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CAS – konfiguracja aplikacji klienta cz. 2

14 April 2016 No Comments

W poprzednim poście opisywałem konfigurację aplikacji dostawcy tożsamości. W tej części przejdziemy przez zagadnienia integracji CAS z naszą aplikacją za pomocą biblioteki Pac4J.

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Hi there! My name is Mateusz.
I've been programming since I was 12. Over this time, I've turned my youthful passion into a profession. On this blog, I write about my experiences, thoughts, and programming problems.
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@hunt.the.semicolon

Synchronous vs. asynchronous communication. • Wh Synchronous vs. asynchronous communication. • What is the difference between synchronous and asynchronous communication? Only the fact that you wait or not for the response when sending a request. • However, this small difference causes a lot of decisions to be made when implementing your backend service. • Let's consider an example - you want to implement user registration. The only constraint is that a username cannot be in use. • How you implement so with synchronous communication? The app receives a request, reads the username value, and checks if a user with this username exists. If not, a new user is added to the database and then some confirmation is returned. If a user already exists, the app returns a notification that the user cannot be registered. • Handling such a simple scenario with asynchronous communication gets a bit more complicated. Since it is an asynchronous request, when a user clicks the Register button, the notification like "We will register your account soon. Check the inbox for the activation link." is displayed immediately. In the meantime, the app is processing the request. It performs the same validation steps. If a username is already in use, you should somehow notify the user. How? He or she is no longer waiting for the response. • Well...there are many approaches to handling such problems. The most popular solution is to send an email and ask the user for changing the account name and go through the registration process again. • As you can see, a small decision on communication rules affected the actual business process. Keep this in mind when designing new features :) • #programming #coding #programmer #developer #code #technology #javascript #coder #java #webdeveloper #tech #software #codinglife #webdevelopment #programmers #softwaredeveloper #programminglife #webdesign #machinelearning #development #computer #bhfyp #hacking #codingdays #codesyndicate #codeparel #codeworldofficial #codecollect #lovecoders
Event-driven architecture. • An event is a small Event-driven architecture. • An event is a small portion of data, which represents something that has happened in the system, eg. UserAccountCreated, PasswordChanged. It should have its own, unique name, structure, and metadata. • When an application wants to communicate something, then it publishes an event. Every other service interested in the given fact subscribes to a certain type of events. • There are many advantages of event-driven architecture. First of all, it is effortless to scale. All the communication is asynchronous, so the publisher does not have to wait for a response. A broker takes care of all the load balancing work. • Moreover, there are no strong dependencies between applications. The communication relays on small events that are not frequently changing their structure. • Unfortunately, event-driven architecture has some disadvantages. It is hard to investigate errors due to loosely coupled communication. • Every developer should pay much attention to logging essential data or developing a system that helps with analyzing incidents. The other disadvantage is asynchronous communication. • Some systems cannot rely on such a communication model and require the response to be back within milliseconds. • Check the link in the BIO section if you’re interested in more details. • #programming #coding #programmer #developer #code #technology #javascript #coder #java #webdeveloper #tech #software #codinglife #webdevelopment #programmers #softwaredeveloper #programminglife #webdesign #machinelearning #development #computer #bhfyp #hacking #codingdays #codesyndicate #codeparel #codeworldofficial #codecollect #lovecoders
CQRS (Command Query Responsibility Segregation). • Every application does two things - read and write data. Depending on the architecture of your application, you probably have some kind of service that is responsible for managing a part of your domain. Let's say it's a CarService. What does this service do? Well...it adds, edits, or even deletes cars from a repository. • What is the problem with this solution? First of all, the service is gonna be big. Secondly, the data model in the repository is probably driven by the data representation, e.g. UI. What will happen when UI will change or there will be a second way of displaying data? It may happen that the service you wrote won't be optimized to actually meet the new requirements. • In such cases, CQRS will help you. CQRS splits your service model into many, smaller classes optimized for update and display requirements. • CQRS introduces two main concepts. Commands which modify data, and queries which query for data. In such a scenario, your CarService might be split into CarWriteService, CarReadUIService, and CarReadMobileService. The first one will handle all the commands and will be optimized for data modifications. The second and third ones will be optimized for displaying data (handling queries) for two different purposes. • You can go a step further and split your data model repository level. This might be extremely useful whenever you spot any performance issues with either writing or reading data. • Additionally, you got some more flexibility and testability by splitting the services. Of course, CQRS is more complicated and I really recommend you read about it more. • Have you ever heard about CQRS before? • #programming #coding #programmer #developer #code #technology #javascript #coder #java #webdeveloper #tech #software #codinglife #webdevelopment #programmers #softwaredeveloper #programminglife #webdesign #machinelearning #development #computer #bhfyp #hacking #codingdays #codesyndicate #codeparel #codeworldofficial #codecollect #lovecoders
I love developing side projects ❤️ • Do you I love developing side projects ❤️ • Do you know what the best thing is? I can use all the newest technologies and play a little bit with them. • There is a big difference when choosing a technology stack for a long-living-commercial app and a small project. • You need to select mature and supported versions of technologies. The team will maintain the app for many years. It will be extremally dangerous to choose not stable dependencies or choose an architecture you are not fluent at. • What it looks like in a side project? Well, you can do whatever you want. I would even recommend using the latest releases of your favorite technologies and implement the architectures that you are afraid of. Play with them, find bugs, and have fun. You will find pros and cons in every one of them. • This is how we build programming expertise - we use many technologies and try them on safe playground. • What was the last thing that you learned when building your side project? • #programming #coding #programmer #developer #code #technology #javascript #coder #java #webdeveloper #tech #software #codinglife #webdevelopment #programmers #softwaredeveloper #programminglife #webdesign #machinelearning #development #computer #bhfyp #hacking #codingdays #codesyndicate #codeparel #codeworldofficial #codecollect #lovecoders
I went through this book for the first time about I went through this book for the first time about five years ago. I didn’t understand much. I was a junior developer with not so much experience. • I got some basic ideas, naming, and patterns, but had no clue how to use them in business applications. • I decided to return to this book five years later. As I’m reading it, I get an insight into how much I didn’t understand where programming and business cross their lines. • Back then, I concentrated only on all the language features. Business requirements were just an addition. It has shifted over the years. Now, for me, the business requirements are the core of the problem. A language is just a tool. • Within these years of my career, I understood that the clue of programming is understanding business and solving its problems. • Language features are not important at all. They help you to solve the problems that the business has. • #huntthesemicolon #programming #programminglife #programmingisfun #programmingstudents #programmingproblems #computerscience #computersciencemajor #computerscienceforall #computersciencestudent #student #computersciences #developer #developers #developerdiaries #developerlife #developerslife #projectmanager #frontend #frontenddeveloper #frontenddev #backend #backenddeveloper #backenddevelopment #learning #learningisfun #ddd #domaindrivendesign
There is a stereotype that programmers are those n There is a stereotype that programmers are those nerdy guys who spend entire days in their basements. They do play games and eat a lot of pizzas. • Maybe it used to be like that, but this has certainly changed in recent years. • Now programmers are aware that sitting long hours in front of a computer may cause a lot of problems. They started working out, running, cycling, or whatever they like to keep their bodies healthy. • I find sports extremely important in my life. It helps me to stay balanced with the things I’m involved in. The body is provided with some activities that mobilize muscles and blood systems. The mind is refreshed, restarted, and kept in order. • Really recommend it to everyone! • #huntthesemicolon #programming #programminglife #programmingisfun #programmingstudents #programmingproblems #computerscience #computersciencemajor #computerscienceforall #computersciencestudent #student #computersciences #developer #developers #developerdiaries #developerlife #developerslife #projectmanager #frontend #frontenddeveloper #frontenddev #backend #backenddeveloper #backenddevelopment #learning #learningisfun #learningthroughplay
Me and my serious face while doing code review. • I find CR as a crucial part of software development. There are many advantages to having it in your process. • First of all, more people are reading code. They find small bugs, corner cases, or even wrong naming conventions. • Secondly, it helps in knowledge sharing. When a developer is doing a CR, he or she has to understand what is going on. It means that they analyze code and try to understand the business process. • Finally, code review increases your soft skills. You cannot go to your colleague and say that something is bad. You should be polite and motivate your opinion - "I think that this line might cause some concurrency issues, because...". • I love being both a reviewer and reviewed. I find it the fastest way of learning new language features or APIs capabilities. • Many code reviews made me feel miserable - 700 lines of change, 70 comments. However, I understood that there is nothing to worry about. This is an integral part of the learning process. • Do you have any tips for effective code review? Do you like being reviewed? Do you find it useful in any way? • #huntthesemicolon #programming #programminglife #programmingisfun #programmingstudents #programmingproblems #computerscience #computersciencemajor #computerscienceforall #computersciencestudent #student #computersciences #developer #developers #developerdiaries #developerlife #developerslife #projectmanager #frontend #frontenddeveloper #frontenddev #backend #backenddeveloper #backenddevelopment #learning #learningisfun #learningthroughplay
Already got an autumn mood 🍂 . Hopefully, long Already got an autumn mood 🍂 . Hopefully, long and dark evenings will result in some interesting projects. . Today I found out an idea for a project that I want to develop in the next few months. It is going to be investment related app. More details soon ;) #programming #programinglife #programingisfun #computerscience #developer #developerslife #huntthesemicolon
I hope you had a great weekend! • I was planning I hope you had a great weekend! • I was planning to do many things this weekend. Well...I ended up reading for the majority of the time 📚 • I had a stressful week at work and needed to rest a bit. From the first two hours of Monday, I can say that I needed a lazy weekend. I have more energy for the upcoming week🏃‍♂️ • I finished a book that I have been reading for the last couple of months - "Benjamin Franklin" by Walter Isaacson. I will cover it in one of the future posts since that is a great history of one of the United States creators. • While writing this post I just realized a funny coincidence. Benjamin Franklin was one of the Founding Fathers of the United States who signed the Declaration of Independence. • Americans just have sent their American racket to the International Space Station. This means that they are independent again 💪 Of course independent in a different context. • Funny, isn't it? • As you can see, I didn't do any programming this weekend 😂 I hope is gonna change soon! • How was your weekend? What were you up to? • #huntthesemicolon #programming #programminglife #programmingisfun #programmingstudents #programmingproblems #computerscience #computersciencemajor #computerscienceforall #computersciencestudent #student #computersciences #developer #developers #developerdiaries #developerlife #developerslife #frontend #frontenddeveloper #frontenddev #backend #backenddeveloper #backenddevelopment #learning #bookstagram #instabooks #weekend #spacex
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