docs: Translate some of the README docs into Chinese (#1744)
* docs: translated docs to zh * docs: translated doc of sharding pattern to Chinese * docs: translated doc of factory pattern to Chinese * docs: translated doc of factory-kit pattern to Chinese Co-authored-by: Subhrodip Mohanta <hello@subho.xyz>
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---
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layout: pattern
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title: Composite Entity
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folder: composite-entity
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permalink: /patterns/composite-entity/
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categories: Structural
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tags:
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- Enterprise Integration Pattern
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---
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## 含义
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复合实体模式用于对一组相关联的持久化对象进行建模、描述和管理,用于取代对这组对象描述为单独粒度的实体。
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## 解释
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现实例子
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> 对于一个控制台对象,需要管理许多接口功能。通过使用复合实体模式,将消息对象、信号对象等依赖性对象组合在一起,直接使用单个对象对其进行控制。
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简单地说
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> 复合实体模式允许使用一个统一对象来管理一组相互关联的对象
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**编程示例**
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我们需要一个通用的解决方案来解决上述的控制台问题。我们引入了以下的通用复合对象。
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```java
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public abstract class DependentObject<T> {
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T data;
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public void setData(T message) {
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this.data = message;
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}
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public T getData() {
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return data;
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}
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}
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public abstract class CoarseGrainedObject<T> {
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DependentObject<T>[] dependentObjects;
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public void setData(T... data) {
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IntStream.range(0, data.length).forEach(i -> dependentObjects[i].setData(data[i]));
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}
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public T[] getData() {
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return (T[]) Arrays.stream(dependentObjects).map(DependentObject::getData).toArray();
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}
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}
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```
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专用的 `console` 复合实体继承自这个基类,如下所示。
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```java
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public class MessageDependentObject extends DependentObject<String> {
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}
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public class SignalDependentObject extends DependentObject<String> {
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}
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public class ConsoleCoarseGrainedObject extends CoarseGrainedObject<String> {
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@Override
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public String[] getData() {
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super.getData();
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return new String[]{
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dependentObjects[0].getData(), dependentObjects[1].getData()
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};
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}
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public void init() {
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dependentObjects = new DependentObject[]{
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new MessageDependentObject(), new SignalDependentObject()};
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}
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}
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public class CompositeEntity {
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private final ConsoleCoarseGrainedObject console = new ConsoleCoarseGrainedObject();
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public void setData(String message, String signal) {
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console.setData(message, signal);
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}
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public String[] getData() {
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return console.getData();
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}
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}
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```
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现在我们使用 `console` 复合实体来进行消息对象、信号对象的分配。
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```java
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var console = new CompositeEntity();
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console.init();
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console.setData("No Danger", "Green Light");
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Arrays.stream(console.getData()).forEach(LOGGER::info);
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console.setData("Danger", "Red Light");
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Arrays.stream(console.getData()).forEach(LOGGER::info);
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```
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## 类图
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## 适用场景
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复合实体模式适用于以下场景:
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* 你想要通过一个对象来管理多个依赖对象,已调整对象之间的细化程度。同时将依赖对象的生命周期托管到这个粗粒度的复合实体对象。
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## 引用
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* [Composite Entity Pattern in wikipedia](https://en.wikipedia.org/wiki/Composite_entity_pattern)
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