org.apache.flume.source

Class PollableSourceRunner

java.lang.Object

org.apache.flume.SourceRunner

org.apache.flume.source.PollableSourceRunner

All Implemented Interfaces:

LifecycleAware

public class PollableSourceRunner
extends SourceRunner

An implementation of SourceRunner that can drive a PollableSource.

A PollableSourceRunner wraps a PollableSource in the required run loop in order for it to operate. Internally, metrics and counters are kept such that a source that returns a PollableSource.Status of BACKOFF causes the run loop to do exactly that. There's a maximum backoff period of 500ms. A source that returns READY is immediately invoked. Note that BACKOFF is merely a hint to the runner; it need not be strictly adhered to.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	PollableSourceRunner.PollingRunner

Constructor Summary

Constructors

Constructor and Description
PollableSourceRunner()

Method Summary

Modifier and Type	Method and Description
LifecycleState	getLifecycleState() Return the current state of the service or component.
void	start() Starts a service or component.
void	stop() Stops a service or component.
String	toString()

Methods inherited from class org.apache.flume.SourceRunner

forSource, getSource, setSource

Methods inherited from class java.lang.Object

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

Constructor Detail

PollableSourceRunner

public PollableSourceRunner()

Method Detail

start

public void start()

Description copied from interface: LifecycleAware

Starts a service or component.

Implementations should determine the result of any start logic and effect the return value of LifecycleAware.getLifecycleState() accordingly.

stop

public void stop()

Description copied from interface: LifecycleAware

Stops a service or component.

Implementations should determine the result of any stop logic and effect the return value of LifecycleAware.getLifecycleState() accordingly.

toString

public String toString()

Overrides:

toString in class Object

getLifecycleState

public LifecycleState getLifecycleState()

Description copied from interface: LifecycleAware

Return the current state of the service or component.