public void ParsingRdfXmlStreamingDoesNotExhaustMemory()
{
IGraph g = new Graph();
GraphHandler graphHandler = new GraphHandler(g);
PagingHandler paging = new PagingHandler(graphHandler, 1000);
CountHandler counter = new CountHandler();
ChainedHandler handler = new ChainedHandler(new IRdfHandler[] { paging, counter });
GZippedRdfXmlParser parser = new GZippedRdfXmlParser(RdfXmlParserMode.Streaming);
parser.Load(handler, @"resources\oom.rdf.gz");
Assert.False(g.IsEmpty);
Assert.Equal(1000, counter.Count);
// Note that the source produces some duplicate triples so triples in the graph will be at most 1000
Assert.True(g.Triples.Count <= 1000);
}
// ===============================================================================
// Invoke
// ======
public PagingResultBean <ENTITY> InvokePaging(PagingHandler <ENTITY> handler)
{
AssertObjectNotNull("handler", handler);
PagingBean pagingBean = handler.PagingBean;
AssertObjectNotNull("handler.getPagingBean()", pagingBean);
if (!pagingBean.IsFetchScopeEffective)
{
String msg = "The paging bean is not effective about fetch-scope!";
msg = msg + " When you select page, you should set up fetch-scope of paging bean(Should invoke fetchFirst() and fetchPage()!).";
msg = msg + " The paging bean is: " + pagingBean;
throw new SystemException(msg);
}
int allRecordCount;
IList <ENTITY> selectedList;
if (_countLater) // not implemented about performance optimization
{
selectedList = handler.Paging();
allRecordCount = handler.Count();
}
else
{
allRecordCount = handler.Count();
selectedList = handler.Paging();
}
PagingResultBean <ENTITY> rb = new ResultBeanBuilder <ENTITY>(_tableDbName).BuildPagingResultBean(pagingBean, allRecordCount, selectedList);
if (pagingBean.CanPagingReSelect && IsNecessaryToReadPageAgain(rb))
{
pagingBean.FetchPage(rb.AllPageCount);
int reAllRecordCount = handler.Count();
IList <ENTITY> reSelectedList = handler.Paging();
return(new ResultBeanBuilder <ENTITY>(_tableDbName).BuildPagingResultBean(pagingBean, reAllRecordCount, reSelectedList));
}
else
{
return(rb);
}
}
