Микросервисы со Spring Boot. Часть 2. Создание микросервиса Forex

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

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <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>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.0.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
    <spring-cloud.version>Finchley.M8</spring-cloud.version>
  </properties>

  <dependencies>
    <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-snapshots</id>
      <name>Spring Snapshots</name>
      <url>https://repo.spring.io/snapshot</url>
      <snapshots>
        <enabled>true</enabled>
      </snapshots>
    </repository>
    <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-snapshots</id>
      <name>Spring Snapshots</name>
      <url>https://repo.spring.io/snapshot</url>
      <snapshots>
        <enabled>true</enabled>
      </snapshots>
    </pluginRepository>
    <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 javax.persistence.Column;
import javax.persistence.Entity;
import javax.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

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 java.math.BigDecimal;

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;

@SpringBootApplication
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

spring.jpa.show-sql=true
spring.h2.console.enabled=true

/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.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringBootMicroserviceForexServiceApplicationTests {

  @Test
  public void contextLoads() {
  }

}