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// Manages simulation execution timeout with pause/resume support
import { Logger } from "@shared/logger";
type TimeoutCallback = () => void;
interface SimulationTimeoutManagerConfig {
onTimeout?: TimeoutCallback;
}
/**
* SimulationTimeoutManager handles execution timeout logic with pause/resume support.
* Ensures no zombie timers remain after stop() and correctly calculates remaining time.
*/
export class SimulationTimeoutManager {
private timeoutHandle: NodeJS.Timeout | null = null;
private timeoutDeadlineMs: number | null = null;
private pausedRemainingMs: number | null = null;
private callback: TimeoutCallback | null = null;
private isPaused = false;
private isActive = false;
private readonly logger = new Logger("TimeoutManager");
constructor(config: SimulationTimeoutManagerConfig = {}) {
if (config.onTimeout) {
this.callback = config.onTimeout;
}
}
/**
* Schedule a timeout with the given duration in milliseconds.
* If timeoutMs is null, no timeout is scheduled (infinite execution).
*
* @param timeoutMs - Timeout duration in milliseconds, or null for infinite
* @param callback - Callback to execute when timeout occurs
*/
schedule(timeoutMs: number | null, callback: TimeoutCallback): void {
// Clear any existing timeout first
this.clear();
if (timeoutMs === null || timeoutMs <= 0) {
this.logger.debug("No timeout scheduled (infinite execution)");
return;
}
this.callback = callback;
this.timeoutDeadlineMs = Date.now() + timeoutMs;
this.isActive = true;
this.isPaused = false;
this.timeoutHandle = setTimeout(() => {
this.logger.debug("Timeout reached - executing callback");
this.isActive = false;
this.timeoutHandle = null;
Eif (this.callback) {
this.callback();
}
}, timeoutMs);
this.logger.debug(
`Timeout scheduled: ${timeoutMs}ms (deadline: ${this.timeoutDeadlineMs})`,
);
}
/**
* Pause the timeout clock. Calculates and stores remaining time.
* Returns the remaining time in milliseconds, or null if no timeout is active.
*/
pause(): number | null {
if (!this.isActive || this.isPaused) {
this.logger.debug("Pause ignored - not active or already paused");
return null;
}
Iif (!this.timeoutDeadlineMs) {
this.logger.debug("Pause ignored - no deadline set");
return null;
}
// Calculate remaining time before clearing timer
const now = Date.now();
const remaining = Math.max(0, this.timeoutDeadlineMs - now);
this.pausedRemainingMs = remaining;
this.isPaused = true;
// Clear the active timer to stop it from firing
Eif (this.timeoutHandle) {
clearTimeout(this.timeoutHandle);
this.timeoutHandle = null;
}
this.logger.debug(`Timeout paused - ${remaining}ms remaining`);
return remaining;
}
/**
* Resume the timeout clock with the remaining time.
* Returns true if resume was successful, false otherwise.
*/
resume(): boolean {
if (!this.isActive || !this.isPaused) {
this.logger.debug("Resume ignored - not active or not paused");
return false;
}
Iif (this.pausedRemainingMs === null || this.pausedRemainingMs <= 0) {
this.logger.debug("Resume ignored - no remaining time");
// Timeout already expired
if (this.callback) {
this.callback();
}
this.clear();
return false;
}
const remainingMs = this.pausedRemainingMs;
this.pausedRemainingMs = null;
this.isPaused = false;
// Schedule new timeout with remaining time
this.timeoutDeadlineMs = Date.now() + remainingMs;
this.timeoutHandle = setTimeout(() => {
this.logger.debug("Timeout reached after resume - executing callback");
this.isActive = false;
this.timeoutHandle = null;
Eif (this.callback) {
this.callback();
}
}, remainingMs);
this.logger.debug(`Timeout resumed - ${remainingMs}ms remaining`);
return true;
}
/**
* Stop and clear the timeout. Prevents any zombie timers.
* This is the critical method for preventing memory leaks.
*/
clear(): void {
if (this.timeoutHandle) {
clearTimeout(this.timeoutHandle);
this.timeoutHandle = null;
this.logger.debug("Timeout cleared");
}
this.timeoutDeadlineMs = null;
this.pausedRemainingMs = null;
this.isActive = false;
this.isPaused = false;
// Note: We keep the callback reference for reuse
}
/**
* Get the remaining time in milliseconds.
* Returns null if no timeout is active.
*/
getRemainingMs(): number | null {
if (!this.isActive) {
return null;
}
if (this.isPaused) {
return this.pausedRemainingMs;
}
Iif (!this.timeoutDeadlineMs) {
return null;
}
const now = Date.now();
return Math.max(0, this.timeoutDeadlineMs - now);
}
/**
* Check if timeout is currently active (scheduled and not expired).
*/
isTimeoutActive(): boolean {
return this.isActive;
}
/**
* Check if timeout is currently paused.
*/
isTimeoutPaused(): boolean {
return this.isPaused;
}
/**
* Update the timeout callback.
*/
setCallback(callback: TimeoutCallback): void {
this.callback = callback;
}
}
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