com.hazelcast.core

Class MembershipEvent

java.lang.Object

java.util.EventObject

com.hazelcast.core.MembershipEvent

All Implemented Interfaces:

Serializable

public class MembershipEvent
extends EventObject

Membership event fired when a new member is added to the cluster and/or when a member leaves the cluster. If you also need to receive the initial members of the cluster, you can have a look at the InitialMembershipListener.

See Also:

MembershipListener, InitialMembershipEvent, InitialMembershipListener, Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static int	MEMBER_ADDED
static int	MEMBER_REMOVED

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Constructor and Description
MembershipEvent(Cluster cluster, Member member, int eventType, Set<Member> members)

Method Summary

Methods

Modifier and Type	Method and Description
Cluster	getCluster() Returns the cluster of the event.
int	getEventType() Returns the membership event type; #MEMBER_ADDED or #MEMBER_REMOVED
Member	getMember() Returns the removed or added member.
Set<Member>	getMembers() Returns a consistent view of the the members exactly after this MembershipEvent has been processed.
String	toString()

Methods inherited from class java.util.EventObject

getSource

Methods inherited from class java.lang.Object

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

Field Detail

MEMBER_ADDED

public static final int MEMBER_ADDED

See Also:

Constant Field Values

MEMBER_REMOVED

public static final int MEMBER_REMOVED

See Also:

Constant Field Values

Constructor Detail

MembershipEvent

public MembershipEvent(Cluster cluster,
               Member member,
               int eventType,
               Set<Member> members)

Method Detail

getMembers

public Set<Member> getMembers()

Returns a consistent view of the the members exactly after this MembershipEvent has been processed. So if a member is removed, the returned set will not include this member. And if a member is added it will include this member. The problem with calling the Cluster.getMembers() is that the content could already have changed while processing this event so it becomes very difficult to write a deterministic algorithm since you can't get a deterministic view of the members. This method solves that problem. The set is immutable and ordered. For more information see Cluster.getMembers(). On the client null is returned to indicate that this functionality is not implemented.

Returns:

the members at the moment after this event. Or null if this event is send on the client side.

getCluster

public Cluster getCluster()

Returns the cluster of the event.

Returns:

getEventType

public int getEventType()

Returns the membership event type; #MEMBER_ADDED or #MEMBER_REMOVED

Returns:

the membeship event type

getMember

public Member getMember()

Returns the removed or added member.

Returns:

member which is removed/added

toString

public String toString()

Overrides:

toString in class EventObject