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spring-boot-microservice-currency-conversion-service
spring-boot-microservice-currency-conversion-service
 
 
spring-boot-microservice-eureka-naming-server
spring-boot-microservice-eureka-naming-server
 
 
spring-boot-microservice-forex-service
spring-boot-microservice-forex-service
 
 
.gitignore
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readme.md
readme.md
 
 

readme.md

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Example Code

/spring-boot-microservice-currency-conversion-service/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http:https://maven.apache.org/POM/4.0.0" xmlns:xsi="http:https://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http:https://maven.apache.org/POM/4.0.0 http: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>3.0.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>com.in28minutes.springboot.microservice.example.currency-conversion</groupId>
    <artifactId>spring-boot-microservice-currency-conversion</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>spring-boot-microservice-currency-conversion</name>
    <description>Microservices with Spring Boot and Spring Cloud - Currency Conversion Service</description>

    <properties>
        <java.version>17</java.version>
        <spring-cloud.version>2022.0.0</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>


</project>

/spring-boot-microservice-currency-conversion-service/src/main/java/com/in28minutes/springboot/microservice/example/currencyconversion/CurrencyConversionBean.java

package com.in28minutes.springboot.microservice.example.currencyconversion;

import java.math.BigDecimal;

public record CurrencyConversionBean(Long id,
                                     String from,
                                     String to,
                                     BigDecimal conversionMultiple,
                                     BigDecimal quantity,
                                     BigDecimal totalCalculatedAmount,
                                     int port) {

}

/spring-boot-microservice-currency-conversion-service/src/main/java/com/in28minutes/springboot/microservice/example/currencyconversion/CurrencyConversionController.java

package com.in28minutes.springboot.microservice.example.currencyconversion;

import java.math.BigDecimal;
import java.util.HashMap;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class CurrencyConversionController {

    private final Logger LOGGER = LoggerFactory.getLogger(this.getClass());

    @Autowired
    private CurrencyExchangeServiceProxy proxy;

    @GetMapping("/currency-converter/from/{from}/to/{to}/quantity/{quantity}")
    public CurrencyConversionBean convertCurrency(@PathVariable String from,
                                                  @PathVariable String to,
                                                  @PathVariable BigDecimal quantity) {

        Map<String, String> uriVariables = new HashMap<>();
        uriVariables.put("from", from);
        uriVariables.put("to", to);

        ResponseEntity<CurrencyConversionBean> responseEntity = new RestTemplate().getForEntity(
                "http:https://localhost:8000/currency-exchange/from/{from}/to/{to}", CurrencyConversionBean.class,
                uriVariables);

        CurrencyConversionBean response = responseEntity.getBody();

        return new CurrencyConversionBean(response.id(), from, to, response.conversionMultiple(), quantity,
                quantity.multiply(response.conversionMultiple()), response.port());
    }

    @GetMapping("/currency-converter-feign/from/{from}/to/{to}/quantity/{quantity}")
    public CurrencyConversionBean convertCurrencyFeign(@PathVariable String from,
                                                       @PathVariable String to,
                                                       @PathVariable BigDecimal quantity) {

        CurrencyConversionBean response = proxy.retrieveExchangeValue(from, to);

        LOGGER.info("{}", response);

        return new CurrencyConversionBean(response.id(),
                from,
                to,
                response.conversionMultiple(),
                quantity,
                quantity.multiply(response.conversionMultiple()),
                response.port());
    }

}

/spring-boot-microservice-currency-conversion-service/src/main/java/com/in28minutes/springboot/microservice/example/currencyconversion/CurrencyExchangeServiceProxy.java

package com.in28minutes.springboot.microservice.example.currencyconversion;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;

@FeignClient(name = "forex-service")
public interface CurrencyExchangeServiceProxy {

    @GetMapping("/currency-exchange/from/{from}/to/{to}")
    CurrencyConversionBean retrieveExchangeValue(@PathVariable("from") String from,
                                                 @PathVariable("to") String to);
}

/spring-boot-microservice-currency-conversion-service/src/main/java/com/in28minutes/springboot/microservice/example/currencyconversion/SpringBootMicroserviceCurrencyConversionApplication.java

package com.in28minutes.springboot.microservice.example.currencyconversion;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication
@EnableFeignClients("com.in28minutes.springboot.microservice.example.currencyconversion")
@EnableDiscoveryClient
public class SpringBootMicroserviceCurrencyConversionApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringBootMicroserviceCurrencyConversionApplication.class, args);
    }
}

/spring-boot-microservice-currency-conversion-service/src/main/resources/application.properties

spring.application.name=currency-conversion-service
server.port=8100
eureka.client.service-url.default-zone=http:https://localhost:8761/eureka

/spring-boot-microservice-currency-conversion-service/src/test/java/com/in28minutes/springboot/microservice/example/currencyconversion/SpringBootMicroserviceCurrencyConversionApplicationTests.java

package com.in28minutes.springboot.microservice.example.currencyconversion;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit.jupiter.SpringExtension;

@ExtendWith(SpringExtension.class)
@SpringBootTest
public class SpringBootMicroserviceCurrencyConversionApplicationTests {

    @Test
    public void contextLoads() {
    }

}

/spring-boot-microservice-eureka-naming-server/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http:https://maven.apache.org/POM/4.0.0" xmlns:xsi="http:https://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http:https://maven.apache.org/POM/4.0.0 http: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>3.0.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>com.in28minutes.springboot.microservice.eureka.naming.server</groupId>
    <artifactId>spring-boot-microservice-eureka-naming-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>spring-boot-microservice-eureka-naming-server</name>
    <description>Microservices with Spring Boot and Spring Cloud - Eureka Naming Server</description>

    <properties>
        <java.version>17</java.version>
        <spring-cloud.version>2022.0.0</spring-cloud.version> <!-- aka Jubilee -->
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>

</project>

/spring-boot-microservice-eureka-naming-server/src/main/java/com/in28minutes/springboot/microservice/eureka/naming/server/SpringBootMicroserviceEurekaNamingServerApplication.java

package com.in28minutes.springboot.microservice.eureka.naming.server;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer
public class SpringBootMicroserviceEurekaNamingServerApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringBootMicroserviceEurekaNamingServerApplication.class, args);
    }
}

/spring-boot-microservice-eureka-naming-server/src/main/resources/application.properties

spring.application.name=netflix-eureka-naming-server
server.port=8761
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false

/spring-boot-microservice-eureka-naming-server/src/test/java/com/in28minutes/springboot/microservice/eureka/naming/server/SpringBootMicroserviceEurekaNamingServerApplicationTests.java

package com.in28minutes.springboot.microservice.eureka.naming.server;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit.jupiter.SpringExtension;

@ExtendWith(SpringExtension.class)
@SpringBootTest
public class SpringBootMicroserviceEurekaNamingServerApplicationTests {

    @Test
    public void contextLoads() {
    }

}

/spring-boot-microservice-forex-service/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http:https://maven.apache.org/POM/4.0.0" xmlns:xsi="http:https://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http:https://maven.apache.org/POM/4.0.0 http: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>3.0.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>com.in28minutes.springboot.microservice.example.forex</groupId>
    <artifactId>spring-boot-microservice-forex-service</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>spring-boot-microservice-forex-service</name>
    <description>Microservices with Spring Boot and Spring Cloud - Forex Service</description>

    <properties>
        <java.version>17</java.version>
        <spring-cloud.version>2022.0.0</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>

</project>

/spring-boot-microservice-forex-service/src/main/java/com/in28minutes/springboot/microservice/example/forex/ExchangeValue.java

package com.in28minutes.springboot.microservice.example.forex;

import java.math.BigDecimal;

import jakarta.persistence.Column;
import jakarta.persistence.Entity;
import jakarta.persistence.Id;

@Entity
public class ExchangeValue {

    @Id
    private Long id;

    @Column(name = "currency_from")
    private String from;

    @Column(name = "currency_to")
    private String to;

    private BigDecimal conversionMultiple;

    private int port;

    public ExchangeValue() {

    }

    public ExchangeValue(Long id, String from, String to, BigDecimal conversionMultiple) {
        super();
        this.id = id;
        this.from = from;
        this.to = to;
        this.conversionMultiple = conversionMultiple;
    }

    public Long getId() {
        return id;
    }

    public String getFrom() {
        return from;
    }

    public String getTo() {
        return to;
    }

    public BigDecimal getConversionMultiple() {
        return conversionMultiple;
    }

    public int getPort() {
        return port;
    }

    public void setPort(int port) {
        this.port = port;
    }

}

/spring-boot-microservice-forex-service/src/main/java/com/in28minutes/springboot/microservice/example/forex/ExchangeValueRepository.java

package com.in28minutes.springboot.microservice.example.forex;

import org.springframework.data.jpa.repository.JpaRepository;

public interface ExchangeValueRepository extends JpaRepository<ExchangeValue, Long> {

    ExchangeValue findByFromAndTo(String from, String to);
}

/spring-boot-microservice-forex-service/src/main/java/com/in28minutes/springboot/microservice/example/forex/ForexController.java

package com.in28minutes.springboot.microservice.example.forex;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ForexController {

    @Autowired
    private Environment environment;

    @Autowired
    private ExchangeValueRepository repository;

    @GetMapping("/currency-exchange/from/{from}/to/{to}")
    public ExchangeValue retrieveExchangeValue(@PathVariable String from,
                                               @PathVariable String to) {

        ExchangeValue exchangeValue = repository.findByFromAndTo(from, to);

        exchangeValue.setPort(Integer.parseInt(environment.getProperty("local.server.port")));

        return exchangeValue;
    }
}

/spring-boot-microservice-forex-service/src/main/java/com/in28minutes/springboot/microservice/example/forex/SpringBootMicroserviceForexServiceApplication.java

package com.in28minutes.springboot.microservice.example.forex;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient
public class SpringBootMicroserviceForexServiceApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringBootMicroserviceForexServiceApplication.class, args);
    }
}

/spring-boot-microservice-forex-service/src/main/resources/application.properties

spring.application.name=forex-service
server.port=8000
# Enabling H2 Console
spring.h2.console.enabled=true
#Turn Statistics on
#spring.jpa.properties.hibernate.generate_statistics=true
#logging.level.org.hibernate.stat=debug
# Show all queries
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.format_sql=true
logging.level.org.hibernate.type=trace
spring.datasource.url=jdbc:h2:mem:testdb
spring.data.jpa.repositories.bootstrap-mode=default
spring.jpa.defer-datasource-initialization=true
eureka.client.service-url.default-zone=http:https://localhost:8761/eureka

/spring-boot-microservice-forex-service/src/main/resources/data.sql

insert into exchange_value(id,currency_from,currency_to,conversion_multiple,port)
values(10001,'USD','INR',65,0);
insert into exchange_value(id,currency_from,currency_to,conversion_multiple,port)
values(10002,'EUR','INR',75,0);
insert into exchange_value(id,currency_from,currency_to,conversion_multiple,port)
values(10003,'AUD','INR',25,0);

/spring-boot-microservice-forex-service/src/test/java/com/in28minutes/springboot/microservice/example/forex/SpringBootMicroserviceForexServiceApplicationTests.java

package com.in28minutes.springboot.microservice.example.forex;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit.jupiter.SpringExtension;

@ExtendWith(SpringExtension.class)
@SpringBootTest
public class SpringBootMicroserviceForexServiceApplicationTests {

    @Test
    public void contextLoads() {
    }

}