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Multilang implementation in node.js for the Storm distributed realtime computation system
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README.md

storm-node-multilang

An implementation of the multi-language support for Storm in node.js

Example Usage

Spout creation

    var Spout = require('storm-node-multilang').Spout;

    //The Spout constructor takes a definition function,
    //an input stream and an output stream
    var sentenceEmitter = new Spout(function(events) {
        var collector = null;
        var seqId = 1;

        //You can listen to the spout "open", "ack" and "fail" events to
        events.on('open', function(c) {
            collector = c;
        });

        events.on('ack', function(messageId) {
            console.log(messageId + ' acked');
        });

        events.on('fail', function(messageId) {
            console.log(messageId + ' failed');
        });

        //The definition function must return a function used as
        //the nextTuple function.
        return function(cb) {

            collector.emit(["hello"], seqId++);
            cb();

        }

    }, process.stdin, process.stdout);


    process.stdin.setEncoding('utf8');
    process.stdin.resume();

Bolt creation

    var Bolt = require('storm-node-multilang').Bolt;

    //The Bolt constructor takes a definition function,
    //an input stream and an output stream
    var joinBolt = new Bolt(function(events) {
        var collector = null;

        //You can listen to the bolt "prepare" event to
        //fetch a reference to the OutputCollector instance
        events.on('prepare', function(c) {
            collector = c;
        });

        //The definition function must return a function used as
        //the execute function.
        return function(tuple, cb) {

            collector.emit(tuple.values.join(', '));
            collector.ack(tuple);
            cb();
        }

    }, process.stdin, process.stdout);

    process.stdin.setEncoding('utf8');
    process.stdin.resume();

How to test my node.js spouts and bolts with Storm ?

To test your node.js spouts and bolts you will need to setup a storm cluster which is very painful if you don't want to run VM and a Zookeeper cluster.

Storm provides a LocalCluster class to test a topology locally.

Maybe the easiest way to test your topologies is to use our storm-local-multilang project.

Installation

$ npm install storm-node-multilang

Running Tests

To run the test suite first invoke the following command within the repo, installing the development dependencies:

$ npm install

then run the tests (require mocha) :

$ npm test

Licence

Copyright (c) 2012 Michaël Schwartz, EPOKMEDIA info@epokmedia.fr

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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