https://github.com/dresende/node-butler

A simple asynchronous chaining butler
https://github.com/dresende/node-butler

Last synced: 11 months ago
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A simple asynchronous chaining butler

• Host: GitHub
• URL: https://github.com/dresende/node-butler
• Owner: dresende
• Created: 2011-08-11T11:49:54.000Z (over 14 years ago)
• Default Branch: master
• Last Pushed: 2011-08-18T13:05:33.000Z (over 14 years ago)
• Last Synced: 2025-01-02T02:44:39.602Z (about 1 year ago)
• Language: JavaScript
• Homepage: http://dresende.github.com/node-butler/
• Size: 145 KB
• Stars: 1
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
## Node Butler

This module helps when you need to call several asynchronous calls one after each other.

## Install

    npm install butler

## Example

    var fs = require("fs"),

    Butler = require("./../lib/butler").Butler;

    // fs.readFile()

    function readFileAsync(filename, cb) {

      var Alfred = new Butler();

      Alfred

      .add(fs.open, filename, "r")

      .store("fd")

      .chain(fs.fstat)

      .wait(function (err, stats) {

        if (err) { cb(err); return false; }

        // Alfred.storage.fd was saved previously using .store("fd", [ param index = 0])

        Alfred.storage.size = stats.size;

        Alfred

        .add(fs.read, Alfred.storage.fd, new Buffer(Alfred.storage.size), 0, Alfred.storage.size, 0)

        .wait(function (err, size, data) {

          if (err) { cb(err); return false; }

          Alfred.storage.data = data;

        })

        .add(fs.close, Alfred.storage.fd)

        .wait(function (err) {

          if (err) { cb(err); return false; }

          cb(null, Alfred.storage.data);

        });

      });

    }

    readFileAsync(__dirname + "/fs.js", function (err, data) {

      if (err) {

        return console.log("error reading file", err);

      }

      console.log("FILE\n-------------------------");

      console.log(data);

      console.log("-------------------------");

    });