Added a new module (spring-core-5) for the code examples of BAEL-4764. (#10484)

2021-02-13 14:29:50 -06:00
parent 89eb93a46c
commit 354018732d
22 changed files with 236 additions and 2 deletions
@@ -0,0 +1,4 @@
+package com.baeldung.component.inscope;
+
+public interface AmbiguousBean {
+}
@@ -0,0 +1,4 @@
+package com.baeldung.component.inscope;
+
+public class BeanExample {
+}
@@ -0,0 +1,4 @@
+package com.baeldung.component.inscope;
+
+public class BeanImplA implements AmbiguousBean {
+}
@@ -0,0 +1,4 @@
+package com.baeldung.component.inscope;
+
+public class BeanImplB implements AmbiguousBean {
+}
@@ -0,0 +1,42 @@
+package com.baeldung.component.inscope;
+
+import com.baeldung.component.outsidescope.OutsideScopeBeanExample;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+
+@SpringBootApplication
+@ComponentScan({"com.baeldung.component.inscope", "com.baeldung.component.scannedscope"})
+@Configuration
+public class ComponentApplication {
+
+    @Value( "${ambiguous-bean}" )
+    public String ambiguousBean;
+
+    public static void main(String[] args) {
+        SpringApplication.run( ComponentApplication.class, args );
+    }
+
+    @Bean
+    public BeanExample beanExample() {
+        return new BeanExample();
+    }
+
+    @Bean
+    public OutsideScopeBeanExample outsideScopeBeanExample() {
+        return new OutsideScopeBeanExample();
+    }
+
+    @Bean
+    public AmbiguousBean ambiguousBean() {
+        if (ambiguousBean.equals("A")) {
+            return new BeanImplA();
+        }
+        else {
+            return new BeanImplB();
+        }
+    }
+}
@@ -0,0 +1,7 @@
+package com.baeldung.component.inscope;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class ComponentExample {
+}
@@ -0,0 +1,7 @@
+package com.baeldung.component.inscope;
+
+import org.springframework.stereotype.Controller;
+
+@Controller
+public class ControllerExample {
+}
@@ -0,0 +1,14 @@
+package com.baeldung.component.inscope;
+
+import org.springframework.stereotype.Component;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({ElementType.TYPE})
+@Retention(RetentionPolicy.RUNTIME)
+@Component
+public @interface CustomComponent {
+}
@@ -0,0 +1,5 @@
+package com.baeldung.component.inscope;
+
+@CustomComponent
+public class CustomComponentExample {
+}
@@ -0,0 +1,7 @@
+package com.baeldung.component.inscope;
+
+import org.springframework.stereotype.Repository;
+
+@Repository
+public class RepositoryExample {
+}
@@ -0,0 +1,7 @@
+package com.baeldung.component.inscope;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class ServiceExample {
+}
@@ -0,0 +1,4 @@
+package com.baeldung.component.outsidescope;
+
+public class OutsideScopeBeanExample {
+}
@@ -0,0 +1,7 @@
+package com.baeldung.component.outsidescope;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class OutsideScopeExample {
+}
@@ -0,0 +1,7 @@
+package com.baeldung.component.scannedscope;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class ScannedScopeExample {
+}
@@ -0,0 +1 @@
+ambiguous-bean: 'A'
@@ -0,0 +1,54 @@
+package com.baeldung.component.inscope;
+
+import com.baeldung.component.outsidescope.OutsideScopeBeanExample;
+import com.baeldung.component.outsidescope.OutsideScopeExample;
+import com.baeldung.component.scannedscope.ScannedScopeExample;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.beans.factory.NoSuchBeanDefinitionException;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.ApplicationContext;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@SpringBootTest
+@ExtendWith(SpringExtension.class)
+public class ComponentUnitTest {
+
+    @Autowired
+    private ApplicationContext applicationContext;
+
+    @Test
+    public void givenInScopeComponents_whenSearchingInApplicationContext_thenFindThem() {
+        assertNotNull(applicationContext.getBean(ControllerExample.class));
+        assertNotNull(applicationContext.getBean(ServiceExample.class));
+        assertNotNull(applicationContext.getBean(RepositoryExample.class));
+        assertNotNull(applicationContext.getBean(ComponentExample.class));
+        assertNotNull(applicationContext.getBean(CustomComponentExample.class));
+    }
+
+    @Test
+    public void givenOutsideScopeComponent_whenSearchingInApplicationContext_thenFail() {
+        assertThrows(NoSuchBeanDefinitionException.class, () -> applicationContext.getBean(OutsideScopeExample.class));
+    }
+
+    @Test
+    public void givenScannedScopeComponent_whenSearchingInApplicationContext_thenFindIt() {
+        assertNotNull(applicationContext.getBean(ScannedScopeExample.class));
+    }
+
+    @Test
+    public void givenBeanComponents_whenSearchingInApplicationContext_thenFindThem() {
+        assertNotNull(applicationContext.getBean(BeanExample.class));
+        assertNotNull(applicationContext.getBean(OutsideScopeBeanExample.class));
+    }
+
+    @Test
+    public void givenAmbiguousBeanSetToB_whenSearchingInApplicationContext_thenFindImplB() {
+        AmbiguousBean ambiguousBean = applicationContext.getBean(AmbiguousBean.class);
+        assertNotNull(ambiguousBean);
+        assertTrue(ambiguousBean instanceof BeanImplB);
+    }
+}
@@ -0,0 +1 @@
+ambiguous-bean: 'B'