org.jgroups.protocols
Class SEQUENCER

java.lang.Object
  extended by org.jgroups.stack.Protocol
      extended by org.jgroups.protocols.SEQUENCER

public class SEQUENCER
extends Protocol

Implementation of total order protocol using a sequencer. Consult doc/design/SEQUENCER.txt for details

Version:
$Id: SEQUENCER.java,v 1.11.2.1 2007/04/27 08:03:52 belaban Exp $
Author:
Bela Ban

Nested Class Summary
static class SEQUENCER.SequencerHeader
           
 
Field Summary
 
Fields inherited from class org.jgroups.stack.Protocol
down_handler, down_prot, down_queue, down_thread, down_thread_prio, log, observer, props, stack, stats, up_handler, up_prot, up_queue, up_thread, up_thread_prio
 
Constructor Summary
SEQUENCER()
           
 
Method Summary
 void down(Event evt)
          An event is to be sent down the stack.
 java.util.Map dumpStats()
           
 long getBroadcast()
           
 Address getCoordinator()
           
 long getForwarded()
           
 Address getLocalAddress()
           
 java.lang.String getName()
           
 long getReceivedBroadcasts()
           
 long getReceivedForwards()
           
 boolean isCoordinator()
           
 java.lang.String printStats()
           
 void resetStats()
           
 boolean setProperties(java.util.Properties props)
          Configures the protocol initially.
 void up(Event evt)
          An event was received from the layer below.
 
Methods inherited from class org.jgroups.stack.Protocol
destroy, downThreadEnabled, enableStats, getDownProtocol, getDownQueue, getProperties, getUpProtocol, getUpQueue, handleSpecialDownEvent, init, passDown, passUp, providedDownServices, providedUpServices, receiveDownEvent, receiveUpEvent, requiredDownServices, requiredUpServices, setDownProtocol, setObserver, setPropertiesInternal, setProtocolStack, setUpProtocol, start, startDownHandler, startUpHandler, statsEnabled, stop, stopInternal, upThreadEnabled
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

SEQUENCER

public SEQUENCER()
Method Detail

isCoordinator

public boolean isCoordinator()

getCoordinator

public Address getCoordinator()

getLocalAddress

public Address getLocalAddress()

getName

public java.lang.String getName()
Specified by:
getName in class Protocol

getForwarded

public long getForwarded()

getBroadcast

public long getBroadcast()

getReceivedForwards

public long getReceivedForwards()

getReceivedBroadcasts

public long getReceivedBroadcasts()

resetStats

public void resetStats()
Overrides:
resetStats in class Protocol

dumpStats

public java.util.Map dumpStats()
Overrides:
dumpStats in class Protocol

printStats

public java.lang.String printStats()
Overrides:
printStats in class Protocol

setProperties

public boolean setProperties(java.util.Properties props)
Description copied from class: Protocol
Configures the protocol initially. A configuration string consists of name=value items, separated by a ';' (semicolon), e.g.:
 "loopback=false;unicast_inport=4444"
 

Overrides:
setProperties in class Protocol

down

public void 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 passDown(). 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 passUp().

Overrides:
down in class Protocol

up

public void 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 passDown() or c) the event (or another event) is sent up the stack using passUp().

Overrides:
up in class Protocol


Copyright ? 1998-2006 Bela Ban. All Rights Reserved.