[Init] Initial commit - NetMesh terminal manager

application/state/terminalHiddenRendererStore.ts

@@ -0,0 +1,55 @@
+type Listener = () => void;
+
+const softHiddenSessions = new Map<string, number>();
+const listeners = new Set<Listener>();
+let evictionRequestSessionId: string | null = null;
+
+function emit(): void {
+  listeners.forEach((listener) => listener());
+}
+
+export const terminalHiddenRendererStore = {
+  getSoftHiddenCount: () => softHiddenSessions.size,
+
+  isSoftHidden: (sessionId: string) => softHiddenSessions.has(sessionId),
+
+  markSoftHidden: (sessionId: string) => {
+    softHiddenSessions.set(sessionId, Date.now());
+    emit();
+  },
+
+  clearSoftHidden: (sessionId: string) => {
+    if (!softHiddenSessions.delete(sessionId)) return;
+    emit();
+  },
+
+  /** Returns the oldest soft-hidden session id when over the keep limit. */
+  pickEvictionCandidate: (keepCount: number): string | null => {
+    if (softHiddenSessions.size < keepCount) return null;
+    let oldestId: string | null = null;
+    let oldestTs = Number.POSITIVE_INFINITY;
+    for (const [sessionId, ts] of softHiddenSessions) {
+      if (ts < oldestTs) {
+        oldestTs = ts;
+        oldestId = sessionId;
+      }
+    }
+    return oldestId;
+  },
+
+  requestEviction: (sessionId: string) => {
+    evictionRequestSessionId = sessionId;
+    emit();
+  },
+
+  consumeEvictionRequest: (sessionId: string): boolean => {
+    if (evictionRequestSessionId !== sessionId) return false;
+    evictionRequestSessionId = null;
+    return true;
+  },
+
+  subscribe: (listener: Listener) => {
+    listeners.add(listener);
+    return () => listeners.delete(listener);
+  },
+};