diff --git a/analysis/ros_processor.py b/analysis/ros_processor.py
new file mode 100644
index 0000000..cbd8d66
--- /dev/null
+++ b/analysis/ros_processor.py
@@ -0,0 +1,92 @@
+# Process trace events and create ROS model
+
+def ros_process(events):
+    """
+    Process unpickled events and create ROS model
+    :param events (list(dict(str:str:))): the list of events
+    """
+    processor = RosProcessor()
+    for event in events:
+        print(f'event: {str(event)}')
+        processor.handle(event)
+
+# TODO move
+class EventMetadata():
+    def __init__(self, event_name, pid, tid, timestamp, procname):
+        self._event_name = event_name
+        self._pid = pid
+        self._tid = tid
+        self._timestamp = timestamp
+        self._procname = procname
+
+    @property
+    def event_name(self):
+        return self._event_name
+
+    @property
+    def pid(self):
+        return self._pid
+
+    @property
+    def tid(self):
+        return self._tid
+
+    @property
+    def timestamp(self):
+        return self._timestamp
+
+    @property
+    def procname(self):
+        return self._procname
+
+
+class RosProcessor():
+    def __init__(self):
+        # TODO add other stuff
+        self.callbacks = []
+
+        # Link a ROS trace event to its corresponding handling method
+        self._handler_map = {
+            'ros2:rcl_subscription_init': self._handle_subscription_init,
+            'ros2:rclcpp_subscription_callback_added': self._handle_subscription_callback_added,
+            'ros2:rclcpp_subscription_callback_start': self._handle_subscription_callback_start,
+            'ros2:rclcpp_subscription_callback_end': self._handle_subscription_callback_end,
+        }
+    
+    def handle(self, event):
+        """
+        Handle an event
+        :param event (dict(str:str)): the event to handle
+        """
+        handler_function = self._handler_map.get(get_name(event), d=None)
+        if handler_function is not None:
+            name = get_name(event)
+            pid = get_field(event, 'vpid', default=get_field(event, 'pid'))
+            tid = get_field(event, 'vtid', default=get_field(event, 'tid'))
+            timestamp = get_field(event, '_timestamp')
+            procname = get_field(event, 'procname')
+            metadata = EventMetadata(name, pid, tid, timestamp, procname)
+            handler_function(event, metadata)
+
+    def _handle_subscription_init(self, event, metadata):
+        # TODO
+        pass
+
+    def _handle_subscription_callback_added(self, event, metadata):
+        # TODO
+        pass
+
+    def _handle_subscription_callback_start(self, event, metadata):
+        # TODO
+        pass
+
+    def _handle_subscription_callback_end(self, event, metadata):
+        # TODO
+        pass
+
+
+def get_field(event, field_name, default=None):
+    return event.get(field_name, d=default)
+
+def get_name(event):
+    return get_field(event, '_name')
diff --git a/conversion/ros.py b/conversion/ros.py
deleted file mode 100644
index b63b75b..0000000
--- a/conversion/ros.py
+++ /dev/null
@@ -1,5 +0,0 @@
-# Process trace events and create ROS model
-
-def ros_import(events):
-    for event in events:
-        print(f'event: {str(event)}')
diff --git a/process.py b/process.py
index 9752a44..fa576d1 100644
--- a/process.py
+++ b/process.py
@@ -3,7 +3,7 @@
 
 import sys
 import pickle
-from tracetools_analysis.conversion.ros import *
+from tracetools_analysis.analysis.ros import *
 
 def main(argv=sys.argv):
     if len(argv) != 2:
@@ -14,7 +14,7 @@ def main(argv=sys.argv):
     with open(pickle_filename, 'rb') as f:
         events = _get_events_from_pickled_file(f)
         print(f'imported {len(events)} events')
-        ros_import(events)
+        ros_process(events)
 
 def _get_events_from_pickled_file(file):
     p = pickle.Unpickler(file)