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Constructor and setter based Dependency injection code example

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This commit is contained in:
Vasudha Venkatesan
2020-02-17 22:46:46 +05:30
committed by akuksin
parent f1aa143b96
commit 3a929134ba
10 changed files with 294 additions and 0 deletions
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54
spring-boot/dependency-injection/pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.4.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>Example</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>Example</name>
<description>Demo project for dependency injection</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-core</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

22
spring-boot/dependency-injection/src/main/java/com/example/ExampleApplicationCI.java Normal file
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package com.example;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import com.example.constructorinjection.Cake;
@SpringBootApplication(scanBasePackages= {"com.example.constructorinjection","com.example.dependency"})
public class ExampleApplicationCI {
private static Logger LOGGER=LoggerFactory.getLogger(ExampleApplicationCI.class);
public static void main(String[] args) {
ApplicationContext context = SpringApplication.run(ExampleApplicationCI.class, args);
Cake obj = context.getBean(Cake.class);
LOGGER.info("Cake : "+ obj.toString());
}
}

22
spring-boot/dependency-injection/src/main/java/com/example/ExampleApplicationSI.java Normal file
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package com.example;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import com.example.setterinjection.Cake;
@SpringBootApplication(scanBasePackages= {"com.example.setterinjection","com.example.dependency"})
public class ExampleApplicationSI {
private static Logger LOGGER=LoggerFactory.getLogger(ExampleApplicationSI.class);
public static void main(String[] args) {
ApplicationContext context = SpringApplication.run(ExampleApplicationSI.class, args);
Cake obj = context.getBean(Cake.class);
LOGGER.info("Cake : "+ obj.toString());
}
}

38
spring-boot/dependency-injection/src/main/java/com/example/constructorinjection/Cake.java Normal file
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package com.example.constructorinjection;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import com.example.dependency.Flavor;
@Component
public class Cake {
private static Logger LOGGER = LoggerFactory.getLogger(Cake.class);
private Flavor flavor;
public Cake(Flavor flavor) throws IllegalAccessException {
//check if the required dependency is not null
if (flavor != null) {
this.flavor = flavor;
LOGGER.info("Flavor from Constructor Injection : " + flavor);
} else {
throw new IllegalArgumentException("Cake cannot be created with null flavor object");
}
}
public Flavor getFlavor() {
return flavor;
}
@Override
public String toString() {
return "Cake [flavor=" + flavor + "]";
}
}

25
spring-boot/dependency-injection/src/main/java/com/example/dependency/Flavor.java Normal file
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package com.example.dependency;
import org.springframework.stereotype.Component;
@Component
public class Flavor {
String flavorType = " Chocolate ";
String color = " White ";
public String getFlavorType() {
return flavorType;
}
public String getColor() {
return color;
}
@Override
public String toString() {
return "Flavor [flavorType=" + flavorType + ", color=" + color + "]";
}
}

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spring-boot/dependency-injection/src/main/java/com/example/dependency/Topping.java Normal file
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package com.example.dependency;
import org.springframework.stereotype.Component;
@Component
public class Topping {
private String toppingName;
public String getToppingName() {
return toppingName;
}
public void setToppingName(String toppingName) {
this.toppingName = toppingName;
}
@Override
public String toString() {
return "Topping [toppingName=" + toppingName + "]";
}
}

50
spring-boot/dependency-injection/src/main/java/com/example/setterinjection/Cake.java Normal file
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package com.example.setterinjection;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import com.example.dependency.Flavor;
import com.example.dependency.Topping;
@Component
public class Cake {
private Logger LOGGER = LoggerFactory.getLogger(Cake.class);
private Flavor flavor;
@Autowired
private Topping toppings;
public Cake() {
LOGGER.info("Flavor from setter Injection : " + this.flavor);
}
@Autowired
public void setFlavor(Flavor flavor) {
LOGGER.info("Initialising flavor object using setter injection");
this.flavor = flavor;
}
public Flavor getFlavor() {
return flavor;
}
public Topping getToppings() {
return toppings;
}
public void setToppings(Topping toppings) {
this.toppings = toppings;
}
@Override
public String toString() {
return "Cake [LOGGER=" + LOGGER + ", flavor=" + flavor + ", toppings=" + toppings + "]";
}
}

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spring-boot/dependency-injection/src/main/resources/application.properties Normal file
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spring.main.web-application-type=none
spring.main.banner-mode=off

25
spring-boot/dependency-injection/src/test/java/com/example/test/constructorinjection/TestCakeClassConstructorInjection.java Normal file
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package com.example.test.constructorinjection;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import com.example.ExampleApplicationCI;
import com.example.constructorinjection.Cake;
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = ExampleApplicationCI.class)
public class TestCakeClassConstructorInjection {
@Autowired
Cake cake;
@Test
public void testConstructorInjection() {
String testColor=cake.getFlavor().getColor();
Assert.assertEquals(testColor, " White ");
}
}

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spring-boot/dependency-injection/src/test/java/com/example/test/setterinjection/TestCakeClassSetterInjection.java Normal file
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package com.example.test.setterinjection;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import com.example.ExampleApplicationSI;
import com.example.setterinjection.Cake;
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = ExampleApplicationSI.class)
public class TestCakeClassSetterInjection {
@Autowired
Cake cake;
@Test
public void testSetterInjection() {
String testColor = cake.getFlavor().getColor();
Assert.assertEquals(testColor, " White ");
String toppingsName=cake.getToppings().getToppingName();
//check if the dependency is not null
if(toppingsName!=null) {
Assert.assertEquals(toppingsName, "gems");
}
}
}