which means this method can't work:
public interface IRequestTarget
{
/**
* @param requestCycle
* the current request cycle
*
* @return Any lock to be used to synchronize this target.
*/
Object getLock(RequestCycle requestCycle);
}
i think we're going to have to hard-code all the session locks.
Jonathan Locke wrote:
just realized that the target lock problem will get much worse if igor
ever gets his way with delayed init. then components could naively
do something involving the parent that wound up accessing the session.
Jonathan Locke wrote:
i think you should be synchronizing on the target's lock, retrieved
by target.getLock()
Martijn Dashorst wrote:
Here's my patch for this code. I think this should work but I'd like
others to take a look at it:
I changed the page construction, such that it is done within a
synchronized block which synchronizes on the session object.
In class: wicket.request.compound.DefaultRequestTargetResolverStrategy
protected IRequestTarget resolveBookmarkablePage(RequestCycle
requestCycle,
RequestParameters requestParameters)
{
String bookmarkablePageClass =
requestParameters.getBookmarkablePageClass();
Session session = requestCycle.getSession();
Application application = session.getApplication();
Class pageClass;
try
{
pageClass =
session.getClassResolver().resolveClass(bookmarkablePageClass);
}
catch (RuntimeException e)
{
return new
WebErrorCodeResponseTarget(HttpServletResponse.SC_NOT_FOUND,
"Unable to load Bookmarkable Page");
}
try
{
final IPageFactory pageFactory = session.getPageFactory();
synchronized (session) {
Page newPage = pageFactory.newPage(pageClass,
new
PageParameters(requestParameters.getParameters()));
// the response might have been set in the
constructor of
// the bookmarkable page
IRequestTarget requestTarget =
requestCycle.getRequestTarget();
// is it possible that there is already another
request target at
// this point then the 2 below?
if (!(requestTarget instanceof IPageRequestTarget ||
requestTarget instanceof IBookmarkablePageRequestTarget))
{
requestTarget = new PageRequestTarget(newPage);
}
return requestTarget;
}
}
catch (RuntimeException e)
{
throw new WicketRuntimeException("Unable to instantiate
Page class: "
+ bookmarkablePageClass + ". See below for
details.", e);
}
}
On 1/5/06, *Martijn Dashorst* <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
Testcase:
Take wicket examples, linkomatic.
Put a breakpoint on the Page3 constructor. Click on the pagelink
to the Page3 page twice (on the same page) and see two threads
waiting.
The synchronized block seems to be too late.
Martijn
On 1/5/06, *Martijn Dashorst* <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
According to our limited test, BookmarkablePageTargets are
executed outside the synchronized block. This means that any
session access in the constructor of the Page is not
synchronized, and will get you into trouble. This is what
happens in our application.
Questions:
- is this by design?
- has anyone changed this behavior since december 16?
Martijn
-- Living a wicket life...
Martijn Dashorst - http://www.jroller.com/page/dashorst
<http://www.jroller.com/page/dashorst>
Wicket 1.1 is out: http://wicket.sourceforge.net/wicket-1.1
-- Living a wicket life...
Martijn Dashorst - http://www.jroller.com/page/dashorst
Wicket 1.1 is out: http://wicket.sourceforge.net/wicket-1.1
--
Living a wicket life...
Martijn Dashorst - http://www.jroller.com/page/dashorst
Wicket 1.1 is out: http://wicket.sourceforge.net/wicket-1.1
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