extended by org.jgroups.stack.Protocol
      extended by org.jgroups.protocols.PARTITION

public class PARTITION
extends Protocol

Protocol to simulate a partition. This can be done in 2 ways: send down a PARTITION event (with a boolean flag on or off, to start or end a partition), or by grabbing a reference to the protocol via the ProtocolStack and calling the methods startPartition() or stopPartition() directly. This can also be done via JMX.

A partition simply discards all messages, but let's other events pass.

$Id:,v 1.4 2008/03/08 09:46:46 vlada Exp $
Bela Ban

Field Summary
protected  Address local_address
protected  boolean partition_on
Fields inherited from class org.jgroups.stack.Protocol
down_prot, log, stack, stats, up_prot
Constructor Summary
Method Summary
 java.lang.Object down(Event evt)
          An event is to be sent down the stack.
 java.lang.String getName()
          All protocol names have to be unique !
 boolean isPartitionOn()
 void startPartition()
 void stopPartition()
 java.lang.Object up(Event evt)
          An event was received from the layer below.
Methods inherited from class org.jgroups.stack.Protocol
destroy, downThreadEnabled, dumpStats, enableStats, getConfigurableObjects, getDownProtocol, getProperties, getProtocolStack, getThreadFactory, getTransport, getUpProtocol, init, printStats, providedDownServices, providedUpServices, requiredDownServices, requiredUpServices, resetStats, setDownProtocol, setProperties, setPropertiesInternal, setProperty, setProtocolStack, setUpProtocol, start, statsEnabled, stop, upThreadEnabled
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail


protected boolean partition_on


protected Address local_address
Constructor Detail


public PARTITION()
Method Detail


public java.lang.String getName()
Description copied from class: Protocol
All protocol names have to be unique !

Specified by:
getName in class Protocol


public boolean isPartitionOn()


public void startPartition()


public void stopPartition()


public java.lang.Object down(Event evt)
Description copied from class: Protocol
An event is to be sent down the stack. The layer may want to examine its type and perform some action on it, depending on the event's type. If the event is a message MSG, then the layer may need to add a header to it (or do nothing at all) before sending it down the stack using down_prot.down(). In case of a GET_ADDRESS event (which tries to retrieve the stack's address from one of the bottom layers), the layer may need to send a new response event back up the stack using up_prot.up().

down in class Protocol


public java.lang.Object up(Event evt)
Description copied from class: Protocol
An event was received from the layer below. Usually the current layer will want to examine the event type and - depending on its type - perform some computation (e.g. removing headers from a MSG event type, or updating the internal membership list when receiving a VIEW_CHANGE event). Finally the event is either a) discarded, or b) an event is sent down the stack using down_prot.down() or c) the event (or another event) is sent up the stack using up_prot.up().

up in class Protocol

Copyright © 1998-2009 Bela Ban / Red Hat. All Rights Reserved.