org.apache.druid.frame.processor

Interface OutputChannelFactory

All Known Implementing Classes:

BlockingQueueOutputChannelFactory, FileOutputChannelFactory

public interface OutputChannelFactory

Factory for generating channel pairs for output data from processors.

Method Summary

Modifier and Type	Method and Description
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.

Method Detail

openChannel

OutputChannel openChannel(int partitionNumber)
                   throws IOException

Create a channel pair tagged with a particular partition number.

Throws:

IOException

openNilChannel

OutputChannel openNilChannel(int partitionNumber)

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.