Ideal solution to pagination (long lists)?
I am interested to know the ‘best’ practice for navigating through long lists. At the moment we have implemented Struts-layout for this purpose. Our implementation currently retrieves the full dataset and uses Struts-layout sorting and navigation pager options to navigate through the results. However the drawback of this approach is in performance as our application will contain long lists. I have read many articles and browsed many forums but haven’t yet been able to find a ‘best practice’ or ideal approach. Andrew
Re: Ideal solution to pagination (long lists)?
Hi Andrew, I suggest using displaytag with its external paging and sorting features http://displaytag.sourceforge.net/11/tut_externalSortAndPage.html Gareth Andrew Martin wrote: I am interested to know the ‘best’ practice for navigating through long lists. At the moment we have implemented Struts-layout for this purpose. Our implementation currently retrieves the full dataset and uses Struts-layout sorting and navigation pager options to navigate through the results. However the drawback of this approach is in performance as our application will contain long lists. I have read many articles and browsed many forums but haven’t yet been able to find a ‘best practice’ or ideal approach. Andrew -- Gareth Evans Senior Developer MSoft eSolutions Limited Technology Centre Inward Way Rossmore Business Park Ellesmere Port Cheshire CH65 3EN -- Tel:+44 (0)870 0100 704 Fax:+44 (0)870 9010 705 E-Mail: [EMAIL PROTECTED] Web:www.msoft.co.uk -- Terms: Please note that any prices quoted within this e-mail are subject to VAT. All program details and code described in this e-mail are subject to copyright © of MSoft eSolutions Limited and remain the intellectual property of MSoft eSolutions Limited. Any proposal or pricing information contained within this e-mail are subject to MSoft eSolutions' Terms and Conditions -- Disclaimer: This message is intended only for use of the addressee. If this message was sent to you in error, please notify the sender and delete this message. MSoft eSolutions Limited cannot accept responsibility for viruses, so please scan attachments. Views expressed in this message do not necessarily reflect those of MSoft eSolutions Limited who will not necessarily be bound by its contents. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Ideal solution to pagination (long lists)?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Andrew, Andrew Martin wrote: I am interested to know the ‘best’ practice for navigating through long lists. I haven't used Struts-layout, so I'm not sure how my suggestion will fit-in with your preferred display engine, but here goes, anyway. We have a search application that uses Lucene as an index and a database to store the actual data. Searches are performed using Lucene and then the real data is fetched for display. Needless to say, many results may be returned, so paging is necessary. Lucene basically returns an list of record ids to us, which we store in an array of ints, which is relatively small (even if /all/ records match the query, we'll only get 15k of ids back). We wrap that list in a paged record which contains a cache. This paged record object has a getRecord method that first checks to see if the record has already been loaded in the cache, and returns it if it was there. If it's a cache miss, then the cache is emptied and we load an entire page of records from the database to fill the cache. This allows the pager to believe that it's iterating through a complete list of data, while the underlying object is actually caching and discarding data so that only the essentials are kept in memory (that is, the complete list of record ids and the current page of full records). We keep that object in the user's session so that page reloads don't have to go back to the database and are nice and fast. I hope that helps, - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.6 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFFnQf19CaO5/Lv0PARAjO1AKC6iBQgG0LNlbfGpCbotNgxt2MCdwCgu7eJ oSdgiNJCQu9PCWo5zB/vIHw= =ewkK -END PGP SIGNATURE- - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Ideal solution to pagination (long lists)?
For struts2 tags, checkout https://issues.apache.org/struts/browse/WW-1569 The problem I have with displaytag is that in an effort to satisfy everyone's needs, it is infinitely configurable. IMHO, that makes it hard to figure out and hard to use. The other issue we had with display tags is that with struts2, it isn't backed by a freemarker template. Every other built-in tag in struts2 is backed by a freemarker template, which is a much better solution to customization issue. In the simple case, it will be simple, but it will also let you do the more complicated scenerio. Also checkout http://forum.springframework.org/showthread.php?t=33012 if your using spring. Tom Gareth Evans wrote: Hi Andrew, I suggest using displaytag with its external paging and sorting features http://displaytag.sourceforge.net/11/tut_externalSortAndPage.html Gareth Andrew Martin wrote: I am interested to know the ‘best’ practice for navigating through long lists. At the moment we have implemented Struts-layout for this purpose. Our implementation currently retrieves the full dataset and uses Struts-layout sorting and navigation pager options to navigate through the results. However the drawback of this approach is in performance as our application will contain long lists. I have read many articles and browsed many forums but haven’t yet been able to find a ‘best practice’ or ideal approach. Andrew - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Ideal solution to pagination (long lists)?
Making a suggestion is difficult without knowing what tools/tiers or other specifics are involved. Our MD4J [1] generated DAOs return implementations of a Page interface [2] for search queries. A Hibernate-based Page implementation [3] is also available. This serves generic memory and DB access requirements well (i.e. no caching on application level, only the results to be rendered are retreived from the DB on each call). [1] http://md4j.sourceforge.net/ [2] http://md4j.cvs.sourceforge.net/md4j/md4j/src/java/com/geekologue/md4j/dao/Page.java?view=markup [3] http://md4j.cvs.sourceforge.net/md4j/md4j/src/java/com/geekologue/md4j/dao/hibernate/HbmQueryResultPage.java?view=markup hth, Manos - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Ideal solution to pagination (long lists)?
Hi Andrew, I ran into similar problems. Anoter developer on the team wrote a tag. It extracts the paging information and goes to the database table to find out the total number of records. The tag retrieves and displays only the first set of records in accordance with the paging specification (say 10 records) together with links labeled as 1, 2, 3, 4, 5, .. at the bottom of the page. And the tag goes to the database table to find and display the next set of records in accordance with the specific link that is subsequently clicked by the user. The problem is that the tag works only in the session scope and also suffers performance hit when accommodating large number of users who are online simutaneously. Is there any better solution? -Caroline --- Gareth Evans [EMAIL PROTECTED] wrote: Hi Andrew, I suggest using displaytag with its external paging and sorting features http://displaytag.sourceforge.net/11/tut_externalSortAndPage.html Gareth Andrew Martin wrote: I am interested to know the âbestâ practice for navigating through long lists. At the moment we have implemented Struts-layout for this purpose. Our implementation currently retrieves the full dataset and uses Struts-layout sorting and navigation pager options to navigate through the results. However the drawback of this approach is in performance as our application will contain long lists. I have read many articles and browsed many forums but havenât yet been able to find a âbest practiceâ or ideal approach. Andrew -- Gareth Evans Senior Developer MSoft eSolutions Limited Technology Centre Inward Way Rossmore Business Park Ellesmere Port Cheshire CH65 3EN -- Tel:+44 (0)870 0100 704 Fax:+44 (0)870 9010 705 E-Mail: [EMAIL PROTECTED] Web:www.msoft.co.uk -- Terms: Please note that any prices quoted within this e-mail are subject to VAT. All program details and code described in this e-mail are subject to copyright © of MSoft eSolutions Limited and remain the intellectual property of MSoft eSolutions Limited. Any proposal or pricing information contained within this e-mail are subject to MSoft eSolutions' Terms and Conditions -- Disclaimer: This message is intended only for use of the addressee. If this message was sent to you in error, please notify the sender and delete this message. MSoft eSolutions Limited cannot accept responsibility for viruses, so please scan attachments. Views expressed in this message do not necessarily reflect those of MSoft eSolutions Limited who will not necessarily be bound by its contents. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
