionAttr:";
   
       /**
        * The prefix for every key used by Spring Session in Redis.
        */
       private String keyPrefix = DEFAULT_SPRING_SESSION_REDIS_PREFIX;
       //从uml图中可以看出这是redis模板操作的接口
       private final RedisOperations sessionRedisOperations;
       /**
       redis session过期策略处理类。RedisSessionExpirationPolicy与RedisOperationsSessionRepository相互引用，    RedisOperationsSessionRepository去通知RedisSessionExpirationPolicy做相关的操作，同时RedisSessionExpirationPolicy从RedisOperationsSessionRepository拉取相关的信息。特别像观察者模式中的“拉操作”，可以认为是简版的观察者模式
       **/
       private final RedisSessionExpirationPolicy expirationPolicy;
       /**
       * 事件发布
       **/
       private ApplicationEventPublisher eventPublisher = new ApplicationEventPublisher() {
           public void publishEvent(ApplicationEvent event) {
           }
   
           public void publishEvent(Object event) {
           }
       };
   
       /**
        * If non-null, this value is used to override the default value for
        * {@link RedisSession#setMaxInactiveIntervalInSeconds(int)}.
        */
       private Integer defaultMaxInactiveInterval;
       //默认redis序列化使用的jdk序列化方式
       private RedisSerializer