org.springframework.web.servlet.support

Class AbstractFlashMapManager

java.lang.Object

org.springframework.web.servlet.support.AbstractFlashMapManager

All Implemented Interfaces:

FlashMapManager

Direct Known Subclasses:

SessionFlashMapManager

public abstract class AbstractFlashMapManager
extends Object
implements FlashMapManager

A base class for FlashMapManager implementations.

Since:

3.1.1

Author:

Rossen Stoyanchev, Juergen Hoeller, Sam Brannen

Field Summary

Fields

Modifier and Type	Field and Description
protected Log	logger

Constructor Summary

Constructors

Constructor and Description
AbstractFlashMapManager()

Method Summary

Modifier and Type	Method and Description
protected Object	getFlashMapsMutex(HttpServletRequest request) Obtain a mutex for modifying the FlashMap List as handled by retrieveFlashMaps(javax.servlet.http.HttpServletRequest) and updateFlashMaps(java.util.List<org.springframework.web.servlet.FlashMap>, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse),
int	getFlashMapTimeout() Return the amount of time in seconds before a FlashMap expires.
UrlPathHelper	getUrlPathHelper() Return the UrlPathHelper implementation to use.
protected boolean	isFlashMapForRequest(FlashMap flashMap, HttpServletRequest request) Whether the given FlashMap matches the current request.
FlashMap	retrieveAndUpdate(HttpServletRequest request, HttpServletResponse response) Find a FlashMap saved by a previous request that matches to the current request, remove it from underlying storage, and also remove other expired FlashMap instances.
protected abstract List<FlashMap>	retrieveFlashMaps(HttpServletRequest request) Retrieve saved FlashMap instances from the underlying storage.
void	saveOutputFlashMap(FlashMap flashMap, HttpServletRequest request, HttpServletResponse response) Save the given FlashMap, in some underlying storage and set the start of its expiration period.
void	setFlashMapTimeout(int flashMapTimeout) Set the amount of time in seconds after a FlashMap is saved (at request completion) and before it expires.
void	setUrlPathHelper(UrlPathHelper urlPathHelper) Set the UrlPathHelper to use to match FlashMap instances to requests.
protected abstract void	updateFlashMaps(List<FlashMap> flashMaps, HttpServletRequest request, HttpServletResponse response) Update the FlashMap instances in the underlying storage.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

logger

protected final Log logger

Constructor Detail

AbstractFlashMapManager

public AbstractFlashMapManager()

Method Detail

setFlashMapTimeout

public void setFlashMapTimeout(int flashMapTimeout)

Set the amount of time in seconds after a FlashMap is saved (at request completion) and before it expires.

The default value is 180 seconds.

getFlashMapTimeout

public int getFlashMapTimeout()

Return the amount of time in seconds before a FlashMap expires.

setUrlPathHelper

public void setUrlPathHelper(UrlPathHelper urlPathHelper)

Set the UrlPathHelper to use to match FlashMap instances to requests.

getUrlPathHelper

public UrlPathHelper getUrlPathHelper()

Return the UrlPathHelper implementation to use.

retrieveAndUpdate

@Nullable
public final FlashMap retrieveAndUpdate(HttpServletRequest request,
                                                  HttpServletResponse response)

Description copied from interface: FlashMapManager

Find a FlashMap saved by a previous request that matches to the current request, remove it from underlying storage, and also remove other expired FlashMap instances.

This method is invoked in the beginning of every request in contrast to FlashMapManager.saveOutputFlashMap(org.springframework.web.servlet.FlashMap, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse), which is invoked only when there are flash attributes to be saved - i.e. before a redirect.

Specified by:

retrieveAndUpdate in interface FlashMapManager

Parameters:

request - the current request

response - the current response

Returns:

a FlashMap matching the current request or null

isFlashMapForRequest

protected boolean isFlashMapForRequest(FlashMap flashMap,
                                       HttpServletRequest request)

Whether the given FlashMap matches the current request. Uses the expected request path and query parameters saved in the FlashMap.

saveOutputFlashMap

public final void saveOutputFlashMap(FlashMap flashMap,
                                     HttpServletRequest request,
                                     HttpServletResponse response)

Description copied from interface: FlashMapManager

Save the given FlashMap, in some underlying storage and set the start of its expiration period.

NOTE: Invoke this method prior to a redirect in order to allow saving the FlashMap in the HTTP session or in a response cookie before the response is committed.

Specified by:

saveOutputFlashMap in interface FlashMapManager

Parameters:

flashMap - the FlashMap to save

request - the current request

response - the current response

retrieveFlashMaps

@Nullable
protected abstract List<FlashMap> retrieveFlashMaps(HttpServletRequest request)

Retrieve saved FlashMap instances from the underlying storage.

Parameters:

request - the current request

Returns:

a List with FlashMap instances, or null if none found

updateFlashMaps

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

Update the FlashMap instances in the underlying storage.

Parameters:

flashMaps - a (potentially empty) list of FlashMap instances to save

request - the current request

response - the current response

getFlashMapsMutex

@Nullable
protected Object getFlashMapsMutex(HttpServletRequest request)

Obtain a mutex for modifying the FlashMap List as handled by retrieveFlashMaps(javax.servlet.http.HttpServletRequest) and updateFlashMaps(java.util.List<org.springframework.web.servlet.FlashMap>, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse),

The default implementation returns a shared static mutex. Subclasses are encouraged to return a more specific mutex, or null to indicate that no synchronization is necessary.

Parameters:

request - the current request

Returns:

the mutex to use (may be null if none applicable)

Since:

4.0.3