Insofar as the security features are concerned, AWS SDK for Java can provide powerful encryption to keep the code well protected. NET Core 2.1.Application developers, especially those involved in putting together apps that are supposed to integrate with various web services, will surely need the most appropriate tools for the job.įor Java programmers who have to create Amazon Web Services compatible software, there is a certain toolkit that can be used and it goes by the name of AWS SDK for Java.įully equipped for seamless integration with AWS services and aiming to make the process of coding the apps less tedious, this package is well suited for building programs for Amazon S3, Amazon DynamoDB or Amazon EC2 platforms, through the use of the Application Programming Interfaces (API) it bundles.Īll the necessary components, libraries and dependencies are part of this toolset and there are also numerous samples to facilitate the development process, as well as adjoining documentation for explaining everything in detail, with examples. In part 2 of this blog post, we will look into hosting: WebHost, and in particular the new GenericHost support added into. It also discourages bad practices, like not providing interfaces where appropriate and overusing static helper classes.NET Standard makes using DI easy, and the library simplifies integrating AWS clients into your application. Conclusionĭependency injection lowers the complexity of wiring together nontrivial applications. An added benefit to using constructor injection is it makes unit testing with mocks really easy. You’re not constructing these objects by hand, so adding additional parameters or other refactoring should not be painful. NET DI only allows constructor injection. We never had to create these clients, or even the application. The interesting thing is the constructor: the DI container will inject the clients for us. Our Application simply lists all of the Amazon S3 buckets and Amazon DynamoDB tables in our account. (await _amazonDynamoDb.ListTablesAsync()).TableNames (await _amazonS3.ListBucketsAsync()).Buckets.Select(bucket => bucket.BucketName) Var tableNames = string.Join(Environment.NewLine, await GetTableNames()) Var bucketNames = string.Join(Environment.NewLine, await GetBucketNames())
(_amazonS3, _amazonDynamoDb) = (amazonS3, amazonDynamoDb) Public Application(IAmazonS3 amazonS3, IAmazonDynamoDB amazonDynamoDb) => Private readonly IAmazonDynamoDB _amazonDynamoDb The AWS configuration is extracted by the library and injected into our AWS clients when they are constructed, which are created and passed to the Application when it’s constructed.Ĭlass Application : IHostedService, IDisposable We read them using the Microsoft configuration libraries, and add the Configuration to our DI container. In this case, we store these settings as JSON. These options could be stored as environment variables, XML, JSON, and so on.
The library extracts the AWS options out of the configuration object. When we construct the ServiceProvider, it will create our Application and pass in the needed dependencies. In this case, “Application” is our main class, and it requires an S3Client and a DynamoDB client to run. Here, we are setting up a ServiceCollection with all of the components needed in our app. Var serviceProvider = services.BuildServiceProvider() Īwait serviceProvider.GetService().Run() Var configuration = new ConfigurationBuilder() and the last source in the pipeline wins in case of conflicts. We can add other sources, such as environment variables. Private static async Task NormalDependencyInjection() Let’s take a look at a simple demo application. You will need the following NuGet packages: NET Standard 2.0 compliant, so it will work with any application running on. NET Standard 2.0-compatible runtime. The current version is. The following demo code assumes you’re using a. It adds extension methods to IConfiguration to extract AWS specific options, and to IServiceCollection to add AWS clients by specifying the client interface. NET Core web applications, but it can be used everywhere – GUIs, services, libraries, even simple console applications!ĪWS provides the library to simplify using dependency injection with AWS clients. This was used primarily in the context of developing. NET Standard 1.1), lightweight DI can be provided by. Dependency injection (DI) is a central part of any nontrivial application today.NET has libraries like Ninject for implementing inversion of control (IOC) in their development and, as of.