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ApiTemplate 분리 - 환율정보 API의 기본 틀

생성일

2025/01/24 05:52

태그

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ApiTemplate

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환율정보 API로부터 환율을 가져오는 기능을 제공하는 오브젝트

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API 호출과 정보 추출의 기본 틀 제공

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두 가지 콜백을 이용

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유사한 여러 오브젝트에서 재사용 가능

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ApiTemplate

package tobyspring.hellospring.api;

import com.fasterxml.jackson.core.JsonProcessingException;

import java.io.IOException;
import java.math.BigDecimal;
import java.net.URI;
import java.net.URISyntaxException;

public class ApiTemplate {
    public static BigDecimal getExRate(String url, ApiExecutor apiExecutor, ExRateExtractor exRateExtractor) {
        URI uri;                 // URL -> URI 변경
        try {
            uri = new URI(url);
        } catch (URISyntaxException e) {
            throw new RuntimeException(e);
        }

        String response;
        try {
            response = apiExecutor.execute(uri);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        // build gradle에서 의존성 추가
        // 'com.fasterxml.jackson.core:jackson-databind:2.12.5'
        try {
            return exRateExtractor.extract(response);
        } catch (JsonProcessingException e) {
            throw new RuntimeException(e);
        }
    }
}
Java
복사

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HttpClientApiExecutor

package tobyspring.hellospring.api;

import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

public class HttpClientApiExecutor implements ApiExecutor {

    @Override
    public String execute(URI uri) throws IOException {
        HttpRequest request = HttpRequest.newBuilder()
                .uri(uri)
                .GET()
                .build();

        try {
            return HttpClient.newBuilder()
                    .build()
                    .send(request, HttpResponse.BodyHandlers.ofString()).body();
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }
    }
}
Java
복사

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WebApiExRateProvider

package tobyspring.hellospring.exrate;

import tobyspring.hellospring.api.*;
import tobyspring.hellospring.payment.ExRateProvider;

import java.math.BigDecimal;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;


public class WebApiExRateProvider implements ExRateProvider {
    ApiTemplate apiTemplate = new ApiTemplate();
    @Override
    public BigDecimal getExRate(String currency) {
        String url = "https://open.er-api.com/v6/latest/" + currency;

        return apiTemplate.getExRate(url, new HttpClientApiExecutor(), new ErApiExRateExtractor());           // 콜백
    }
}
Java
복사