java pipeline是什么，讓我們一起了解一下？

pipeline又稱為管道，是一種在計算機普遍使用的技術。在分布式處理領域，由于管道模式是數據驅動，而目前流行的Spark分布式處理平臺也是數據驅動的，兩者非常合拍，于是在spark的新的api里面pipeline模式得到了廣泛的應用。還有java web中的struct的filter、netty的pipeline，無處不見pipeline模式。

管道模式設計其實和責任鏈模式很像，都是按照順序往下執行不同的方法，管道只是負責順序執行，不管是否執行不同方法。

管道入口：

Map?context?=?new?HashMap<>();
????????????????context.put("BusinessType",?BusinessType.CREDIT_FLOW.getBusinessType());
????????????????context.put("CheckType",?CertificateBusinessTypeEnum.THREE_ELEMENTS.name());
????????????????context.put("ZaUser",?user);
????????????????context.put("RequestParam",?relavants);
????????????????//管道入口
????????????????context?=?certificateElementService.checkAdmittance(context);
????????????????JSONObject?jsonObject?=?(JSONObject)?context.get("ResponseParam");

AaaThreeElementsCheckValve?的實現：

@Component("aaaThreeElementsCheckValve")
public?class?AaaThreeElementsCheckValve?extends?AbstractLogableValve?{
?
????@Autowired
????private?ICodeLibraryService?codeLibraryService;
????@Autowired
????private?IJunYuCertificateService?junYuCertificateService;
?
????@Override
????public?void?handle(Map?context,?ValveChain?chain)?throws?I18NSupportException?{
????????String?checkType?=?context.get("CheckType").toString();
????????//aaa的校驗不通過,直接執行下一個
????????if?(!Objects.equals(CertificateBusinessTypeEnum.THREE_ELEMENTS.name(),?checkType))?{
????????????chain.handleNext(context);
????????}
????????//執行aaa的代碼邏輯
?????????if?(Objects.equals(CertificateResponseLevelEnum.FORBIDDEN.getCode(),?finalLevel))?{
????????????//aaa處理了請求,返回
????????????????return;
??????????}
????????????//放開,讓bbb去處理
????????????chain.handleNext(context);
????????}?catch?(Exception?e)?{
????????????logger.error("駿聿三要素接口異常：",?e);
????????????I18NSupportException.Builder?builder?=?new?I18NSupportException.Builder();
????????????builder.setTargetObject(this);
????????????builder.setMessage(e.getMessage());
????????????throw?builder.build();
????????}
????}
}

BbbThreeElementsCheckValve?的實現：

@Component("bbbThreeElementsCheckValve")
public?class?BbbThreeElementsCheckValve?extends?AbstractLogableValve?{
?
????@Autowired
????private?ICodeLibraryService?codeLibraryService;
????@Autowired
????private?IShuJuBaoCreditService?shuJuBaoCreditService;
?
????@Override
????public?void?handle(Map?context,?ValveChain?chain)?throws?I18NSupportException?{
?
????????JSONObject?jsonObject?=?(JSONObject)?context.get("ResponseParam");
????????if?(Objects.equals(Integer.valueOf(jsonObject.get(WebUtil.JSON_RESULT_STATUS_CODE).toString()),?WebUtil.ERROR))?{
????????????//aaa三要素接口已強控，因此不繼續調用bbb三要素接口,也不調用后續閥門進行校驗
????????}?else?{
????????????ZaUser?user?=?(ZaUser)?context.get("ZaUser");
????????????Object?requestParam?=?context.get("RequestParam");
????????????List?relavants?=?JSON.parseArray(JSON.toJSONString(requestParam),?CustomerCreditRelavant.class);
????????????CodeLibrary?codeLibrary?=?codeLibraryService.queryLibraryNoException("shujubaoCompanyIdAndCobankId",?user.getCompanyId()?+?"-"?+?relavants.get(0).getInquryBankId());
????????????if?(Objects.nonNull(codeLibrary))?{
????????????????String?s?=?shuJuBaoCreditService.sjbThreeElmentVerify(relavants);
????????????????if?(StringUtils.isNotBlank(s))?{
????????????????????jsonObject.put(WebUtil.JSON_RESULT_STATUS_CODE,?WebUtil.ERROR);
????????????????????jsonObject.put(WebUtil.JSON_RESULT_DATA,?JSONObject.toJSONString(s));
????????????????}
????????????}else{
????????????????//bbb三要素校驗通過，調用后續閥門進行校驗
????????????????chain.handleNext(context);
????????????}
????????}
????}
}

以上就是小編今天的分享了，希望可以幫助到大家。