com.netflix.turbine.discovery

Class Instance

java.lang.Object

com.netflix.turbine.discovery.Instance

All Implemented Interfaces:

java.lang.Comparable<Instance>

public class Instance
extends java.lang.Object
implements java.lang.Comparable<Instance>

Class that encapsulates a host or machine that is vending data to Turbine.

Turbine uses the notion of cluster to group Instances together for agggregation.

Turbine also treats the host status as a first class citizen where the status conveys whether the host is ready to serve data etc.

• isUp = true means that Turbine must connect to the host
• isUp = false indicates that Turbine should either not connect or disconnect if it is already connected.

Once Turbine disconnects, all the relevant data from that host is purged from it's aggregated state.

You can also use the attrs to add in free form details about an Instance. e.g ec2-availability-zone, build revision etc.

Then you can also write your own ObservationCriteria implementation to decide how to filter out relevant hosts to aggregate data from.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Instance.UnitTest

Constructor Summary

Constructors

Constructor and Description
Instance(java.lang.String host, java.lang.String clusterName, boolean status)

Method Summary

Methods

Modifier and Type	Method and Description
int	compareTo(Instance other)
boolean	equals(java.lang.Object obj)
java.util.Map<java.lang.String,java.lang.String>	getAttributes()
java.lang.String	getCluster()
java.lang.String	getHostname()
int	hashCode()
boolean	isUp()
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Instance

public Instance(java.lang.String host,
        java.lang.String clusterName,
        boolean status)

Parameters:

host -

clusterName -

status -

Method Detail

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getHostname

public java.lang.String getHostname()

Returns:

String

getCluster

public java.lang.String getCluster()

Returns:

String

isUp

public boolean isUp()

Returns:

true/false

getAttributes

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

Returns:

Map

compareTo

public int compareTo(Instance other)

Specified by:

compareTo in interface java.lang.Comparable<Instance>