Design patterns by tutorials ray wenderlich pdf free download

Move the Bookmark and Document models provided in the starter project to the core module. Select Bookmark and Document files from app module and drag them to the com.

This layer provides abstract definitions for accessing data sources like a database or the internet. The main purpose of the repository pattern is to abstract away the concrete implementation of data access.

Using the repository pattern is a good example of the Dependency Inversion Principle because:. Select com. This data source will take care of storing and retrieving the currently opened PDF document.

Next, add a new Kotlin file named BookmarkRepository to the same package and copy and paste the following code:. Note that you mark all the methods with the suspend modifier. This allows you to use coroutine-powered mechanisms in Room, for simpler threading. This layer converts and passes user actions, also known as use cases, to inner layers of the application. Create a new Kotlin file named AddBookmark in com. Add the following code after the package statement:.

Each use case class has only one function that invokes the use case. This enables you to simplify the function call on AddBookmark instance to addBookmark instead of addBookmark. This concludes the implementation of the three inner layers in the core module. The Framework layer holds implementations of interfaces defined in the Data layer.

Your next task is to provide implementations of Data source interfaces from the Data layer. Start with OpenDocumentDataSource. It will store the currently open document in memory and is the simplest one. Create a new file in app module in com. Paste the following after the first line:.

Currently, the open document is stored in memory, so the implementation is pretty straightforward. You will use the remaining data sources to delegate and persist data in the database, using the Room library.

The classes required for persisting Bookmarks and Document via Room are in the db subpackage. Add the following code in the new file:. This layer contains the User Interface-related code. This layer is in the same circle as the framework layer, so you can depend on its classes. Before moving on to implementing the presentation layer, you need a way to provide the Data sources to the data layer.

You should usually do this using dependency injection. It is the process of separating provider functions or factories for dependencies, and their usage. First, replace the empty Interactors class in the framework namespace with the data class that holds all interactors:. Open MajesticReaderApplication and replace onCreate with the following, making sure you add all the necessary imports:.

This injects all the dependencies into MajesticViewModelFactory. It creates ViewModels in the app and passes interactor dependencies to them.

Open LibraryViewModel. The ViewModel contains functions for loading the list of documents and adding a new one to the list. It serves as a connection between the UI and the interactors, or use cases. This fetches the list of documents from the library using the GetDocuments interactor, from within a coroutine, which you start by calling launch.

Once done, you post the result to the documents LiveData. Next, for addDocument , you want to additionally call loadDocuments after adding a new Document:. To add a new document, you first launch a coroutine, as before, then use withContext , to move the database insert to an IO-optimized thread, and suspending until insertion completes. In the end, you load the documents again, to update the list.

Now build and run the app. You can now add new documents to the library. At last, you can bear the fruits of your labor! Tap the floating action button.

Open ReaderViewModel in com. Add the following code in its place:. This will change the value of bookmarks each time you change the document. It will fill with up to date bookmarks, which you get from the interactors, within a coroutine. Your bookmarks field should now look like the following:. The document holds the document parsed from Fragment arguments. ReaderFragment will subscribe to it to get the list of available bookmarks. Page that you currently display, if any. They use LiveData transformations.

This data then dictates how the UI should appear and behave, in the ReaderFragment. Find isInLibrary. It should return true if the open document is already in the library.

Replace it with:. This will use GetDocuments to get a list of all documents in the library and check if it contains one that matches the currently open document. Since this is a suspend function, change the isInLibrary LiveData code to the following:. In the end, the LiveData relations are really simple. Every time document , currentPage or bookmarks change, isBookmarked will receive an update and change, as well. Put the following code in its place:.

This creates a new Document that represents the document that was just open and passes it to SetOpenDocument. This blog began in as a personal online journal; in the past few years it became mostly an outlet for technical, programming-related posts.

It's my way to document things I find interesting for my future self. Also in Dotnet Blogs eli. San Francisco, California, US Telling you why bugs happen and servers crash, so you can go home on the weekend. Blogging about Java and Scala. Takipi is now OverOps.

Lebanon Tutorials and Posts about Programming. With the daily continuous advancement of technology, the need for new websites, apps, or software is growing every day. In order to take your idea or business to the next step, you need the help of a professional developer who can bring your project to life. I am a freelance developer who has worked with clients on different projects in a variety of fields such as finances and event planning.

Pakistan My name is Waqas Anwar and I am a developer, blogger, teacher, speaker, quick learner, and the founder of the EzzyLearning. Austin, TX Husband. Pug dad. Born again Linux user. Hyderabad, Telangana, India Learn online computer courses for free with realtime examples. Learn Programming python, c, java etc. Kabul, Kabul, Afghanistan Covers articles about designing, developing and maintaining web.

Suhail Kakar is a Developer from Afghanistan who loves to code and share valuable tips for new programmers. Hi, I'm Ashwin Joy. I'm a Computer Science and Engineering graduate who is passionate about programming and technology. Pythonista Planet is the place where I nerd out about computer programming.

On this blog, I share all the things I learn about programming as I go. PHPForever is an Opensource web development tutorial. Its aim is to provide free tutorials as well as a project on Opensource technology. India This is a blog on robotics, artificial intelligence, automation, and advanced technologies. England, UK Hi. I'm Mike. I'm on a journey to learn code and I'm the creator of CodeWithMike. It's basically a code and tech blog with a learning journal attached.

I created this blog to document what I'm learning, how I'm learning it and to post articles that I think will help others that are in a similar situation. India Codeamy. Brisbane, Queensland, Australia I am Rahul. I am a programmer, blogger, youtuber and enjoy running.

Blogs are usually technical and about life in general. Programming languages news, articles and discussion lambda-the-ultimate. Web development sevices in Delhi.

Germany Objc. It provides a user-friendly and beautifully designed page with more than 20 issues on such topics as debugging, security, games, MVVM and more. Subscribe to geekstrick to get the latest news.

Become a Full-Stack Developer. Guaranteed Dev Internship. Stay up to date with all of our coding tips and tricks, plus special LEARN academy coding workshops and coding meetups by following our blog.

Code4IT is a blog provided by Davide Bellone. The main topics are. California, US Welcome to Codelivly. We provide latest information related to programming. We are a bunch of people who are working in various IT technology areas. We have extensive experience in various IT technology area and we want to help other IT by providing good tips and tricks so that they can excel in there respective fields.

We believe in sharing the knowledge and helping in each other. Wanica, Suriname This website share new programming related books and pdfs. This pdf will help you to learn language with easy way. Mission is to help programmers. Bulgaria The idea is to show a little more knowledge about programming and when possible to link it to supply chain functions and problems such as forecasting and TCO analysis. Your awesome place to get knowledge about programming and technology.

Oregon, US This is a programming blog from a veteran developer. Tutorials, tips, tricks, and opinions about programming, operating systems, data, and more. Coding N Concepts is a technical blog for developers by developers to help you with coding problems, puzzle-solving, interview preparation, learning concepts in a simplified way.

So I am now a full time math programming consultant I will try to post my technical notes here. Keeping a searchable list of them will make this useful for me in my daily life. Hi there, I'm Khai Seng! Basically, I write just about anything I have an interest in. The other purposes are self-documentation, technology change very drastically it is impossible to remember every, solution, problem you encounter. Rajkot, Gujarat, India Codingvila provides articles on asp.

Also in Indian Web Development Blogs codingvila. The TechBlogStation believes to be strong platform to learn, understand and apply these state-of-the-art technologies and programming concepts. Programming is a mix of engineering and art, so listening music, photography are some of my hobbies which try to keep the art in me alive.

This is what I do after the kids go to bed and before Forensic Files. I casually write code. Niraeth - Programming, Security and Tech. Self-taught programmer and reverse engineer for over 5 years. Every show will cover a new programming language, so listeners will be able to speak intelligently about any programming language. London, England, UK On the Education Ecosystem blog, we'll share stories about programming languages, skills and updates from coding industry, picked by our staff and broadcasters.

Germany FusionReactor is an Application Performance Monitor for Java and ColdFusion, which goes beyond 'just monitoring' to actively minimize downtime and accelerate time to fix. Our mission is to provide products which make the lives of software developers and IT easier, by improving the quality, performance and service of software applications fusion-reactor.

Powered by QtPi robotics. Estonia Learn about the latest technologies, functional programming, and mathematics on our blog. Serokell provides full-stack functional programming Haskell, Elixir, Rust, Agda consulting and development services. Also in Functional Programming Blogs serokell. Random ramblings on technical topics. I'm currently a software engineer at Email us to Request Spreadsheet with email contacts at anuj feedspot. Learn more. Back to top Top Category No. Back to top Top Country No.

Tags: programming forums , programming instagrammers , programming rss feeds, Share:. Feedspot has a team of over 50 experts whose goal is to discover and rank blogs, podcasts and youtube channels in several niche categories. Publishers submit their blogs or podcasts on Feedspot using the form at the top of this page. Our expert editorial team reviews and adds them to a relevant category list. Ranking is based on relevancy, blog post frequency freshness , social metrics, domain authority, traffic and many other parameters.

We routinely remove inactive blogs and those which are no longer relevant to a given list. List is updated as we receive new blog submissions and re-ranked every few weeks.

Doing blogger outreach or influencer marketing and want to connect with new influencers in niche markets? Improve your outreach by connecting with authority bloggers in your domain area. Feedspot media database has over k Influential Bloggers in over niche categories. Email us us the type of bloggers you want to reach out at anuj feedspot. Top Programming blogs.