Some Other Spring
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Challenge : In Trendyol, we are developing a micro service project for integrate some third party systems. In this progress micro service will consume api over than Every api call using resources and managing these progress going to complex. We can not consume api in single thread, because every 2 hour starting new scheduler and progress should finish immediately. In this way we are choosing to use Asynchronous programming for this progress.
In fact looks like simple to call every api request in asynchronous, but there is a threshold. If we start to consume over than In dockerized application workflow, your micro service container will down and start again when system block and not responding.
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This mean you will lose the state of your application and you should start progress again. Because of these you should make your asynchronous threads scaleable and non blocking. Enabling to asynchronous functionality in Spring Boot is very easy with using EnableAsync annotation over any of Spring Boot configuration class. But managing is async not easy like this, you should analyze your application of how many threads will be running at same time and scalability.
After that you should define an Executor java. Executor implementation for manage your Async functions. Executor interface. In this article we will review ThreadPoolTaskExecutor implementation. For activating your custom executor, you should create an AsyncConfigurer implementation and override getAsyncExecutor function. Sample of ThreadPoolTaskExecutor definition is like following picture. The project was created using the always excellent Spring Initializr with the following configuration:.
To test it, open a terminal, navigate to the school-service directory, and run the command below:. The school UI is, as the name says, the user interface that utilizes School Service. It was created using Spring Initializr with the following options:. The UI is a single web page that lists the classes available on the database. As you can see, there is a hard-coded location for the service. You can change the property setting with an environment variable like this -Dservice.
Still, it has to be manually defined. How about having many instances of school-service application? Impossible at the current stage. Now, you have a working application that uses two services to provide the information to end-user. What is wrong with it? The deployment should be automated so that no one cares about server names and physical location. Unless you work inside a data center.
If you do, I hope you care! Nonetheless, it is essential to have a tool that helps the services to discover their counterparts. There are many solutions available, and for this tutorial, we are going to use Eureka from Netflix as it has outstanding Spring support. Go back to start. Edit the main DiscoveryApplication. The screen above shows the Eureka server ready to register new services. You can add JAXB dependencies to your pom.
First, it is important to add the required dependencies. Add the following to both pom.
In the application. You know what? Both applications are ready to register themselves into the discovery service. Our primary objective is that school-ui project does not need to know where school-service is. You can also remove the serviceHost variable in this class.
Before integrating Eureka, you had a configuration pointing out where school-service was. The school-service may have multiple instances of and it would be a good idea to load balance the calls between the instances. Thankfully, Spring has a simple solution: on the RestTemplate bean creation, add LoadBalanced annotation as follows.
Spring will manage multiple instance calls each time you ask something to the server. Now, start restart school-service and school-ui and keep the Discovery service up.
Chapter 3. The IoC container
Now, your services are sharing info with the Discovery server. You can test the application again and see that it work as always. First, the configuration URL was removed from the project and became managed by a service. Now, you can do a similar thing for every configuration on the project using Spring Cloud Config. First, create the configuration project using Spring Initializr and the following parameters:. Now, you need something to configure and apply to this example.
You can register for a free-forever developer account that will enable you to create as many user and applications you need to use! The page will return you an application ID and a secret key. Keep them safe and create a file called school-ui. Do not forget to populate the variable values:. Now, run the config project and check if it's getting the configuration data properly:.
Conditional Beans Creation In Spring Boot
Create a new SecurityConfiguration class in the com. Change your SchoolController so only users with scope profile will be allowed every authenticated user will have it. Some configurations need to be defined at project boot time. Spring had a clever solution to locate properly and extract configuration data before context startup. The bootstrap file creates a pre-boot Spring Application Context responsible for extracting configuration before the real application starts. You need to move all properties from application. In the example above, you enabled configuration over discovery service spring.
Change your application. Adjust it to show a login button if the user is not authenticated, and a logout button if the user is logged in. Now restart the configuration project and school-ui again. It can be applied to class-level or method-level. Integration tests, which require global configuration for all running SQL scripts, typically use the class-level approach whereas the method-level approach is for local configurations of certain methods:. The SpringBootTest annotation searches for the test class annotated with SpringBootConfiguration which in most cases is our main application class as SpringBootApplication includes the previous annotation within itself.
Once found, it constructs the application context for the test environment.
You can even start a web environment using the webEnvironment attribute:. It's applied on class-level and constructs an application context for all the Enitity classes, alongside an embedded database which is applied by default. Note : Regular Component classes are not loaded in the application context created by the DataJpaTest annotation.
It's used alongside the RunWith SpringRunner.
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By default, all of the JPA transactions will roll back you can change this behavior by applying either Rollback false or Commit :. This is a classic JPA test, though, if you'd like to use the real database, instead of the embedded in-memory database provided, you can simply add another annotation to prevent such behavior:.
Keep in mind that this annotation is used when the test it's applied to only tests MongoDB components and adds only Document classes to the application context:. Then again, if you'd like to run this with the real database, and not the in-memory embedded database provided by Mongo, you can exclude this option:. Keep in mind that the effects of this annotation only apply to the MVC infrastructure. That being said, it doesn't instantiate the whole context. The annotation can be used to test a single controller, by passing it as an attribute such as WebMvcTest SomeController. To instantiate other needed dependencies, such as services, we typically use the MockBean annotation.
When testing specific units, such as say, a controller, we want to isolate them as much as we can. Since most Spring Application components rely on a bunch of other components dependencies , it's quintessential to make sure these components are all individually testable. To successfully isolate the objects we want to test, while still allowing the application to work fine, we mock or simulate the dependencies. A MockBean annotation is used when we want to mock a dependency in an application:. In this example, the someBean dependency is simulating an actual dependency. If the bean exists in the context, the mock replaces it.
If it doesn't exist, the mock is added to the context as a bean. Note : There's a difference between the Mock and MockBean annotations. The Mock annotation comes from the Mockito library, and is equivalent to calling the Mockito. On the other hand, MockBean is the Spring library wrapper of the Mock annotation.