A CQRS and Event Sourced architecture for node.js
npm install adroit
This library suggests an architecture based on CQRS technique of writing software with a focus on Domain Driven Design (DDD). If you are unfamiliar with these concepts, you should read about them before trying to use this library.
var adroit = require'adroit';
Note that if you do not initialize, adroit will assume you have riak and/or redis running with default settings on localhost.
adroitadroitriakConfig:host: 'host.of.riak.instance'port: 8098 // or whatever port you useredisConfig:host: 'host.of.redis.instance'port: 6379 // or whatever port you useoptions:;
var data =commandName: 'doThingsAndStuff'otherFields: goHere;adroitqueueCommanddata
adroit.loadAggregate reconstitutes an aggregate via a promise. This aggregate will also have the stream object that was used to reconstitute it.
adroitloadAggregateaggregateId loadFunctionthenvar stream = aggregatestream;// Handle error here;
Generally loadFunction will be defined in your aggregate object. The purpose of this function is to apply an event to your aggregate. The event stream that represents the state of your aggregate will be applied individually and the function will return your reconstituted aggregate.
Once you've processed the commands and have generated one or more events that you'd like to save and publish to the message bus, you should commit your changes like this. You will need a reference to the stream object returned when you loaded the aggregate. This call returns a promise that resolves true or rejects with any error condition.
adroitcommitEventstream eventDatathen// any post processing// handle error;
These functions are intended to interact with the read model.
adroitloadUIviewName viewKeythen;adroitcreateUIviewName viewKey datathen;adroitupdateUI // same signature as createUI
Subscribing to messages on the message bus (commands, events). Channel can be "commands", "events", particular command or event names, or whatever you want. Parameter errorCallback is optional.
adroitsubscribechannel callback errorCallback;
As a convenience, Adroit will generate UUIDs for you if you decide ot use UUIDs for your application.
var id = adroitnewId;
Copyright (c) 2014 Christopher Gillis
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.
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