resig.js
Version:
Universal reactive signal library with complete platform features: signals, animations, CRDTs, scheduling, DOM integration. Works identically across React, SolidJS, Svelte, Vue, and Qwik.
343 lines • 24 kB
JavaScript
/**
* Scheduler - Stream coalgebra for managing async operations and animations
* Following coalgebraic principles for time-evolving systems
*/
import { signal } from '../core/signal';
// Task priority levels
export var Priority;
(function (Priority) {
Priority[Priority["IMMEDIATE"] = 0] = "IMMEDIATE";
Priority[Priority["HIGH"] = 1] = "HIGH";
Priority[Priority["NORMAL"] = 2] = "NORMAL";
Priority[Priority["LOW"] = 3] = "LOW";
Priority[Priority["IDLE"] = 4] = "IDLE";
})(Priority || (Priority = {}));
// Task queue implementation with priority
class TaskQueue {
constructor() {
this.queues = new Map();
this.taskMap = new Map();
// Initialize priority queues
Object.values(Priority).forEach((priority) => {
if (typeof priority === 'number') {
this.queues.set(priority, []);
}
});
}
enqueue(task) {
const queue = this.queues.get(task.priority);
if (queue) {
queue.push(task);
this.taskMap.set(task.id, task);
}
}
dequeue() {
// Process tasks by priority (lower number = higher priority)
for (const priority of [
Priority.IMMEDIATE,
Priority.HIGH,
Priority.NORMAL,
Priority.LOW,
Priority.IDLE,
]) {
const queue = this.queues.get(priority);
if (queue && queue.length > 0) {
const task = queue.shift();
this.taskMap.delete(task.id);
return task;
}
}
return null;
}
remove(taskId) {
const task = this.taskMap.get(taskId);
if (!task)
return false;
const queue = this.queues.get(task.priority);
if (queue) {
const index = queue.findIndex((t) => t.id === taskId);
if (index !== -1) {
queue.splice(index, 1);
this.taskMap.delete(taskId);
return true;
}
}
return false;
}
clear() {
this.queues.forEach((queue) => (queue.length = 0));
this.taskMap.clear();
}
get size() {
return this.taskMap.size;
}
}
// Main scheduler implementation
export const scheduler = () => {
const taskQueue = new TaskQueue();
const delayedTasks = new Map(); // taskId -> timeoutId
const repeatingTasks = new Map(); // taskId -> repeat info
let isRunning = false;
let animationFrameId = null;
let completedCount = 0;
let failedCount = 0;
const stateSignal = signal({
running: false,
taskCount: 0,
completedTasks: 0,
failedTasks: 0,
});
const updateState = () => {
stateSignal._set({
running: isRunning,
taskCount: taskQueue.size + delayedTasks.size,
completedTasks: completedCount,
failedTasks: failedCount,
});
};
const processTask = async (task) => {
try {
await task.execute();
completedCount++;
// Handle repeating tasks
if (task.repeat) {
const repeatInfo = repeatingTasks.get(task.id);
if (repeatInfo) {
if (typeof task.repeat === 'number') {
repeatInfo.remaining--;
if (repeatInfo.remaining <= 0) {
repeatingTasks.delete(task.id);
return;
}
}
// Reschedule the task
if (task.delay) {
const timeoutId = window.setTimeout(() => {
delayedTasks.delete(task.id);
taskQueue.enqueue(task);
updateState();
}, task.delay);
delayedTasks.set(task.id, timeoutId);
}
else {
taskQueue.enqueue(task);
}
}
}
}
catch (error) {
console.error(`Task ${task.id} failed:`, error);
failedCount++;
// Cancel task if it has a cancel handler
if (task.cancel) {
try {
task.cancel();
}
catch (cancelError) {
console.error(`Task ${task.id} cancel failed:`, cancelError);
}
}
}
updateState();
};
const tick = () => {
if (!isRunning)
return;
const task = taskQueue.dequeue();
if (task) {
processTask(task);
}
updateState();
if (isRunning) {
animationFrameId = requestAnimationFrame(tick);
}
};
const instance = {
state: stateSignal,
schedule: (task) => {
const taskId = task.id ||
`task-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
const taskWithId = { ...task, id: taskId };
// Handle repeating tasks
if (task.repeat) {
const remaining = typeof task.repeat === 'number' ? task.repeat : Infinity;
repeatingTasks.set(taskId, { task: taskWithId, remaining });
}
// Handle delayed tasks
if (task.delay && task.delay > 0) {
const timeoutId = window.setTimeout(() => {
delayedTasks.delete(taskId);
taskQueue.enqueue(taskWithId);
updateState();
}, task.delay);
delayedTasks.set(taskId, timeoutId);
}
else {
taskQueue.enqueue(taskWithId);
}
updateState();
return taskId;
},
cancel: (taskId) => {
// Cancel delayed task
const timeoutId = delayedTasks.get(taskId);
if (timeoutId) {
clearTimeout(timeoutId);
delayedTasks.delete(taskId);
repeatingTasks.delete(taskId);
updateState();
return true;
}
// Cancel queued task
const removed = taskQueue.remove(taskId);
if (removed) {
repeatingTasks.delete(taskId);
updateState();
return true;
}
return false;
},
start: () => {
if (isRunning)
return;
isRunning = true;
updateState();
tick();
},
stop: () => {
if (!isRunning)
return;
isRunning = false;
if (animationFrameId) {
cancelAnimationFrame(animationFrameId);
animationFrameId = null;
}
updateState();
},
clear: () => {
// Cancel all delayed tasks
delayedTasks.forEach((timeoutId) => clearTimeout(timeoutId));
delayedTasks.clear();
// Clear all queues
taskQueue.clear();
repeatingTasks.clear();
// Reset counters
completedCount = 0;
failedCount = 0;
updateState();
},
};
return instance;
};
// Global scheduler instance
let globalScheduler = null;
export const getGlobalScheduler = () => {
if (!globalScheduler) {
globalScheduler = scheduler();
globalScheduler.start(); // Auto-start global scheduler
}
return globalScheduler;
};
// Convenience functions using global scheduler
export const schedule = (task) => {
const taskId = task.id || `task-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
return getGlobalScheduler().schedule({ ...task, id: taskId });
};
export const cancel = (taskId) => {
return getGlobalScheduler().cancel(taskId);
};
export const delay = (ms) => {
return new Promise((resolve) => {
schedule({
priority: Priority.NORMAL,
execute: resolve,
delay: ms,
});
});
};
export const nextFrame = () => {
return new Promise((resolve) => {
schedule({
priority: Priority.HIGH,
execute: resolve,
});
});
};
export const idle = (callback) => {
return schedule({
priority: Priority.IDLE,
execute: callback,
});
};
// Animation utilities
export const animate = (duration, callback, easing = (t) => t) => {
const startTime = performance.now();
const taskId = schedule({
priority: Priority.HIGH,
repeat: true,
execute: () => {
const elapsed = performance.now() - startTime;
const progress = Math.min(elapsed / duration, 1);
const easedProgress = easing(progress);
callback(easedProgress);
if (progress >= 1) {
cancel(taskId);
}
},
});
return taskId;
};
// Debounce utility using scheduler
export const debounce = (fn, delay) => {
let taskId = null;
const debouncedFn = ((...args) => {
if (taskId) {
cancel(taskId);
}
taskId = schedule({
priority: Priority.NORMAL,
delay,
execute: () => fn(...args),
});
});
debouncedFn.cancel = () => {
if (taskId) {
cancel(taskId);
taskId = null;
}
};
return debouncedFn;
};
// Throttle utility using scheduler
export const throttle = (fn, delay) => {
let lastExecution = 0;
let taskId = null;
const throttledFn = ((...args) => {
const now = performance.now();
const timeSinceLastExecution = now - lastExecution;
if (timeSinceLastExecution >= delay) {
lastExecution = now;
fn(...args);
}
else if (!taskId) {
const remainingDelay = delay - timeSinceLastExecution;
taskId = schedule({
priority: Priority.NORMAL,
delay: remainingDelay,
execute: () => {
lastExecution = performance.now();
fn(...args);
taskId = null;
},
});
}
});
throttledFn.cancel = () => {
if (taskId) {
cancel(taskId);
taskId = null;
}
};
return throttledFn;
};
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