org.apache.druid.frame.processor

Class OutputChannels

java.lang.Object

org.apache.druid.frame.processor.OutputChannels

public class OutputChannels
extends Object

A list of OutputChannel. The advantage of this class over List<OutputChannel> is that it has extra convenience methods like getChannelsForPartition(int) and readOnly().

Method Summary

Modifier and Type	Method and Description
List<OutputChannel>	getAllChannels() Returns all channels.
List<OutputChannel>	getChannelsForPartition(int partitionNumber) Returns channels for which OutputChannel.getPartitionNumber() returns partitionNumber.
it.unimi.dsi.fastutil.ints.IntSortedSet	getPartitionNumbers() Returns the set of partition numbers that appear across all channels.
static OutputChannels	none()
OutputChannels	readOnly() Returns a read-only version of this instance.
static OutputChannels	wrap(List<OutputChannel> outputChannels) Creates an instance wrapping all the provided channels.
static OutputChannels	wrapReadOnly(List<OutputChannel> outputChannels) Creates an instance wrapping read-only versions (see OutputChannel.readOnly()) of all the provided channels.

Methods inherited from class java.lang.Object

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

Method Detail

none

public static OutputChannels none()

wrap

public static OutputChannels wrap(List<OutputChannel> outputChannels)

Creates an instance wrapping all the provided channels.

wrapReadOnly

public static OutputChannels wrapReadOnly(List<OutputChannel> outputChannels)

Creates an instance wrapping read-only versions (see OutputChannel.readOnly()) of all the provided channels.

getPartitionNumbers

public it.unimi.dsi.fastutil.ints.IntSortedSet getPartitionNumbers()

Returns the set of partition numbers that appear across all channels.

getAllChannels

public List<OutputChannel> getAllChannels()

Returns all channels.

getChannelsForPartition

public List<OutputChannel> getChannelsForPartition(int partitionNumber)

Returns channels for which OutputChannel.getPartitionNumber() returns partitionNumber.

readOnly

public OutputChannels readOnly()

Returns a read-only version of this instance. Each individual output channel is replaced with its read-only version (OutputChannel.readOnly(), which reduces memory usage.