diff --git a/control/templates/defs.mako b/control/templates/defs.mako
new file mode 100644
index 0000000..0980f81
--- /dev/null
+++ b/control/templates/defs.mako
@@ -0,0 +1,83 @@
+<%!
+def indent(str, depth):
+    return ''.join(4*' '*depth+line for line in str.splitlines(True))
+%>\
+
+<%def name="genHandler(sig)" buffered="True">
+%if ('type' in sig['sparams']) and \
+    (sig['sparams']['type'] is not None):
+${sig['signal']}<${sig['sparams']['type']}>(
+%else:
+${sig['signal']}(
+%endif
+%for spk in sig['sparams']['params']:
+${sig['sparams'][spk]},
+%endfor
+%if ('type' in sig['hparams']) and \
+    (sig['hparams']['type'] is not None):
+handler::${sig['handler']}<${sig['hparams']['type']}>(
+%else:
+handler::${sig['handler']}(
+%endif
+%for i, hpk in enumerate(sig['hparams']['params']):
+    %if (i+1) != len(sig['hparams']['params']):
+    ${sig['hparams'][hpk]},
+    %else:
+    ${sig['hparams'][hpk]}
+    %endif
+%endfor
+))
+</%def>\
+
+<%def name="genSSE(event)" buffered="True">
+Group{
+%for group in event['groups']:
+%for member in group['members']:
+{
+    "${member['object']}",
+    {"${member['interface']}",
+     "${member['property']}"}
+},
+%endfor
+%endfor
+},
+std::vector<Action>{
+%for a in event['action']:
+%if len(a['parameters']) != 0:
+make_action(action::${a['name']}(
+%else:
+make_action(action::${a['name']}
+%endif
+%for i, p in enumerate(a['parameters']):
+%if (i+1) != len(a['parameters']):
+    ${p},
+%else:
+    ${p})
+%endif
+%endfor
+),
+%endfor
+},
+Timer{
+    ${event['timer']['interval']},
+    ${event['timer']['type']}
+},
+std::vector<Signal>{
+%for s in event['signals']:
+    Signal{
+        match::${s['match']}(
+        %for i, mp in enumerate(s['mparams']):
+        %if (i+1) != len(s['mparams']):
+        "${mp}",
+        %else:
+        "${mp}"
+        %endif
+        %endfor
+        ),
+        make_handler(\
+        ${indent(genHandler(sig=s), 3)}\
+        )
+    },
+%endfor
+}
+</%def>\