OutputChannels (druid-processing 28.0.0 API)

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

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`areReadableChannelsReady()`
`List<OutputChannel>`	`getAllChannels()`	Returns all channels.
`List<ReadableFrameChannel>`	`getAllReadableChannels()`	Returns all channels, as readable 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.
  - getAllReadableChannels
```
public List<ReadableFrameChannel> getAllReadableChannels()
```
    Returns all channels, as readable 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.
  - areReadableChannelsReady
```
public boolean areReadableChannelsReady()
```