allow methods as process-based routing functions

CHANGES.rst

@@ -1,6 +1,9 @@
 History
 -------
 
++ **3.1.3** (2024-04-08)**
+    + Allows class methods as generator functions for process-based routing.
+
 + **3.1.2 (2024-04-08)**
     + Fix bug when using Mixture distribution.
 

ciw/import_params.py

@@ -115,7 +115,7 @@ def create_network_from_dictionary(params_input):
             )
         )
     for clss_name in params['customer_class_names']:
-        if all(isinstance(f, types.FunctionType) for f in params["routing"]):
+        if all(isinstance(f, types.FunctionType) or isinstance(f, types.MethodType) for f in params["routing"]):
             classes[clss_name] = CustomerClass(
                 params['arrival_distributions'][clss_name],
                 params['service_distributions'][clss_name],
@@ -140,7 +140,7 @@ def create_network_from_dictionary(params_input):
                 class_change_time_distributions[clss_name],
             )
     n = Network(nodes, classes)
-    if all(isinstance(f, types.FunctionType) for f in params["routing"]):
+    if all(isinstance(f, types.FunctionType) or isinstance(f, types.MethodType) for f in params["routing"]):
         n.process_based = True
     else:
         n.process_based = False
@@ -220,7 +220,7 @@ def validify_dictionary(params):
     Raises errors if there is something wrong with the
     parameters dictionary.
     """
-    if all(isinstance(f, types.FunctionType) for f in params["routing"]):
+    if all(isinstance(f, types.FunctionType) or isinstance(f, types.MethodType) for f in params["routing"]):
         consistant_num_classes = (
             params["number_of_classes"]
             == len(params["arrival_distributions"])
@@ -241,7 +241,7 @@ def validify_dictionary(params):
         )
     if not consistant_num_classes:
         raise ValueError("Ensure consistant number of classes is used throughout.")
-    if all(isinstance(f, types.FunctionType) for f in params["routing"]):
+    if all(isinstance(f, types.FunctionType) or isinstance(f, types.MethodType) for f in params["routing"]):
         consistant_class_names = (
             set(params["arrival_distributions"])
             == set(params["service_distributions"])
@@ -266,7 +266,7 @@ def validify_dictionary(params):
         )
     if not consistant_class_names:
         raise ValueError("Ensure consistant names for customer classes.")
-    if all(isinstance(f, types.FunctionType) for f in params["routing"]):
+    if all(isinstance(f, types.FunctionType) or isinstance(f, types.MethodType) for f in params["routing"]):
         num_nodes_count = (
             [params["number_of_nodes"]]
             + [len(obs) for obs in params["arrival_distributions"].values()]
@@ -296,7 +296,7 @@ def validify_dictionary(params):
         )
     if len(set(num_nodes_count)) != 1:
         raise ValueError("Ensure consistant number of nodes is used throughout.")
-    if not all(isinstance(f, types.FunctionType) for f in params["routing"]):
+    if not all(isinstance(f, types.FunctionType) or isinstance(f, types.MethodType) for f in params["routing"]):
         for clss in params["routing"].values():
             for row in clss:
                 if sum(row) > 1.0 or min(row) < 0.0 or max(row) > 1.0:

ciw/tests/test_process_based.py

@@ -45,6 +45,12 @@ def generator_function_8(ind):
         return [1]
     return [1, 1, 1]
 
+class ClassForProcessBasedMethod:
+    def __init__(self, n):
+        self.n = n
+    def generator_method(self, ind):
+        return [1, 1, 1]
+
 
 class TestProcessBased(unittest.TestCase):
     def test_network_takes_routing_function(self):
@@ -294,3 +300,19 @@ def test_customer_class_based_routing(self):
         inds = Q.nodes[-1].all_individuals
         routes_counter = set([tuple([ind.customer_class, tuple(dr.node for dr in ind.data_records)]) for ind in inds])
         self.assertEqual(routes_counter, {('Class 1', (1, 1, 1)), ('Class 0', (1,))})
+
+    def test_process_based_takes_methods(self):
+        import types
+        G = ClassForProcessBasedMethod(5)
+        self.assertTrue(isinstance(G.generator_method, types.MethodType))
+        N = ciw.create_network(
+            arrival_distributions=[ciw.dists.Deterministic(1)],
+            service_distributions=[ciw.dists.Deterministic(1000)],
+            number_of_servers=[1],
+            routing=[G.generator_method],
+        )
+        Q = ciw.Simulation(N)
+        Q.simulate_until_max_time(4.5)
+        inds = Q.nodes[1].all_individuals
+        for ind in inds:
+            self.assertEqual(ind.route, [1, 1, 1])

ciw/version.py

@@ -1 +1 @@
-__version__ = "3.1.2"
+__version__ = "3.1.3"