io.fabric8.groups

Interface Group<T extends NodeState>

All Superinterfaces:

java.lang.AutoCloseable, java.io.Closeable

All Known Subinterfaces:

MultiGroup<T>

All Known Implementing Classes:

DelegateZooKeeperGroup, DelegateZooKeeperMultiGroup, TrackingZooKeeperGroup, ZooKeeperGroup, ZooKeeperMultiGroup

public interface Group<T extends NodeState>
extends java.io.Closeable

Method Summary

Methods

Modifier and Type	Method and Description
void	add(GroupListener<T> listener) Registers a listener which will be called when the cluster membership changes or the group is connected or disconnected.
void	close() A member should be closed to release acquired resources used to monitor the group membership.
boolean	isConnected() Are we connected with the cluster?
boolean	isMaster() Check if we are the master.
T	master() Retrieve the master node.
java.util.Map<java.lang.String,T>	members() Get the list of members connected to this group.
void	remove(GroupListener<T> listener) Removes a previously added listener.
java.util.List<T>	slaves() Retrieve the list of slaves.
void	start() Start this member
void	update(T state) Update the state of this group member.

Method Detail

isConnected

boolean isConnected()

Are we connected with the cluster?

start

void start()

Start this member

close

void close()
           throws java.io.IOException

A member should be closed to release acquired resources used to monitor the group membership. When the member is closed, any memberships registered via this Group will be removed from the group.

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable

Throws:

java.io.IOException

add

void add(GroupListener<T> listener)

Registers a listener which will be called when the cluster membership changes or the group is connected or disconnected.

remove

void remove(GroupListener<T> listener)

Removes a previously added listener.

update

void update(T state)

Update the state of this group member. If the state is null, the member will leave the group. This method can be called even if the group is not started, in which case the state will be stored and updated when the group becomes started.

Parameters:

state - the new state of this group member

members

java.util.Map<java.lang.String,T> members()

Get the list of members connected to this group.

isMaster

boolean isMaster()

Check if we are the master.

master

T master()

Retrieve the master node.

slaves

java.util.List<T> slaves()

Retrieve the list of slaves.