import * as plugins from './taskbuffer.plugins'; import { BufferRunner } from './taskbuffer.classes.bufferrunner'; import { CycleCounter } from './taskbuffer.classes.cyclecounter'; import { logger } from './taskbuffer.logging'; export interface ITaskFunction { (x?: any): PromiseLike; } export type TPreOrAfterTaskFunction = () => Task; export class Task { // STATIC public static extractTask(preOrAfterTaskArg: Task | TPreOrAfterTaskFunction): Task { switch (true) { case !preOrAfterTaskArg: return null; case preOrAfterTaskArg instanceof Task: return preOrAfterTaskArg as Task; case typeof preOrAfterTaskArg === 'function': const taskFunction = preOrAfterTaskArg as TPreOrAfterTaskFunction; return taskFunction(); default: return null; } } public static emptyTaskFunction: ITaskFunction = function (x) { const done = plugins.smartpromise.defer(); done.resolve(); return done.promise; }; public static isTask = (taskArg: Task): boolean => { if (taskArg instanceof Task && typeof taskArg.taskFunction === 'function') { return true; } else { return false; } }; public static isTaskTouched = ( taskArg: Task | TPreOrAfterTaskFunction, touchedTasksArray: Task[] ): boolean => { const taskToCheck = Task.extractTask(taskArg); let result = false; for (const keyArg in touchedTasksArray) { if (taskToCheck === touchedTasksArray[keyArg]) { result = true; } } return result; }; public static runTask = async ( taskArg: Task | TPreOrAfterTaskFunction, optionsArg: { x?: any; touchedTasksArray?: Task[] } ) => { // extracts the task in case it is specified as a return value of a function const taskToRun = Task.extractTask(taskArg); const done = plugins.smartpromise.defer(); // pay respect to execDelay if (taskToRun.execDelay) { await plugins.smartdelay.delayFor(taskToRun.execDelay); } // set running params taskToRun.running = true; done.promise.then(async () => { taskToRun.running = false; }); // handle options const options = { ...{ x: undefined, touchedTasksArray: [] }, ...optionsArg, }; const x = options.x; const touchedTasksArray: Task[] = options.touchedTasksArray; touchedTasksArray.push(taskToRun); // run the task cascade const localDeferred = plugins.smartpromise.defer(); localDeferred.promise .then(() => { // lets run any preTask if (taskToRun.preTask && !Task.isTaskTouched(taskToRun.preTask, touchedTasksArray)) { return Task.runTask(taskToRun.preTask, { x, touchedTasksArray }); } else { const done2 = plugins.smartpromise.defer(); done2.resolve(x); return done2.promise; } }) .then(async (x) => { // lets run the main task try { return await taskToRun.taskFunction(x); } catch (e) { console.log(e); } }) .then((x) => { if (taskToRun.afterTask && !Task.isTaskTouched(taskToRun.afterTask, touchedTasksArray)) { return Task.runTask(taskToRun.afterTask, { x: x, touchedTasksArray: touchedTasksArray }); } else { const done2 = plugins.smartpromise.defer(); done2.resolve(x); return done2.promise; } }) .then((x) => { done.resolve(x); }) .catch((err) => { console.log(err); }); localDeferred.resolve(); return await done.promise; }; // INSTANCE // mandatory properties public name: string; public taskFunction: ITaskFunction; public buffered: boolean; public cronJob: plugins.smarttime.CronJob; public bufferMax: number; public execDelay: number; // tasks to run before and after public preTask: Task | TPreOrAfterTaskFunction; public afterTask: Task | TPreOrAfterTaskFunction; // initialize by default public running: boolean = false; public bufferRunner = new BufferRunner(this); public cycleCounter = new CycleCounter(this); public idle: boolean = true; private _state: string = 'ready'; constructor(optionsArg: { /** * the task function to run, must return promise */ taskFunction: ITaskFunction; /** * any other task to run before */ preTask?: Task | TPreOrAfterTaskFunction; /** * any other task to run after */ afterTask?: Task | TPreOrAfterTaskFunction; /** * wether this task should run buffered */ buffered?: boolean; /** * the maximum buffer */ bufferMax?: number; /** * the execution delay, before the task is executed * only makes sense when running in buffered mode */ execDelay?: number; /** * the name of the task */ name?: string; }) { this.taskFunction = optionsArg.taskFunction; this.preTask = optionsArg.preTask; this.afterTask = optionsArg.afterTask; this.idle = !this.running; this.buffered = optionsArg.buffered; this.bufferMax = optionsArg.bufferMax; this.execDelay = optionsArg.execDelay; this.name = optionsArg.name; } /** * trigger the task. Will trigger buffered if this.buffered is true */ public trigger(x?: any): Promise { if (this.buffered) { return this.triggerBuffered(x); } else { return this.triggerUnBuffered(x); } } /** * trigger task unbuffered. * will actually run the task, not considering any buffered limits. */ public triggerUnBuffered(x?: any): Promise { return Task.runTask(this, { x: x }); } /** * trigger task buffered. * note: .trigger() also calls this function */ public triggerBuffered(x?: any): Promise { return this.bufferRunner.trigger(x); } get state(): string { return this._state; } set state(stateArg: string) { if (stateArg === 'locked') { this._state = 'locked'; } else { logger.log('error', `state type ${stateArg} could not be set`); } } }