Allow sorting StateChange callbacks

If the key of the callback is a number, it will be used to invoke callbacks with the correct ordering.
FairRootGroup · Sep 6, 2023 · 3c1723f · 3c1723f
1 parent c3418cc
commit 3c1723f
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/fairmq/StateMachine.cxx b/fairmq/StateMachine.cxx
@@ -310,7 +310,9 @@ try {
 
 void StateMachine::SubscribeToStateChange(const string& key, function<void(const State)> callback)
 {
-    static_pointer_cast<FairMQFSM>(fFsm)->fStateChangeSignalsMap.insert({key, static_pointer_cast<FairMQFSM>(fFsm)->fStateChangeSignal.connect(callback)});
+    // Check if the key has a integer value as prefix, if yes, decode it.
+    int i = strtol(key.c_str(), nullptr, 10);
+    static_pointer_cast<FairMQFSM>(fFsm)->fStateChangeSignalsMap.insert({key, static_pointer_cast<FairMQFSM>(fFsm)->fStateChangeSignal.connect(i, callback)});
 }
 
 void StateMachine::UnsubscribeFromStateChange(const string& key)