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java.lang.Objectorg.javagroups.stack.Protocol
org.javagroups.protocols.pbcast.PBCAST
Implementation of probabilistic broadcast. Sends group messages via unreliable multicast. Gossips regularly to a random subset of group members to retransmit missing messages. Gossiping is used both for bringing all members to the same state (having received the same messages) and to garbage-collect messages seen by all members (gc is piggybacked in gossip messages). See DESIGN for more details.
Field Summary |
Fields inherited from class org.javagroups.stack.Protocol |
down_handler, down_prot, down_queue, down_thread, down_thread_prio, observer, props, stack, up_handler, up_prot, up_queue, up_thread, up_thread_prio |
Constructor Summary | |
PBCAST()
|
Method Summary | |
void |
down(Event evt)
An event is to be sent down the stack. |
java.lang.String |
getName()
|
java.util.Vector |
providedUpServices()
List of events that are provided to layers above (they will be handled when sent down from above). |
void |
run()
Gossip thread. |
boolean |
setProperties(java.util.Properties props)
Setup the Protocol instance acording to the configuration string |
void |
stop()
This method is called on a Channel.disconnect() . |
void |
up(Event evt)
An event was received from the layer below. |
Methods inherited from class org.javagroups.stack.Protocol |
destroy, getDownProtocol, getDownQueue, getProperties, getUpProtocol, getUpQueue, init, passDown, passUp, providedDownServices, receiveDownEvent, receiveUpEvent, requiredDownServices, requiredUpServices, setDownProtocol, setObserver, setPropertiesInternal, setProtocolStack, setUpProtocol, start, startDownHandler, startUpHandler, stopInternal |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public PBCAST()
Method Detail |
public java.lang.String getName()
getName
in class Protocol
public java.util.Vector providedUpServices()
Protocol
providedUpServices
in class Protocol
public void stop()
Protocol
Channel.disconnect()
. Stops work (e.g. by closing multicast socket).
Will be called from top to bottom. This means that at the time of the method invocation the
neighbor protocol below is still working. This method will replace the
STOP, STOP_OK, CLEANUP and CLEANUP_OK events. The ProtocolStack guarantees that
when this method is called all messages in the down queue will have been flushed
stop
in class Protocol
public void up(Event evt)
Protocol
passDown()
or c) the event (or another event) is sent up
the stack using passUp()
.
up
in class Protocol
public void down(Event evt)
Protocol
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()
.
down
in class Protocol
public void run()
gossip_interval
msecs
run
in interface java.lang.Runnable
public boolean setProperties(java.util.Properties props)
setProperties
in class Protocol
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