template<typename K, typename V>
class hazelcast::client::query::paging_predicate< K, V >
NOTE: paging_predicate can only be used with values(), keySet() and entries() methods!
!!
This class is a special Predicate which helps to get a page-by-page result of a query. It can be constructed with a page-size, an inner predicate for filtering, and a comparator for sorting. This class is not thread-safe and stateless. To be able to reuse for another query, one should call paging_predicate#reset()
Here is an example usage.
Predicate lessEqualThanFour = Predicates.lessEqual("this", 4);
// We are constructing our paging predicate with a predicate and page size.
In this case query results fetched two by two. paging_predicate predicate =
new paging_predicate(lessEqualThanFour, 2);
// we are initializing our map with integers from 0 to 10 as keys and values.
IMap map = hazelcastInstance.getMap(...);
for (int i = 0; i < 10; i++) {
map.put(i, i);
}
// invoking the query
Collection<Integer> values = map.values(predicate);
System.out.println("values = " + values) // will print 'values = [0, 1]'
predicate.nextPage(); // we are setting up paging predicate to fetch next
page in the next call. values = map.values(predicate);
System.out.println("values = " + values);// will print 'values = [2, 3]'
Entry anchor = predicate.getAnchor();
System.out.println("anchor -> " + anchor); // will print 'anchor -> 1=1',
since the anchor is the last entry of the previous page.
predicate.previousPage(); // we are setting up paging predicate to fetch
previous page in the next call values = map.values(predicate);
System.out.println("values = " + values) // will print 'values = [0, 1]'
Definition at line 116 of file paging_predicate.h.
1.14.0