io.fabric8.groups.internal

Class DelegateZooKeeperGroup<T extends NodeState>

java.lang.Object

io.fabric8.groups.internal.DelegateZooKeeperGroup<T>

All Implemented Interfaces:

Group<T>, Closeable, AutoCloseable

Direct Known Subclasses:

DelegateZooKeeperMultiGroup

public class DelegateZooKeeperGroup<T extends NodeState>
extends Object
implements Group<T>

Field Summary

Fields

Modifier and Type	Field and Description
protected Group<T>	group

Constructor Summary

Constructors

Constructor and Description
DelegateZooKeeperGroup(String path, Class<T> clazz)

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.
static void	closeQuietly(Closeable closeable)
protected Group<T>	createGroup(org.apache.curator.framework.CuratorFramework client, String path, Class<T> clazz)
protected void	doStart()
protected void	doStop()
T	getLastState() Gets the last state.
boolean	isConnected() Are we connected with the cluster?
boolean	isMaster() Check if we are the master.
T	master() Retrieve the master node.
Map<String,T>	members() Get the list of members connected to this group.
void	remove(GroupListener<T> listener) Removes a previously added listener.
List<T>	slaves() Retrieve the list of slaves.
void	start() Start this member
void	update(T state) Update the state of this group member.
void	useCurator(org.apache.curator.framework.CuratorFramework curator)

Methods inherited from class java.lang.Object

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

Field Detail

group

protected Group<T extends NodeState> group

Constructor Detail

DelegateZooKeeperGroup

public DelegateZooKeeperGroup(String path,
                      Class<T> clazz)

Method Detail

useCurator

public void useCurator(org.apache.curator.framework.CuratorFramework curator)

createGroup

protected Group<T> createGroup(org.apache.curator.framework.CuratorFramework client,
                   String path,
                   Class<T> clazz)

add

public void add(GroupListener<T> listener)

Description copied from interface: Group

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

Specified by:

add in interface Group<T extends NodeState>

remove

public void remove(GroupListener<T> listener)

Description copied from interface: Group

Removes a previously added listener.

Specified by:

remove in interface Group<T extends NodeState>

isConnected

public boolean isConnected()

Description copied from interface: Group

Are we connected with the cluster?

Specified by:

isConnected in interface Group<T extends NodeState>

start

public void start()

Description copied from interface: Group

Start this member

Specified by:

start in interface Group<T extends NodeState>

doStart

protected void doStart()

close

public void close()
           throws IOException

Description copied from interface: Group

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 Group<T extends NodeState>

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Throws:

IOException

doStop

protected void doStop()
               throws IOException

Throws:

IOException

update

public void update(T state)

Description copied from interface: Group

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.

Specified by:

update in interface Group<T extends NodeState>

Parameters:

state - the new state of this group member

members

public Map<String,T> members()

Description copied from interface: Group

Get the list of members connected to this group.

Specified by:

members in interface Group<T extends NodeState>

isMaster

public boolean isMaster()

Description copied from interface: Group

Check if we are the master.

Specified by:

isMaster in interface Group<T extends NodeState>

master

public T master()

Description copied from interface: Group

Retrieve the master node.

Specified by:

master in interface Group<T extends NodeState>

slaves

public List<T> slaves()

Description copied from interface: Group

Retrieve the list of slaves.

Specified by:

slaves in interface Group<T extends NodeState>

getLastState

public T getLastState()

Description copied from interface: Group

Gets the last state.

This can be used by clients to access that last state, such as when the clients is being added as a listener but wants to retrieve the last state to be up to date when the client is added.

Specified by:

getLastState in interface Group<T extends NodeState>

Returns:

the state, or null if no last state yet.

closeQuietly

public static void closeQuietly(Closeable closeable)