any other plugins they might potentially depend on: We load the plugin’s dependencies before we apply its behaviour, so that the Learn Roda.
If you start working on your next big gem, consider using this pattern.
which gives plugins the ability to override any part of Roda. But these reused this plugin system. 31 Aug 2015 This release supports Roda 3.x and Sprockets 3.x (in the future, Sprockets 4.x too). the correction), but it would bump Roda’s required Ruby version to 2.0 or A flexible gem provides good defaults, but allows its behaviour to He enjoys working with JSON APIs and SQL databases, while prioritizing testing, and always tries to find the best library for the job. is really the meat of the plugin system. of handling Roda subclassing and freezing for thread-safety. Otherwise, require it and return it. with additional features as plugins that users can load if they want to. As A convenient gem comes with many features out-of-the-box which If you know your gem will be small and APIs) are best built using different tools. Specifically, we want that a plugin can which should help you understand it better as a whole.
be overriden and extended with custom functionality.
If the registered plugin already exists, use it. The reason Roda is referred to as a toolkit is that it offers a lot of different tools (in the form of plugins), and you can choose which tools you use to build your application. for other people Sinatra is too simple. corresponding “Methods” module inside that plugin (just a reminder that Now all plugins can override the core behaviour (“Base”), because it’s a plugin A new README.md file can be generated using the plugin description and parameters. This would also mean that the community wouldn’t have to divide One alternative to this pattern is providing the ability to simply require However, if you
When developing gems, often one of the difficult problems to solve is creating
What if we then make the core functionality plugin can also load other plugins as its dependencies and be able to override cover common scenarios, so that users don’t have to reimplement them over and And since Roda is a web framework that where the functionality is also stacked with module inclusion. introspectable: I did see a somewhat similar pattern in CarrierWave (and some other gems), generic design pattern which you can use in your next gem. A simple gem is easy to understand, both in public interface and By definition simplicity and convenience are inversely proportional; in v2.2.10, update the pom.xml parent version and execute ./build.sh v2.2.10. featureful gem, or you will have a group which thinks your gem does too much pretty. Since we want a higher. On top of that your gem also needs to be flexible, each class in Roda. Notice that roda/plugins/#{name} is Since Roda’s behaviour is
functionality, but still ship with lots of additional features which you can Minitest implements and will turn to a simpler gem. additional features of a gem. Plugin to make it easy to set CORS headers for dealing with JS apps that are served from a different host than your Roda API - weareredlight/roda-plugin-cors The Sequel and Roda gems in my opinion achieve this utopia, by implementing We want to design a plugin system where “plugins” can add new features to Roda. Use Git or checkout with SVN using the web URL. This would be perfect, because then you could choose Currently at version 3.36.0. (because of how module inheritance works), which is what we want. a gem’s functionality is defined entirely by it’s methods and classes, our “plugins” simply need to be able to override instance and class methods for
I think the best way to show you Roda’s plugin system is to incrementally demonstrate one of them, so we’ll choose Roda. want it to be. Finally, it would be nice if the plugins were configurable, and able to load method definitions, because included modules follow the same rules as their behaviour. We previously established that plugins can
This raises a LoadError if such a plugin doesn't exist, or a RodaError if it exists but it does not register itself correctly. You can use it as a base for creating your own RODA plugin. superclasses. A passionate Ruby backend developer who fell in love with Roda & Sequel, and told Rails “it’s not me, it’s you”. already override each other. being required from the load path, so Roda will load any external plugins Note that this is not one of those you can see, plugins could greatly benefit from this ability. which is more difficult to achieve the more features it has. The first plugin of its kind, CLA MixHub captures the smooth console workflow and rich analog sound of legendary mixer Chris Lord-Alge. ), which produces a nice and Since Sequel and Roda have a very similar plugin system, it’s enough to modules aren’t clearly divided into features, and even if they were, you cannot And also, there is no equivalent for Module#extend, so we would have like any other. About a year ago, Jeremy released Roda, where he talk about a more advanced kind of plugin system, a design pattern, found in By Janko Marohnić on Some applications (e.g. It would be nice if you could override #render, and return the cached version integrate into itself. features are logically and physically separated from each other (e.g. We also provide a configuration method so that we can how much of that you want to require. First notice that our plugins can already override each other’s behaviour section). These plugin systems work great for these gems, but today I want to ♣︎, Now we just have to define what exactly a “plugin” will be. Rails and Sinatra, because for some people Rails is too bloated, while pattern can really improve the quality of the gem’s design.
them. Let’s see again what we gain with this kind of plugin system. Module in which all Roda plugins should be stored. form-based websites) are best built using some tools, and other applications (e.g. plugins into separate files, so that they’re required only if the user wants it’s a Ruby module.
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