com.sleepycat.je.rep.stream

Class MasterStatus

java.lang.Object

com.sleepycat.je.rep.stream.MasterStatus

All Implemented Interfaces:

Cloneable

public class MasterStatus
extends Object
implements Cloneable

Class used by a node to track changes in Master Status. It's updated by the Listener. It represents the abstract notion that the notion of the current Replica Group is definitive and is always in advance of the notion of a master at each node. A node is typically playing catch up as it tries to bring its view in line with that of the group.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	MasterStatus.MasterSyncException

Constructor Summary

Constructors

Constructor and Description
MasterStatus(NameIdPair nameIdPair)

Method Summary

Modifier and Type	Method and Description
void	assertSync() An assertion form of the above.
Object	clone() Returns a read-only snapshot of the object.
InetSocketAddress	getGroupMaster() Returns a socket that can be used to communicate with the group master.
NameIdPair	getGroupMasterNameId()
InetSocketAddress	getNodeMaster() Returns the Node's current idea of the Master.
NameIdPair	getNodeMasterNameId()
boolean	inSync() Predicate to determine whether the group and node have a consistent notion of the Master.
boolean	isGroupMaster() Returns true if it's the master from the Group's perspective
boolean	isNodeMaster() Returns true if it's the master from the node's localized perspective
void	setGroupMaster(String hostname, int port, NameIdPair newGroupMasterNameId)
void	sync() Syncs to the group master
void	unSync()

Methods inherited from class java.lang.Object

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

Constructor Detail

MasterStatus

public MasterStatus(NameIdPair nameIdPair)

Method Detail

clone

public Object clone()

Returns a read-only snapshot of the object.

Overrides:

clone in class Object

isGroupMaster

public boolean isGroupMaster()

Returns true if it's the master from the Group's perspective

isNodeMaster

public boolean isNodeMaster()

Returns true if it's the master from the node's localized perspective

setGroupMaster

public void setGroupMaster(String hostname,
                           int port,
                           NameIdPair newGroupMasterNameId)

inSync

public boolean inSync()

Predicate to determine whether the group and node have a consistent notion of the Master.

Returns:

false if the node does not know of a Master, or the group Master is different from the node's notion the master.

unSync

public void unSync()

assertSync

public void assertSync()
                throws MasterStatus.MasterSyncException

An assertion form of the above. By combining the check and exception generation in an atomic operation, it provides for an accurate exception message.

Throws:

MasterStatus.MasterSyncException

sync

public void sync()

Syncs to the group master

getNodeMaster

public InetSocketAddress getNodeMaster()

Returns the Node's current idea of the Master. It may be "out of sync" with the Group's notion of the Master

getNodeMasterNameId

public NameIdPair getNodeMasterNameId()

getGroupMaster

public InetSocketAddress getGroupMaster()

Returns a socket that can be used to communicate with the group master. It can return null, if there is no current group master, that is, groupMasterNameId is NULL.

getGroupMasterNameId

public NameIdPair getGroupMasterNameId()