025. Configuration - dkkahm/study-springfamework5 GitHub Wiki

Java Configuration

@COnfiguration
public class ChuckConfiguration {

Bean

• Return type matter, not function name

    @Bean
    public ChuckNorrisQuotes chuckNorrisQuotes() {
        return new ChuckNorrisQuotes();
    }

• Using Bean

   @Autowired
   private ChuckNorrisQuotes chuckNorrisQuotes;

XML Configuration

• XML config file position
  • resources/cuck-config.xm
• Loading configuration

@SpringBootApplication
@ImportResource("classpath:chuck-config.xml")
public class JokeApplication {

Spring Factory Bean

• Factory

public class GreetingServiceFactory {
    private GreetingRepositsory repository;

    public GreetingServiceFactory (GreetingRepositsory repository) {
        this.repository = repository;
    }

    public GreetingService createGreetingService(String lang) {
        switch(lang) {
            case "en":
                return new PrimaryGreetingService(...);
            case "de":
                return new PrimaryGermanGreetingService(...);
        ....
    }

• Configuration

@Configuration
public class GreetingSeericeConfig {
    @Bean
    GreetingSericeFactory greetingSericeFactory(GreetingRepositsory repository) {
        return new GreetingServiceFactory(repository);
    }

    @Bean
    @Primary
    @Profile({"default", "en"})
    GreetingService primaryGreetingService(GreetingServiceFactory greetingServiceFactory) {
        return greetingServiceFactory.createGreetingService("en");
    }

    @Bean
    @Primary
    @Profile("es")
    GreetingService primarySpanishGreetingService(GreetingServiceFactory greetingServiceFactory) {
        return greetingServiceFactory.createGreetingService("es");
    }

    ....

Spring Boot Auto Configuration Report

• application.properties
  • debug=true
  • logging.level.root=debug
• command line arguments

1. add to build.gradle
bootRun {
	systemProperties = System.properties
}

2. run with -Ddebug=true
  gradlew bootRun -Ddebug=true

Spring Bean Scope

• Singleton
  • default
• Prototype
  • A new instance is created each time the bean is requested
• Request
  • A single instance per http request
• Session
  • A single instance per http session
• Applicaton
  • bean is scoped to the lifecyle of a ServletContext
• Websocket
  • Scopes a single bean definition to the lifecyle of a WebSocket
• Global-session
  • A single instance per global session
  • Typically Only used in a Portlet context
• In Java Configuration
  • Use @Scope annotation
• In XML Configuration
  • Use scope attribute