org.apache.hadoop.chukwa.datacollection.adaptor
Class FileAdaptor

java.lang.Object
  org.apache.hadoop.chukwa.datacollection.adaptor.FileAdaptor

All Implemented Interfaces:

Adaptor

public class FileAdaptor
extends Object
implements Adaptor

File Adaptor push small size file in one chunk to collector

Field Summary

protected long	adaptorID
protected ChunkReceiver	dest
protected long	fileReadOffset
protected RandomAccessFile	reader
protected boolean	shutdownCalled
protected File	toWatch
protected String	type

Constructor Summary

FileAdaptor()

Method Summary

protected int	extractRecords(ChunkReceiver eq, long buffOffsetInFile, byte[] buf, long fileTime) Extract records from a byte sequence
String	getCurrentStatus() Return the adaptor's state Should not include class name, datatype or byte offset, which are written by caller.
String	getStreamName() Return the stream name
String	getType()
void	hardStop() Stop tailing the file, effective immediately.
long	shutdown() We want to keep trying
void	start(long adaptorID, String type, String params, long bytes, ChunkReceiver dest) Start this adaptor

Methods inherited from class java.lang.Object

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

Field Detail

toWatch

protected File toWatch

reader

protected RandomAccessFile reader

fileReadOffset

protected long fileReadOffset

type

protected String type

dest

protected ChunkReceiver dest

adaptorID

protected long adaptorID

shutdownCalled

protected boolean shutdownCalled

Constructor Detail

FileAdaptor

public FileAdaptor()

Method Detail

start

public void start(long adaptorID,
                  String type,
                  String params,
                  long bytes,
                  ChunkReceiver dest)

Description copied from interface: Adaptor

Start this adaptor

Specified by:

start in interface Adaptor

type - the application type, who is starting this adaptor

params - the status string to use for configuration.

bytes - the stream offset of the first byte sent by this adaptor

shutdown

public long shutdown()
              throws AdaptorException

We want to keep trying

Specified by:

shutdown in interface Adaptor

Returns:

the logical offset at which the adaptor stops

Throws:

AdaptorException

See Also:

Adaptor.shutdown()

hardStop

public void hardStop()
              throws AdaptorException

Stop tailing the file, effective immediately.

Specified by:

hardStop in interface Adaptor

Throws:

AdaptorException

getStreamName

public String getStreamName()

Description copied from interface: Adaptor

Return the stream name

Specified by:

getStreamName in interface Adaptor

Returns:

Stream name as a string

extractRecords

protected int extractRecords(ChunkReceiver eq,
                             long buffOffsetInFile,
                             byte[] buf,
                             long fileTime)
                      throws InterruptedException

Extract records from a byte sequence

Parameters:

eq - the queue to stick the new chunk[s] in

buffOffsetInFile - the byte offset in the stream at which buf[] begins

buf - the byte buffer to extract records from

Returns:

the number of bytes processed

Throws:

InterruptedException

getType

public String getType()

Specified by:

getType in interface Adaptor

getCurrentStatus

public String getCurrentStatus()
                        throws AdaptorException

Description copied from interface: Adaptor

Return the adaptor's state Should not include class name, datatype or byte offset, which are written by caller.

Specified by:

getCurrentStatus in interface Adaptor

Returns:

the adaptor state as a string

Throws:

AdaptorException