perf(core): Introduce concurrency control for main mode (#9453)

packages/cli/src/concurrency/concurrency-queue.ts

@@ -0,0 +1,59 @@
+import { Service } from 'typedi';
+import { EventEmitter } from 'node:events';
+
+@Service()
+export class ConcurrencyQueue extends EventEmitter {
+	private readonly queue: Array<{
+		executionId: string;
+		resolve: () => void;
+	}> = [];
+
+	constructor(private capacity: number) {
+		super();
+	}
+
+	async enqueue(executionId: string) {
+		this.capacity--;
+
+		if (this.capacity < 0) {
+			this.emit('execution-throttled', { executionId, capacity: this.capacity });
+
+			// eslint-disable-next-line @typescript-eslint/return-await
+			return new Promise<void>((resolve) => this.queue.push({ executionId, resolve }));
+		}
+	}
+
+	dequeue() {
+		this.capacity++;
+
+		this.resolveNext();
+	}
+
+	remove(executionId: string) {
+		const index = this.queue.findIndex((item) => item.executionId === executionId);
+
+		if (index > -1) {
+			this.queue.splice(index, 1);
+
+			this.capacity++;
+
+			this.resolveNext();
+		}
+	}
+
+	getAll() {
+		return new Set(...this.queue.map((item) => item.executionId));
+	}
+
+	private resolveNext() {
+		const item = this.queue.shift();
+
+		if (!item) return;
+
+		const { resolve, executionId } = item;
+
+		this.emit('execution-released', executionId);
+
+		resolve();
+	}
+}