Package org.apache.druid.frame.processor

Class FileOutputChannelFactory

java.lang.Object

org.apache.druid.frame.processor.FileOutputChannelFactory

All Implemented Interfaces:

OutputChannelFactory

public class FileOutputChannelFactory
extends Object
implements OutputChannelFactory

An OutputChannelFactory that generates WritableFrameFileChannel backed by FrameFileWriter.

Constructor Summary

Constructors

Constructor	Description
FileOutputChannelFactory(File fileChannelsDirectory, int frameSize, ByteTracker byteTracker, WireTransferableContext wireTransferableContext)

Method Summary

Modifier and Type	Method	Description
boolean	isBuffered()	Whether this factory creates buffered channels.
OutputChannel	openChannel(int partitionNumber)	Create a channel pair tagged with a particular partition number.
OutputChannel	openNilChannel(int partitionNumber)	Create a non-writable, always-empty channel pair tagged with a particular partition number.
PartitionedOutputChannel	openPartitionedChannel(String name, boolean deleteAfterRead)	Create a channel pair tagged with a particular name and a flag to delete the channel data after its read.

Methods inherited from class java.lang.Object

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

Constructor Details

FileOutputChannelFactory

public FileOutputChannelFactory(File fileChannelsDirectory,
 int frameSize,
 @Nullable
 ByteTracker byteTracker,
 WireTransferableContext wireTransferableContext)

Method Details

openChannel

public OutputChannel openChannel(int partitionNumber)
                          throws IOException

Description copied from interface: OutputChannelFactory

Create a channel pair tagged with a particular partition number.

Specified by:

openChannel in interface OutputChannelFactory

Throws:

IOException

openPartitionedChannel

public PartitionedOutputChannel openPartitionedChannel(String name,
 boolean deleteAfterRead)
                                                throws IOException

Description copied from interface: OutputChannelFactory

Create a channel pair tagged with a particular name and a flag to delete the channel data after its read.

Specified by:

openPartitionedChannel in interface OutputChannelFactory

Throws:

IOException

openNilChannel

public OutputChannel openNilChannel(int partitionNumber)

Description copied from interface: OutputChannelFactory

Create a non-writable, always-empty channel pair tagged with a particular partition number. Calling OutputChannel.getWritableChannel() on this nil channel pair will result in an error. Calling OutputChannel.getReadableChannel() will return an empty channel.

Specified by:

openNilChannel in interface OutputChannelFactory

isBuffered

public boolean isBuffered()

Description copied from interface: OutputChannelFactory

Whether this factory creates buffered channels. Buffered channel readers (from OutputChannel.getReadableChannel()) will not work properly until the writer is closed. Unbuffered readers work immediately, even while the writer is open.

Specified by:

isBuffered in interface OutputChannelFactory