## org.springframework.web.servlet.support
Class SessionFlashMapManager

    java.lang.Object
      org.springframework.web.servlet.support.AbstractFlashMapManager
          org.springframework.web.servlet.support.SessionFlashMapManager

All Implemented Interfaces:
  FlashMapManager

    public class SessionFlashMapManager

extends AbstractFlashMapManager

Store and retrieve `FlashMap` instances to and from the HTTP session.

Since:
  3.1.1
Author:
  Rossen Stoyanchev

Field Summary

Fields inherited from class org.springframework.web.servlet.support.AbstractFlashMapManager
`logger`

Constructor Summary
`SessionFlashMapManager()`

Method Summary
`protected List<FlashMap>` `retrieveFlashMaps(HttpServletRequest request)` Retrieve saved FlashMap instances from the HTTP Session.
`protected void` `updateFlashMaps(List<FlashMap> flashMaps, HttpServletRequest request, HttpServletResponse response)` Save the given FlashMap instance, if not empty, in the HTTP session.

Methods inherited from class org.springframework.web.servlet.support.AbstractFlashMapManager
`getFlashMapTimeout, getUrlPathHelper, isFlashMapForRequest, retrieveAndUpdate, saveOutputFlashMap, setFlashMapTimeout, setUrlPathHelper`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### SessionFlashMapManager

    public SessionFlashMapManager()

Method Detail

### retrieveFlashMaps

    protected List<FlashMap> retrieveFlashMaps(HttpServletRequest request)

  Retrieve saved FlashMap instances from the HTTP Session.

  Does not cause an HTTP session to be created but may update it if a FlashMap matching the current request is found or there are expired FlashMap to be removed.

  Specified by:
    `retrieveFlashMaps` in class `AbstractFlashMapManager`
  Parameters:
    `request` - the current request
  Returns:
    a List with FlashMap instances or `null`

### updateFlashMaps

    protected void updateFlashMaps(List<FlashMap> flashMaps,
                                   HttpServletRequest request,
                                   HttpServletResponse response)

  Save the given FlashMap instance, if not empty, in the HTTP session.

  Specified by:
    `updateFlashMaps` in class `AbstractFlashMapManager`
  Parameters:
    `flashMaps` - a non-empty list of FlashMap instances to save
    `request` - the current request
    `response` - the current response