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* Pin State Batching Layer
*
* Batches high-frequency pin state changes into lower-frequency batches
* to reduce WebSocket message overhead (2000 msg/sec → 20 msg/sec).
*
* Key Features:
* - Tick-based batching (default 50ms = 20 batches/sec)
* - "Last value wins" deduplication per pin:stateType
* - Telemetry tracking (intended vs actual pin changes)
* - Pause/Resume support
* - Flush on stop
*/
import type { PinStateChange } from "@shared/types/arduino.types";
export interface PinStateEvent {
pin: number;
stateType: PinStateChange;
value: number;
}
export interface PinStateBatch {
states: PinStateEvent[];
timestamp: number;
}
interface PinStateBatcherConfig {
/** Tick interval in milliseconds (default: 50ms = 20 batches/sec) */
tickIntervalMs?: number;
/** Callback invoked with each batch */
onBatch: (batch: PinStateBatch) => void;
}
export class PinStateBatcher {
private readonly config: Required<PinStateBatcherConfig>;
private readonly pendingStates = new Map<string, PinStateEvent>();
private tickTimer: NodeJS.Timeout | null = null;
private intendedCount = 0;
private actualCount = 0;
private batchCount = 0;
constructor(config: PinStateBatcherConfig) {
this.config = {
tickIntervalMs: config.tickIntervalMs ?? 50,
onBatch: config.onBatch,
};
}
/**
* Enqueue a pin state change.
* Called for every pin change from the simulator (~2000/sec).
*/
enqueue(pin: number, stateType: PinStateChange, value: number): void {
const key = `${pin}:${stateType}`;
this.pendingStates.set(key, { pin, stateType, value });
this.intendedCount++;
}
/**
* Start the tick timer to begin batching.
*/
start(): void {
Iif (this.tickTimer) {
return; // Already started
}
this.tickTimer = setInterval(() => this.tick(), this.config.tickIntervalMs);
}
/**
* Stop the tick timer and flush any remaining pending states.
*/
stop(): void {
Eif (this.tickTimer) {
clearInterval(this.tickTimer);
this.tickTimer = null;
}
// Flush remaining states
this.flush();
}
/**
* Pause ticking (keep pending states, stop timer).
*/
pause(): void {
Eif (this.tickTimer) {
clearInterval(this.tickTimer);
this.tickTimer = null;
}
// Do NOT flush - keep pending states
}
/**
* Resume ticking after pause.
*/
resume(): void {
this.start();
}
/**
* Get telemetry counters and reset them.
*/
getTelemetryAndReset(): { intended: number; actual: number; batches: number } {
const result = {
intended: this.intendedCount,
actual: this.actualCount,
batches: this.batchCount,
};
this.intendedCount = 0;
this.actualCount = 0;
this.batchCount = 0;
return result;
}
/**
* Destroy the batcher, stop timer, discard pending states.
*/
destroy(): void {
if (this.tickTimer) {
clearInterval(this.tickTimer);
this.tickTimer = null;
}
this.pendingStates.clear();
}
/**
* Tick handler: send batch if there are pending states.
*/
private tick(): void {
this.flush();
}
/**
* Flush pending states as a batch.
*/
private flush(): void {
if (this.pendingStates.size === 0) {
return;
}
const states = Array.from(this.pendingStates.values());
this.pendingStates.clear();
this.actualCount += states.length;
this.config.onBatch({
states,
timestamp: Date.now(),
});
this.batchCount++;
}
}
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