Package com.yahoo.search.cluster

Class TrafficNodeMonitor<T>

java.lang.Object

com.yahoo.search.cluster.BaseNodeMonitor<T>

com.yahoo.search.cluster.TrafficNodeMonitor<T>

public class TrafficNodeMonitor<T>
extends BaseNodeMonitor<T>

This node monitor is responsible for maintaining the state of a monitored node. It has the following properties:

• A node is taken out of operation if it gives no response in 10 s
• A node is put back in operation when it responds correctly again

Author:

Steinar Knutsen

Field Summary

Fields inherited from class com.yahoo.search.cluster.BaseNodeMonitor

configuration, failedAt, isQuarantined, isWorking, log, node, respondedAt, succeededAt

Constructor Summary

Constructors

Constructor	Description
TrafficNodeMonitor(T node, MonitorConfiguration configuration, boolean internal)	Creates a new node monitor for a node

Method Summary

Modifier and Type	Method	Description
void	failed(ErrorMessage error)	Called when this node fails.
T	getNode()
Boolean	isKnownWorking()	Returns whether this node is currently is a state suitable for receiving traffic, or null if not known
void	responded()	Called when a response is received from this node.
protected void	setWorking(boolean working, String explanation)	Thread-safely changes the state of this node if required

Methods inherited from class com.yahoo.search.cluster.BaseNodeMonitor

isInternal, isWorking, now

Methods inherited from class java.lang.Object

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

Constructor Details

TrafficNodeMonitor

public TrafficNodeMonitor(T node,
 MonitorConfiguration configuration,
 boolean internal)

Creates a new node monitor for a node

Method Details

getNode

public T getNode()

Overrides:

getNode in class BaseNodeMonitor<T>

failed

public void failed(ErrorMessage error)

Called when this node fails.

Specified by:

failed in class BaseNodeMonitor<T>

Parameters:

error - a container which should contain a short description

responded

public void responded()

Called when a response is received from this node.

Specified by:

responded in class BaseNodeMonitor<T>

isKnownWorking

public Boolean isKnownWorking()

Returns whether this node is currently is a state suitable for receiving traffic, or null if not known

setWorking

protected void setWorking(boolean working,
 String explanation)

Thread-safely changes the state of this node if required

Specified by:

setWorking in class BaseNodeMonitor<T>