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# Authors: Jason Power

import m5

class BaseTopology(object):
    description = "BaseTopology"

    def __init__(self):
        """ When overriding place any objects created in
            configs/ruby/<protocol>.py that are needed in
            makeTopology (below) here. The minimum is usually
            all of the controllers created in the above file.
        """

    def makeTopology(self, options, IntLink, ExtLink, Router):
        """ Called from configs/ruby/Ruby.py
            The return value is ( list(Router), list(IntLink), list(ExtLink))
            The API of this function cannot change when subclassing!!
            Any additional information needed to create this topology should
            be passed into the constructor when it's instantiated in
            configs/ruby/<protocol>.py
        """
        m5.util.fatal("BaseTopology should have been overridden!!")

class SimpleTopology(BaseTopology):
    """ Provides methods needed for the topologies included in Ruby before
        topology changes.
        These topologies are "simple" in the sense that they only use a flat
        list of controllers to construct the topology.
    """
    description = "SimpleTopology"

    def __init__(self, controllers):
        self.nodes = controllers

    def addController(self, controller):
        self.nodes.append(controller)

    def __len__(self):
        return len(self.nodes)
