com.hazelcast.core
Class MembershipEvent

java.lang.Object
  extended by java.util.EventObject
      extended by com.hazelcast.core.MembershipEvent
All Implemented Interfaces:
Serializable
Direct Known Subclasses:
MemberAttributeEvent, MembershipServiceEvent

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.

See Also:
MembershipListener, Serialized Form

Field Summary
static int MEMBER_ADDED
          This event type is fired when a new member joins the cluster.
static int MEMBER_ATTRIBUTE_CHANGED
          This event type is fired if a member attribute has been changed or removed.
static int MEMBER_REMOVED
          This event type is fired if a member left the cluster or was decided to be unresponsive by other members for a extended time.
 
Fields inherited from class java.util.EventObject
source
 
Constructor Summary
MembershipEvent(Cluster cluster, Member member, int eventType, Set<Member> members)
           
 
Method Summary
 Cluster getCluster()
          Returns the cluster of the event.
 int getEventType()
          Returns the membership event type; #MEMBER_ADDED #MEMBER_REMOVED #MEMBER_ATTRIBUTE_CHANGED
 Member getMember()
          Returns the removed or added member.
 Set<Member> getMembers()
          Returns a consistent view of the the members immediately 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
This event type is fired when a new member joins the cluster.

See Also:
Constant Field Values

MEMBER_REMOVED

public static final int MEMBER_REMOVED
This event type is fired if a member left the cluster or was decided to be unresponsive by other members for a extended time.

See Also:
Constant Field Values

MEMBER_ATTRIBUTE_CHANGED

public static final int MEMBER_ATTRIBUTE_CHANGED
This event type is fired if a member attribute has been changed or removed.

Since:
3.2
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 immediately after this MembershipEvent has been processed. If a member is removed, the returned set will not include this member. If a member is added, it will include this member.

The problem with calling the Cluster.getMembers() method is that the content could already have changed while processing this event, so it becomes very difficult to write a deterministic algorithm since you cannot get a deterministic view of the members. This method solves that problem.

The set is immutable and ordered. For more information see Cluster.getMembers().

Returns:
the members at the moment after this event.

getCluster

public Cluster getCluster()
Returns the cluster of the event.

Returns:
the current cluster instance

getEventType

public int getEventType()
Returns the membership event type; #MEMBER_ADDED #MEMBER_REMOVED #MEMBER_ATTRIBUTE_CHANGED

Returns:
the membership event type

getMember

public Member getMember()
Returns the removed or added member.

Returns:
member which is removed or added

toString

public String toString()
Overrides:
toString in class EventObject


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