Package org.apache.ignite.internal.processors.cache.query.reducer

Class UnsortedCacheQueryReducer<R>

java.lang.Object

org.apache.ignite.internal.util.lang.GridIteratorAdapter<T>

org.apache.ignite.internal.processors.cache.query.reducer.CacheQueryReducer<R>

org.apache.ignite.internal.processors.cache.query.reducer.UnsortedCacheQueryReducer<R>

All Implemented Interfaces:

Serializable, Iterable<R>, Iterator<R>, GridSerializableIterator<R>, GridIterator<R>

public class UnsortedCacheQueryReducer<R>
extends CacheQueryReducer<R>

Reducer of cache query results, no ordering of results is provided.

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.ignite.internal.processors.cache.query.reducer.CacheQueryReducer

pageStreams

Constructor Summary

Constructors

Constructor	Description
UnsortedCacheQueryReducer(Map<UUID,NodePageStream<R>> pageStreams)

Method Summary

Modifier and Type	Method	Description
boolean	hasNextX()	This method is the same as Iterator.hasNext(), but allows for failure with exception.
R	nextX()	This method is the same as Iterator.next(), but allows for failure with exception.

Methods inherited from class org.apache.ignite.internal.processors.cache.query.reducer.CacheQueryReducer

get, removeX

Methods inherited from class org.apache.ignite.internal.util.lang.GridIteratorAdapter

hasNext, iterator, next, remove

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Methods inherited from interface java.util.Iterator

forEachRemaining

Constructor Detail

UnsortedCacheQueryReducer

public UnsortedCacheQueryReducer(Map<UUID,NodePageStream<R>> pageStreams)

Method Detail

hasNextX

public boolean hasNextX()
                 throws IgniteCheckedException

This method is the same as Iterator.hasNext(), but allows for failure with exception. Often iterators are used to iterate through values that have not or have partially been received from remote nodes, and need to account for possible network failures, rather than just returning false out of Iterator.hasNext() method.

Returns:

True if iterator contains more elements.

Throws:

IgniteCheckedException - If no more elements can be returned due to some failure, like a network error for example.

See Also:

Iterator.hasNext()

nextX

public R nextX()
        throws IgniteCheckedException

This method is the same as Iterator.next(), but allows for failure with exception. Often iterators are used to iterate through values that have not or have partially been received from remote nodes, and need to account for possible network failures, rather than throwing NoSuchElementException runtime exception.s

Returns:

True if iterator contains more elements.

Throws:

IgniteCheckedException - If no more elements can be returned due to some failure, like a network error for example.

See Also:

Iterator.next()