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

Author:
Bela Ban

Nested Class Summary
static class SEQUENCER.SequencerHeader
           
 
Field Summary
 
Fields inherited from class org.jgroups.stack.Protocol
down_prot, ergonomics, id, log, name, stack, stats, up_prot
 
Constructor Summary
SEQUENCER()
           
 
Method Summary
 java.lang.Object down(Event evt)
          An event is to be sent down the stack.
 java.util.Map<java.lang.String,java.lang.Object> dumpStats()
           
 long getBroadcast()
           
 Address getCoordinator()
           
 long getForwarded()
           
 Address getLocalAddress()
           
 long getReceivedBroadcasts()
           
 long getReceivedForwards()
           
 boolean isCoordinator()
           
 java.lang.String printStats()
           
 void resetStats()
           
 java.lang.Object up(Event evt)
          An event was received from the layer below.
 
Methods inherited from class org.jgroups.stack.Protocol
destroy, downThreadEnabled, enableStats, getConfigurableObjects, getDownProtocol, getId, getLevel, getName, getProperties, getProtocolStack, getSocketFactory, getThreadFactory, getTransport, getUpProtocol, getValue, init, isErgonomics, providedDownServices, providedUpServices, requiredDownServices, requiredUpServices, setDownProtocol, setErgonomics, setId, setLevel, setProperties, setPropertiesInternal, setProperty, setProtocolStack, setSocketFactory, setUpProtocol, setValue, setValues, start, statsEnabled, stop, 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()

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<java.lang.String,java.lang.Object> dumpStats()
Overrides:
dumpStats in class Protocol

printStats

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

down

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().

Overrides:
down in class Protocol

up

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().

Overrides:
up in class Protocol


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