dd

extensions/Excel转JSON/node_modules/atomically/src/utils/scheduler.ts

@@ -0,0 +1,60 @@
+
+/* IMPORT */
+
+import {Disposer} from '../types';
+
+/* VARIABLES */
+
+const Queues: Record<string, Function[] | undefined> = {};
+
+/* SCHEDULER */
+
+//TODO: Maybe publish this as a standalone package
+
+const Scheduler = {
+
+  next: ( id: string ): void => {
+
+    const queue = Queues[id];
+
+    if ( !queue ) return;
+
+    queue.shift ();
+
+    const job = queue[0];
+
+    if ( job ) {
+
+      job ( () => Scheduler.next ( id ) );
+
+    } else {
+
+      delete Queues[id];
+
+    }
+
+  },
+
+  schedule: ( id: string ): Promise<Disposer> => {
+
+    return new Promise ( resolve => {
+
+      let queue = Queues[id];
+
+      if ( !queue ) queue = Queues[id] = [];
+
+      queue.push ( resolve );
+
+      if ( queue.length > 1 ) return;
+
+      resolve ( () => Scheduler.next ( id ) );
+
+    });
+
+  }
+
+};
+
+/* EXPORT */
+
+export default Scheduler;