micronaut@requestscope-不为每个传入的HTTP请求创建bean

Question

我有一个类，下面的类作为RequestScope bean：

@RequestScope
class RequestContext {

  private String requestId;
  private String traceId; 
  private String authorisedId; 
  private String routeName; 
    
  // few more fields 

  @Inject RequestContext(SecurityContext securityContext) {
        this.requestId = UUID.randomUUID().toString();
        if(securityService.getAuthentication().isPresent()){
          this.authorisedId = (securityService
                              .getAuthentication().get()).getUserId().toString();
    }
  }
  
  /* to be updated in controller method interceptors */ 
  public void updateRouteName(String name){
      this.routeName = name; 
  }

Answer 1

什么时候由Micronaut构建？

在请求处理期间创建@requestscopebean，这是第一次需要bean。

是不变的吗？

package rscope;

import io.micronaut.http.annotation.Controller;
import io.micronaut.http.annotation.Get;

@Controller("/")
public class DemoController {

    private final DemoBean demoBean;

    public DemoController(DemoBean demoBean) {
        this.demoBean = demoBean;
    }

    @Get("/doit")
    public String doit() {
        return String.format("Bean identity: %d", demoBean.getBeanIdentity());
    }
}

https://github.com/jeffbrown/rscope/blob/2935a4c1fc60f350198d7d3c1dbf9a7eedd333b3/src/main/java/rscope/demobean.java

package rscope;

import io.micronaut.runtime.http.scope.RequestScope;

@RequestScope
public class DemoBean {
    public DemoBean() {
    }

    public int getBeanIdentity() {
        return System.identityHashCode(this);
    }
}

https://github.com/jeffbrown/rscope/blob/2935a4c1fc60f350198d7d3c1dbf9a7eedd333b3/src/test/java/rscope/democontrollertest.java

package rscope;

import io.micronaut.http.client.RxHttpClient;
import io.micronaut.http.client.annotation.Client;
import io.micronaut.test.annotation.MicronautTest;
import org.junit.jupiter.api.Test;

import javax.inject.Inject;

import static org.junit.jupiter.api.Assertions.assertNotEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;

@MicronautTest
public class DemoControllerTest {

    @Inject
    @Client("/")
    RxHttpClient client;

    @Test
    public void testIndex() throws Exception {
        // these will contain the identity of the the DemoBean used to handle these requests
        String firstResponse = client.toBlocking().retrieve("/doit");
        String secondResponse = client.toBlocking().retrieve("/doit");

        assertTrue(firstResponse.matches("^Bean identity: \\d*$"));
        assertTrue(secondResponse.matches("^Bean identity: \\d*$"));

        // if you modify DemoBean to be @Singleton instead of
        // @RequestScope, this will fail because the same instance
        // will be used for both requests
        assertNotEquals(firstResponse, secondResponse);
    }
}