org.apache.wicket.request.cycle

Class RequestCycle

java.lang.Object

org.apache.wicket.request.cycle.RequestCycle

All Implemented Interfaces:

IEventSink, IRequestCycle

public class RequestCycle
extends Object
implements IRequestCycle, IEventSink

RequestCycle consists of two steps:

1. Resolve request handler
2. Execute request handler

During IRequestHandler execution the handler can schedule another IRequestHandler to run after it is done, or replace all IRequestHandlers on stack with another IRequestHandler.

Author:

Matej Knopp, igor.vaynberg

See Also:

scheduleRequestHandlerAfterCurrent(IRequestHandler), replaceAllRequestHandlers(IRequestHandler)

Constructor Summary

Constructors

Constructor and Description
RequestCycle(RequestCycleContext context) Construct.

Method Summary

Modifier and Type	Method and Description
void	detach() Detaches RequestCycle state.
<T extends IRequestHandler> Optional<T>	find(Class<T> type) Finds a IRequestHandler which is either the currently executing handler or is scheduled to be executed.
static RequestCycle	get() Returns request cycle associated with current thread.
IRequestHandler	getActiveRequestHandler()
protected int	getExceptionRetryCount()
RequestCycleListenerCollection	getListeners()
<T> T	getMetaData(MetaDataKey<T> key) Gets metadata for this request cycle using the given key.
Response	getOriginalResponse() Get the original response the request was created with.
Request	getRequest()
IRequestHandler	getRequestHandlerScheduledAfterCurrent()
Response	getResponse() Get the active response at the request cycle.
long	getStartTime()
UrlRenderer	getUrlRenderer() Returns UrlRenderer for this RequestCycle.
protected IRequestHandler	handleException(Exception e) Return IRequestHandler for the given exception.
<C extends Page> Url	mapUrlFor(Class<C> pageClass, PageParameters parameters) Returns a bookmarkable URL that references a given page class using a given set of page parameters.
Url	mapUrlFor(IRequestHandler handler) Returns URL for the request handler or null if the handler couldn't have been encoded.
Url	mapUrlFor(ResourceReference reference, PageParameters params) Returns a Url for the resource reference
protected UrlRenderer	newUrlRenderer()
protected void	onBeginRequest() Called when the request cycle object is beginning its response
void	onDetach() Called after request processing is complete, usually takes care of detaching state
protected void	onEndRequest() Called when the request cycle object has finished its response
void	onEvent(IEvent<?> event) Called when an event is sent to this sink
boolean	processRequest() Processes the request.
boolean	processRequestAndDetach() Convenience method that processes the request and detaches the RequestCycle.
void	replaceAllRequestHandlers(IRequestHandler handler)
protected IRequestHandler	resolveRequestHandler() Resolves current request to a IRequestHandler.
void	scheduleRequestHandlerAfterCurrent(IRequestHandler handler) Schedule the request handler to be executed after the current one.
<T> RequestCycle	setMetaData(MetaDataKey<T> key, T object) Sets the metadata for this request cycle using the given key.
void	setRequest(Request request) INTERNAL This method is for internal Wicket use.
Response	setResponse(Response response) Replaces the current Response with new Response instance.
void	setResponsePage(Class<? extends IRequestablePage> pageClass) Convenience method for setting next page to be rendered.
void	setResponsePage(Class<? extends IRequestablePage> pageClass, PageParameters parameters) Convenience method for setting next page to be rendered.
void	setResponsePage(Class<? extends IRequestablePage> pageClass, PageParameters parameters, RenderPageRequestHandler.RedirectPolicy redirectPolicy) Convenience method for setting next page to be rendered.
void	setResponsePage(Class<? extends IRequestablePage> pageClass, RenderPageRequestHandler.RedirectPolicy redirectPolicy) Convenience method for setting next page to be rendered.
void	setResponsePage(IRequestablePage page) Convenience method for setting next page to be rendered.
<C extends Page> CharSequence	urlFor(Class<C> pageClass, PageParameters parameters) Returns a rendered bookmarkable URL that references a given page class using a given set of page parameters.
CharSequence	urlFor(IRequestHandler handler) Returns the rendered URL for the request handler or null if the handler couldn't have been rendered.
CharSequence	urlFor(ResourceReference reference, PageParameters params) Returns a rendered Url for the resource reference

Methods inherited from class java.lang.Object

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

Constructor Detail

RequestCycle

public RequestCycle(RequestCycleContext context)

Construct.

Parameters:

context -

Method Detail

get

public static RequestCycle get()

Returns request cycle associated with current thread.

Returns:

request cycle instance or null if no request cycle is associated with current thread.

newUrlRenderer

protected UrlRenderer newUrlRenderer()

Returns:

a new url renderer

getOriginalResponse

public Response getOriginalResponse()

Get the original response the request was created with. Access to the original response may be necessary if the response has been temporarily replaced but the components require methods from original response (i.e. cookie methods of WebResponse, etc).

Returns:

The original response object.

getUrlRenderer

public final UrlRenderer getUrlRenderer()

Returns UrlRenderer for this RequestCycle.

Specified by:

getUrlRenderer in interface IRequestCycle

Returns:

UrlRenderer instance.

resolveRequestHandler

protected IRequestHandler resolveRequestHandler()

Resolves current request to a IRequestHandler.

Returns:

RequestHandler instance

getExceptionRetryCount

protected int getExceptionRetryCount()

Returns:

How many times will Wicket attempt to render the exception request handler before giving up.

processRequestAndDetach

public boolean processRequestAndDetach()

Convenience method that processes the request and detaches the RequestCycle.

Returns:

true if the request resolved to a Wicket request, false otherwise.

processRequest

public boolean processRequest()

Processes the request.

Returns:

true if the request resolved to a Wicket request, false otherwise.

handleException

protected IRequestHandler handleException(Exception e)

Return IRequestHandler for the given exception.

Parameters:

e - exception to handle

Returns:

RequestHandler instance

See Also:

IRequestCycleListener.onException(RequestCycle, Exception), IExceptionMapper.map(Exception)

getRequest

public Request getRequest()

Specified by:

getRequest in interface IRequestCycle

Returns:

current request

setRequest

public void setRequest(Request request)

INTERNAL This method is for internal Wicket use. Do not call it yourself unless you know what you are doing.

Parameters:

request -

setMetaData

public final <T> RequestCycle setMetaData(MetaDataKey<T> key,
                                          T object)

Sets the metadata for this request cycle using the given key. If the metadata object is not of the correct type for the metadata key, an IllegalArgumentException will be thrown. For information on creating MetaDataKeys, see MetaDataKey.

Type Parameters:

T -

Parameters:

key - The singleton key for the metadata

object - The metadata object

Throws:

IllegalArgumentException

See Also:

MetaDataKey

getMetaData

public final <T> T getMetaData(MetaDataKey<T> key)

Gets metadata for this request cycle using the given key.

Type Parameters:

T - The type of the metadata

Parameters:

key - The key for the data

Returns:

The metadata or null if no metadata was found for the given key

See Also:

MetaDataKey

mapUrlFor

public Url mapUrlFor(IRequestHandler handler)

Returns URL for the request handler or null if the handler couldn't have been encoded.

Note: The produced URL is relative to the filter path. Application code most probably need URL relative to the currently used page, for this use urlFor(org.apache.wicket.request.IRequestHandler)

Parameters:

handler - the request handler for which to create a callback url

Returns:

Url instance or null

mapUrlFor

public Url mapUrlFor(ResourceReference reference,
                     PageParameters params)

Returns a Url for the resource reference

Note: The produced URL is relative to the filter path. Application code most probably need URL relative to the currently used page, for this use urlFor(org.apache.wicket.request.resource.ResourceReference, org.apache.wicket.request.mapper.parameter.PageParameters)

Parameters:

reference - resource reference

params - parameters for the resource or null if none

Returns:

Url for the reference

mapUrlFor

public final <C extends Page> Url mapUrlFor(Class<C> pageClass,
                                            PageParameters parameters)

Returns a bookmarkable URL that references a given page class using a given set of page parameters. Since the URL which is returned contains all information necessary to instantiate and render the page, it can be stored in a user's browser as a stable bookmark.

Note: The produced URL is relative to the filter path. Application code most probably need URL relative to the currently used page, for this use urlFor(Class, org.apache.wicket.request.mapper.parameter.PageParameters)

Type Parameters:

C - The type of the page

Parameters:

pageClass - Class of page

parameters - Parameters to page or null if none

Returns:

Bookmarkable URL to page

urlFor

public final CharSequence urlFor(ResourceReference reference,
                                 PageParameters params)

Returns a rendered Url for the resource reference

Parameters:

reference - resource reference

params - parameters for the resource or null if none

Returns:

Url for the reference

urlFor

public final <C extends Page> CharSequence urlFor(Class<C> pageClass,
                                                  PageParameters parameters)

Returns a rendered bookmarkable URL that references a given page class using a given set of page parameters. Since the URL which is returned contains all information necessary to instantiate and render the page, it can be stored in a user's browser as a stable bookmark.

Type Parameters:

C -

Parameters:

pageClass - Class of page

parameters - Parameters to page or null if none

Returns:

Bookmarkable URL to page

urlFor

public CharSequence urlFor(IRequestHandler handler)

Returns the rendered URL for the request handler or null if the handler couldn't have been rendered.

The resulting URL will be relative to current page.

Parameters:

handler -

Returns:

Url String or null

detach

public final void detach()

Detaches RequestCycle state. Called after request processing is complete

onDetach

public void onDetach()

Called after request processing is complete, usually takes care of detaching state

setResponsePage

public void setResponsePage(IRequestablePage page)

Convenience method for setting next page to be rendered.

Parameters:

page -

setResponsePage

public void setResponsePage(Class<? extends IRequestablePage> pageClass)

Convenience method for setting next page to be rendered.

Parameters:

pageClass - The class of the page to render

setResponsePage

public void setResponsePage(Class<? extends IRequestablePage> pageClass,
                            RenderPageRequestHandler.RedirectPolicy redirectPolicy)

Convenience method for setting next page to be rendered.

Parameters:

pageClass - The class of the page to render

redirectPolicy - The policy to use when deciding whether to redirect or not

setResponsePage

public void setResponsePage(Class<? extends IRequestablePage> pageClass,
                            PageParameters parameters)

Convenience method for setting next page to be rendered.

Parameters:

pageClass - The class of the page to render

parameters - The query parameters for the page to be rendered

setResponsePage

public void setResponsePage(Class<? extends IRequestablePage> pageClass,
                            PageParameters parameters,
                            RenderPageRequestHandler.RedirectPolicy redirectPolicy)

Convenience method for setting next page to be rendered.

Parameters:

pageClass - The class of the page to render

parameters - The query parameters for the page to be rendered

redirectPolicy - The policy to use when deciding whether to redirect or not

getStartTime

public final long getStartTime()

Returns:

The start time for this request

onEvent

public void onEvent(IEvent<?> event)

Called when an event is sent to this sink

Specified by:

onEvent in interface IEventSink

onBeginRequest

protected void onBeginRequest()

Called when the request cycle object is beginning its response

onEndRequest

protected void onEndRequest()

Called when the request cycle object has finished its response

getListeners

public RequestCycleListenerCollection getListeners()

Returns:

listeners

getResponse

public Response getResponse()

Get the active response at the request cycle.

Specified by:

getResponse in interface IRequestCycle

Returns:

response

setResponse

public Response setResponse(Response response)

Replaces the current Response with new Response instance. The original response is always restored after the IRequestHandler.respond(IRequestCycle) method is finished.

Specified by:

setResponse in interface IRequestCycle

Returns:

Response being replaced.

scheduleRequestHandlerAfterCurrent

public void scheduleRequestHandlerAfterCurrent(IRequestHandler handler)

Schedule the request handler to be executed after the current one.

Specified by:

scheduleRequestHandlerAfterCurrent in interface IRequestCycle

getActiveRequestHandler

public IRequestHandler getActiveRequestHandler()

Returns:

active handler on executor

See Also:

RequestHandlerExecutor.getActive()

getRequestHandlerScheduledAfterCurrent

public IRequestHandler getRequestHandlerScheduledAfterCurrent()

Returns:

the handler scheduled to be executed after current by the executor

See Also:

RequestHandlerExecutor.next()

replaceAllRequestHandlers

public void replaceAllRequestHandlers(IRequestHandler handler)

Parameters:

handler -

See Also:

RequestHandlerExecutor.replaceAll(IRequestHandler)

find

public <T extends IRequestHandler> Optional<T> find(Class<T> type)

Finds a IRequestHandler which is either the currently executing handler or is scheduled to be executed.

Returns:

the found IRequestHandler or Optional.empty()