springsession源码分析二之RedisHttpSessionConfiguration

SpringHttpSessionConfiguration

1. SpringHttpSessionConfiguration是RedisHttpSessionConfiguration的父类

2. 代码

   @Configuration
   public class SpringHttpSessionConfiguration {
   
       private CookieHttpSessionStrategy defaultHttpSessionStrategy = new CookieHttpSessionStrategy();
   
       private HttpSessionStrategy httpSessionStrategy = this.defaultHttpSessionStrategy;
   
       private List httpSessionListeners = new ArrayList();
   
       private ServletContext servletContext;
   
       @Bean
       public SessionEventHttpSessionListenerAdapter sessionEventHttpSessionListenerAdapter() {
           return new SessionEventHttpSessionListenerAdapter(this.httpSessionListeners);
       }
       /***
       SessionRepositoryFilter的Bean是在这里被注入的
       **/
       @Bean
       public  SessionRepositoryFilter springSessionRepositoryFilter(
               SessionRepository sessionRepository) {
           SessionRepositoryFilter sessionRepositoryFilter = new SessionRepositoryFilter(
                   sessionRepository);
           sessionRepositoryFilter.setServletContext(this.servletContext);
           if (this.httpSessionStrategy instanceof MultiHttpSessionStrategy) {
               sessionRepositoryFilter.setHttpSessionStrategy(
                       (MultiHttpSessionStrategy) this.httpSessionStrategy);
           }
           else {
               sessionRepositoryFilter.setHttpSessionStrategy(this.httpSessionStrategy);
           }
           return sessionRepositoryFilter;
       }
   
       @Autowired(required = false)
       public void setServletContext(ServletContext servletContext) {
           this.servletContext = servletContext;
       }
   
       @Autowired(required = false)
       public void setCookieSerializer(CookieSerializer cookieSerializer) {
           this.defaultHttpSessionStrategy.setCookieSerializer(cookieSerializer);
       }
   
       @Autowired(required = false)
       public void setHttpSessionStrategy(HttpSessionStrategy httpSessionStrategy) {
           this.httpSessionStrategy = httpSessionStrategy;
       }
   
       @Autowired(required = false)
       public void setHttpSessionListeners(List listeners) {
           this.httpSessionListeners = listeners;
       }
   }

RedisHttpSessionConfiguration

1. 代码

           /**
           0.RedisHttpSessionConfiguration 是一个编程式注解
           1. @Configuration相当于xml中的标签，使用AnnotationConfigApplicationContext读取配置
           而xml使用ClassPathXmlApplicationContext读取
           2. @EnableScheduling使用该注解让Spring可以进行任务调度，功能类似于Spring的xml命名空间
           */
           @Configuration
           @EnableScheduling
           public class RedisHttpSessionConfiguration extends SpringHttpSessionConfiguration
                   implements ImportAware {
               //redis键的超时时间，即session,key的超时时间 
               private Integer maxInactiveIntervalInSeconds = 1800;
               /***
               *在Redis 2.8.0版本起，加入了“Keyspace notifications”（即“键空间通知”）的功能
               键空间通知，允许Redis客户端从“发布/订阅”通道中建立订阅关系，以便客户端能够在Redis中的数据因某种方式受到影响时收到相应事件
               在官方文档中，keyevent通道的格式永远是这样的：
           __keyevent@__:prefix
           对于数据过期事件，我们在绑定订阅时通配模板也可以精确地写成：
           __keyevent@*__:expired
               **/
               private ConfigureRedisAction configureRedisAction = new ConfigureNotifyKeyspaceEventsAction();
               //redis key的命名空间 spring:session:
               private String redisNamespace = "";
               /**
               *ON_SAVE  当调用SessionRepository.save时候才被调用，web环境下就是响应提交的时候(默认)
               IMMEDIATE 当创建SessionRepository.createSession() 的时候或者给session设置属性的时候立即存入redis
               *ON_SAVE Only writes to Redis when SessionRepository.save(org.springframework.session.Session) is invoked. In a web environment this is typically done as soon as the HTTP response is committed.
               IMMEDIATE Writes to Redis as soon as possible. For example SessionRepository.createSession() will write the session to Redis. Another example is that setting an attribute on the session will also write to Redis immediately.
               **/
               private RedisFlushMode redisFlushMode = RedisFlushMode.ON_SAVE;
               //序列化方式
               private RedisSerializer