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async-stack

v1.6.0

Published

Async-to-sync queue stack process management - the simplest way possible.

Downloads

3

Readme

async-stack

Async-to-sync queue stack process management - the simplest way possible.

Install: npm install async-stack

Usage:

	// ADD THE MODULE
	var asyncstack = require("async-stack"),  // A Class allowing multiple independent instances.
		Stack = new asyncstack(), // this instance of 'asyncstack'.
		self = this,
		self.sql = {};

	// BUILD THE STACK
	Stack.push(
		function(){
			// On this one, don't call 'next()' until end of inside the mysql callback!
			mysql.query('select some_data from some_table', function(err, result, fields){
				if (err) { throw err; return; }

				// Make the result accessible to the rest of this page
				self.sql.sql1 = result;
				// This would be something like:
				// {
				//		companyname: 'Stack Devs, LLC',
				//		firstname: 'John',
				//		lastname: 'Smith',
				// }

				// NOTE: We passed 'false' 2nd param to Stack.push()
				// Manually call next now that we are ready.
				Stack.next();
			});
		}
		,false  // Passing second param [false] prevents auto-call of .next(), now it must be called manually!
	);
	Stack.push(
		function(){
			// Header
			var header_html = "<!DOCTYPE html><html><head></head><body><header><div class="bold"><span class="data_companyname">{{companyname}}</span></div><br /><br />Welcome, <span class="data_firstname">{{firstname}}</span></header><section>"; // Get/Set your hearder html somehow
			// Then parse/template/dynamic content from sql1 into the html
			// ...
			// ...

			response.write(header_html);
		}
	);
	Stack.push(
		function(){
			// body content
			var body_html = "<b>This would be page header content!</b>"; // Get/Set your hearder html somehow

			// then parse/template/dynamic content with some middleware to insert data from sql1 into the html

			response.write(body_html);
		}
	);
	Stack.push(
		function(){
			// Footer
			var footer_html = "</section><footer>&copy;<span class="data_companyname">{{companyname}}</span> All rights reserved. "; // Get/Set your hearder html somehow
			// Then parse/template/dynamic content from sql1 into the html
			// ...
			// ...

			response.write(footer_html);
		}
	);
	Stack.pushfinish(
		function(){
			response.end();
		}
	);


	// NOTES:
	// There are two additional features, following traditional array handling:
	//  'unshift()' = pre-pend a function to the front/top of the main stack
	//  'unshiftfinish()' = pre-pend a function to the front/top of the finish stack

	// Read the asycn-stack.js code for a number of additional accessors to get the stask lengths,
	//  the current index, isstarted, and isfinished flags of your stack.


	// Make it all happen!
	// Trigger the Stack calls
	Stack.start();


	// Now, go make it better.