com.netflix.loadbalancer

Class LoadBalancerStats

java.lang.Object

com.netflix.loadbalancer.LoadBalancerStats

public class LoadBalancerStats
extends java.lang.Object

Class that acts as a repository of operational charateristics and statistics of every Node/Server in the LaodBalancer. This information can be used to just observe and understand the runtime behavior of the loadbalancer or more importantly for the basis that determines the loadbalacing strategy

Constructor Summary

Constructors

Constructor and Description
LoadBalancerStats(java.lang.String name)

Method Summary

Methods

Modifier and Type	Method and Description
void	addServer(Server server)
void	clearSuccessiveConnectionFailureCount(Server server)
void	decrementActiveRequestsCount(Server server)
int	getActiveRequestsCount(java.lang.String zone)
double	getActiveRequestsPerServer(java.lang.String zone)
java.util.Set<java.lang.String>	getAvailableZones()
int	getCircuitBreakerTrippedCount()
int	getCircuitBreakerTrippedCount(java.lang.String zone)
int	getCongestionRatePercentage(java.lang.String zone)
int	getInstanceCount(java.lang.String zone)
long	getMeasuredZoneHits(java.lang.String zone)
java.lang.String	getName()
java.util.Map<Server,ServerStats>	getServerStats() returns map of Stats for all servers
ServerStats	getSingleServerStat(Server server)
ZoneSnapshot	getZoneSnapshot(java.util.List<? extends Server> servers) This is the core function to get zone stats.
ZoneSnapshot	getZoneSnapshot(java.lang.String zone)
java.util.Map<java.lang.String,ZoneStats>	getZoneStats()
void	incrementActiveRequestsCount(Server server)
void	incrementNumRequests(Server server)
void	incrementSuccessiveConnectionFailureCount(Server server)
void	incrementZoneCounter(Server server)
boolean	isCircuitBreakerTripped(Server server)
void	noteResponseTime(Server server, double msecs) Method that updates the internal stats of Response times maintained on a per Server basis
void	setName(java.lang.String name)
java.lang.String	toString()
void	updateServerList(java.util.List<Server> servers) The caller o this class is tasked to call this method every so often if the servers participating in the LoadBalancer changes
void	updateZoneServerMapping(java.util.Map<java.lang.String,java.util.List<Server>> map)

Methods inherited from class java.lang.Object

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

Constructor Detail

LoadBalancerStats

public LoadBalancerStats(java.lang.String name)

Method Detail

getName

public java.lang.String getName()

setName

public void setName(java.lang.String name)

updateServerList

public void updateServerList(java.util.List<Server> servers)

The caller o this class is tasked to call this method every so often if the servers participating in the LoadBalancer changes

Parameters:

servers -

addServer

public void addServer(Server server)

noteResponseTime

public void noteResponseTime(Server server,
                    double msecs)

Method that updates the internal stats of Response times maintained on a per Server basis

Parameters:

server -

msecs -

incrementActiveRequestsCount

public void incrementActiveRequestsCount(Server server)

decrementActiveRequestsCount

public void decrementActiveRequestsCount(Server server)

isCircuitBreakerTripped

public boolean isCircuitBreakerTripped(Server server)

incrementSuccessiveConnectionFailureCount

public void incrementSuccessiveConnectionFailureCount(Server server)

clearSuccessiveConnectionFailureCount

public void clearSuccessiveConnectionFailureCount(Server server)

incrementNumRequests

public void incrementNumRequests(Server server)

incrementZoneCounter

public void incrementZoneCounter(Server server)

updateZoneServerMapping

public void updateZoneServerMapping(java.util.Map<java.lang.String,java.util.List<Server>> map)

getInstanceCount

public int getInstanceCount(java.lang.String zone)

getActiveRequestsCount

public int getActiveRequestsCount(java.lang.String zone)

getActiveRequestsPerServer

public double getActiveRequestsPerServer(java.lang.String zone)

getZoneSnapshot

public ZoneSnapshot getZoneSnapshot(java.lang.String zone)

getZoneSnapshot

public ZoneSnapshot getZoneSnapshot(java.util.List<? extends Server> servers)

This is the core function to get zone stats. All stats are reported to avoid going over the list again for a different stat.

Parameters:

servers -

getCircuitBreakerTrippedCount

public int getCircuitBreakerTrippedCount(java.lang.String zone)

getCircuitBreakerTrippedCount

@Monitor(name="LBStats_CircuitBreakerTrippedCount",
         type=GAUGE)
public int getCircuitBreakerTrippedCount()

getMeasuredZoneHits

public long getMeasuredZoneHits(java.lang.String zone)

getCongestionRatePercentage

public int getCongestionRatePercentage(java.lang.String zone)

getAvailableZones

@Monitor(name="LBStats_AvailableZones",
         type=INFORMATIONAL)
public java.util.Set<java.lang.String> getAvailableZones()

getSingleServerStat

public ServerStats getSingleServerStat(Server server)

getServerStats

public java.util.Map<Server,ServerStats> getServerStats()

returns map of Stats for all servers

getZoneStats

public java.util.Map<java.lang.String,ZoneStats> getZoneStats()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object