前置内容
- 掌握策略模式
- 掌握责任链模式
- 掌握类继承、接口的实现
- 掌握参数的传递与设置
- GitHub地址
ps:【文章由来】公司项目中所用的合同签章处理流程,本人基于责任链上使用策略模式进行优化。
签章的处理流程
- 合同文本初始化
- 合同文本生成
- 签章挡板是否开启
- 合同签章发送mq
- 合同签章流水更新
- 合同上传文件服务器
- 签章渠道选择
- 签章渠道的实际调用
执行的流程如下:
整个结构类似于递归调用。每个节点中依赖上一个节点的输入以及下一个节点的输出,在中间过程可以实现每个节点的自定义操作,比较灵活。
流程实现
项目结构
DesignPatterns
└── src
└── main
└── java
└── com.xbhog.chainresponsibility
├── annotations
│ └── ContractSign
├── channel
│ ├── ContractSignChannelImpl.java
│ └── ContractSignChannel
├── Config
│ └── SignConfig
├── Enum
│ └── ContractSignEnum
├── impl
│ ├── ContractSignCompactInitImpl.java
│ ├── ContractSignGenerateImpl.java
│ ├── ContractSignMockImpl.java
│ ├── ContractSignMqImpl.java
│ ├── ContractSignSaveUploadImpl.java
│ ├── ContractSignSerialImpl.java
│ └── ContractSignTradeImpl.java
├── inter
│ ├── Call
│ ├── Chain
│ ├── Interceptor
│ └── Processor
├── pojo
│ ├── ContractRequest.java
│ └── ContractResponse.java
├── ContractCall
├── ContractChain
└── ContractSignProcessor.java
项目类图
责任链+组合模式代码实现
工程结构
DesignPatterns
└── src
└── main
└── java
└── com.xbhog.chainresponsibility
├── channel
│ ├── ContractSignChannelImpl.java
│ └── ContractSignChannel
├── impl
│ ├── ContractSignCompactInitImpl.java
│ ├── ContractSignGenerateImpl.java
│ ├── ContractSignMockImpl.java
│ ├── ContractSignMqImpl.java
│ ├── ContractSignSaveUploadImpl.java
│ ├── ContractSignSerialImpl.java
│ └── ContractSignTradeImpl.java
├── inter
│ ├── Call
│ ├── Chain
│ ├── Interceptor
│ └── Processor
├── pojo
│ ├── ContractRequest.java
│ └── ContractResponse.java
├── ContractCall
├── ContractChain
└── ContractSignProcessor.java
责任链中的对象定义
//请求
@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class ContractRequest {
private String name;
private String age;
private String status;
}
//响应
@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class ContractResponse {
private String status;
private String mas;
}
定义流程中的请求及响应类,方便处理每个责任链的请求、返回信息。
责任链处理流程
/**
* @author xbhog
* @describe: 责任链+组合实现合同签章
* @date 2023/7/11
*/
@Slf4j
@Component
public class ContractSignProcessor <T extends ContractRequest> implements Processor<T, ContractResponse> {
@Resource(name = "contractSignCompactInitImpl")
private Interceptor<T,ContractResponse> contractCompactInitImpl;
......
public ContractSignProcessor() {
}
@Override
public ContractResponse process(T paramter) {
//获取所有的监听器
List<Interceptor<T,ContractResponse>> interceptorList = new ArrayList<>();
interceptorList.add(contractCompactInitImpl);
......
//开始签章
log.info("签章开始");
return new ContractCall(paramter,interceptorList).exectue();
}
}
合同签章方法的主流程调用接口(入口),该类中注入所有的节点实现类(如contractCompactInitImpl
),通过编排实现责任链流程。
在初始化节点之前,进行节点的封装以及数据请求的处理。例:contractCompactInitImpl
-合同数据初始化节点
/**
* @author xbhog
* @describe: 合同数据请求、节点的实例化及方法执行
* @date 2023/7/11
*/
public class ContractCall<T extends ContractRequest> implements Call<T, ContractResponse> {
private final T originalRequest;
private final List<Interceptor<T,ContractRequest>> interceptorList;
public ContractCall(T originalRequest, List<Interceptor<T, ContractRequest>> interceptorList) {
this.originalRequest = originalRequest;
this.interceptorList = interceptorList;
}
@Override
public T request() {
return this.originalRequest;
}
@Override
public ContractResponse exectue() {
//实例化流程节点
ContractChain<T> chain = new ContractChain(0,this.originalRequest,this.interceptorList);
return chain.proceed(this.originalRequest);
}
}
获取节点中的请求参数,实例化当前责任链节点(contractCompactInitImpl
),在执行节点中的proceed
方法来获取当前节点的参数以及获取节点的信息。
/**
* @author xbhog
* @describe: 合同节点
* @date 2023/7/11
*/
@Slf4j
public class ContractChain<T extends ContractRequest> implements Chain<T, ContractResponse> {
private final Integer index;
private final T request;
private final List<Interceptor<T,ContractResponse>> interceptors;
public ContractChain(Integer index, T request, List<Interceptor<T, ContractResponse>> interceptors) {
this.index = index;
this.request = request;
this.interceptors = interceptors;
}
@Override
public T request() {
return this.request;
}
@Override
public ContractResponse proceed(T request) {
//控制节点流程
if(this.index >= this.interceptors.size()){
throw new IllegalArgumentException("index越界");
}
//下一个节点参数设置
Chain<T,ContractResponse> nextChain = new ContractChain(this.index + 1, request, this.interceptors);
//获取节点信息
Interceptor<T, ContractResponse> interceptor = this.interceptors.get(this.index);
Class<? extends Interceptor> aClass = interceptor.getClass();
log.info("当前节点:{}",aClass.getSimpleName());
ContractResponse response = interceptor.process(nextChain);
if(Objects.isNull(response)){
throw new NullPointerException("intercetor"+interceptor+"return null");
}
return response;
}
}
到此合同签章的架构流程已经确定,后续只要填充Interceptor
具体的实现类即可。
在代码中ContractResponse response = interceptor.process(nextChain);
来执行合同初始化节点的具体操作。
/**
* @author xbhog
* @describe: 合同文本初始化
* @date 2023/7/12
*/
@Slf4j
@Component
public class ContractSignCompactInitImpl<T extends ContractRequest> implements Interceptor<T, ContractResponse> {
public ContractSignCompactInitImpl() {
}
@Override
public ContractResponse process(Chain<T,ContractResponse> chain) {
log.info("=============执行合同文本初始化拦截器开始");
//获取处理的请求参数
T request = chain.request();
request.setStatus("1");
log.info("=============执行合同文本初始化拦截器结束");
//进入下一个责任链节点
ContractResponse response = chain.proceed(request);
if(Objects.isNull(response)){
log.error("返回值的为空");
response = ContractResponse.builder().status("fail").mas("处理失败").build();
}
//其他处理
return response;
}
}
测试验证
@SpringBootTest
class SPringBootTestApplicationTests {
@Autowired
@Qualifier("contractSignProcessor")
private Processor<ContractRequest,ContractResponse> contractSignProcessor;
@Test
void contextLoads() {
ContractRequest contractRequest = new ContractRequest();
contractRequest.setName("xbhog");
contractRequest.setAge("12");
ContractResponse process = contractSignProcessor.process(contractRequest);
System.out.println(process);
}
}
在这里只需要调用合同签章入口的方法即可进入合同签章的流程。
2023-07-16 13:25:13.063 INFO 26892 --- [ main] c.e.s.c.ContractSignProcessor : 签章开始
2023-07-16 13:25:13.067 INFO 26892 --- [ main] c.e.s.chainresponsibility.ContractChain : 当前节点:ContractSignCompactInitImpl
2023-07-16 13:25:13.068 INFO 26892 --- [ main] c.e.s.c.i.ContractSignCompactInitImpl : =============执行合同文本初始化拦截器开始
2023-07-16 13:25:13.069 INFO 26892 --- [ main] c.e.s.c.i.ContractSignCompactInitImpl : =============执行合同文本初始化拦截器结束
2023-07-16 13:25:13.069 INFO 26892 --- [ main] c.e.s.chainresponsibility.ContractChain : 当前节点:ContractSignGenerateImpl
2023-07-16 13:25:13.069 INFO 26892 --- [ main] c.e.s.c.impl.ContractSignGenerateImpl : =============执行合同文本生成拦截器开始
2023-07-16 13:25:13.069 INFO 26892 --- [ main] c.e.s.c.impl.ContractSignGenerateImpl : =============执行合同文本生成拦截器结束
2023-07-16 13:25:13.069 INFO 26892 --- [ main] c.e.s.chainresponsibility.ContractChain : 当前节点:ContractSignMockImpl
2023-07-16 13:25:13.069 INFO 26892 --- [ main] c.e.s.c.impl.ContractSignMockImpl : =============执行签章挡板拦截器开始
2023-07-16 13:25:13.069 INFO 26892 --- [ main] c.e.s.c.impl.ContractSignMockImpl : =============执行签章挡板拦截器结束
2023-07-16 13:25:13.069 INFO 26892 --- [ main] c.e.s.chainresponsibility.ContractChain : 当前节点:ContractSignMqImpl
2023-07-16 13:25:13.069 INFO 26892 --- [ main] c.e.s.c.impl.ContractSignMqImpl : =============执行合同签章完成发送mq拦截器开始
2023-07-16 13:25:13.069 INFO 26892 --- [ main] c.e.s.chainresponsibility.ContractChain : 当前节点:ContractSignSerialImpl
2023-07-16 13:25:13.069 INFO 26892 --- [ main] c.e.s.c.impl.ContractSignSerialImpl : =============执行合同签章流水处理拦截器开始
2023-07-16 13:25:13.069 INFO 26892 --- [ main] c.e.s.chainresponsibility.ContractChain : 当前节点:ContractSignSaveUploadImpl
2023-07-16 13:25:13.069 INFO 26892 --- [ main] c.e.s.c.impl.ContractSignSaveUploadImpl : =============执行合同签章完成上传服务器拦截器开始
2023-07-16 13:25:13.069 INFO 26892 --- [ main] c.e.s.chainresponsibility.ContractChain : 当前节点:ContractSignTradeImpl
2023-07-16 13:25:13.069 INFO 26892 --- [ main] c.e.s.c.impl.ContractSignTradeImpl : =============执行签章渠道实际调用拦截器开始
2023-07-16 13:25:13.069 INFO 26892 --- [ main] c.e.s.c.channel.ContractSignChannelImpl : 签章处理开始
2023-07-16 13:25:13.070 INFO 26892 --- [ main] c.e.s.c.impl.ContractSignSaveUploadImpl : 开始上传服务器
2023-07-16 13:25:13.070 INFO 26892 --- [ main] c.e.s.c.impl.ContractSignSaveUploadImpl : .............
2023-07-16 13:25:13.070 INFO 26892 --- [ main] c.e.s.c.impl.ContractSignSaveUploadImpl : 上传服务器完成
2023-07-16 13:25:13.070 INFO 26892 --- [ main] c.e.s.c.impl.ContractSignSaveUploadImpl : =============执行合同签章完成上传服务器拦截器结束
2023-07-16 13:25:13.070 INFO 26892 --- [ main] c.e.s.c.impl.ContractSignSerialImpl : =============执行合同签章流水处理拦截器结束
2023-07-16 13:25:13.070 INFO 26892 --- [ main] c.e.s.c.impl.ContractSignMqImpl : 发送MQ给下游处理数据
2023-07-16 13:25:13.070 INFO 26892 --- [ main] c.e.s.c.impl.ContractSignMqImpl : =============执行合同签章完成发送mq拦截器结束
ContractResponse(status=success, mas=处理成功)
策略+责任链+组合代码实现
以下是完整的合同签章入口实现类:
/**
* @author xbhog
* @describe: 责任链+组合实现合同签章
* @date 2023/7/11
*/
@Slf4j
@Component
public class ContractSignProcessor <T extends ContractRequest> implements Processor<T, ContractResponse> {
@Resource(name = "contractSignCompactInitImpl")
private Interceptor<T,ContractResponse> contractCompactInitImpl;
@Resource(name = "contractSignGenerateImpl")
private Interceptor<T,ContractResponse> contractGenerateImpl;
@Resource(name = "contractSignMockImpl")
private Interceptor<T,ContractResponse> contractSignMockImpl;
@Resource(name = "contractSignMqImpl")
private Interceptor<T,ContractResponse> contractSignMqImpl;
@Resource(name = "contractSignSaveUploadImpl")
private Interceptor<T,ContractResponse> contractSignSaveUploadImpl;
@Resource(name = "contractSignSerialImpl")
private Interceptor<T,ContractResponse> contractSignSerialImpl;
@Resource(name = "contractSignTradeImpl")
private Interceptor<T,ContractResponse> ContractSignTradeImpl;
public ContractSignProcessor() {
}
@Override
public ContractResponse process(T paramter) {
//获取所有的监听器
List<Interceptor<T,ContractResponse>> interceptorList = new ArrayList<>();
interceptorList.add(contractCompactInitImpl);
interceptorList.add(contractGenerateImpl);
interceptorList.add(contractSignMockImpl);
interceptorList.add(contractSignMqImpl);
interceptorList.add(contractSignSerialImpl);
interceptorList.add(contractSignSaveUploadImpl);
interceptorList.add(ContractSignTradeImpl);
//开始签章
log.info("签章开始");
return new ContractCall(paramter,interceptorList).exectue();
}
}
可以看到,目前的合同签章的处理流程需要的节点数已经7个了,后续如果新增节点或者减少节点都需要对该类进行手动的处理;比如:减少一个节点的流程。
- 删除节点实现的注入
- 删除
list
中的bean实现类
为方便后续的拓展(懒是社会进步的加速器,不是),在责任链,组合的基础上通过策略模式来修改bean的注入方式。
完整的项目结构和项目类图就是作者文章开始放的,可返回查看。
在第一部分的基础上增加的功能点如下
- 新增签章注解
- 新增签章节点枚举
- 新增签章配置类
签章注解实现
package com.example.springboottest.chainresponsibility.annotations;
import com.example.springboottest.chainresponsibility.Enum.ContractSignEnum;
import java.lang.annotation.*;
/**
* @author xbhog
* @describe:
* @date 2023/7/15
*/
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface ContractSign {
ContractSignEnum.SignChannel SIGN_CHANNEL();
}
设置注解修饰对象的范围,主要是对bean的一个注入,所以类型选择type
,
- TYPE: 用于描述类、接口(包括注解类型) 或enum声明
设置注解的运行周期(有效范围),一般是运行时有效,
- RUNTIME:在运行时有效(大部分注解的选择)
设置该注解的数据类型,
- ENUM:枚举类型,方便统一处理
枚举实现
package com.xbhog.chainresponsibility.Enum;
/**
* @author xbhog
* @describe:
* @date 2023/7/15
*/
public class ContractSignEnum {
public enum SignChannel {
SIGN_INIT(1, "合同文本初始化"),
SIGN_GENERATE(2, "合同文本生成"),
SIGN_MOCK(3, "签章挡板"),
SIGN_MQ(4, "合同签章完成发送MQ"),
SIGN_TABLE(5, "合同签章表处理"),
SIGN_UPLOAD(6, "合同签章完成上传服务器"),
SIGN_TRADE(7, "签章渠道实际调用");
private Integer code;
private String info;
SignChannel(Integer code, String info) {
this.code = code;
this.info = info;
}
......
}
}
对合同签章中的流程节点进行统一的配置。
签章配置类
在项目启动的时候,通过注解工具类AnnotationUtils
扫描所有被ContractSign注解
修饰的类,将这些类通过Map进行存储,方便后续的调用。
public class SignConfig {
@Resource
protected List<Interceptor> contractSignList;
protected static final Map<Integer,Interceptor> CONTRACT_SIGN_MAP = new ConcurrentHashMap<>();
@PostConstruct
public void init(){
contractSignList.forEach(interceptor -> {
//查找这个接口的实现类上有没有ContractSign注解
ContractSign sign = AnnotationUtils.findAnnotation(interceptor.getClass(), ContractSign.class);
if(!Objects.isNull(sign)){
CONTRACT_SIGN_MAP.put(sign.SIGN_CHANNEL().getCode(),interceptor);
}
});
}
}
到此,简化了Bean的注入方式。
签章注解使用
以合同文本初始化ContractSignCompactInitImpl
来说。
/**
* @author xbhog
* @describe: 合同文本初始化
* @date 2023/7/12
*/
@Slf4j
@ContractSign(SIGN_CHANNEL = ContractSignEnum.SignChannel.SIGN_INIT)
@Component
public class ContractSignCompactInitImpl<T extends ContractRequest> implements Interceptor<T, ContractResponse> {
public ContractSignCompactInitImpl() {
}
@Override
public ContractResponse process(Chain<T,ContractResponse> chain) {
log.info("=============执行合同文本初始化拦截器开始");
//获取处理的请求参数
T request = chain.request();
request.setStatus("1");
log.info("=============执行合同文本初始化拦截器结束");
//进入下一个责任链节点
ContractResponse response = chain.proceed(request);
if(Objects.isNull(response)){
log.error("返回值的为空");
response = ContractResponse.builder().status("fail").mas("处理失败").build();
}
//其他处理
return response;
}
}
在该实现类上绑定了枚举@ContractSign(SIGN_CHANNEL = ContractSignEnum.SignChannel.SIGN_INIT)
.
在合同签章入口类(**ContractSignProcessor**
)中的变更如下:
@Slf4j
@Component
public class ContractSignProcessor <T extends ContractRequest> extends SignConfig implements Processor<T, ContractResponse> {
public ContractSignProcessor() {
}
@Override
public ContractResponse process(T paramter) {
//获取所有的监听器
List<Interceptor<T,ContractResponse>> interceptorList = new ArrayList<>();
//获取排序后的结果,保证责任链的顺序,hashmap中key如果是数字的话,通过hashcode编码后是有序的
for(Integer key : CONTRACT_SIGN_MAP.keySet()){
interceptorList.add(CONTRACT_SIGN_MAP.get(key));
}
//开始签章
log.info("签章开始");
return new ContractCall(paramter,interceptorList).exectue();
}
}
通过继承合同签章配置类(SignConfig
),来获取Map
,遍历Map添加到list
后进入责任链流程。
到此,整个策略+责任链+组合的优化方式结束了。
问题:
责任链中的顺序是怎么保证的?
相信认真看完的你能在文章或者代码中找到答案。