Package me.ahoo.cosid.machine

Class InstanceId

java.lang.Object

me.ahoo.cosid.machine.InstanceId

@Immutable
public class InstanceId
extends Object

Represents a specific deployment instance of a service.

An InstanceId identifies a particular running instance of a service, which may be part of a deployment that provides stable machine IDs (stable=true) or a dynamic instance where machine IDs may change (stable=false).

See Also:

• MachineId

Field Summary

Fields

Modifier and Type	Field	Description
static final InstanceId	NONE	Sentinel value representing no instance.

Constructor Summary

Constructors

Constructor	Description
InstanceId(String instanceId, boolean stable)	Creates a new InstanceId.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
String	getInstanceId()	Gets the instance identifier string.
int	hashCode()
boolean	isStable()	Checks if this instance has a stable identity.
static InstanceId	of(String instanceId, boolean stable)	Creates an InstanceId from an instance ID string.
static InstanceId	of(String host, int port, boolean stable)	Creates an InstanceId from host and port.
String	toString()

Methods inherited from class java.lang.Object

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

Field Details

NONE

public static final InstanceId NONE

Sentinel value representing no instance.

Constructor Details

InstanceId

public InstanceId(String instanceId,
 boolean stable)

Creates a new InstanceId.

Parameters:

instanceId - the instance identifier string

stable - whether this instance has a stable identity

Method Details

isStable

public boolean isStable()

Checks if this instance has a stable identity.

Stable instances (stable=true) are deployed with stable identities (e.g., Kubernetes StatefulSet) and can rely on having consistent machine IDs across restarts.

Returns:

true if the instance has a stable identity

getInstanceId

public String getInstanceId()

Gets the instance identifier string.

Returns:

the instance ID

toString

public String toString()

Overrides:

toString in class Object

of

public static InstanceId of(String host,
 int port,
 boolean stable)

Creates an InstanceId from host and port.

Parameters:

host - the host address

port - the port number

stable - whether this instance has a stable identity

Returns:

a new InstanceId

of

public static InstanceId of(String instanceId,
 boolean stable)

Creates an InstanceId from an instance ID string.

Parameters:

instanceId - the instance identifier

stable - whether this instance has a stable identity

Returns:

a new InstanceId

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object