org.jgroups.protocols
Class TCPGOSSIP

java.lang.Object
  extended by org.jgroups.stack.Protocol
      extended by org.jgroups.protocols.Discovery
          extended by 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 GossipRouters, 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

Field Summary
 
Fields inherited from class org.jgroups.stack.Protocol
down_prot, log, props, stack, stats, up_prot
 
Constructor Summary
TCPGOSSIP()
           
 
Method Summary
 void destroy()
          This method is called on a Channel.close().
 java.lang.String getName()
           
 void handleConnect()
           
 void handleDisconnect()
           
 void sendGetMembersRequest()
           
 boolean setProperties(java.util.Properties props)
          sets the properties of the PING protocol.
 void start()
          This method is called on a Channel.connect(String).
 void stop()
          This method is called on a Channel.disconnect().
 
Methods inherited from class org.jgroups.protocols.Discovery
down, findInitialMembers, findInitialMembersAsString, getNumberOfDiscoveryRequestsSent, getNumInitialMembers, getNumPingRequests, getTimeout, init, localAddressSet, makeView, providedUpServices, resetStats, setNumInitialMembers, setNumPingRequests, setTimeout, up
 
Methods inherited from class org.jgroups.stack.Protocol
downThreadEnabled, dumpStats, enableStats, getDownProtocol, getProperties, getProtocolStack, getThreadFactory, getTransport, getUpProtocol, printStats, providedDownServices, requiredDownServices, requiredUpServices, setDownProtocol, setPropertiesInternal, setProtocolStack, setUpProtocol, statsEnabled, upThreadEnabled
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

TCPGOSSIP

public TCPGOSSIP()
Method Detail

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

destroy

public void destroy()
Description copied from class: Protocol
This method is called on a Channel.close(). Does some cleanup; after the call the VM will terminate

Overrides:
destroy in class Protocol

handleConnect

public void handleConnect()
Overrides:
handleConnect in class Discovery

handleDisconnect

public void handleDisconnect()
Overrides:
handleDisconnect in class Discovery

sendGetMembersRequest

public void sendGetMembersRequest()
Specified by:
sendGetMembersRequest in class Discovery


Copyright ? 1998-2008 Bela Ban. All Rights Reserved.