Package jade.core.replication

Class AddressNotificationService

  • All Implemented Interfaces:
    Service
    public class AddressNotificationService
extends BaseService
    A kernel-level service to manage a ring of Main Containers, keeping the various replicas in sync and providing failure detection and recovery to make JADE tolerate Main Container crashes.
    Author:
    Giovanni Rimassa - FRAMeTech s.r.l.

    • Constructor Detail

      • AddressNotificationService

        public AddressNotificationService()

    • Method Detail

      • init

        public void init​(AgentContainer ac,
                 Profile p)
          throws ProfileException
        Description copied from interface: Service
        Performs the passive initialization step of the service. This method is called before activating the service. Its role should be simply the one of a constructor, setting up the internal data as needed. Service implementations should not use the Service Manager and Service Finder facilities from within this method. A distributed initialization protocol, if needed, should be exectuted within the boot() method.
        Specified by:
        init in interface Service
        Overrides:
        init in class BaseService
        Parameters:
        ac - The agent container this service is activated on.
        p - The configuration profile for this service.
        Throws:
        ProfileException - If the given profile is not valid.

      • getName

        public String getName()
        Description copied from interface: Service
        Retrieve the name of this service, that can be used to look up its slices in the Service Finder.
        Returns:
        The name of this service.
        See Also:
        ServiceFinder

      • getHorizontalInterface

        public Class<?> getHorizontalInterface()
        Description copied from class: BaseService
        This should be properly implemented by the services that have non-empty slices.
        Specified by:
        getHorizontalInterface in interface Service
        Overrides:
        getHorizontalInterface in class BaseService
        Returns:
        A Class object, representing the interface that is implemented by the slices of this service. Let s be the Class object corresponding to the Service.Slice interface, and let c be the returned Class object. Then, the two following conditions must hold:
        1. c.isInterface() == true
        2. s.isAssignableFrom(c) == true

      • getLocalSlice

        public Service.Slice getLocalSlice()
        Description copied from class: BaseService
        This should be properly implemented by the services that have non-empty slices.
        Specified by:
        getLocalSlice in interface Service
        Overrides:
        getLocalSlice in class BaseService
        Returns:
        The slice of this service that resides on the local platform node, or null if no such slice exists.

      • getCommandFilter

        public Filter getCommandFilter​(boolean direction)
        Description copied from class: BaseService
        This should be properly implemented by the services that have filters. Note that when called multiple times with the same value of the direction parameter this method MUST always return the same object!
        Specified by:
        getCommandFilter in interface Service
        Overrides:
        getCommandFilter in class BaseService
        Parameters:
        direction - One of the two constants Filter.INCOMING and Filter.OUTGOING, distinguishing between the two filter chains managed by the command processor.
        Returns:
        A Filter object, used by this service to intercept and process kernel-level commands. If the service does not wish to install a command filter for one or both directions, it can just return null when appropriate.
        See Also:
        CommandProcessor

      • getCommandSink

        public Sink getCommandSink​(boolean side)
        Description copied from class: BaseService
        This should be properly implemented by the services that have sinks.
        Specified by:
        getCommandSink in interface Service
        Overrides:
        getCommandSink in class BaseService
        Parameters:
        side - One of the two constants Sink.COMMAND_SOURCE or Sink.COMMAND_TARGET, to state whether this sink will handle locally issued commands or commands incoming from remote nodes.
        Returns:
        Concrete services must return their own implementation of the Sink interface, that will be invoked by the kernel in order to consume any incoming vertical command owned by this service. If the service does not wish to install a command sink, it can just return null.
        See Also:
        Service.getOwnedCommands()

      • getOwnedCommands

        public String[] getOwnedCommands()
        Description copied from class: BaseService
        This should be properly implemented by the services that owns vertival commands.
        Specified by:
        getOwnedCommands in interface Service
        Overrides:
        getOwnedCommands in class BaseService
        Returns:
        An array containing the names of all the vertical commands this service wants to own. If this service has no such commands (it acts purely as a command filter), it can return an empty array, or null as well.
        See Also:
        jade.core.Service#getCommandSink()

      • boot

        public void boot​(Profile p)
          throws ServiceException
        Description copied from interface: Service
        Performs the active initialization step of a kernel-level service. When JADE kernel calls this method, the service has already been already associated with its container and registered with the Service Manager.
        Specified by:
        boot in interface Service
        Overrides:
        boot in class BaseService
        Parameters:
        p - The configuration profile for this service.
        Throws:
        ServiceException - If a problem occurs during service initialization.