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semaphore

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semaphore

semaphore for node


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decreased by-11.26%
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semaphore.js

Install: npm install semaphore

Limit simultaneous access to a resource.

// Create
var sem = require('semaphore')(capacity);

// Take
sem.take(fn[, n=1])
sem.take(n, fn)

// Leave
sem.leave([n])
// Limit concurrent db access
var sem = require('semaphore')(1);
var server = require('http').createServer(req, res) {
	sem.take(function() {
		expensive_database_operation(function(err, res) {
			sem.leave();

			if (err) return res.end("Error");

			return res.end(res);
		});
	});
});
// 2 clients at a time
var sem = require('semaphore')(2);
var server = require('http').createServer(req, res) {
	res.write("Then good day, madam!");

	sem.take(function() {
		res.end("We hope to see you soon for tea.");
		sem.leave();
	});
});
// Rate limit
var sem = require('semaphore')(10);
var server = require('http').createServer(req, res) {
	sem.take(function() {
		res.end(".");
		
		setTimeout(sem.leave, 500)
	});
});

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Package last updated on 05 Nov 2012

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