refactor(core): Centralize CronJob management (#10033)

packages/core/src/ScheduledTaskManager.ts

@@ -0,0 +1,31 @@
+import { Service } from 'typedi';
+import { CronJob } from 'cron';
+import type { CronExpression, Workflow } from 'n8n-workflow';
+
+@Service()
+export class ScheduledTaskManager {
+	readonly cronJobs = new Map<string, CronJob[]>();
+
+	registerCron(workflow: Workflow, cronExpression: CronExpression, onTick: () => void) {
+		const cronJob = new CronJob(cronExpression, onTick, undefined, true, workflow.timezone);
+		const cronJobsForWorkflow = this.cronJobs.get(workflow.id);
+		if (cronJobsForWorkflow) {
+			cronJobsForWorkflow.push(cronJob);
+		} else {
+			this.cronJobs.set(workflow.id, [cronJob]);
+		}
+	}
+
+	deregisterCrons(workflowId: string) {
+		const cronJobs = this.cronJobs.get(workflowId) ?? [];
+		for (const cronJob of cronJobs) {
+			cronJob.stop();
+		}
+	}
+
+	deregisterAllCrons() {
+		for (const workflowId of Object.keys(this.cronJobs)) {
+			this.deregisterCrons(workflowId);
+		}
+	}
+}