org.apache.ignite.springdata22.repository.query

Class IgniteRepositoryQuery.QueryCursorWrapper<T,V>

java.lang.Object

java.util.AbstractCollection<V>

org.apache.ignite.springdata22.repository.query.IgniteRepositoryQuery.QueryCursorWrapper<T,V>

Type Parameters:

T - input type

V - transformed output type

All Implemented Interfaces:

AutoCloseable, Iterable<V>, Collection<V>, QueryCursor<V>

Enclosing class:

IgniteRepositoryQuery

public static class IgniteRepositoryQuery.QueryCursorWrapper<T,V>
extends AbstractCollection<V>
implements QueryCursor<V>

Ignite QueryCursor wrapper.

Ensures closing underline cursor when there is no data.

Constructor Summary

Constructors

Constructor and Description
QueryCursorWrapper(QueryCursor<T> delegate, Function<T,V> transformer) Instantiates a new Query cursor wrapper.

Method Summary

Modifier and Type	Method and Description
void	close() Closes all resources related to this cursor.
List<V>	getAll() Gets all query results and stores them in the collection.
Iterator<V>	iterator()
int	size()

Methods inherited from class java.util.AbstractCollection

add, addAll, clear, contains, containsAll, isEmpty, remove, removeAll, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Methods inherited from interface java.util.Collection

equals, hashCode, parallelStream, removeIf, spliterator, stream

Constructor Detail

QueryCursorWrapper

public QueryCursorWrapper(QueryCursor<T> delegate,
                          Function<T,V> transformer)

Instantiates a new Query cursor wrapper.

Parameters:

delegate - delegate QueryCursor with T input elements

transformer - Function to transform T to V elements

Method Detail

iterator

public Iterator<V> iterator()

Specified by:

iterator in interface Iterable<V>

Specified by:

iterator in interface Collection<V>

Specified by:

iterator in class AbstractCollection<V>

close

public void close()

Closes all resources related to this cursor. If the query execution is in progress (which is possible in case of invoking from another thread), a cancel will be attempted. Sequential calls to this method have no effect.

Note: don't forget to close query cursors. Not doing so may lead to various resource leaks.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface QueryCursor<V>

getAll

public List<V> getAll()

Gets all query results and stores them in the collection. Use this method when you know in advance that query result is relatively small and will not cause memory utilization issues.

Since all the results will be fetched, all the resources will be closed automatically after this call, e.g. there is no need to call QueryCursor.close() method in this case.

Specified by:

getAll in interface QueryCursor<V>

Returns:

List containing all query results.

size

public int size()

Specified by:

size in interface Collection<V>

Specified by:

size in class AbstractCollection<V>