[Init] Initial commit - NetMesh terminal manager

application/state/terminalReconnectRegistry.ts

@@ -0,0 +1,57 @@
+type TerminalReconnectHandler = () => void;
+
+export const createTerminalReconnectRegistry = () => {
+  const handlers = new Map<string, TerminalReconnectHandler>();
+  const pendingRequests = new Set<string>();
+  const activeSessionIds = new Set<string>();
+  const listeners = new Set<() => void>();
+
+  const emit = () => {
+    for (const listener of listeners) listener();
+  };
+
+  const setActive = (sessionId: string, active: boolean): void => {
+    const changed = active
+      ? !activeSessionIds.has(sessionId)
+      : activeSessionIds.has(sessionId);
+    if (!changed) return;
+    if (active) activeSessionIds.add(sessionId);
+    else activeSessionIds.delete(sessionId);
+    emit();
+  };
+
+  const isActive = (sessionId: string): boolean => activeSessionIds.has(sessionId);
+
+  const subscribe = (listener: () => void): (() => void) => {
+    listeners.add(listener);
+    return () => listeners.delete(listener);
+  };
+
+  const register = (sessionId: string, handler: TerminalReconnectHandler): (() => void) => {
+    handlers.set(sessionId, handler);
+    if (pendingRequests.delete(sessionId)) {
+      handler();
+    }
+    return () => {
+      if (handlers.get(sessionId) === handler) {
+        handlers.delete(sessionId);
+        setActive(sessionId, false);
+      }
+    };
+  };
+
+  const request = (sessionId: string): boolean => {
+    if (isActive(sessionId)) return false;
+    const handler = handlers.get(sessionId);
+    if (!handler) {
+      pendingRequests.add(sessionId);
+      return true;
+    }
+    handler();
+    return true;
+  };
+
+  return { register, request, setActive, isActive, subscribe };
+};
+
+export const terminalReconnectRegistry = createTerminalReconnectRegistry();