org.apache.cassandra.db.partitions

Class PartitionIterators

java.lang.Object

org.apache.cassandra.db.partitions.PartitionIterators

public abstract class PartitionIterators
extends java.lang.Object

Method Summary

Modifier and Type	Method and Description
static PartitionIterator	concat(java.util.List<PartitionIterator> iterators)
static void	consume(PartitionIterator iterator)
static void	consumeNext(PartitionIterator iterator) Consumes all rows in the next partition of the provided partition iterator.
static PartitionIterator	doOnClose(PartitionIterator delegate, java.lang.Runnable action) Wraps the provided iterator to run a specified action on close.
static RowIterator	getOnlyElement(PartitionIterator iter, SinglePartitionReadQuery query)
static PartitionIterator	loggingIterator(PartitionIterator iterator, java.lang.String id) Wraps the provided iterator so it logs the returned rows for debugging purposes.
static PartitionIterator	singletonIterator(RowIterator iterator)

Methods inherited from class java.lang.Object

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

Method Detail

getOnlyElement

public static RowIterator getOnlyElement(PartitionIterator iter,
                                         SinglePartitionReadQuery query)

concat

public static PartitionIterator concat(java.util.List<PartitionIterator> iterators)

singletonIterator

public static PartitionIterator singletonIterator(RowIterator iterator)

consume

public static void consume(PartitionIterator iterator)

consumeNext

public static void consumeNext(PartitionIterator iterator)

Consumes all rows in the next partition of the provided partition iterator.

loggingIterator

public static PartitionIterator loggingIterator(PartitionIterator iterator,
                                                java.lang.String id)

Wraps the provided iterator so it logs the returned rows for debugging purposes.

Note that this is only meant for debugging as this can log a very large amount of logging at INFO.

doOnClose

public static PartitionIterator doOnClose(PartitionIterator delegate,
                                          java.lang.Runnable action)

Wraps the provided iterator to run a specified action on close. Note that the action will be run even if closure of the provided iterator throws an exception.