org.jgroups.protocols
Class TCPGOSSIP
java.lang.Object
org.jgroups.stack.Protocol
org.jgroups.protocols.Discovery
org.jgroups.protocols.TCPGOSSIP
public class TCPGOSSIP
- extends Discovery
The TCPGOSSIP protocol layer retrieves the initial membership (used by the GMS when started
by sending event FIND_INITIAL_MBRS down the stack).
We do this by contacting one or more GossipServers, which must be running at well-known
addresses:ports. The responses should allow us to determine the coordinator whom we have to
contact, e.g. in case we want to join the group. When we are a server (after having
received the BECOME_SERVER event), we'll respond to TCPGOSSIP requests with a TCPGOSSIP
response.
The FIND_INITIAL_MBRS event will eventually be answered with a
FIND_INITIAL_MBRS_OK event up the stack.
- Author:
- Bela Ban
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 |
Methods inherited from class org.jgroups.protocols.Discovery |
down, findInitialMembers, findInitialMembersAsString, getNumberOfDiscoveryRequestsSent, getNumInitialMembers, getNumPingRequests, getTimeout, handleConnect, handleDisconnect, localAddressSet, makeView, providedUpServices, resetStats, setNumInitialMembers, setNumPingRequests, setTimeout, up |
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, receiveDownEvent, receiveUpEvent, requiredDownServices, requiredUpServices, 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 |
TCPGOSSIP
public TCPGOSSIP()
getName
public java.lang.String getName()
- Specified by:
getName
in class Protocol
setProperties
public boolean setProperties(java.util.Properties props)
- Description copied from class:
Discovery
- sets the properties of the PING protocol.
The following properties are available
property: timeout - the timeout (ms) to wait for the initial members, default is 3000=3 secs
property: num_initial_members - the minimum number of initial members for a FIND_INITAL_MBRS, default is 2
- Overrides:
setProperties
in class Discovery
- Parameters:
props
- - a property set
- Returns:
- returns true if all properties were parsed properly
returns false if there are unrecnogized properties in the property set
start
public void start()
throws java.lang.Exception
- Description copied from class:
Protocol
- This method is called on a
Channel.connect(String)
. 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.
- Overrides:
start
in class Discovery
- Throws:
java.lang.Exception
- Thrown if protocol cannot be started successfully. This will cause the ProtocolStack
to fail, so Channel.connect(String)
will throw an exception
stop
public void stop()
- Description copied from class:
Protocol
- This method is called on a
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
- Overrides:
stop
in class Discovery
handleConnectOK
public void handleConnectOK()
- Description copied from class:
Discovery
- Called when CONNECT_OK has been received
- Overrides:
handleConnectOK
in class Discovery
sendGetMembersRequest
public void sendGetMembersRequest()
- Specified by:
sendGetMembersRequest
in class Discovery
Copyright ? 1998-2005 Bela Ban. All Rights Reserved.