uploaded files in page instance
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uploaded files in page instance
by fachhoch
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I have some huge files upto 50Mb in side my page instance , I have to
save them in page instance and I cannot reload it everytime from database becasue other users might delete the file . I am getting java.lang.OutOfMemoryError , only way I can resolve this is increasing heap size but Is this a bad idea storing files upto 50Mb inside page instance ? |
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Re: uploaded files in page instance
by igor.vaynberg
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store them in a temp directory and only give your page the filename.
-igor On Mon, Oct 19, 2009 at 10:55 AM, tubin gen <fachhoch@...> wrote: > I have some huge files upto 50Mb in side my page instance , I have to > save them in page instance and I cannot reload it everytime from database > becasue other users might delete the file . > > I am getting java.lang.OutOfMemoryError , only way I can resolve this is > increasing heap size but Is this a bad idea storing files upto 50Mb inside > page instance ? > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@... For additional commands, e-mail: users-help@... |
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Re: uploaded files in page instance
by fachhoch
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I show these files in almost all my pages.So every page before it loads has to create all these files in temp folder , please suggest me what should be the identifier to recognize these files ,I actually have these files inside PancelCachingTab , and this tab gets loaded only when user clicks on on it for the first time.
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Re: uploaded files in page instance
by fachhoch
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I have several pages which has links to uploaded files to download, I load this from database and save it inside page instance as instance variable . When user clicks on the download link I retrieve the byte array from the page instance and call download. Several user have different instances of same pages and all these pages have these huge files byte[] .
Sure this will cause Outof memory issues. To resolve this I have to use temp folder , every time a page instance gets created I have to create temp folder to save these uploaded files bytes with a proper name so that I can know this folder is for this user and this page and this instance. I am asking do I have to create a naming factory which names the folder for every page instance ? or is there anything available which I can use a as a folder name?
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Re: uploaded files in page instance
by jthomerson
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Why are you loading the files from the DB before the user asks for them
(clicks the download link)? Why are you saving the byte arrays in the page instance? If you really must load them from the DB before the user clicks the download link, save them to a temp file and save only the path of the file in the page (like Igor originally said). -- Jeremy Thomerson http://www.wickettraining.com On Mon, Oct 19, 2009 at 2:40 PM, fachhoch <fachhoch@...> wrote: > > I have several pages which has links to uploaded files to download, I > load > this from database and save it inside page instance as instance variable . > When user clicks on the download link I retrieve the byte array from the > page instance and call download. Several user have different instances > of same pages and all these pages have these huge files byte[] . > Sure this will cause Outof memory issues. > To resolve this I have to use temp folder , > every time a page instance gets created I have to create temp folder > to > save these uploaded files bytes with a proper name so that I can know this > folder is for this user and this page and this instance. I am asking do > I > have to create a naming factory which names the folder for every page > instance ? or is there anything available which I can use a as a folder > name? > > > > fachhoch wrote: > > > > I show these files in almost all my pages.So every page before it loads > > has to create all these files in temp folder , please suggest me what > > should be the identifier to recognize these files ,I actually have > these > > files inside PancelCachingTab , and this tab gets loaded only when user > > clicks on on it for the first time. > > > > > > > > igor.vaynberg wrote: > >> > >> store them in a temp directory and only give your page the filename. > >> > >> -igor > >> > >> On Mon, Oct 19, 2009 at 10:55 AM, tubin gen <fachhoch@...> wrote: > >>> I have some huge files upto 50Mb in side my page instance , I have > >>> to > >>> save them in page instance and I cannot reload it everytime from > >>> database > >>> becasue other users might delete the file . > >>> > >>> I am getting java.lang.OutOfMemoryError , only way I can resolve > this > >>> is > >>> increasing heap size but Is this a bad idea storing files upto 50Mb > >>> inside > >>> page instance ? > >>> > >> > >> --------------------------------------------------------------------- > >> To unsubscribe, e-mail: users-unsubscribe@... > >> For additional commands, e-mail: users-help@... > >> > >> > >> > > > > > > -- > View this message in context: > http://www.nabble.com/uploaded-files-in-page-instance-tp25962716p25964309.html > Sent from the Wicket - User mailing list archive at Nabble.com. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscribe@... > For additional commands, e-mail: users-help@... > > |
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Re: uploaded files in page instance
by fachhoch
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Why are you saving the byte arrays in the page instance? I show these files to user with read-only permission , so this user can just view these files ,the owner of these files can delete them anytime , so If I go to database , upon user click , this file might have been deleted by the user , or when user tries to access this file the owner might be deleting this file , to avoid such issues I am loading all the bytes to page instance , so no concurrent access issues . to save them inside temp folders can I ask the page to give some identifier which I can use to name the folder which contains all the files ? or do I have to create my own identifier ?
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Re: uploaded files in page instance
by igor.vaynberg
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what happens if the owner is deleting the file while you are copying
it to the temp dir??? -igor On Mon, Oct 19, 2009 at 12:54 PM, fachhoch <fachhoch@...> wrote: > > > Why are you saving the byte arrays in the page instance? > > I show these files to user with read-only permission , so this user can > just view these files ,the owner of these files can delete them anytime , so > If I go to database , upon user click , this file might have been > deleted by the user , or when user tries to access this file the owner > might be deleting this file , to avoid such issues I am loading all the > bytes to page instance , so no concurrent access issues . > to save them inside temp folders can I ask the page to give some identifier > which I can use to name the folder which contains all the files ? or do I > have to create my own identifier ? > > > jthomerson wrote: >> >> Why are you loading the files from the DB before the user asks for them >> (clicks the download link)? >> >> Why are you saving the byte arrays in the page instance? If you really >> must >> load them from the DB before the user clicks the download link, save them >> to >> a temp file and save only the path of the file in the page (like Igor >> originally said). >> >> -- >> Jeremy Thomerson >> http://www.wickettraining.com >> >> >> >> On Mon, Oct 19, 2009 at 2:40 PM, fachhoch <fachhoch@...> wrote: >> >>> >>> I have several pages which has links to uploaded files to download, I >>> load >>> this from database and save it inside page instance as instance variable >>> . >>> When user clicks on the download link I retrieve the byte array from the >>> page instance and call download. Several user have different >>> instances >>> of same pages and all these pages have these huge files byte[] . >>> Sure this will cause Outof memory issues. >>> To resolve this I have to use temp folder , >>> every time a page instance gets created I have to create temp folder >>> to >>> save these uploaded files bytes with a proper name so that I can know >>> this >>> folder is for this user and this page and this instance. I am asking >>> do >>> I >>> have to create a naming factory which names the folder for every page >>> instance ? or is there anything available which I can use a as a >>> folder >>> name? >>> >>> >>> >>> fachhoch wrote: >>> > >>> > I show these files in almost all my pages.So every page before it >>> loads >>> > has to create all these files in temp folder , please suggest me what >>> > should be the identifier to recognize these files ,I actually have >>> these >>> > files inside PancelCachingTab , and this tab gets loaded only when >>> user >>> > clicks on on it for the first time. >>> > >>> > >>> > >>> > igor.vaynberg wrote: >>> >> >>> >> store them in a temp directory and only give your page the filename. >>> >> >>> >> -igor >>> >> >>> >> On Mon, Oct 19, 2009 at 10:55 AM, tubin gen <fachhoch@...> >>> wrote: >>> >>> I have some huge files upto 50Mb in side my page instance , I >>> have >>> >>> to >>> >>> save them in page instance and I cannot reload it everytime from >>> >>> database >>> >>> becasue other users might delete the file . >>> >>> >>> >>> I am getting java.lang.OutOfMemoryError , only way I can resolve >>> this >>> >>> is >>> >>> increasing heap size but Is this a bad idea storing files upto 50Mb >>> >>> inside >>> >>> page instance ? >>> >>> >>> >> >>> >> --------------------------------------------------------------------- >>> >> To unsubscribe, e-mail: users-unsubscribe@... >>> >> For additional commands, e-mail: users-help@... >>> >> >>> >> >>> >> >>> > >>> > >>> >>> -- >>> View this message in context: >>> http://www.nabble.com/uploaded-files-in-page-instance-tp25962716p25964309.html >>> Sent from the Wicket - User mailing list archive at Nabble.com. >>> >>> >>> --------------------------------------------------------------------- >>> To unsubscribe, e-mail: users-unsubscribe@... >>> For additional commands, e-mail: users-help@... >>> >>> >> >> > > -- > View this message in context: http://www.nabble.com/uploaded-files-in-page-instance-tp25962716p25964541.html > Sent from the Wicket - User mailing list archive at Nabble.com. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscribe@... > For additional commands, e-mail: users-help@... > > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@... For additional commands, e-mail: users-help@... |
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Re: uploaded files in page instance
by Newgro
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fachhoch schrieb:
> Why are you saving the byte arrays in the page instance? > > I show these files to user with read-only permission , so this user can > just view these files ,the owner of these files can delete them anytime , so > If I go to database , upon user click , this file might have been > deleted by the user , or when user tries to access this file the owner > might be deleting this file , to avoid such issues I am loading all the > bytes to page instance , so no concurrent access issues . > to save them inside temp folders can I ask the page to give some identifier > which I can use to name the folder which contains all the files ? or do I > have to create my own identifier ? > > as "inUse" in DB and if it is in use deny delete? So user can only delete file if noone has a copy in use. And as Igor posted you can't guarantee that your processing never leads to your problem described above. Page identifier: You could use the page.id + sessionId Cheers Per --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@... For additional commands, e-mail: users-help@... |
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Re: uploaded files in page instance
by igor.vaynberg
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you guys ever hear of transactional isolation? :) databases handle all
this kind of neat stuff for you. -igor On Mon, Oct 19, 2009 at 11:09 PM, Per Newgro <per.newgro@...> wrote: > fachhoch schrieb: >> >> Why are you saving the byte arrays in the page instance? >> >> I show these files to user with read-only permission , so this user can >> just view these files ,the owner of these files can delete them anytime , >> so >> If I go to database , upon user click , this file might have been >> deleted by the user , or when user tries to access this file the owner >> might be deleting this file , to avoid such issues I am loading all the >> bytes to page instance , so no concurrent access issues . >> to save them inside temp folders can I ask the page to give some >> identifier >> which I can use to name the folder which contains all the files ? or do >> I >> have to create my own identifier ? >> >> > > With this issues i would rethink my design. Why don't you mark the file as > "inUse" in DB and if it is in use > deny delete? So user can only delete file if noone has a copy in use. And as > Igor posted you can't guarantee > that your processing never leads to your problem described above. > > Page identifier: > You could use the page.id + sessionId > > Cheers > Per > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscribe@... > For additional commands, e-mail: users-help@... > > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@... For additional commands, e-mail: users-help@... |
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Re: uploaded files in page instance
by Newgro
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Igor Vaynberg schrieb:
> you guys ever hear of transactional isolation? :) databases handle all > this kind of neat stuff for you. > > -igor > > Oh, i didn't saw that he tried it in one transaction. I thought it are multiple stateless steps. Sorry Per --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@... For additional commands, e-mail: users-help@... |
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Re: uploaded files in page instance
by fachhoch
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Is there any open source utility to write and manage files to temp folder , handle deletion , signle thread access etc ?
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