Package com.arpnetworking.metrics.common.tailer

Class FilePositionStore

java.lang.Object

com.arpnetworking.metrics.common.tailer.FilePositionStore

All Implemented Interfaces:

PositionStore, Closeable, AutoCloseable

public final class FilePositionStore
extends Object
implements PositionStore

Implementation of PositionStore which stores the read position in a file on local disk. This class is thread-safe per file identifier.

Author:

Ville Koskela (ville dot koskela at inscopemetrics dot io)

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	FilePositionStore.Builder	Builder implementation for FilePositionStore.

Method Summary

Modifier and Type	Method	Description
void	close()
Optional<Long>	getPosition(String identifier)	Get the read location in the file identified by a hash.
void	setPosition(String identifier, long position)	Update the read offset from the beginning of the file for the specified file identifier.
Object	toLogValue()	Generate a Steno log compatible representation.
String	toString()

Methods inherited from class java.lang.Object

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

Method Details

getPosition

public Optional<Long> getPosition(String identifier)

Description copied from interface: PositionStore

Get the read location in the file identified by a hash.

Specified by:

getPosition in interface PositionStore

Parameters:

identifier - unique identifier for the file.

Returns:

Optional.absent if the file was not found, otherwise a byte offset

setPosition

public void setPosition(String identifier,
 long position)

Description copied from interface: PositionStore

Update the read offset from the beginning of the file for the specified file identifier.

Specified by:

setPosition in interface PositionStore

Parameters:

identifier - unique identifier for the file.

position - the new read offset from the beginning of the file in bytes.

close

public void close()

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

toLogValue

public Object toLogValue()

Generate a Steno log compatible representation.

Returns:

Steno log compatible representation.

toString

public String toString()

Overrides:

toString in class Object