Package org.apache.camel.component.zookeepermaster.group

Interface Group<T extends NodeState>

All Superinterfaces:
AutoCloseable, Closeable
All Known Subinterfaces:
MultiGroup<T>
All Known Implementing Classes:
DelegateZooKeeperGroup, DelegateZooKeeperMultiGroup, ZooKeeperGroup, ZooKeeperMultiGroup
public interface Group<T extends NodeState> extends Closeable

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    add(GroupListener<T> listener)
    Registers a listener which will be called when the cluster membership changes or the group is connected or disconnected.
    void
    close()
    A member should be closed to release acquired resources used to monitor the group membership.
    T
    getLastState()
    Gets the last state.
    boolean
    isConnected()
    Are we connected with the cluster?
    boolean
    isMaster()
    Check if we are the master.
    T
    master()
    Retrieve the master node.
    Map<String,T>
    members()
    Get the list of members connected to this group.
    void
    remove(GroupListener<T> listener)
    Removes a previously added listener.
    List<T>
    slaves()
    Retrieve the list of slaves.
    void
    start()
    Start this member
    void
    update(T state)
    Update the state of this group member.

  • Method Details

    • isConnected

      boolean isConnected()
      Are we connected with the cluster?

    • start

      void start()
      Start this member

    • close

      void close() throws IOException
      A member should be closed to release acquired resources used to monitor the group membership. When the member is closed, any memberships registered via this Group will be removed from the group.
      Specified by:
      close in interface AutoCloseable
      Specified by:
      close in interface Closeable
      Throws:
      IOException

    • add

      void add(GroupListener<T> listener)
      Registers a listener which will be called when the cluster membership changes or the group is connected or disconnected.

    • remove

      void remove(GroupListener<T> listener)
      Removes a previously added listener.

    • update

      void update(T state)
      Update the state of this group member. If the state is null, the member will leave the group. This method can be called even if the group is not started, in which case the state will be stored and updated when the group becomes started.
      Parameters:
      state - the new state of this group member

    • members

      Map<String,T> members()
      Get the list of members connected to this group.

    • isMaster

      boolean isMaster()
      Check if we are the master.

    • master

      T master()
      Retrieve the master node.

    • slaves

      List<T> slaves()
      Retrieve the list of slaves.

    • getLastState

      T getLastState()
      Gets the last state.

      This can be used by clients to access that last state, such as when the clients is being added as a listener but wants to retrieve the last state to be up to date when the client is added.

      Returns:
      the state, or null if no last state yet.