Hello Werner,
Thanks for your response... Your code was very
useful to me!
I have a thousand of doubts about other jsf engines
yet...
I will try to carry on studying examples and
reading messages from this mailing list...
Thanks again,
Joao Bortoletto
--- Werner Punz <[EMAIL PROTECTED]> wrote:
> ok, I forgot a small fix which I did today:
> @SuppressWarnings(value={"unchecked"})
> private Object getObjectFromCache() {
> if (_cacheWindow.size() == 0)
> return null;
> if(getRowIndex() - _cacheWindowPos >=
> _cacheWindow.size())
> refillCache();
> return
> _cacheWindow.get(Math.min(_cacheWindow.size()-1,
> Math.max(0,
> getRowIndex() - _cacheWindowPos)));
> }
>
>
> replace the same method below with the fixed one
> here
>
>
>
> Werner Punz wrote:
> > Joao Bortoletto wrote:
> >
> >> Hi friends,
> >>
> >> Following your suggestions I built my own
> >> DataModel...
> >> (Werner, you warned me about "a" or "b"
> ways...
> >> Option "b" really seemed usefull, but I chose "a"
> >> because I have a rope rounding my neck... :-D)
> >> Ok... now I have my own model, but it is
> static
> >> yet. So... How can I access other data from
> controller
> >> or view from it?
> >> Let me explain better... I'm working
> with a managed bean
> >> and its gives data
> >> to a x:dataTable through a "getList" method.
> These
> >> data may depends on criteria inside a request,
> for
> >> example... how can I achieve this task?
> >> Is there another way to accomplish it?
> >>
> > Yes, you dont have to serve an entire list... you
> can implement your own
> > Datamodel and
> > have the datamodel itself serving it...
> >
> > Here is a rather huge example from my code which
> has not really publish
> > quality yet:
> >
> > note as you can see the code is rather overly
> complicated the reason for
> > this is sort of the prefetching of single pages,
> with a pageview
> > controller I probably could have skipped half the
> lines of code, hence,
> > I warned against approach a of prefetching:
> >
> > Explanation follows below the code:
> >
> > public class HibernateDataModel extends DataModel
> implements ICacheObject {
> >
> > // define a cachingWindow to keep the number
> of
> > // connections/accessno at a sane level
> > // from time to time an isolation level error
> > // can occur since we seal the objects off
> > // and then close the connection
> > // so no real data integrity can be performed
> that way
> > // but it should be good enough for the
> average webapp
> > int _cacheWindowSize = 30;
> > // array list due to the fact that this one
> has the fastes
> > // absolute access which is necessary for
> paging
> > List _cacheWindow = new
> ArrayList(_cacheWindowSize);
> > // helper idcache for faster access
> > Map _idCache = new
> TreeMap();
> > // the cache window Position relative to the 0
> absolute
> > int _cacheWindowPos = 0;
> > boolean _cacheInvalidated =
> true;
> > // the standard variables which are defined by
> the system
> > int _rowCount = -1;
> > int _rowIndex = -1;
> > // the associated query accessor
> > IDataAccessor _queryDelegate = null;
> >
> > public void resetModel() {
> > _rowCount = -1;
> > _rowIndex = -1;
> > invalidateCache();
> > refillCache();
> > }
> >
> > /**
> > *
> > */
> > public HibernateDataModel(IDataAccessor
> queryDelegate) {
> > super();
> > setQueryDelegate(queryDelegate);
> > // refillCache();
> > }
> >
> > public HibernateDataModel() {
> > super();
> > }
> >
> > /*
> > * (non-Javadoc)
> > *
> > * @see
> javax.faces.model.DataModel#getRowCount() Return the
> number
> > of rows
> > * of data objects represented by this
> DataModel. If the number
> > of rows
> > * is unknown, or no wrappedData is
> available, return -1.
> > */
> > public int getRowCount() {
> > if (_rowCount == 0) {
> > return -1;
> > }
> > return _rowCount;
> > }
> >
> > /**
> > * setter accessed by the query object
> > *
> > * @param rowCount
> > */
> > public void setRowCount(int rowCount) {
> > this._rowCount = rowCount;
> > // if(_rowIndex >= _rowCount-1)
> > // _rowIndex = -1;
> > }
> >
> > // returns true if the dataset is within
> > boolean isCached() {
> > if (_cacheWindow == null ||
> _cacheWindow.size() == 0)
> > return false;
> > else
> > return ((_cacheWindowPos <=
> getRowIndex()) && (getRowIndex()
> > < (_cacheWindowPos + _cacheWindow.size())));
> > }
> >
> > /**
> > * refills the cache window upon the given row
> index this one in the
> > long
> > * term will possible be called from outside
> also
> > */
> > @SuppressWarnings(value={"unchecked"})
> > public void refillCache() {
> > // calculate a decent new cache window
> pos, if possible with the
> > current
> > // row index
> > // in the middle
> > _cacheWindowPos = Math.max(0,
> getRowIndex() - (_cacheWindowSize
> > / 2));
> > // refill the cache with the query
> > if (_cacheWindowSize > 0) {
> > _cacheWindow =
> _queryDelegate.queryDatasets(_cacheWindowPos,
> > _cacheWindowSize);
> > _idCache = new TreeMap();
> >
> > for (Object elem : _cacheWindow) {
> > _idCache.put(((BaseDatabaseObject)
> elem).getId(), elem);
> > }
> > setRowCount(_queryDelegate.getSize()
> );
> >
>
setRowIndex(Math.min(Math.max(_queryDelegate.getSize()-1,
>
> > 0), getRowIndex()));
> >
> > NavigationBean navBean2 =
> (NavigationBean)
> > JSFUtil.getManagedBean(Constants.MBEAN_NAVBEAN);
>
=== message truncated ===
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