async scheduler 1

solutions/async-scheduler.js

@@ -0,0 +1,53 @@
+class TaskScheduler {
+  constructor(concurrency = 1) {
+    this.queue = [];
+    this.isProcessing = false;
+    this.concurrencyLimit = concurrency;
+    this.runningCount = 0;
+  }
+  
+  addTask(taskFn) {
+    const { promise, resolve, reject } = Promise.withResolvers();
+    this.queue.push({
+      taskFn,
+      resolve,
+      reject,
+    });
+
+    this._processQueue();
+    return promise;
+  }
+
+  _processQueue() {
+    if (!this.isProcessing) return;
+
+    while (this.runningCount < this.concurrencyLimit && this.queue.length > 0) {
+      const {
+        taskFn,
+        resolve,
+        reject,
+      } = this.queue.shift();
+
+      this.runningCount++;
+
+      // Ensure taskFn errors are captured as rejections
+      const taskPromise = Promise.resolve().then(() => taskFn());
+      taskPromise.then(resolve, reject);
+      taskPromise.finally(() => {
+        this.runningCount--;
+        this._processQueue();
+      });
+    }
+  }
+
+  play(){
+    this.isProcessing = true;
+    this._processQueue();
+  }
+
+  pause(){
+    this.isProcessing = false;
+  }
+}
+
+module.exports = TaskScheduler;