def sched(ch, graph):
"""Sits in an infinite loop waiting on the channel to receive data.
The procedure prolog takes care of sorting the
input graph into a dependency list and initializing
the filter tasklets used to construct the graph.
@param graph: The graph representing the work flow
@type graph: Python dict organized as a graph struct
@param ch: The stackless channel to listen on
@type ch: stackless.channel
@return: nothing
"""
# Added so that incoming data is fed to every input adapter
# should check if in exists and create it if it doesn't
# because a user could remove the input port by accident
nodes = connect_graph_components(graph)
tasks = schedule_recursively(nodes)
inputEdges = []
# Connect all the adapters to the input
for node in nodes:
if node.get_type() == 'ADAPTER':
ie = Pype()
node.connect_input('in', ie)
inputEdges.append(ie)
while True:
data = ch.receive()
for ie in inputEdges:
ie.send(data)
try:
tasks[0].run()
except:
traceback.print_exc()
def sched(ch, graph):
"""Sits in an infinite loop waiting on the channel to receive data.
The procedure prolog takes care of sorting the
input graph into a dependency list and initializing
the filter tasklets used to construct the graph.
@param graph: The graph representing the work flow
@type graph: Python dict organized as a graph struct
@param ch: The stackless channel to listen on
@type ch: stackless.channel
@return: nothing
"""
# Added so that incoming data is fed to every input adapter
# should check if in exists and create it if it doesn't
# because a user could remove the input port by accident
nodes = connect_graph_components(graph)
tasks = schedule_recursively(nodes)
inputEdges = []
# Connect all the adapters to the input
for node in nodes:
if node.get_type() == 'ADAPTER':
ie = Pype()
node.connect_input('in', ie)
inputEdges.append(ie)
while True:
data = ch.receive()
for ie in inputEdges:
ie.send(data)
try:
tasks[0].run()
except:
traceback.print_exc()
def connect_graph_components(graph):
"""Sort the components and connect the output of a component to the
input of the next.
@param graph: The graph representing the work flow
@type graph: Python dict organized as a graph struct
@return nodes: The sorted nodes in the graph
"""
edgeList = get_pairlist(graph)
nodes = topsort(edgeList)
pipes = []
for n in nodes:
try:
# get this nodes outputs
edges = graph[n]
except:
pass
else:
# for each output
for e in edges:
pipe = Pype()
pipes.append(pipe)
# does the output port exist?
if not n.has_port(edges[e][0]):
raise ComponentPortError('''Trying to connect undefined
output port {0} {1}'''.format(n, edges[e][0]))
else:
n.connect_output(edges[e][0], pipe)
# does the input port exist?
if not e.has_port(edges[e][1]):
raise ComponentPortError('''Trying to connect undefined
input port {0} {1}'''.format(e, edges[e][1]))
else:
e.connect_input(edges[e][1], pipe)
return nodes
if hello.has_port('test1'):
print 'Description for port "test1" -->', \
hello.get_port_description('test1')
print 'Description for port "out" -->', hello.get_port_description('out')
if hello.has_port('test2'):
print 'HelloWorld contains a port called "test2"'
else:
print 'HelloWorld does not contain a port called "test2"'
print 'Connection status for HelloWorld port "out":', \
hello.is_connected('out')
# we need two pypes (2 edges)
p1 = Pype()
p2 = Pype()
# A component is written as a stackless tasklet
# We need to let stackless know. We only need a reference
# to the first tasklet which is where we will send data
t = stackless.tasklet(hello.run)()
stackless.tasklet(printer.run)()
print 'Connecting ports now...'
# now we connect the nodes using the pypes we created
hello.connect_input('in', p1)
hello.connect_output('out', p2)
printer.connect_input('in', p2)
# Now the connection status on "out" should be True since we've just connected it
print 'Description for port "in" -->', hello.get_port_description("in")
if hello.has_port("test1"):
print 'Description for port "test1" -->', hello.get_port_description("test1")
print 'Description for port "out" -->', hello.get_port_description("out")
if hello.has_port("test2"):
print 'HelloWorld contains a port called "test2"'
else:
print 'HelloWorld does not contain a port called "test2"'
print 'Connection status for HelloWorld port "out":', hello.is_connected("out")
# we need two pypes (2 edges)
p1 = Pype()
p2 = Pype()
# A component is written as a stackless tasklet
# We need to let stackless know. We only need a reference
# to the first tasklet which is where we will send data
t = stackless.tasklet(hello.run)()
stackless.tasklet(printer.run)()
print "Connecting ports now..."
# now we connect the nodes using the pypes we created
hello.connect_input("in", p1)
hello.connect_output("out", p2)
printer.connect_input("in", p2)
# Now the connection status on "out" should be True since we've just connected it
