async-task-mgr

Intro

A simple nodeJS module for async task manager. Identical tasks will be executed only once and the result will be saved for further use.

Features

• tasks with the same name are identified as the same, and will be executed only once
• task result will be saved for further use

How to use

npm install async-task-mgr --save

Sample

1var asyncTask = require("async-task-mgr");
2
3var asyncTaskInstance = new asyncTask();
4
5function taskAction(callback){
6	setTimeout(function(){ //simulate an async task
7		var resultA = Math.floor(Math.random()*100),
8			resultB = Math.floor(Math.random()*100),
9			resultC = Math.floor(Math.random()*100);
10
11		callback(resultA, resultB, resultC);
12	},2000); 
13}
14
15//add a new task named task_A
16//when taskAction is done, its return value will be saved and apply to all the task with the same name
17asyncTaskInstance.addTask("task_A",taskAction,function(resultA,resultB,resultC){ 
18	console.log("task A_1 result :" + resultA + " " + resultB + " " + resultC); //all result generated by taskAction will be passed here
19});
20
21
22//add a new task named task_A
23/*
24since a task with the same name has been added, this taskAction will not be executed.
25the callback function will be put in a queue and will be called when previous callbacks are done.
26*/
27asyncTaskInstance.addTask("task_A",taskAction,function(resultA,resultB,resultC){
28	console.log("task A_2 result :" + resultA + " " + resultB + " " + resultC);
29});
30
31
32//add a new task named task_X
33//a new task, have no relationship to the previous ones
34asyncTaskInstance.addTask("task_X",taskAction,function(resultA,resultB,resultC){
35	console.log("task X_0 result :" + resultA + " " + resultB + " " + resultC);
36});
37

Author

Otto Mao ottomao@gmail.com