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From Florian Müller <f...@apache.org>
Subject Re: ItemIterable page fetching
Date Wed, 08 Jan 2014 13:55:19 GMT
Hi Dan,

Whenever a new ItemIterable object is created, it gets fresh data from 
the server.
So, yes, calling itemIterable.skipTo(offset).getPage(100) gets you the 
fresh data and there are no plans to change this behavior.

- Florian


> Is it then safe to assume that every time I call
> itemIterable.skipTo(offset).getPage(100) I'll get fresh data from the
> server? will this stay the same in the future?
> 
> On 1/8/2014 3:06 PM, Florian Müller wrote:
> Hi Dan,
> 
> skipTo() and getPage() always create new ItemIterable objects and
> leave the original ItemIterable untouched.
> You can derive as many new ItemIterable objects with skipTo() and
> getPage() as you need.
> 
> 
> - Florian
> 
> 
> Hello,
> we use ItemIterable for paging through a query result. The data is
> displayed in a grid, page by page and the user can navigate back and
> forth.
> For the rendering phase we use a code similar to:
> 
> Iterable it = itemITerable.skipTo(offset).getPage(50);
> foreach(Object obj: it) {
> ......
> }
> 
> Now I have to implement a refresh button that would have to refresh the
> currently displayed page (fetch the data again from the server). I know
> that the clean solution is to run the query again and get a new 
> instance
> of ItemIterable and start from the same offset etc. but due to some
> awkward design decisions I am forced to work with the same ItemIterable
> instance and find a workaround.
> 
> I have investigated the implementations of AbstractIterable and
> AbstractIterator (mainly CollectionPageIterable and
> CollectionPageIterator) and found out that a call to getPage() always
> returns a newly created instance of CollectionPageIterable which in 
> turn
> will create a CollectionPageIterator which when requested to iterate
> will fetch the items from the server.
> 
> Is my understanding of the implementation correct?
> Can I assume that the behaviour will stay the same (is part of the
> public API) ?
> 
> Best regards,
> Dan.
> 
> 

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