Introduction to Spring Boot - part 2

Hard Prerequisites
  • PROJECTS: Introduction to Spring Boot - part 1
  • TOPICS: Introduction to Spring Boot - part 2

    • We are going to work on Spring boot Caching and Security for this project

    Caching

    Continuing with PROJECTS: Introduction to Spring Boot - part 1 for the User we are going to add security and caching on the application and we will use test to see if the application does what we want it to.

    Step 1

    Import the following dependency

    dependencies {
    compile 'org.springframework.boot:spring-boot-starter-cache'
}

    Step 2

    Implement caching for the ‘name’ in the “getUser” method, use the right annotation to invoke this 😉, in order to see if something is being served from cache or not we are going to simulate our own delay.

    Add this code on your getUser method just before the return statement

    try
{
    System.out.println("Going to sleep for 5 Secs.. to simulate backend call.");
    Thread.sleep(1000*5);
}
catch (InterruptedException e)
{
    e.printStackTrace();
}

    because we don’t have a REST API for now (will be covered in Part3) we are going to use Tests to simulate a REST API call.

    Write a test that will call “getUser” four times

    Expect output after running “getUser” four times

    Without Cache:

    Going to sleep for 5 Secs.. to simulate backend call.
Going to sleep for 5 Secs.. to simulate backend call.
Going to sleep for 5 Secs.. to simulate backend call.
Going to sleep for 5 Secs.. to simulate backend call.

    With Cache:

    Going to sleep for 5 Secs.. to simulate backend call.
...
...
...

    Security

    Import the following dependency

    dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-security'
}

    Step 1

    Add the following class and provide implementation for the configure function where you see // COMPLETE CODE HERE specify your password and username.

    @Configuration
public class WebSecurityConfigurer extends WebSecurityConfigurerAdapter {
    // TODO: Read more about this extension WebSecurityConfigurerAdapter

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        // COMPLETE CODE HERE
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
                .antMatchers("/user")
                .authenticated()
                .antMatchers("/user")
                .permitAll()
                .and()
                .httpBasic();
    }
}

    Step 2

    Add a test to show that your username and password actually work by using the following

      @Autowired
    private TestRestTemplate template;

    ResponseEntity<String> response = template.withBasicAuth(?).getForEntity(?)

    Resource 😉

    https://howtodoinjava.com/spring-boot2/spring-boot-cache-example/

    https://www.baeldung.com/spring-security-integration-tests

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