create new service exchange to and from amount

create unit test service layer
using spring cacheable cache every 1 minute and
using feign

Author: FaridQuluzada

build.gradle

@@ -24,9 +24,13 @@ ext {
 
 dependencies {
     implementation 'org.springframework.boot:spring-boot-starter-web'
+    implementation 'org.springframework.boot:spring-boot-starter-validation'
+    implementation 'org.springframework.boot:spring-boot-starter-aop'
     implementation 'org.springframework.cloud:spring-cloud-starter-openfeign'
     compileOnly 'org.projectlombok:lombok'
     annotationProcessor 'org.projectlombok:lombok'
+    implementation "javax.validation:validation-api:${javaxValidationVersion}"
+
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
 }
 

gradle.properties

@@ -0,0 +1,2 @@
+mapstructVersion=1.4.2.Final
+javaxValidationVersion=2.0.1.Final

src/main/java/az/unitech/development/exchange/client/CurrencyClient.java

@@ -0,0 +1,18 @@
+package az.unitech.development.exchange.client;
+
+import az.unitech.development.exchange.client.model.CurrencyResponse;
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+
+@FeignClient(name = "fastforex",
+        url = "${api.fastforex.io}",
+        primary = false,
+        contextId = "currency-rates"
+)
+public interface CurrencyClient {
+
+    @GetMapping(value = "/fetch-all")
+    CurrencyResponse getRatesBaseUSD(@RequestParam("api_key") String apiKey);
+
+}

src/main/java/az/unitech/development/exchange/client/model/CurrencyResponse.java

@@ -0,0 +1,14 @@
+package az.unitech.development.exchange.client.model;
+
+import lombok.Data;
+
+import java.math.BigDecimal;
+import java.util.Map;
+
+@Data
+public class CurrencyResponse {
+
+    private String base;
+    private Map<String, BigDecimal> results;
+
+}

src/main/java/az/unitech/development/exchange/config/ApplicationPropertyConfiguration.java

@@ -0,0 +1,10 @@
+package az.unitech.development.exchange.config;
+
+import az.unitech.development.exchange.config.properties.CurrencyClientProperties;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@EnableConfigurationProperties(CurrencyClientProperties.class)
+public class ApplicationPropertyConfiguration {
+}

src/main/java/az/unitech/development/exchange/config/FeignClientConfiguration.java

@@ -0,0 +1,9 @@
+package az.unitech.development.exchange.config;
+
+import org.springframework.cloud.openfeign.EnableFeignClients;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@EnableFeignClients(basePackages = "az.unitech.development.exchange.client")
+public class FeignClientConfiguration {
+}

src/main/java/az/unitech/development/exchange/config/SchedulerConfiguration.java

@@ -0,0 +1,9 @@
+package az.unitech.development.exchange.config;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.scheduling.annotation.EnableScheduling;
+
+@Configuration
+@EnableScheduling
+public class SchedulerConfiguration {
+}

src/main/java/az/unitech/development/exchange/config/cache/CacheConfiguration.java

@@ -0,0 +1,9 @@
+package az.unitech.development.exchange.config.cache;
+
+import org.springframework.cache.annotation.EnableCaching;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@EnableCaching
+public class CacheConfiguration {
+}

src/main/java/az/unitech/development/exchange/config/cache/CacheEvictScheduler.java

@@ -0,0 +1,16 @@
+package az.unitech.development.exchange.config.cache;
+
+import az.unitech.development.exchange.config.properties.ApplicationConstants;
+import org.springframework.cache.annotation.CacheEvict;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Component;
+
+@Component
+public class CacheEvictScheduler {
+
+    @Scheduled(fixedDelay = ApplicationConstants.TIME_UNIT_MINUTE)
+    @CacheEvict(ApplicationConstants.CACHE_CURRENCY)
+    public void evictCurrencyCache() {
+    }
+
+}

src/main/java/az/unitech/development/exchange/config/properties/ApplicationConstants.java

@@ -0,0 +1,11 @@
+package az.unitech.development.exchange.config.properties;
+
+public final class ApplicationConstants {
+
+    public static final String CACHE_CURRENCY = "cacheCurrency";
+    public static final long TIME_UNIT_MINUTE = 60 * 1000L;
+
+    private ApplicationConstants() {
+    }
+
+}

src/main/java/az/unitech/development/exchange/config/properties/CurrencyClientProperties.java

@@ -0,0 +1,20 @@
+package az.unitech.development.exchange.config.properties;
+
+import lombok.Data;
+import lombok.Getter;
+import lombok.Setter;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+@Getter
+@Setter
+@ConfigurationProperties("api")
+public class CurrencyClientProperties {
+
+    public FastForex fastForex= new FastForex();
+
+    @Data
+    public static class FastForex {
+        private String apiKey;
+    }
+
+}

src/main/java/az/unitech/development/exchange/controller/ExchangeController.java

@@ -0,0 +1,25 @@
+package az.unitech.development.exchange.controller;
+
+import az.unitech.development.exchange.dto.request.ExchangeRequest;
+import az.unitech.development.exchange.dto.response.ExchangeResponse;
+import az.unitech.development.exchange.service.ExchangeService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import javax.validation.Valid;
+
+@RestController
+@RequestMapping("/exchange")
+@RequiredArgsConstructor
+public class ExchangeController {
+
+    private final ExchangeService exchangeService;
+
+    @GetMapping("/calculate")
+    public ExchangeResponse calculate(@Valid ExchangeRequest exchangeRequest) {
+        return exchangeService.calculate(exchangeRequest);
+    }
+
+}

src/main/java/az/unitech/development/exchange/dto/Currencies.java

@@ -0,0 +1,191 @@
+package az.unitech.development.exchange.dto;
+
+public enum Currencies {
+
+    AED,
+    AFN,
+    ALL,
+    AMD,
+    ANG,
+    AOA,
+    ARS,
+    AUD,
+    AWG,
+    AZN,
+    BAM,
+    BBD,
+    BDT,
+    BGN,
+    BHD,
+    BIF,
+    BMD,
+    BND,
+    BOB,
+    BOV,
+    BRL,
+    BSD,
+    BTN,
+    BWP,
+    BYN,
+    BZD,
+    CAD,
+    CDF,
+    CHE,
+    CHF,
+    CHW,
+    CLF,
+    CLP,
+    CNY,
+    COP,
+    COU,
+    CRC,
+    CUC,
+    CUP,
+    CVE,
+    CZK,
+    DJF,
+    DKK,
+    DOP,
+    DZD,
+    EGP,
+    ERN,
+    ETB,
+    EUR,
+    FJD,
+    FKP,
+    GBP,
+    GEL,
+    GHS,
+    GIP,
+    GMD,
+    GNF,
+    GTQ,
+    GYD,
+    HKD,
+    HNL,
+    HRK,
+    HTG,
+    HUF,
+    IDR,
+    ILS,
+    INR,
+    IQD,
+    IRR,
+    ISK,
+    JMD,
+    JOD,
+    JPY,
+    KES,
+    KGS,
+    KHR,
+    KMF,
+    KPW,
+    KRW,
+    KWD,
+    KYD,
+    KZT,
+    LAK,
+    LBP,
+    LKR,
+    LRD,
+    LSL,
+    LYD,
+    MAD,
+    MDL,
+    MGA,
+    MKD,
+    MMK,
+    MNT,
+    MOP,
+    MRU,
+    MUR,
+    MVR,
+    MWK,
+    MXN,
+    MXV,
+    MYR,
+    MZN,
+    NAD,
+    NGN,
+    NIO,
+    NOK,
+    NPR,
+    NZD,
+    OMR,
+    PAB,
+    PEN,
+    PGK,
+    PHP,
+    PKR,
+    PLN,
+    PYG,
+    QAR,
+    RON,
+    RSD,
+    RUB,
+    RWF,
+    SAR,
+    SBD,
+    SCR,
+    SDG,
+    SEK,
+    SGD,
+    SHP,
+    SLL,
+    SOS,
+    SRD,
+    SSP,
+    STN,
+    SVC,
+    SYP,
+    SZL,
+    THB,
+    TJS,
+    TMT,
+    TND,
+    TOP,
+    TRY,
+    TTD,
+    TWD,
+    TZS,
+    UAH,
+    UGX,
+    USD,
+    USN,
+    UYI,
+    UYU,
+    UYW,
+    UZS,
+    VES,
+    VND,
+    VUV,
+    WST,
+    XAF,
+    XAG,
+    XAU,
+    XBA,
+    XBB,
+    XBC,
+    XBD,
+    XCD,
+    XDR,
+    XOF,
+    XPD,
+    XPF,
+    XPT,
+    XSU,
+    XTS,
+    XUA,
+    YER,
+    ZAR,
+    ZMW,
+    ZWL;
+
+    public static Currencies of(String code) {
+        if (code == null) {
+            return null;
+        }
+        return Currencies.valueOf(code.toUpperCase());
+    }
+
+}