Try the second one I sent out... That one is simpler and easier to understand.
Thanks
On Jul 15, 2011, at 1:52 PM, Chuck Hill wrote:
> I will try it later.
>
>
> On 2011-07-15, at 7:11 AM, Ricardo J. Parada wrote:
>
>>
>> I have some good news. I have a little test app with a simple Main
>> component that reproduces the problem in 5 easy steps.
>>
>> Who is interested in trying it out? :-) You just import into Eclipse and
>> follow the 5 easy steps on the Main component.
>>
>> <PageCacheTest.zip>
>>
>>
>>
>>
>>
>> On Jul 14, 2011, at 1:09 PM, Chuck Hill wrote:
>>
>>> I have, sort of, understood this code in the past. It is tricky, you
>>> really have to pay attention. IIRC what it has is a two level cache for
>>> (potentially) every page in the regular cache.
>>>
>>>
>>> Chuck
>>>
>>>
>>> On 2011-07-14, at 9:39 AM, Ricardo J. Parada wrote:
>>>
>>>>
>>>>
>>>> Oh... for reference that code in ERXAjaxSession.java looks like this:
>>>>
>>>> public void savePage(WOComponent page) {
>>>> ...
>>>>
>>>> // Remove the oldest entry if we're about to add a new one and that
>>>> would put us over the cache size ...
>>>> // We do a CACHE_SIZE*2 here because for every page, we have to
>>>> potentially store its previous contextid to prevent
>>>> // race conditions, so there technically can be 2x cache size many
>>>> pages in the cache.
>>>> boolean removedCacheEntry =
>>>> cleanPageReplacementCacheIfNecessary(pageCacheKey);
>>>> 208: if (!removedCacheEntry && pageReplacementCache.size() >=
>>>> ERXAjaxSession.MAX_PAGE_REPLACEMENT_CACHE_SIZE * 2) {
>>>> Iterator entryIterator = pageReplacementCache.entrySet().iterator();
>>>> Map.Entry oldestEntry = (Map.Entry) entryIterator.next();
>>>> entryIterator.remove();
>>>> if (logger.isDebugEnabled()) logger.debug(pageCacheKey +
>>>> "pageReplacementCache too large, removing oldest entry = " +
>>>> ((TransactionRecord)oldestEntry.getValue()).key());
>>>> }
>>>>
>>>> ...
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On Jul 14, 2011, at 12:33 PM, Ricardo J. Parada wrote:
>>>>
>>>>> I don't understand the code in ERXAjaxSession.java:208-213 very well but
>>>>> I can see that the size of the page replacement cache referred to by that
>>>>> code is growing with every AJAX request until it is >= two times the size
>>>>> specified by er.extensions.maxPageReplacementCacheSize. From there on it
>>>>> removes entries from there.
>>>>>
>>>>> At this point if I close the dialog (AMD) and then click on the link on
>>>>> the page I get the "You backtracked too far" error.
>>>>>
>>>>> Anybody understands that code? :-)
>>>>>
>>>>> I'm gonna compare with my test Wonder app which all it has is the AMD and
>>>>> link on the page to test this and try to find out why I don't get the
>>>>> error there.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Jul 14, 2011, at 12:11 PM, Ricardo J. Parada wrote:
>>>>>
>>>>>>
>>>>>>
>>>>>> I don't get the error if I set
>>>>>> er.extensions.maxPageReplacementCacheSize=50 in my Properties.dev file.
>>>>>>
>>>>>> So now I'm focusing on ERXAjaxSession.java:208-213 to see if that code
>>>>>> to try to figure out if that code has anything to do with the problem I
>>>>>> have when I reduce the cache size.
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Jul 13, 2011, at 10:36 PM, Alexis Tual wrote:
>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> have you tried to raise the er.extensions.maxPageReplacementCacheSize
>>>>>>> (default is 30) ? It should delay the page restauration error, not
>>>>>>> fixing the real issue... and if you have few users and enough memory,
>>>>>>> it might be the cheapest way to get it done.
>>>>>>> Anyway, I filled a jira for this a year ago
>>>>>>> http://issues.objectstyle.org/jira/browse/WONDER-545 (Don't try the
>>>>>>> attached patch though, it's worse :))
>>>>>>>
>>>>>>> Still in Quebec, back to Poutine free area soon
>>>>>>>
>>>>>>> Alex
>>>>>>>
>>>>>>> Le 12 juil. 2011 à 19:29, Ricardo J. Parada a écrit :
>>>>>>>
>>>>>>>>
>>>>>>>> On Jul 12, 2011, at 5:53 PM, Chuck Hill wrote:
>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Jul 12, 2011, at 2:45 PM, Ricardo J. Parada wrote:
>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Jul 12, 2011, at 4:52 PM, Chuck Hill wrote:
>>>>>>>>>>
>>>>>>>>>>> Hi Ricardo,
>>>>>>>>>>>
>>>>>>>>>>> On Jul 12, 2011, at 1:35 PM, Ricardo J. Parada wrote:
>>>>>>>>>>>>
>>>>>>>>>>>> Does anybody have an idea what could be causing this problem? The
>>>>>>>>>>>> user clicks on an AjaxModalDialogOpener which opens the dialog.
>>>>>>>>>>>> Then the user does a whole bunch of stuff in the dialog that
>>>>>>>>>>>> involves many clicks
>>>>>>>>>>>
>>>>>>>>>>> Does it still happen if they don't make so many clicks?
>>>>>>>>>>
>>>>>>>>>> If they make a few clicks then it works okay.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>>> then finally clicks a DONE link to close the dialog.
>>>>>>>>>>>
>>>>>>>>>>> Are all of these links and clicks Ajax actions?
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Yes, they are clicking on links generated by AjaxSubmitButton
>>>>>>>>>> components to be exact. :-)
>>>>>>>>>
>>>>>>>>> And you are certain that there are no /wo/ or /wa/ requests mixed in
>>>>>>>>> here?
>>>>>>>>
>>>>>>>> I set this property in my Properties.dev:
>>>>>>>>
>>>>>>>> log4j.logger.er.extensions.ERXApplication.RequestHandling=DEBUG
>>>>>>>>
>>>>>>>> and then I looked at all the uri's of the requests coming in. They
>>>>>>>> have /ajax/ in there and when the dialog first comes up I see a few
>>>>>>>> /_wr_/ and I guess the browser caches those since I don't see requests
>>>>>>>> for those anymore on subsequent requests after the dialog is displayed.
>>>>>>>>
>>>>>>>> All the requests for the "many clicks" I mentioned have /ajax/ in
>>>>>>>> them. I don't see any /wo/ requests mixed in.
>>>>>>>>
>>>>>>>> Also I set a breakpoint in ERXAjaxSession.java at the only place it
>>>>>>>> calls super.savePage() where I assume the current page would be saved
>>>>>>>> but I never hit the breakpoint. I would think that regular component
>>>>>>>> requests would be generating new context IDs and therefore saving the
>>>>>>>> page in the cache for those context IDs. But I don't see the page
>>>>>>>> getting saved. :-/
>>>>>>>>
>>>>>>>>
>>>>>>>>>
>>>>>>>>>>>> The dialog has a closeUpdateContainerID bound with the id of an
>>>>>>>>>>>> ajax update container to refresh, which it does refresh upon
>>>>>>>>>>>> closing the dialog. But then the user clicks on a link on the
>>>>>>>>>>>> page that is outside the refreshed AjaxUpdateContainer and the app
>>>>>>>>>>>> displays the error "You backtracked too far. The application
>>>>>>>>>>>> backtracking limit of 30 has been exceeded."
>>>>>>>>>>>
>>>>>>>>>>> Ajax links or regular component actions links? I do what seems to
>>>>>>>>>>> be the same thing (except maybe the "does a whole bunch of stuff in
>>>>>>>>>>> the dialog") and have not had any problems.
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> They are regular component action links. The context ID for which
>>>>>>>>>> the page is being restored is 22.
>>>>>>>>>
>>>>>>>>> The original URL is 21?
>>>>>>>>>
>>>>>>>>
>>>>>>>> Well, I just put in there a <wo:link string="test" action="$test"/>
>>>>>>>> and by inspecting that link after I close the ajax modal dialog and
>>>>>>>> the update container refreshes the href for the link is:
>>>>>>>>
>>>>>>>> http://192.168.1.9:53295/cgi-bin/WebObjects/Phynance.woa/wo/EmqPpwSYBiOiS7PPSLDXzw/8.0.0.9.1.1.13.1.5.1.2.1.1.3.51
>>>>>>>>
>>>>>>>> and clicking that generates the "You backtracked too far" error.
>>>>>>>>
>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>>> The key to tracking this down is to know if it is the Ajax or the
>>>>>>>>>>> regular page cache that is missing the component.
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> I'm stepping through the restorePageForContextID() in
>>>>>>>>>> ERXAjaxSession.java but I'm not sure what to look for.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Sorry, I just meant if the URL that caused the error was a /ajax/ or
>>>>>>>>> /wo/ URL. It sounds like a /wo/ URL so that suggests to me that
>>>>>>>>> something in your dialog is generating /wo/ or /wa/ requests that are
>>>>>>>>> pushing the page out of the standard page cache.
>>>>>>>>
>>>>>>>> I did not see any /wo/ nor /wa/ requests. They are all /ajax/
>>>>>>>> requests.
>>>>>>>>
>>>>>>>> Maybe I'll try to create a test Wonder app with an ajax modal dialog
>>>>>>>> with a single ajax link in it that displays the current time when
>>>>>>>> clicked... Then I can click it many many times. Then close the dialog
>>>>>>>> and then click on a link on the page afterwards to see if I can
>>>>>>>> reproduce.
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>> Chuck
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> Chuck Hill Senior Consultant / VP Development
>>>>>>>>>
>>>>>>>>> Come to WOWODC this July for unparalleled WO learning opportunities
>>>>>>>>> and real peer to peer problem solving! Network, socialize, and enjoy
>>>>>>>>> a great cosmopolitan city. See you there!
>>>>>>>>> http://www.wocommunity.org/wowodc11/
>>>>>>>>>
>>>>>>>>
>>>>>>>> _______________________________________________
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>>>>>>>>
>>>>>>>> This email sent to [email protected]
>>>>>>>
>>>>>>
>>>>>> _______________________________________________
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>>>>>>
>>>>>> This email sent to [email protected]
>>>>>
>>>>
>>>
>>> --
>>> Chuck Hill Senior Consultant / VP Development
>>>
>>> Practical WebObjects - for developers who want to increase their overall
>>> knowledge of WebObjects or who are trying to solve specific problems.
>>> http://www.global-village.net/products/practical_webobjects
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>
> --
> Chuck Hill Senior Consultant / VP Development
>
> Practical WebObjects - for developers who want to increase their overall
> knowledge of WebObjects or who are trying to solve specific problems.
> http://www.global-village.net/products/practical_webobjects
>
>
>
>
>
>
>
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