Class TCPPING


public class TCPPING extends Discovery
The TCPPING protocol layer retrieves the initial membership in answer to the GMS's FIND_INITIAL_MBRS event. The initial membership is retrieved by directly contacting other group members, sending point-to-point mebership requests. The responses should allow us to determine the coordinator whom we have to contact in case we want to join the group. When we are a server (after having received the BECOME_SERVER event), we'll respond to TCPPING requests with a TCPPING response.

The FIND_INITIAL_MBRS event will eventually be answered with a FIND_INITIAL_MBRS_OK event up the stack.

The TCPPING protocol requires a static conifiguration, which assumes that you to know in advance where to find other members of your group. For dynamic discovery, use the PING protocol, which uses multicast discovery, or the TCPGOSSIP protocol, which contacts a Gossip Router to acquire the initial membership.

Author:
Bela Ban
  • Constructor Details

    • TCPPING

      public TCPPING()
  • Method Details

    • getName

      public String getName()
      Specified by:
      getName in class Protocol
    • getInitialHosts

      public List<Address> getInitialHosts()
      Returns the list of initial hosts as configured by the user via XML. Note that the returned list is mutable, so careful with changes !
      Returns:
      List
      list of initial hosts. This variable is only set after the channel has been created and set Properties() has been called
    • setProperties

      public boolean setProperties(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
    • localAddressSet

      public void localAddressSet(Address addr)
      Description copied from class: Discovery
      Called after local_addr was set
      Overrides:
      localAddressSet in class Discovery
    • sendGetMembersRequest

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