broken down into smaller modules that aren’t dependant on one another. You probably already use modules but we need them to be fully independent entities.
to speak to the rest of the application when something interesting happens. We then use a different layer to interpret requests so that modules don’t directly access the core. This aids in preventing applications from falling over due to errors with a specific module.
They probably can in most current architectures. Having an intermediate layer handle permissions for which modules can access which parts of your framework gives you a layer of security. This means a module is only able to do at most what we’ve permitted it do.
possible In our case, modules should not rely on other modules in order to function correctly. When used effectively, it’s straight-forward to see how changes to one part of a system may affect another.
from modular components When a module is reusable it’s clear how to use or extend it In JavaScript, there are several options for defining modules, including:
closures to bake privacy, state and organization into your objects. It’s quite similar to an IIFE with an object returned instead of a function. Commonly implemented as a singleton.
body of code, regardless of underlying complexity Hides the inner-workings of a library or set of modules, allowing the implementation to be less important. We thus only need to interact with the facade rather than the subsystem it encompasses.
other by acting as an intermediary Promotes loose coupling by preventing objects from referring to each other explicitly, solving our module inter-dependency issues.
vary independently, so it’s extremely flexible Somewhat similar to Observer/Pub-Sub, so it’s not difficult to understand how it fits in if you’ve used one of these patterns previously.
or listen for messages without worrying about the rest of the system Messages can be handled by any number of modules at once. Typically significantly more easy to add or remove features to systems which are loosely coupled like this.
always communicate indirectly. This can cause a very minor performance drop. Because of the nature of loose coupling, it’s difficult to establish how a system might react by only looking at the broadcasts. At the end of the day, tight coupling causes all kinds of headaches and this is one solution.
handles what planes can take off and land. All communications are done from the planes to the control tower, rather than from plane-to- plane A centralised controller is key to the success of this system as is the case with the mediator pattern.
sits in the middle between it and modules Ensures a consistent interface to our modules is available at all times Should be the only thing modules are aware of - they shouldn’t know about other components.
to be dependable The adapter acts as a security guard, determining which parts of the application a module can access Components only call their own methods and shouldn’t interact with anything they don’t have permission to
sandbox controller. Agrees that it could equally be considered the adapter, proxy or facade pattern. As Stoyan Stefanov defined an existing ‘sandbox’ pattern, I refer to the sandbox as a facade as IMO this pattern matches it’s purpose most closely.
whether this should be when the DOM is ready. The core should enable adding or removing modules without breaking anything. It should ideally also handle detecting and managing errors in the system.
that pattern. Self-contained modules Libraries • Your new architecture could potentially look something like this: Adapter (abstraction of the core) Mediation Publishers Subscribers
something interesting happens. eg. a new message has arrived.other modules related as necessary. Correctly publishing events of interest should be their primary concern.
LabelManager ‘Tom’s order has been successfully packaged ‘Tom’s order has been labelled notify(‘orderPackaged’,‘Tom’,‘success’) notify(‘orderLabelled’,‘Tom’, ‘success’) Module 3 DispatchManager ‘Tom’s order has been dispatched notify(‘orderDispatched’,‘Tom’, ‘success’,’12-08-11’) Start LabelManager Start DispatchManager
the mediator pattern. Responsible for module management. The facade abstracts the core to avoid modules touching it directly. Handles security. The modules contain specific pieces of functionality for your application.
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