jgroup.relacs.events
Class Event

java.lang.Object
  jgroup.relacs.events.Event

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, EventTags

Direct Known Subclasses:

DaemonFailureEvent, DeliveryAck, DeliveryEvent, InstallAck, InstallEvent, JoinRequest, LeaveRequest, MemberLeftEvent, MulticastRequest, PrepareAck, PrepareEvent

public class Event
extends java.lang.Object
implements EventTags, java.io.Externalizable

The Event class is the common superclass for all events that may be exchanged between the daemon and members. Different types of events are distinguished using an integer tag, that may be obtained using method getTag(). Each event is associated to a group identifier, that may be obtained using method getGid(). The group identifier is needed because an application may be member of most than one group at a time.

Since:

Jgroup 1.2

Author:

Alberto Montresor

See Also:

Serialized Form

Field Summary

protected int	gid Group identifier
protected int	tag Tag identifying the event

Fields inherited from interface jgroup.relacs.events.EventTags

DAEMON_FAILURE_EVENT, DELIVERY_ACK, DELIVERY_EVENT, INSTALL_ACK, INSTALL_EVENT, JOIN_REQUEST, LEAVE_REQUEST, MEMBER_LEFT_EVENT, MULTICAST_REQUEST, PREPARE_ACK, PREPARE_EVENT

Constructor Summary

Event()
Default constructor for externalization.

Event(int tag, int gid)
Constructs a new generic Event object.

Method Summary

int	getGid() Returns the group identifier associated with this event.
int	getTag() Returns the tag identifying this event.
void	readExternal(java.io.ObjectInput in) Restores the content of this object from the marshalled data contained in the specified input stream.
java.lang.String	toString()
void	writeExternal(java.io.ObjectOutput out) Marshals the content of this object to the specified output stream.

Methods inherited from class java.lang.Object

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

Field Detail

tag

protected int tag

Tag identifying the event

gid

protected int gid

Group identifier

Constructor Detail

Event

public Event()

Default constructor for externalization.

Event

public Event(int tag,
             int gid)

Constructs a new generic Event object.

Parameters:

tag - tag identifying the event

gid - group identifier

Method Detail

getTag

public int getTag()

Returns the tag identifying this event.

getGid

public int getGid()

Returns the group identifier associated with this event.

readExternal

public void readExternal(java.io.ObjectInput in)
                  throws java.io.IOException,
                         java.lang.ClassNotFoundException

Restores the content of this object from the marshalled data contained in the specified input stream.

Specified by:

readExternal in interface java.io.Externalizable

Parameters:

in - the stream to be read

Throws:

java.io.IOException

java.lang.ClassNotFoundException

writeExternal

public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException

Marshals the content of this object to the specified output stream.

Specified by:

writeExternal in interface java.io.Externalizable

Parameters:

out - the stream to be written

Throws:

java.io.IOException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object