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Durable Rules provides real-time, consistent and scalable coordination of events. A forward chaining algorithm (A.K.A. Rete) is used to evaluate massive streams of data. With a simple, yet powerful meta-liguistic abstraction you can define simple and complex rulesets. An example to illustrate the point:

var d = require('durable');
d.run({
    approve: {
        r1: {
            when: { $lt: { amount: 1000 } },
            run: function(s) { s.status = 'pending' }
        },
        r2: {
            whenAll: {
                $m: { subject: 'approved' },
                $s: { status: 'pending' } 
            },
            run: function(s) { console.log('approved'); }
        }
    }
}); 

Durable Rules relies on state of the art technologies:

• Node.js is used as the host. This allows leveraging the vast amount of available libraries.
• Inference state is cached using Redis, which lets scaling out without giving up performance.
• A web client based on D3.js provides powerful data visualization and test tools.

Resources

To learn more:

• [Setup] (http://www.github.com/jruizgit/rules/wiki/setup)
• [Approve Tutorial] (http://www.github.com/jruizgit/rules/wiki/approve-tutorial)
• [Order Tutorial] (http://www.github.com/jruizgit/rules/wiki/order-tutorial)
• [Concepts] (http://www.github.com/jruizgit/rules/wiki/concepts)