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

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

All Implemented Interfaces:

Adaptor

public class FileAdaptor
extends AbstractAdaptor

File Adaptor push small size file in one chunk to collector

Field Summary

protected long	fileReadOffset
protected boolean	finished
protected RandomAccessFile	reader
protected boolean	shutdownCalled

Fields inherited from class org.apache.hadoop.chukwa.datacollection.adaptor.AbstractAdaptor

adaptorID, control, dest, 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 or byte offset, which are written by caller.
void	hardStop() Deprecated.
String	parseArgs(String params) Parse args, return stream name.
long	shutdown() Deprecated.
long	shutdown(AdaptorShutdownPolicy shutdownPolicy) Signals this adaptor to come to an orderly stop.
void	start(long bytes)

Methods inherited from class org.apache.hadoop.chukwa.datacollection.adaptor.AbstractAdaptor

deregisterAndStop, getType, start

Methods inherited from class java.lang.Object

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

Field Detail

finished

protected volatile boolean finished

reader

protected RandomAccessFile reader

fileReadOffset

protected long fileReadOffset

shutdownCalled

protected boolean shutdownCalled

Constructor Detail

FileAdaptor

public FileAdaptor()

Method Detail

start

public void start(long bytes)

Specified by:

start in class AbstractAdaptor

shutdown

@Deprecated
public long shutdown()
              throws AdaptorException

Deprecated.

We want to keep trying

Returns:

the logical offset at which the adaptor stops

Throws:

AdaptorException

See Also:

Adaptor.shutdown()

hardStop

@Deprecated
public void hardStop()
              throws AdaptorException

Deprecated.

Stop tailing the file, effective immediately.

Throws:

AdaptorException

shutdown

public long shutdown(AdaptorShutdownPolicy shutdownPolicy)

Description copied from interface: Adaptor

Signals this adaptor to come to an orderly stop. The adaptor ought to push out all the data it can before exiting depending of the shutdown policy

Returns:

the logical offset at which the adaptor was when the method return

parseArgs

public String parseArgs(String params)

Description copied from interface: Adaptor

Parse args, return stream name. Do not start running. Return the stream name, given params. The stream name is the part of the Adaptor status that's used to determine uniqueness.

Returns:

Stream name as a string, null if params are malformed

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

getCurrentStatus

public String getCurrentStatus()

Description copied from interface: Adaptor

Return the adaptor's state Should not include class name or byte offset, which are written by caller. The datatype should, however, be written by this method.

Returns:

the adaptor state as a string