[richfaces-issues] [JBoss JIRA] Created: (RF-5508) Provide a facility to cache on the browser the data/records that were already loaded through AJAX in tabPanel/scrollableDataTable. Also a refresh machanism is desired.

[Samba Siva Rao Kolusu (JIRA)]

Provide a facility to cache on the browser the data/records that were already loaded through AJAX in  tabPanel/scrollableDataTable. Also a refresh machanism is desired.
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                 Key: RF-5508
                 URL: https://jira.jboss.org/jira/browse/RF-5508
             Project: RichFaces
          Issue Type: Feature Request
    Affects Versions: 3.2.2
         Environment: Any JEE supporting Web/App Server  and any standards compliant Browser
            Reporter: Samba Siva Rao Kolusu


        It would be highly desirable to have the data already loaded through AJAX be cached on the Browser rather than fetching it again every time the component accessed! 
For example,in scrollableDataTable caching the data while we scroll down and showing the same when the user scrolls up makes reduces a lot of requests  to the server and queries to the database. Similarly, In case of tabPanel, loading the data  through AJAX only when the tab is created,and then displaying the cached data on every subsequent tab focus reduces so many requests to server.  Similarly the tree nodes can be cached if loaded through AJAX. In general,this feature can be applied to other components in situations where data is loaded through AJAX. Preferably, this caching feature should be made optional by providing an attribute at the component level.

 Also a means to refresh the cached data in the browser  should be put in the component itself  in either or both of the following ways :  
1.the end user explicitly requesting  "refresh cache" by clicking a link on the corresponding component or 
2.based on some input or on meeting certain criteria, the page developer should be able to clear the cache and load records freshly.

 It should be noticed that loading the same number of records as were there before clearing the cache (if they are still available) would be better from usability perspective.

Caching the data on the client-side  improves performance manifold for those sites where there won't be any changes in the existing data set. But if there would be new records being added or existing records being deleted in the database , then client-side caching may not be any option to choose. Or may be we must ponder over  how we can detect if there is a difference between the client-side cache and the data in the database,and then refresh the cache when a change is found!


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