Intro-To-Angular.js | A small angular application meant to show | Dependency Injection library
kandi X-RAY | Intro-To-Angular.js Summary
kandi X-RAY | Intro-To-Angular.js Summary
Angular.js is an open source MVC framework for web applications. Currently, Angular is at version 1.5.7 (the version used in this project). Angular is normally used for single page web applications, but can support multiple page applications if necessary. It can also be used in tandem with server-side languages to deliver content to the user in a way that is easy to digest. Angular is how web applications should be made. It takes base JavaScript and many of its well known libraries, namely JQuery, to the next level. By giving the developer simple tools to organize their client-side JavaScript, Angular makes it very easy to create modular, testable, and maintainable code that is not mixed with any other language. Angular is built around two very important principles, Modularity and Dependency Injection. The Modularity Prinicple of Angular maintains that each element of your application should be contained in a module. Modules are a way to keep each part of your application segmented from any other. Modules will usually contain the elements that are only necessary for that module, keeping dependencies in check. This enforces a feature based application structure, where each feature becomes its own module. This defines our module for the entire application (known as introApp). The module takes an array of strings as an argument. Each string corresponds to the name of another module that our application module wishes to use as a dependency. In other words, we are injecting those dependencies. Modules may have some functionality that other modules may want to use. For these instances, we can use Angular's built in Dependency Injection framework. Angular registers all modules within a project, and allows them to be used within other modules. Injecting a dependency will allow a module to use all public elements of said dependency. The module above gave us a good example of just how dependencies are injected using Angular. We simply pass any module names that we need as an argument into our new module. This allows for easy hot-swapping of dependencies, which can make code-reuse much simpler, and make testing our code much much easier. These concepts may seem confusing at first, but as we get into the actual elements that make up Angular, it should be made clear how everything fits together. Before we get into those elements though, let's talk setup.
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Community Discussions
Trending Discussions on Dependency Injection
QUESTION
I want to know, what is the best way to dispose the all IDisposable object after the request done.
AddTransient
- adds a type that is created again each time it's requested.AddScoped
- adds a type that is kept for the scope of the request.AddSingleton
- adds a type when it's first requested and keeps hold of it.
So, singleton could not be a good choice because it will disposes after app shot down. but scope and transient are good candidates. I have a repository which I want to create a connection with my db like this:
...ANSWER
Answered 2022-Mar-29 at 09:28After reading the comments I got that, I have to set the the interface as IDisposable
to dispose the connection, so I changed my code like this:
QUESTION
Im using the following go-logr/logr
library.
I have a test which needs to pass the logger as parameter
and check that it was able to log the data that was sent.
I need to test the function GetConfig
:
ANSWER
Answered 2022-Mar-10 at 14:44The logr.New
function accepts any implementation of the LogSink interface - This means you should just implement one that saves the calls onto a slice in-memory instead of printing, and then you can expect that the slice has your log output.
QUESTION
I’m trying to register ServiceBusClient
from the new Azure.Messaging.ServiceBus package for dependency injection as recommended in this article using ServiceBusClientBuilderExtensions
, but I can’t find any documentation or any help online on how exactly to go about this.
I'm trying to add as below
...ANSWER
Answered 2021-Sep-02 at 20:03ServiceBusClientBuilderExtensions.AddServiceBusClient
is an extension method of IAzureClientFactoryBuilder
:
QUESTION
Added hilt dependencies:
Build.gradle(project)
...ANSWER
Answered 2021-Sep-13 at 13:35So, it appears there is an issue integrating Hilt while targeting version 31 (Android 12).
When I had:
QUESTION
requirement is like this: user input is single character followed by an array of integers, such as 'A 1 2', 'B 3 4 5', 'C 1', etc. The single character means which class to construct and integers are input parameter to that constructor. Please note different classes might need different number of integers.
Then we need to write a program to parse user input and create objects accordingly.
My approach was to use regular expression for parsing and hard code which class to call.
But another senior developer said a better idea would be using dependency injection to automatically create objects based on user input. He gave another hint to create an interface and use spring framework dependency injection (not spring boot).
I am still confused how to create beans dynamically in this way. Can anybody help please?
...ANSWER
Answered 2022-Jan-22 at 11:44You can create a common interface for the classes that can be created, and a Factory bean that transforms the input.
QUESTION
As the title says I have a .NET Core application that I am trying to convert over to and take advantage of the built in Microsoft Dependency Injection.
I have an object and a base class for the object, call it CommunicationBase
and Communicator
. When my app starts up and reads the configuration file, I can have N number of objects to instantiate.
Previously, before switching to Dependency Injection, somewhere in my startup routine, where I read the configuration file, I would have a List
variable that I would instantiate and add Communicator
objects to and at the same time, set some of the base properties, which changed based on how many were in my configuration and each ones properties in config.
How would I achieve this with DI?
I understand that in my services, I would register the type so it can be injected into other class constructors.
For example, services.AddTransient();
but as I understand it, this just registers the types with DI. I can inject it into a class and have a random instance of one of them.
How would I then have N number of instances and be able to set properties of each one as I create the instance?
Or, is this a scenario where DI is not necessary or won't work and I need to just do it the way I was doing it before?
Thanks!
...ANSWER
Answered 2021-Dec-28 at 11:26Firstly do you need to has clear the differences between Transient, Scoped, Singleton lifetime. To understand how works with the list of Communicator objects that will be read from your configuration file.
One approuch to resolve your question is
- Create an interface ICommunicatorList with one method to get a List, i mean you can envolve the list of communicators.
- Create a clase that inherits from ICommunicatorList (for example called CommunicatorList), with a private field for your list of Communicators. On the constructor method set your private field with the list of communicator, o here you can receive like a parameter from the section of the config file to iterate and full your private field.
- on this class implement your code to return the list of communicators.
- Now, in your startups file you can now create the service services.AddTransient< ICommunicatorList>(x => new CommunicatorList(parameters));
QUESTION
I have a Spring Framework
5.3.10
application — not Spring Boot
. I'm running into a rather trivial problem creating/injecting a Properties
bean. Here is my setup:
ANSWER
Answered 2021-Dec-19 at 22:27The used (spring standard) "factory" implements FactoryBean
as InitializingBean
...
QUESTION
I'm looking into .NET 6, and wanted to build a simple console application, with some dependency injection.
From what i can read, a lot has been done to make the startup (now just program) file, more readable. What does confuse me a bit is, that all improvements seems to have been made to WebApplication.CreateBuilderpart used in API projects, and not the Host.CreateDefaultBuilder. As mentioned in this blog
Microsofts own docs, also only seems to mention WebApplication.
To me it seems like WebApplication is only for web projects, like an API, and i can't find anything that confirms og debunks that.
Is it okay to use WebApplication in a console application, or should i rely on Host, and keep the stacked lambda expressions ?
...ANSWER
Answered 2021-Dec-14 at 08:36WebApplication.CreateBuilderpart()
is only used for web/api applications like the name implies Host.CreateDefaultBuilder()
is used to build a generic host (without web services, middleware etc) which you can use to build anything other than webhost.
See for example; https://docs.microsoft.com/en-us/dotnet/core/extensions/generic-host Which has not changed.
Its true that it feels a bit awkward to build console apps and/or backgroundservices at the moment.
QUESTION
I inherited a fairly large codebase that makes heavy use of Autofac. I discover something interesting or even slightly puzzling.
I have a class as such
...ANSWER
Answered 2021-Oct-27 at 05:03This behavior is documented in Implicit Relationship Types
For example, when Autofac is injecting a constructor parameter of type
IEnumerable
it will not look for a component that suppliesIEnumerable
. Instead, the container will find all implementations ofITask
and inject all of them.
QUESTION
I am studying design patterns, and at one moment caught myself with an idea, that most creational patterns like Factory and Abstract Factory are not so useful in the scope of a dependency injection environment where we usually don't create objects with the new
keyword but "inject" them from some context. I also understand that most probably I am wrong and I need a good explanation to make things clear.
ANSWER
Answered 2021-Sep-01 at 02:57DI frameworks like Spring initialize and manage beans. Creational pattern can be used to create domain (bussines) objects.
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Install Intro-To-Angular.js
package.json - Sets up dependencies for Node, to be installed using the npm install command.
bower.json - Similarly to package.json, sets up dependencies for bower to be installed using the bower install command.
karma.conf.js - Sets up the test running framework Karma.
protractor.conf.js - Sets up End to End testing framework Protractor.
Install Powershell from the Powershell website.
Install Node.js from it's website, then restart your computer.
Run node -v and npm -v to verify installation.
Install bower with npm install -g bower, run bower -v to verify installation.
If desired, install Gulp with npm install --global gulp then add to project npm install --save-dev gulp.
Add package.json and bower.json files to the project from This Gist.
Optionally add karma.conf.js and protractor.conf.js files to project from the Gist mentioned above.
Run npm install to install all components.
Start your server using npm start.
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