TechTalk - Gradle + Spring Boot + Groovy - Application.groovy (Web Application)

application.groovy

import br.com.smc.meurumo.config.ConfigProperties
import com.paypal.base.rest.APIContext
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.boot.SpringApplication
import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainer
import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer
import org.springframework.boot.web.servlet.ErrorPage
import org.springframework.context.annotation.Bean
import org.springframework.http.HttpStatus

import java.util.concurrent.ExecutorService
import java.util.concurrent.Executors

/**
 * Classe de inicialização do Spring Boot.
 */
@SpringBootApplication
class Application {

	/**
	 * Método de inicialização.
	 * @param args
	 */
	public static void main(String[] args) {

		SpringApplication.run(Application.class, args)
	}

	/**
	 * Configuração global para tratamento de erros HTTP e redirecionamento para a página apropriada.
	 */
	@Bean
	EmbeddedServletContainerCustomizer containerCustomizer() {
		return new EmbeddedServletContainerCustomizer() {
			@Override
			public void customize(ConfigurableEmbeddedServletContainer container) {
				ErrorPage error404Page = new ErrorPage(HttpStatus.NOT_FOUND, "/error/404")
				ErrorPage error405Page = new ErrorPage(HttpStatus.METHOD_NOT_ALLOWED, "/error/404")
				ErrorPage globalErrorPage = new ErrorPage("/error/500")
				container.addErrorPages(error404Page)
				container.addErrorPages(error405Page)
				container.addErrorPages(globalErrorPage)
			}
		};
	}

	/**
	 * Executor responsável por gerenciar as threads usadas no paralelismo da aplicaçao.
	 * @return
	 */
	@Bean
	ExecutorService threadExecutorService() {
		ExecutorService executor = Executors.newFixedThreadPool(10)
		return executor
	}

	/**
	 * Componente configurado do Paypal para efetuar os fluxos transacionais de pagamento.
	 * @return
	 */
	@Bean
	APIContext paypalApiContext() {
		APIContext context = new APIContext(config.paypalClientId , config.paypalClientSecret, config.paypalEnvironment);
		return context
	}


	/* Componentes injetados */

	@Autowired
	ConfigProperties config
}