This is a toy application that lets you read past articles from the Planet Clojure RSS feed (downloaded December 2019), written on top of the Fulcro RAD demo application.
It is intended to show how one would build a simple application with Fulcro.
The ClojureScript client has two screens:
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Main: show all 7120 RSS stories, with keybaord navigation to show full version of current story
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Search: search articles: one input form to trigger search on server
It demonstrates using Pathom to retrieve stories and search results.
The Clojure server reads from resources/stories.txt (an EDN file) and uses it as its "database."
This project includes files to build using Google Cloud Build, and to deploy into Google Cloud Run.
You can run the application in two places:
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Google Cloud Run as GraalVM native image: very fast startup time, about 8 seconds (requires 2GB RAM). (More commentary on native image below.)
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Google Cloud Run as uberjar: it may take 20s for the application to start, because of cold starts — GCR handles cold starts faster than Heroku by allowing you to add memory and cores.)
Screenshot below:
This is a demo repository for Fulcro RAD. It includes a shared source directory of files that would be common to any project, and then separate source directories that have specific files that would be needed to work with specific back-end technologies (currently SQL and Datomic).
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Important
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Login is tony@example.com with password letmein.
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RAD is a set of libraries for Fulcro that have you model your data via attributes. An attribute is a description of a fact in your data model, that itself can have descritive data (ala RDF). Fulcro components can also be given data attributes. The combination of annotating components and the data model leads to some great synergies, since Fulcro itself already has the UI components participate in your application’s global data model.
The result is a system where a group of attributes can be leveraged to automatically create:
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Database schema
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Networking APIs
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Documentation
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UIs that pull exactly what they need
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Applications that auto-normalize their client-side data
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Form and Report generation
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Federated data modes, where a cluster of attributes can actually live in disparate locations under different control.
and much more.
RAD includes a number of features that I would recommend in any new production project using Fulcro. This demo is a good reference for how to set up such a project; however, RAD is changing rapidly, so beware that this demo may be somewhat out of date. This is not a template project per-se, but the RAD approach of designing your data model via attributes that can then be leveraged to generate a lot of your boilerplate code is quite useful and powerful in all stages of development.
The demo should be relatively easy for even a beginner to understand and tinker with, and I hope it serves to inspire you to learn more about Fulcro in general; however, if you do not understand Fulcro, then you will very quickly run into difficulties.
Beginners should therefore start with non-RAD projects using the core library via examples from the Developer’s Guide or even the standard https://github.com/fulcrologic/fulcro-template. RAD does not eliminate the need to understand the core library. RAD is simply some macros and patterns that leverage Fulcro.
The SQL version has some known bugs. If you want to play with RAD, use the Datomic database adapter for now.
- Does RAD Require a Database (or Server)?
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No the general front-end elements of RAD could be powered by any data source. The main requirement is that a Fulcro "remote" exist which is able to support an EQL interface. It is trivial to build a remote that uses anything from an SQL database on a server to Browser LocalStorage.
You must compile the CLJS source to run the client. If you want to be able to edit it, just start a shadow-cljs watch:
$ yarn
$ shadow-cljs watch mainif you don’t have yarn, use npm install instead.
The example code for Datomic components is in the src/datomic folder, along with a custom
development.clj. It defaults to using an in-memory datomic-free database.
You can run it with the :datomic deps alias:
$ clj -A:dev:datomic
user=> (clojure.core/require 'development)
user=> (development/go)Please see the datomic-cloud branch of this repository. An alternate setup is required.
The example code should work with most SQL databases (and defaults to using an in-memory H2 db). The data source
is configured in the defaults.edn config file in the sql source
directory. See the HikariCP connection pool documentation.
The SQL example has a custom development namespace in the src/sql source
folder, along with components needed to run that server.
You can start the server-side version for SQL using the deps aliases that set up the proper classpath:
$ clj -A:dev:sql
user=> (clojure.core/require 'development)
user=> (development/go)The example code for Crux components is in the src/crux folder, along with a custom
development.clj. Crux nodes are configured by a map under :roterski.fulcro.rad.database-adapters.crux/databases key
in defaults.edn.
You can run it with the :crux deps alias:
$ clj -A:dev:crux
user=> (clojure.core/require 'development)
user=> (development/go)RAD uses several different libraries at once. It is ideal that you check out the source of all of those and set
up your deps so you can run from the source of them all at once. You may also want to update the set-refresh-dirs
in the development namespace to point at those additional source directories in CLJ so you get proper reload there.
The very active development I’m doing makes changes to 5 projects at once (Fulcro, Fulcro RAD, Fulcro RAD Datomic,
Fulcro RAD SQL, and this demo). I do not guarantee I will keep everything in sync as far as versions in the deps
file go. I personally set the following in my top-level ~/.clojure/deps.edn:
{:aliases {:f3-dev {:override-deps {com.fulcrologic/fulcro {:local/root "/Users/tonykay/fulcrologic/fulcro"
:exclusions [com.taoensso/sente]}}}
:rad-dev {:override-deps {com.fulcrologic/fulcro-rad {:local/root "/Users/username/fulcrologic/fulcro-rad"}
com.fulcrologic/fulcro-rad-sql {:local/root "/Users/username/fulcrologic/fulcro-rad-sql"}
com.fulcrologic/fulcro-rad-semantic-ui {:local/root "/Users/username/fulcrologic/fulcro-rad-semantic-ui"}
com.fulcrologic/fulcro-rad-datomic {:local/root "/Users/username/fulcrologic/fulcro-rad-datomic"
:exclusions [com.datomic/datomic-free]}}}}}so that in IntelliJ (or at the command line) I can work from local sources for all of them. I try to remember to push SNAPSHOTS daily, but if I forget and you see some missing symbol error or things are broken, that is almost certainly why.
Running shadow and clj would look like this from the command line:
# in one terminal
$ shadow-cljs -A:f3-dev:rad-dev watch main
# in another terminal
$ clj -A:dev:f3-dev:rad-dev:datomicIn IntelliJ, you’d simply make sure to run a CLJ REPL with current classpath, and use the alias checkboxes and + button
in the Clojure Deps tab to set it up.
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