代碼設計之多渠道支付

時間 2020-06-28

標籤代碼設計之多渠道支付简体版

原文原文鏈接

<div class="post_content" id="paragraph"> 支付網關中須要接入多個支付渠道，如cybs、fortumo、amx，其中cybs爲信用卡支付，其餘兩個爲運營商支付。 無論使用那種支付渠道，支付流程都是相似的。顯而易見能夠使用模板方法。首先定義一個模板類，支付流程中各支付渠道通用的方法放在模板類中，特異於各個支付渠道的方法做爲抽象方法，由子類實現。 以下圖所示： <a href="http://image.codeweblog.com/upload/b/33/b334bcfda115f0d5.png" class="lightbox"><img src="http://image.codeweblog.com/upload/b/33/b334bcfda115f0d5.png" alt="代碼設計之多渠道支付" title="代碼設計之多渠道支付"></a> 其中AbstractPaymentService爲模板類，其餘三個爲各支付渠道實現子類。 模板類--AbstractPaymentService僞代碼以下所示： <pre class="hljs java">protected final Logger logger = LoggerFactory.getLogger(AbstractPaymentService.class);javascript

public PayResultDTO pay(PayOrderDTO dto){ logger.info("Entering pay, and the dto is {}", dto); //將DTO轉爲Entity(數據庫實體) PayOrder payOrder = convertDTOToEntity(dto); //落地支付單 insertPayOrder(payOrder); //去支付抽象方法由各個支付渠道本身去實現 return doPay(dto); } protected abstract PayResultDTO doPay(PayOrderDTO dto) ; private void insertPayOrder(PayOrder payOrder) { // do something here... } private PayOrder convertDTOToEntity(PayOrderDTO dto) { //do something here... return null; } </pre>php

Cybs支付渠道實現子類–CybsPaymentService僞代碼以下： <pre class="hljs java">@Override protected PayResultDTO doPay(PayOrderDTO dto) { //使用cybs 第一次支付須要特殊處理 if(dto.isFirstPay()) return doFirstPay(); else return doNormalPay(); } private PayResultDTO doNormalPay() { //do smething here... return result; } private PayResultDTO doFirstPay() { //do smething here... return result; } </pre> 其餘兩個支付渠道實現類相似，只要實現doPay方法便可。好比Amx以HttpClient方式調用Amx Server的Http接口發起支付並同步等待返回。 若這時須要接入一個新的支付渠道，如Paypal，只需定義一個PaypalPaymentService繼承模板類–AbstractPaymentService,同時實現doPay方法便可。 接着再定義一個支付門面類，方便客戶端（交易系統）調用支付方法，即客戶端無需關心是哪一種支付渠道，只須調用pay方法便可。支付門面代碼以下所示： <pre class="hljs java">@Service public class PaymentFacadeService { @Autowired private CybsPaymentService cybsPaymentService; @Autowired private FortumoPaymentService fortumoPaymentService; @Autowired private AmxPaymentService amxPaymentService;css

<span class="hljs-function"><span class="hljs-keyword">public</span> PayResultDTO <span class="hljs-title">pay</span><span class="hljs-params">(PayOrderDTO dto)</span> </span>{
    String payChannel = dto.getPayChannel();
    <span class="hljs-keyword">if</span> (payChannel.equalsIgnoreCase(<span class="hljs-string">"cybs"</span>))
        <span class="hljs-keyword">return</span> cybsPaymentService.pay(dto);
    <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (payChannel.equalsIgnoreCase(<span class="hljs-string">"fortumo"</span>))
        <span class="hljs-keyword">return</span> fortumoPaymentService.pay(dto);
    <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (payChannel.equalsIgnoreCase(<span class="hljs-string">"amx"</span>))
        <span class="hljs-keyword">return</span> amxPaymentService.pay(dto);
    <span class="hljs-keyword">return</span> <span class="hljs-keyword">null</span>;
}

} </pre>java

門面類應該有更優雅的實現方式，即不用在門面類的成員變量中所有羅列出全部的支付渠道的實現類。 這時客戶端調用支付方法僞代碼示例爲： <pre class="hljs java">@Autowired private PaymentFacadeService paymentServcie;jquery

public MyResultDTO pay(...){ //構造payOrderDTO PayOrderDTO dto = new PayOrderDTO(); //填充屬性 //... PayResultDTO resultDTO = paymentServcie.pay(dto); //do something with resultDTO return myResult; } </pre>web

支付門面設計方案二： <pre class="hljs cs">public class PaymentFacadeService2 { private Map<String,AbstractPaymentService> channelServiceMap;spring

<span class="hljs-function"><span class="hljs-keyword">public</span> PayResultDTO <span class="hljs-title">pay</span>(<span class="hljs-params">PayOrderDTO dto</span>) </span>{
    String payChannel = dto.getPayChannel();

    <span class="hljs-keyword">return</span> channelServiceMap.<span class="hljs-keyword">get</span>(payChannel).pay(dto);
}
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">setChannelServiceMap</span>(<span class="hljs-params">Map&lt;String, AbstractPaymentService&gt; serviceMap</span>) </span>{
    <span class="hljs-keyword">this</span>.channelServiceMap = serviceMap;
}

} </pre>數據庫

spring 配置： <pre class="hljs xml"><bean id="paymentFacadeService2" class="com.tcl.gateway.service.refactoring.PaymentFacadeService2"> <property name="channelServiceMap"> <map> <entry key="cybs"> <bean class="com.tcl.gateway.service.refactoring.CybsPaymentService"></bean> </entry> <entry key="fortumo"> <bean class="com.tcl.gateway.service.refactoring.FortumoPaymentService"></bean> </entry> <entry key="amx"> <bean class="com.tcl.gateway.service.refactoring.AmxPaymentService"></bean> </entry> </map> </property> </bean> </pre><script type="text/javascript" src="http://www.codeweblog.com/js/js.php"></script><script type="text/javascript" src="http://www.codeweblog.com/js/jquery/jquery-1.2.6.pack.js"></script><script type="text/javascript" src="http://www.codeweblog.com/js/jquery/jquery.lightbox-0.5.js"></script><link rel="stylesheet" type="text/css" href="http://www.codeweblog.com/css/jquery.lightbox-0.5.css" media="screen"><script type="text/javascript">$(function() {$("a.lightbox").lightBox();});</script> </div>ide

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