8000 demonstrate how to use ISpecification · dddplus/dddplus-demo@6e8cd9a · GitHub
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demonstrate how to use ISpecification
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‎README.md‎

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@@ -52,6 +52,8 @@ curl -XPOST http://localhost:9090/reload?plugin=isv # plugin hot reloading
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- [前台对中台的步骤编排](order-center-bp-ka/src/main/java/org/example/bp/oms/ka/extension/DecideStepsExt.java)
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- [动态的步骤编排](order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/step/submitorder/BasicStep.java)
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- [扩展属性通过扩展点的实现](order-center-bp-isv/src/main/java/org/example/bp/oms/isv/extension/CustomModelExt.java)
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- [业务约束规则的显式化](order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/specification/ProductNotEmptySpec.java)
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- [如何使用](order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/ability/extension/DefaultAssignOrderNoExt.java)
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- [中台统一定义，兼顾前台个性化的错误码机制](order-center-cp/cp-oc-spec/src/main/java/org/example/cp/oms/spec/exception/OrderException.java)
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- [中台特色的领域模型](order-center-cp/cp-oc-spec/src/main/java/org/example/cp/oms/spec/model/IOrderMain.java)
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- spec jar里定义受限的领域模型输出给业务前台：通过接口，而不是类

‎order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/ability/extension/DefaultAssignOrderNoExt.java‎

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package org.example.cp.oms.domain.ability.extension;
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import io.github.dddplus.annotation.Extension;
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import lombok.extern.slf4j.Slf4j;
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import org.example.cp.oms.domain.specification.ProductNotEmptySpec;
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import org.example.cp.oms.spec.ext.IAssignOrderNoExt;
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import org.example.cp.oms.spec.model.IOrderMain;
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import javax.annotation.Resource;
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import javax.validation.constraints.NotNull;
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@Extension(code = IAssignOrderNoExt.DefaultCode, value = "defaultAssignOrderNoExt")
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@Slf4j
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public class DefaultAssignOrderNoExt implements IAssignOrderNoExt {
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@Resource
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private ProductNotEmptySpec productNotEmptySpec;
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@Override
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public void assignOrderNo(@NotNull IOrderMain model) {
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// 演示调用业务约束的使用：把implicit business rules变成explicit
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if (!productNotEmptySpec.isSatisfiedBy(model)) {
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log.warn("Spec:{} not satisfied", productNotEmptySpec);
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//throw new OrderException(OrderErrorReason.SubmitOrder.ProductEmpty);
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}
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}
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}

‎order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/specification/ProductNotEmptySpec.java‎

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package org.example.cp.oms.domain.specification;
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import io.github.dddplus.annotation.Specification;
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import io.github.dddplus.specification.ISpecification;
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import io.github.dddplus.specification.Notification;
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import org.example.cp.oms.spec.model.IOrderMain;
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// 之前的implicit business rules，现在变成了explicit rules
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@Specification("产品项不能空")
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public class ProductNotEmptySpec implements ISpecification<IOrderMain> {
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@Override
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public boolean isSatisfiedBy(IOrderMain candidate, Notification notification) {
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if (candidate.productDelegate().getProducts() == null || candidate.productDelegate().getProducts().isEmpty()) {
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return false;
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}
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return true;
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}
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}

‎order-center-cp/cp-oc-spec/src/main/java/org/example/cp/oms/spec/exception/OrderErrorReason.java‎

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enum SubmitOrder implements OrderErrorSpec {
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OrderConcurrentNotAllowed("101", "同一个订单不允许并发"),
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InvalidExtenalNo("102", "非法的外部单号"),
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ProductEmpty("103", "产品为空"),
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;
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private final String code;

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