Package com.arpnetworking.metrics.common.tailer

Class StatefulTailer

java.lang.Object

com.arpnetworking.metrics.common.tailer.StatefulTailer

All Implemented Interfaces:

Tailer, Runnable

public final class StatefulTailer
extends Object
implements Tailer

A reimplementation of the Apache Commons IO tailer based on the 2.5 snapshot version. This version attempts to address several shortcomings of the Apache Commons implementation. In particular, more robust support for rename- recreate file rotations and some progress for copy-truncate cases. The major new feature is the PositionStore which is used to checkpoint the offset in the tailed file as identified by a hash of the file prefix.

Author:

Brandon Arp (brandon dot arp at inscopemetrics dot io), Ville Koskela (ville dot koskela at inscopemetrics dot io)

Nested Class Summary

Nested Classes

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

Method Summary

Modifier and Type	Method	Description
protected boolean	isRunning()	Determine if the Tailer is running.
void	run()
void	stop()	Stop the Tailer instance.
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

stop

public void stop()

Description copied from interface: Tailer

Stop the Tailer instance.

Specified by:

stop in interface Tailer

run

public void run()

Specified by:

run in interface Runnable

toLogValue

public Object toLogValue()

Generate a Steno log compatible representation.

Returns:

Steno log compatible representation.

toString

public String toString()

Overrides:

toString in class Object

isRunning

protected boolean isRunning()

Determine if the Tailer is running.

Returns:

True if and only if the Tailer is running.