def __init__(self, dsn):
self.trunk = Trunk(dsn)
################################################################################
#Make trunk segments that will connect the nodes
################################################################################
#a list of specific attachment points overrides the number of nodes argument
if(config['attach_points']):
config['nodes'] = len(config['attach_points'])
#this object figures out how many cable segments are needed and what length each segment
#should be.
#trunk object figures out a list of attach_points after this object is instantiated
trunk=Trunk( length=config['length']
, nodes=config['nodes']
, start_pad=config['start_pad']
, end_pad=config['end_pad']
, separation_min=config['separation_min']
, start_attach=config['start_attach']
, end_attach=config['end_attach']
, random_attach=config['random_attach']
, attach_error=config['attach_error']
, attach_points=config['attach_points']
, max_seg_length=(1/config['segments_per_meter'])
)
#feed back precise attach points into json data structure
config['attach_points'] = trunk.attach_points
#Prepare a data structure to hold cable models and trunk segment parameters
#actual number of cables segments is between nnodes-1 and nnodes+1
#add an extra cable segment if attach_point[0] != 0
#add an extra cable segment if attach_point[-1] != config['length']
#always declare space for segment[0] and segment[nodes+1]
#expect that segment[0] and segment[nodes+1] will be ignored later if they are not needed
def setUp(self):
dsn = os.environ.get("DATABASE_URL")
self.listener = Trunk(dsn or "postgres://localhost/trunk")
self.notifier = Trunk(dsn or "postgres://localhost/trunk")
