java.lang.Object
org.jgroups.stack.Protocol
org.jgroups.protocols.MERGE
- All Implemented Interfaces:
- java.lang.Runnable
- public class MERGE
- extends org.jgroups.stack.Protocol
- implements java.lang.Runnable
Simple and stupid MERGE protocol (does not take into account state transfer).
Periodically mcasts a HELLO message with its own address. When a HELLO message is
received from a member that has the same group (UDP discards all messages with a group
name different that our own), but is not currently in the group, a MERGE event is sent
up the stack. The protocol starts working upon receiving a View in which it is the coordinator.
| Fields inherited from class org.jgroups.stack.Protocol |
down_handler, down_prot, down_queue, down_thread, down_thread_prio, log, observer, props, stack, stats, trace, up_handler, up_prot, up_queue, up_thread, up_thread_prio, warn |
|
Constructor Summary |
MERGE()
|
| Methods inherited from class org.jgroups.stack.Protocol |
destroy, downThreadEnabled, dumpStats, enableStats, getDownProtocol, getDownQueue, getProperties, getUpProtocol, getUpQueue, handleSpecialDownEvent, init, isTrace, isWarn, passDown, passUp, printStats, providedDownServices, providedUpServices, receiveDownEvent, receiveUpEvent, requiredDownServices, requiredUpServices, resetStats, setDownProtocol, setObserver, setPropertiesInternal, setProtocolStack, setTrace, setUpProtocol, setWarn, startDownHandler, startUpHandler, statsEnabled, stopInternal, upThreadEnabled |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
members
final java.util.Vector members
local_addr
org.jgroups.Address local_addr
group_addr
java.lang.String group_addr
groupname
final java.lang.String groupname
hello_thread
java.lang.Thread hello_thread
timeout
long timeout
router_host
java.lang.String router_host
router_port
int router_port
client
org.jgroups.stack.RouterStub client
is_server
boolean is_server
is_coord
boolean is_coord
merging
boolean merging
MERGE
public MERGE()
getName
public java.lang.String getName()
setProperties
public boolean setProperties(java.util.Properties props)
- Description copied from class:
org.jgroups.stack.Protocol
- Configures the protocol initially. A configuration string consists of name=value
items, separated by a ';' (semicolon), e.g.:
"loopback=false;unicast_inport=4444"
start
public void start()
throws java.lang.Exception
- Description copied from class:
org.jgroups.stack.Protocol
- This method is called on a Channel.connect(String)>
Channel.connect(String) 55 . Starts work.
Protocols are connected and queues are ready to receive events.
Will be called from bottom to top. This call will replace
the START and START_OK events.
stop
public void stop()
- Description copied from class:
org.jgroups.stack.Protocol
- This method is called on a Channel.disconnect()>
Channel.disconnect() 55 . 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
up
public void up(org.jgroups.Event evt)
- Description copied from class:
org.jgroups.stack.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().
down
public void down(org.jgroups.Event evt)
- Description copied from class:
org.jgroups.stack.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().
run
public void run()
- If IP multicast: periodically mcast a HELLO message
If gossiping: periodically retrieve the membership. Any members not part of our
own membership are merged (passing MERGE event up).
- Specified by:
run in interface java.lang.Runnable
JAVADOC | 
SOURCE | 
DOWNLOAD | NESTED | FIELD | CONSTR | METHOD