Added code for qualifier - https://jstobigdata.com/spring/fine-tune-auto-wiring-using-@primary-and-@qualifier/

Author: Bikraji

pom.xml

@@ -21,6 +21,7 @@
     <maven.compiler.target>1.8</maven.compiler.target>
     <maven.compiler.source>1.8</maven.compiler.source>
     <java.version>1.8</java.version>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
   </properties>
 
 

spring-core-ioc/src/main/java/basic/ioc/wiringfinetune/ConfigWiring.java

@@ -0,0 +1,38 @@
+package basic.ioc.wiringfinetune;
+
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
+
+@ComponentScan("basic.ioc.wiringfinetune")
+@Configuration
+public class ConfigWiring {
+
+  //bean name = insurance1
+  @Bean
+  @Primary
+  public Insurance insurance1(){
+    Insurance healthInsurance = new Insurance();
+    healthInsurance.setType("Health Insurance");
+    return healthInsurance;
+  }
+
+  //bean name = insurance2
+  @Bean
+  public Insurance insurance2(){
+    Insurance termInsurance = new Insurance();
+    termInsurance.setType("Term Insurance");
+    return termInsurance;
+  }
+
+  //bean name = insurance3
+  @Bean
+  @Qualifier("generalInsurance")
+  public Insurance insurance3() {
+    Insurance generalInsurance = new Insurance();
+    generalInsurance.setType("General Insurance");
+    return generalInsurance;
+  }
+}

spring-core-ioc/src/main/java/basic/ioc/wiringfinetune/FileReader.java

@@ -0,0 +1,5 @@
+package basic.ioc.wiringfinetune;
+
+public interface FileReader {
+  void print();
+}

spring-core-ioc/src/main/java/basic/ioc/wiringfinetune/Insurance.java

@@ -0,0 +1,13 @@
+package basic.ioc.wiringfinetune;
+
+public class Insurance {
+  private String type;
+
+  public String getType() {
+    return type;
+  }
+
+  public void setType(String type) {
+    this.type = type;
+  }
+}

spring-core-ioc/src/main/java/basic/ioc/wiringfinetune/PdfFileReader.java

@@ -0,0 +1,14 @@
+package basic.ioc.wiringfinetune;
+
+    import org.springframework.context.annotation.Primary;
+    import org.springframework.stereotype.Component;
+
+@Primary
+@Component
+public class PdfFileReader implements FileReader {
+
+  @Override
+  public void print() {
+    System.out.println("Inside PdfFileReader");
+  }
+}

spring-core-ioc/src/main/java/basic/ioc/wiringfinetune/WordFileReader.java

@@ -0,0 +1,12 @@
+package basic.ioc.wiringfinetune;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class WordFileReader implements FileReader {
+
+  @Override
+  public void print() {
+    System.out.println("Inside WordFileReader");
+  }
+}

spring-core-ioc/src/test/java/basic/ioc/wiringfinetune/FineTuneAutowiring.java

@@ -0,0 +1,51 @@
+package basic.ioc.wiringfinetune;
+
+import org.junit.Assert;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
+
+@SpringJUnitConfig(ConfigWiring.class)
+public class FineTuneAutowiring {
+
+  @Autowired
+  private FileReader fileReader;
+
+  @Test
+  public void testFileReader() {
+    Assert.assertNotNull(fileReader);
+    Assert.assertEquals(fileReader.getClass(), PdfFileReader.class);
+  }
+
+  @Autowired
+  private Insurance insurance;
+
+  @Test
+  public void testInsuranceBean(){
+    Assert.assertNotNull(insurance);
+    Assert.assertEquals(insurance.getType(), "Health Insurance");
+  }
+
+  //With Qualifier
+  @Autowired
+  @Qualifier("wordFileReader")
+  private FileReader fileReader2;
+
+  @Test
+  public void testWordFileReader() {
+    Assert.assertNotNull(fileReader2);
+    Assert.assertEquals(fileReader2.getClass(), WordFileReader.class);
+  }
+
+  @Autowired
+  //@Qualifier("insurance3")
+  @Qualifier("generalInsurance")
+  private Insurance myInsurance;
+
+  @Test
+  public void testInsuranceWithQualifier(){
+     Assert.assertNotNull(myInsurance);
+     Assert.assertEquals("General Insurance", myInsurance.getType());
+  }
+}