io.druid.segment.realtime.firehose

Class CombiningFirehoseFactory

java.lang.Object

io.druid.segment.realtime.firehose.CombiningFirehoseFactory

All Implemented Interfaces:

FirehoseFactory<InputRowParser>

public class CombiningFirehoseFactory
extends Object
implements FirehoseFactory<InputRowParser>

Creates firehose that combines data from different Firehoses. Useful for ingesting data from multiple sources.

Constructor Summary

Constructors

Constructor and Description
CombiningFirehoseFactory(List<FirehoseFactory> delegateFactoryList)

Method Summary

Modifier and Type	Method and Description
Firehose	connect(InputRowParser parser, File temporaryDirectory) Initialization method that connects up the fire hose.
List<FirehoseFactory>	getDelegateFactoryList()

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.druid.data.input.FirehoseFactory

connect

Constructor Detail

CombiningFirehoseFactory

public CombiningFirehoseFactory(List<FirehoseFactory> delegateFactoryList)

Method Detail

connect

public Firehose connect(InputRowParser parser,
                        File temporaryDirectory)
                 throws IOException

Description copied from interface: FirehoseFactory

Initialization method that connects up the fire hose. If this method returns successfully it should be safe to call hasMore() on the returned Firehose (which might subsequently block).

If this method returns null, then any attempt to call hasMore(), nextRow(), commit() and close() on the return value will throw a surprising NPE. Throwing IOException on connection failure or runtime exception on invalid configuration is preferred over returning null.

Some fire hoses like PrefetchableTextFilesFirehoseFactory may use a temporary directory to cache data in it.

Specified by:

connect in interface FirehoseFactory<InputRowParser>

Parameters:

parser - an input row parser

temporaryDirectory - a directory where temporary files are stored

Throws:

IOException

getDelegateFactoryList

public List<FirehoseFactory> getDelegateFactoryList()