Implement more API

bffhd/session/mod.rs

@@ -0,0 +1,32 @@
+use std::sync::Arc;
+
+struct Inner {
+
+}
+impl Inner {
+    pub fn new() -> Self {
+        Self { }
+    }
+}
+
+#[derive(Clone)]
+pub struct SessionManager {
+    inner: Arc<Inner>,
+}
+impl SessionManager {
+    pub fn new() -> Self {
+        Self {
+            inner: Arc::new(Inner::new()),
+        }
+    }
+    pub fn open(&self, uid: impl AsRef<str>) -> Option<SessionHandle> {
+        unimplemented!()
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct SessionHandle {
+}
+
+impl SessionHandle {
+}