const mixinafBedSheet::HttpSession

afBedSheet::HttpSession

(Service) - An injectable const version of WebSession.

Provides a name/value map associated with a specific browser connection to the web server. A cookie (with the name fanws) is used to track which session is made available to the request.

All values stored in the session must be either immutable or serialisable. Note that immutable objects give better performance.

For scalable applications, the session should be used sparingly; house cleaned regularly and not used as a dumping ground.

Flash

Whereas normal session values are persisted indefinitely, flash vales only exist until the end of the next request. After that, they are removed from the session.

A common usage is to store message values before a redirect (usually after a form post). When the following page is rendered, the message is retrieved and displayed. After which the message is automatically discarded from the session.

(Flash: A-ah - Saviour of the Universe!)

containsKey

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abstract Bool containsKey(Str key)

Returns true if the session map contains the given key.

Calling this method does not create a session if it does not exist.

delete

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abstract Void delete()

Delete this web session which clears both the user agent cookie and the server side session instance. This method must be called before the WebRes is committed otherwise the server side instance is cleared, but the user agent cookie will remain uncleared.

Calling this method does not create a session if it does not exist.

@see web::WebSession.delete

exists

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abstract Bool exists()

Returns true if a session exists.

Wisp does not offer a sure-fire method of checking if a session actually exists or not. So in essence, all this does is check for the existence of a fanws wisp session cookie. It makes no assurances that the associated ID is valid or if the session has expired or not.

Calling this method does not create a session if it does not exist.

flash

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abstract Str:Obj? flash()

A map whose name/value pairs are persisted only until the end of the user's next HTTP request. (Note that actually they're persisted until the next request in which flash() is called again.)

The returned map is READ ONLY.

flashRemove

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abstract Obj? flashRemove(Str key)

Removes the key/value pair from flash and returns the value. If the key was not mapped then returns null.

Calling this method does not create a session if it does not exist.

flashSet

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abstract Void flashSet(Str key, Obj? val)

Sets the given value in the flash. The key/value pair will be persisted until the end of the user's next request.

Values must be immutable or serialisable.

Calling this method will create a session if it does not exist.

get

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@Operator abstract Obj? get(Str name, Obj? def := null)

Returns session value or def if not defined.

Calling this method does not create a session if it does not exist.

@see web::WebSession.get

getOrAdd

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abstract Obj? getOrAdd(Str key, |Str->Obj? valFunc)

Convenience for map.getOrAdd(name, valFunc).

Calling this will create a session if it doesn't already exist.

id

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abstract Str id()

Get the unique id used to identify this session.

Calling this method will create a session if it does not exist.

@see web::WebSession.id

isEmpty

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abstract Bool isEmpty()

Returns true if the session map is empty.

Calling this method does not create a session if it does not exist.

onCreate

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abstract Void onCreate(|HttpSession fn)

Adds an event handler that gets called as soon as a session is created.

Callbacks may be mutable, do not need to be cleaned up, but should be added at the start of every HTTP request.

Note that due to limitations of the underlying web::WebSession class, BedSheet must store a token "afBedSheet.exists" value in the session to ensure onCreate() is called at the appropriate time.

remove