in midst of refactor

orchid-extension/src/extension.rs

@@ -0,0 +1,30 @@
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::Arc;
+
+use orchid_api::proto::{ExtMsgSet, ExtensionHeader, HostExtNotif, HostExtReq, HostHeader};
+use orchid_api_traits::{Decode, Encode};
+use ordered_float::NotNan;
+
+use crate::child::{recv_parent_msg, send_parent_msg};
+use crate::clone;
+use crate::intern::{init_replica, sweep_replica};
+use crate::reqnot::{ReqNot, Requester as _};
+
+pub struct SystemParams {
+  deps: Vec<SystemHandle>,
+  
+}
+
+pub struct SystemCtor {
+  deps: Vec<String>,
+  make: Box<dyn FnMut(SystemParams) -> System>,
+  name: String,
+  prio: NotNan<f64>,
+  dependencies: Vec<String>,
+}
+
+pub struct ExtensionData {
+  systems: Vec<SystemCtor>
+}
+
+