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The qlobber npm package is a fast and flexible topic-based publish/subscribe library for Node.js. It allows you to match topics to subscribers using a trie-based approach, which is efficient and scalable. This package is particularly useful for implementing message brokers, event emitters, and other pub/sub systems.
Basic Topic Matching
This feature allows you to add topics and match them against patterns. The code sample demonstrates how to add topics and retrieve matches for specific topics.
const Qlobber = require('qlobber').Qlobber;
let matcher = new Qlobber();
matcher.add('foo.*', 'it matches foo.bar');
matcher.add('foo.*', 'it also matches foo.baz');
matcher.add('foo.bar', 'it matches foo.bar exactly');
console.log(matcher.match('foo.bar')); // ['it matches foo.bar', 'it matches foo.bar exactly']
console.log(matcher.match('foo.baz')); // ['it also matches foo.baz']
Removing Topics
This feature allows you to remove specific topics from the matcher. The code sample demonstrates how to add and then remove a topic, showing the updated matches.
const Qlobber = require('qlobber').Qlobber;
let matcher = new Qlobber();
matcher.add('foo.*', 'it matches foo.bar');
matcher.add('foo.bar', 'it matches foo.bar exactly');
matcher.remove('foo.bar', 'it matches foo.bar exactly');
console.log(matcher.match('foo.bar')); // ['it matches foo.bar']
Wildcard Matching
This feature supports wildcard matching using '*' and '#' symbols. The code sample demonstrates how to use wildcards to match multiple topics.
const Qlobber = require('qlobber').Qlobber;
let matcher = new Qlobber();
matcher.add('foo.*', 'it matches foo.bar');
matcher.add('foo.#', 'it matches foo.bar and foo.baz');
console.log(matcher.match('foo.bar')); // ['it matches foo.bar', 'it matches foo.bar and foo.baz']
console.log(matcher.match('foo.baz.qux')); // ['it matches foo.bar and foo.baz']
The mqtt package is a client library for the MQTT protocol, which is a lightweight messaging protocol for small sensors and mobile devices. It provides similar pub/sub functionality but is more focused on network communication and IoT applications. Unlike qlobber, mqtt is protocol-specific and includes features for connecting to MQTT brokers.
The eventemitter2 package is an enhanced version of Node.js's EventEmitter class. It provides advanced features like wildcard event names, which are similar to qlobber's topic matching. However, eventemitter2 is more general-purpose and is used for event handling within applications rather than for message brokering.
The postal package is a JavaScript library for pub/sub messaging. It offers similar topic-based subscription and publication features. Postal is more focused on in-app messaging and provides additional features like message channels and middleware, making it more versatile for complex applications compared to qlobber.
Node.js globbing for amqp-like topics.
Example:
var Qlobber = require('qlobber').Qlobber;
var matcher = new Qlobber();
matcher.add('foo.*', 'it matched!');
assert.deepEqual(matcher.match('foo.bar'), ['it matched!']);
The API is described here.
qlobber is implemented using a trie, as described in the RabbitMQ blog posts here and here.
npm install qlobber
A more advanced example using topics from the RabbitMQ topic tutorial:
var matcher = new Qlobber();
matcher.add('*.orange.*', 'Q1');
matcher.add('*.*.rabbit', 'Q2');
matcher.add('lazy.#', 'Q2');
assert.deepEqual(['quick.orange.rabbit',
'lazy.orange.elephant',
'quick.orange.fox',
'lazy.brown.fox',
'lazy.pink.rabbit',
'quick.brown.fox',
'orange',
'quick.orange.male.rabbit',
'lazy.orange.male.rabbit'].map(function (topic)
{
return matcher.match(topic).sort();
}),
[['Q1', 'Q2'],
['Q1', 'Q2'],
['Q1'],
['Q2'],
['Q2', 'Q2'],
[],
[],
[],
['Q2']]);
qlobber passes the RabbitMQ topic tests (I converted them from Erlang to Javascript).
To run the tests:
grunt test
grunt lint
grunt coverage
Instanbul results are available here.
Coveralls page is here.
grunt bench
qlobber is also benchmarked in ascoltatori.
Source: lib/qlobber.js
Creates a new qlobber.
Parameters:
{Object} [options]
Configures the qlobber. Use the following properties:
{String} separator
The character to use for separating words in topics. Defaults to '.'. MQTT uses '/' as the separator, for example.
{String} wildcard_one
The character to use for matching exactly one word in a topic. Defaults to '*'. MQTT uses '+', for example.
{String} wildcard_some
The character to use for matching zero or more words in a topic. Defaults to '#'. MQTT uses '#' too.
Go: TOC
Add a topic matcher to the qlobber.
Note you can match more than one value against a topic by calling add
multiple times with the same topic and different values.
Parameters:
{String} topic
The topic to match against.{Any} val
The value to return if the topic is matched. undefined
is not supported.Return:
{Qlobber}
The qlobber (for chaining).
Go: TOC | Qlobber.prototype
Remove a topic matcher from the qlobber.
Parameters:
{String} topic
The topic that's being matched against.{Any} [val]
The value that's being matched. If you don't specify val
then all matchers for topic
are removed.Return:
{Qlobber}
The qlobber (for chaining).
Go: TOC | Qlobber.prototype
Match a topic.
Parameters:
{String} topic
The topic to match against.Return:
{Array}
List of values that matched the topic. This may contain duplicates.
Go: TOC | Qlobber.prototype
Reset the qlobber.
Removes all topic matchers from the qlobber.
Return:
{Qlobber}
The qlobber (for chaining).
Go: TOC | Qlobber.prototype
Creates a new de-duplicating qlobber.
Inherits from Qlobber.
Parameters:
{Object} [options]
Same options as Qlobber.Go: TOC
Match a topic.
Parameters:
{String} topic
The topic to match against.Return:
{Set}
ES6 Set of values that matched the topic.
Go: TOC | QlobberDedup.prototype
—generated by apidox—
FAQs
Node.js globbing for amqp-like topics
The npm package qlobber receives a total of 0 weekly downloads. As such, qlobber popularity was classified as not popular.
We found that qlobber demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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