Class SessionRequestHandler
- All Implemented Interfaces:
RequestHandler
,Serializable
RequestHandler
in
the session in turn until one produces a response. This method is used for
requests that have not been handled by any specific functionality in the
servlet.
The request handlers are invoked in the reverse order in which they were added to the session until a response has been produced. This means that the most recently added handler is used first and the first request handler that was added to the session is invoked towards the end unless any previous handler has already produced a response.
The session is not locked during execution of the request handlers. The request handler can itself decide if it needs to lock the session or not.
For internal use only. May be renamed or removed in a future release.
- Since:
- 1.0
- See Also:
-
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionboolean
handleRequest
(VaadinSession session, VaadinRequest request, VaadinResponse response) Called when a request needs to be handled.
-
Constructor Details
-
SessionRequestHandler
public SessionRequestHandler()
-
-
Method Details
-
handleRequest
public boolean handleRequest(VaadinSession session, VaadinRequest request, VaadinResponse response) throws IOException Description copied from interface:RequestHandler
Called when a request needs to be handled. If a response is written, this method should returntrue
to indicate that no more request handlers should be invoked for the request.Note that request handlers by default do not lock the session. If you are using VaadinSession or anything inside the VaadinSession you must ensure the session is locked. This can be done by extending
SynchronizedRequestHandler
or by usingVaadinSession.accessSynchronously(Command)
orUI.accessSynchronously(Command)
.- Specified by:
handleRequest
in interfaceRequestHandler
- Parameters:
session
- The session for the requestrequest
- The request to handleresponse
- The response object to which a response can be written.- Returns:
- true if a response has been written and no further request handlers should be called, otherwise false
- Throws:
IOException
- If an IO error occurred
-