angular state management
... Akita is a state management pattern, built on top of RxJS and based on object-oriented design principles.
It is built on top of RxJS and inspired by models like Flux and Redux. No need for RxJS at all!The key takeaway: Default Angular change detection enables real simple state management!I wonder why this is not documented more prominently …Sometimes a simple solution is good enough. What is application state? Even after this refactoring, we still manually manage the client-server synchronization, and, as a result, we can make mistakes. A simple concrete example of application state would be a list of customers maintained in an application. It is easy to use Redux and still mix computation and state management, not handle errors and optimistic updates, or use mutable state. Check out the following posts for more information:We shall start with defining all the actions our application can perform:Previously, we had an ad-hoc strategy for handling optimistic updates. State Management in Angular using Akita.
Why was it so hard? And when dealing with concurrent distributed systems, ad-hoc solutions quickly break down.We embarked on refactoring the application. Rather this was the means of achieving some of our goals. Or using the distributed systems terminology: should we use strict or eventual consistency?These, among others, are the questions we are going to explore in this article.Let’s start with an example of what seems to be a reasonably built system. There is an abundance of 3rd party state management libraries: I have seen a great share of over-engineered Angular applications, where zealous engineers implemented state management that looks like a fully automated Tesla Gigafactory … for simple “forms over data” applications.As a consequence I regularly see teams struggle to extend and maintain these applications once the zealous engineers switched to the next project.Yet there is also a desire for simpler state management:The pattern of the observable data service looks similar like this:Yet there is an even simpler and more intuitive way to do state management in Angular…Here we just leverage the default change detection of Angular with a stateful service:I think this is the simplest and most intuitive way to implement state management.
State-management in Angular can be a complicated topic. What about the local UI state? I implemented my own store and connected it to the router (all together it is fewer than a hundred lines of code).I did it to show that careful thinking is what is really important, and not using the latest version of any library.Having said that, I think @ngrx/store is a great Redux implementation for Angular, and you should use it unless you have a reason not to. Everything was ad-hoc. I recently created a Free RxJS Course (ReactiveX) that you should definitely check out before attempting to learn Ngrx.. Ngrx store helps you build more robust applications by better organizing your app's state -- or in other words, your app's data.. Another way is to make navigation part of updating the store. But if we look deeper, we will find a lot of problems.Second, the rate method optimistically updates the passed-in talk object to get a better user experience. If the reducer throws an exception, the router will cancel the navigation.In other words, we solved all the problems listed above.You can find the source code of the application after this refactoring I deliberately haven’t used any existing Redux libraries for building this application. We need to coordinate multiple backends, web workers, and UI components, all of which update the state concurrently. And finally we can make updating the store part of navigation. They can also work in combination with Redux, as shown here (If you can justify the investment, I’d highly recommend you to check out Apollo.You can find the source code of the application after this refactoring One way to fix it is to build a generic library synchronizing the store with the router. Be intentional about your design.Nrwl's latest news from the team. You should carefully consider if you really need If you are going for a more complicated architecture, make sure that you get real benefits out of it. These libraries are opinionated and have heavy implications on the architecture of an application. Same for NPM statistics. Akita is a simple and an effective state management solution for Angular applications. Do not trust anyone saying they have “one simple pattern/library” fixing it — that’s never the case.Decide on the types of state, how to manage them, and how to make sure the state is consistent. We can do better than that.This is a significant change. How do we synchronize the persistent state, the URL, and the state on the server? State management and computation/services are separated. We'll share what we're working on and share tips and techniques for software development. We fixed some of them, but many still remained, and the solution was not holistic.The application had these issues because we did not think through its state management strategy. Because the local UI state is almost never your problem. In other words, the router should invoke the reducer, not the other way around.In this arrangement, the router parses the URL and creates a router state snapshot. Additionally, for angular-redux, you can use the wisdom of the Redux community. This is an application that shows a list of talks that the user can filter, watch, and rate.The application has two main routes: one that displays a list of talks, and the other one showing detailed information about each talk.This is a rough sketch of this application’s architecture.Both the components do not do any actual work themselves, and instead delegate to At a first sight, the implementation looks reasonable: the application logic is handled in the services, the methods are small, and the code looks well-written.
State-management in Angular can be a complicated topic. Simple state management in Angular with only Services and RxJS # angular # rxjs # typescript # ngrx. We no longer use mutable objects for persistent and client state. Now they only query the state and dispatch actions.To make it clear our goal was not to use Redux. Redux enables us to fix all of these, but it is not a panacea and not the only way to do it.Rule 4: Redux should the means of achieving a goal, not the goalAlso note that we didn’t touch any local UI state during this refactoring.
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