Core seems ok

ld2dap/Filter.py

@@ -11,6 +11,7 @@
 from Input import Input
 from Output import Output
 
-class Filter(Input, Output):
+class Filter(Output, Input):
+    """Output should be first"""
     def __init__(self):
         super().__init__('Filter')

ld2dap/Input.py

@@ -18,5 +18,5 @@ class Input(Node):
     def register(self, output):
         self.outputs.append(output)
 
-    def run(self):
-        print('IMA INPUT N I RUNIN')
+    def _run(self):
+        print('I RUN ADSAOADIQJOWDOASJDOQIJWDOIJQOWIDJO')

ld2dap/Node.py

@@ -17,7 +17,7 @@ class Node:
         return ("Node:{}".format(self.name))
 
     def _run(self):
-        raise NotImplementedError('This method is virtual')
+        raise NotImplementedError('{} should override _run()'.format(self))
 
     def run(self):
         return self._run()

ld2dap/Output.py

@@ -34,4 +34,9 @@ class Output(Node):
     def _process(self, data):
         raise NotImplementedError('{} should override _process()'.format(self))
 
+    def _run(self):
+        if self.input is None:
+            raise RuntimeError('{} do not have an input'.format(self))
+        return self.input.run()
+
 

ld2dap/test.py

@@ -11,17 +11,22 @@
 from Node import Node
 from Filter import Filter
 from Input import Input
+from Output import Output
 
 def main():
+    i = Input()
+    o = Output()
     n = Filter()
     f = Filter()
     print(n)
-    n.run()
+    #n.run()
     print(n.input)
+    f.input = i
     n.input = f
+    o.input = n
+    o.run()
     print(n.input)
     print(f.outputs)
-    f.process(None)
 
 if __name__ == '__main__':
     main()