import TaskManager from './TaskManager.js';
/**
 * TaskManagerRegistry
 *
 * A singleton registry to track active TaskManager instances, keyed by `jobId`.
 *
 * In a system where jobs are processed via isolated TaskManager instances,
 * this registry provides global visibility and control over running jobs
 * without violating encapsulation or spawning duplicates.
 *
 * ---------------------------------------------------------------------------------------
 * ✅ WHY THIS EXISTS:
 * ---------------------------------------------------------------------------------------
 * - Each `TaskManager` is designed to handle a single job at a time.
 * - The API (or other system components) should not create new instances blindly.
 * - Instead, they can **query the registry** for the job-specific TaskManager.
 * - This avoids duplicate execution and lets the system safely:
 *    - Pause/resume/stop jobs
 *    - Fetch logs or live state
 *    - Broadcast updates via WebSocket
 *
 * ---------------------------------------------------------------------------------------
 *  FUTURE USE CASES:
 * ---------------------------------------------------------------------------------------
 * - **Parallel Job Execution:**
 *   You’ll eventually support multiple jobs running at the same time (concurrently).
 *   This registry is the backbone for that. Each job gets its own `TaskManager`,
 *   but the registry keeps them accessible and uniquely identifiable.
 *
 * - **Safe Shutdown / Cleanup:**
 *   On server shutdown, loop through all managers via the registry
 *   and gracefully shut down active tasks.
 *
 * - Use `.register()` when starting a job
 * - Use `.remove()` once the job finishes (success/fail)
 * - `.get()` to safely access a manager by ID
 * - Singleton ensures the same instance is used everywhere
 */
export declare class TaskManagerRegistry {
    private static instance;
    private registry;
    private constructor();
    static getInstance(): TaskManagerRegistry;
    register(jobId: string, manager: TaskManager): void;
    get(jobId: string): TaskManager | undefined;
    remove(jobId: string): void;
    /** Jobs with a task manager, which is to say the jobs this node is running. */
    size(): number;
    has(jobId: string): boolean;
    stop(): Promise<void>;
}