聊聊如何利用管道模式来进行业务编排（下篇）-原创手记-慕课网

前言

上篇文章我们介绍[利用管道模式来进行业务编排]的2种实现方式。本文又来介绍其他实现方式

实现方式

方式一：利用springboot自动装配

1、新建管道实体

@Data
@AllArgsConstructor
@NoArgsConstructor
public class PipelineDefinition {

    public static final String PREFIX = "lybgeek_pipeline_";

    private String comsumePipelineName;

    private List<String> pipelineClassNames;
}

@Data
@AllArgsConstructor
@NoArgsConstructor
@ConfigurationProperties(prefix = PipelineDefinitionProperties.PREFIX)
public class PipelineDefinitionProperties {

    public final static String PREFIX = "lybgeek.pipeline";

    private List<PipelineDefinition> chain;
}

2、编写自动装配类

@Configuration
@EnableConfigurationProperties(PipelineDefinitionProperties.class)
public class PipelineAutoConfiguration implements BeanFactoryAware,InitializingBean, SmartInitializingSingleton {


    @Autowired
    private PipelineDefinitionProperties pipelineDefinitionProperties;

    private DefaultListableBeanFactory defaultListableBeanFactory;


    @Override
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {

        defaultListableBeanFactory = (DefaultListableBeanFactory)beanFactory;

    }

    private void registerPipeline(DefaultListableBeanFactory defaultListableBeanFactory, PipelineDefinition pipelineDefinition) {
        LinkedBlockingDeque linkedBlockingDeque = buildPipelineQuque(pipelineDefinition);
        GenericBeanDefinition beanDefinition = (GenericBeanDefinition) BeanDefinitionBuilder.genericBeanDefinition(ChannelPipeline.class).getBeanDefinition();
        beanDefinition.getPropertyValues().addPropertyValue("channelHandlers",linkedBlockingDeque);
        defaultListableBeanFactory.registerBeanDefinition(PipelineDefinition.PREFIX + pipelineDefinition.getComsumePipelineName() ,beanDefinition);
    }

    @SneakyThrows
    private LinkedBlockingDeque buildPipelineQuque(PipelineDefinition pipelineDefinition) {
        List<String> pipelineClassNames = pipelineDefinition.getPipelineClassNames();
        if(CollectionUtil.isEmpty(pipelineClassNames)){
           throw new PipelineException("pipelineClassNames must config");
        }

        LinkedBlockingDeque linkedBlockingDeque = new LinkedBlockingDeque();
        for (String pipelineClassName : pipelineClassNames) {
            Class<?> pipelineClassClass = Class.forName(pipelineClassName);
            if(!AbstactChannelHandler.class.isAssignableFrom(pipelineClassClass)){
                throw new PipelineException("pipelineClassNames must be 【com.github.lybgeek.pipeline.handler.AbstactChannelHandler】 subclass");
            }
            Object pipeline = pipelineClassClass.getDeclaredConstructor().newInstance();
            linkedBlockingDeque.addLast(pipeline);
        }

        return linkedBlockingDeque;
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        if(CollectionUtil.isNotEmpty(pipelineDefinitionProperties.getChain())){
            for (PipelineDefinition pipelineDefinition : pipelineDefinitionProperties.getChain()) {
                registerPipeline(defaultListableBeanFactory, pipelineDefinition);
            }
        }
    }

    @Override
    public void afterSingletonsInstantiated() {
        Map<String, ChannelPipeline> pipelineBeanMap = defaultListableBeanFactory.getBeansOfType(ChannelPipeline.class);
        pipelineBeanMap.forEach((key,bean)->{
            bean.setHandlerContext(ChannelHandlerContext.getCurrentContext());
        });

    }
}

3、编写spring.factories

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.github.lybgeek.pipeline.spring.autoconfigure.PipelineAutoConfiguration\

业务项目如何使用该方式实现业务编排

示例：

1、创建管道执行器

@Slf4j
public class UserCheckChannelHandler extends AbstactChannelHandler {

    
    @Override
    public boolean handler(ChannelHandlerContext chx) {
        ChannelHandlerRequest channelHandlerRequest = chx.getChannelHandlerRequest();
        System.out.println("yml------------------------------------步骤一：用户数据校验【"+channelHandlerRequest.getRequestId()+"】");
        Object params = channelHandlerRequest.getParams();
        if(params instanceof User){
            User user = (User)params;
            if(StringUtils.isBlank(user.getFullname())){
                log.error("用户名不能为空");
                return false;
            }
            return true;
        }


        return false;
    }
}

@Slf4j
public class UserFillUsernameAndEmailChannelHandler extends AbstactChannelHandler {
    @SneakyThrows
    @Override
    public boolean handler(ChannelHandlerContext chx) {
        ChannelHandlerRequest channelHandlerRequest = chx.getChannelHandlerRequest();
        System.out.println("yml------------------------------------步骤二：用户名以及邮箱填充【将汉语转成拼音填充】【"+channelHandlerRequest.getRequestId()+"】");
        Object params = channelHandlerRequest.getParams();
        if(params instanceof User){
            User user = (User)params;
            String fullname = user.getFullname();
            HanyuPinyinOutputFormat hanyuPinyinOutputFormat = new HanyuPinyinOutputFormat();
            hanyuPinyinOutputFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
            String username = PinyinHelper.toHanYuPinyinString(fullname, hanyuPinyinOutputFormat);
            user.setUsername(username);
            user.setEmail(username + "@qq.com");
            return true;
        }


        return false;
    }
}

。。。其他执行器具体查看链接代码

2、配置yml文件

lybgeek:
  pipeline:
    chain:
      - comsumePipelineName: userYmlService
        pipelineClassNames:
          - com.github.lybgeek.pipeline.spring.test.yml.handler.UserCheckChannelHandler
          - com.github.lybgeek.pipeline.spring.test.yml.handler.UserFillUsernameAndEmailChannelHandler
          - com.github.lybgeek.pipeline.spring.test.yml.handler.UserPwdEncryptChannelHandler
          - com.github.lybgeek.pipeline.spring.test.yml.handler.UserMockSaveChannelHandler
          - com.github.lybgeek.pipeline.spring.test.yml.handler.UserPrintChannleHandler

3、具体业务service引入管道bean

@Service
public class UserYmlServiceImpl implements UserYmlService {


    @Autowired
    private ApplicationContext applicationContext;

    @Override
    public boolean save(User user) {

        ChannelPipeline pipeline =  applicationContext.getBean(ChannelPipeline.class,PipelineDefinition.PREFIX + StringUtils.uncapitalize(UserYmlService.class.getSimpleName()));

        return pipeline.start(ChannelHandlerRequest.builder().params(user).build());
    }
}

4、测试

    @Test
    public void testPipelineYml(){
        boolean isOk = userYmlService.save(user);
        Assert.assertTrue(isOk);

    }

方式二：利用spring自定义标签

1、定义xsd约束文件pipeline.xsd

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            xmlns:beans="http://www.springframework.org/schema/beans"
            xmlns:tool="http://www.springframework.org/schema/tool"
            xmlns="http://lybgeek.github.com/schema/pipeline"
            targetNamespace="http://lybgeek.github.com/schema/pipeline">

    <xsd:import namespace="http://www.w3.org/XML/1998/namespace"/>
    <xsd:import namespace="http://www.springframework.org/schema/beans"
                schemaLocation="http://www.springframework.org/schema/beans/spring-beans.xsd"/>
    <xsd:import namespace="http://www.springframework.org/schema/tool"/>

    <xsd:annotation>
        <xsd:documentation>
            <![CDATA[ Namespace support for pipeline services ]]></xsd:documentation>
    </xsd:annotation>


    <xsd:complexType name="pipelineType">
        <xsd:choice>
            <xsd:element ref="pipelineHandler" minOccurs="1" maxOccurs="unbounded"/>
        </xsd:choice>
        <xsd:attribute name="id" type="xsd:ID">
            <xsd:annotation>
                <xsd:documentation><![CDATA[ The unique identifier for a bean. ]]></xsd:documentation>
            </xsd:annotation>
        </xsd:attribute>
        <xsd:attribute name="consumePipelinesServiceClassName" type="xsd:string" use="required">
            <xsd:annotation>
                <xsd:documentation><![CDATA[ consumePipelinesService class name  ]]></xsd:documentation>
            </xsd:annotation>
        </xsd:attribute>
        <xsd:attribute name="consumePipelinesMethod" type="xsd:string" use="required">
            <xsd:annotation>
                <xsd:documentation><![CDATA[ consumePipelinesMethod name  ]]></xsd:documentation>
            </xsd:annotation>
        </xsd:attribute>
        <xsd:attribute name="argsType" type="xsd:string" use="required">
            <xsd:annotation>
                <xsd:documentation><![CDATA[ consumePipelinesMethod args type , multiple args types are separated by commas ]]></xsd:documentation>
            </xsd:annotation>
        </xsd:attribute>
    </xsd:complexType>

    <xsd:complexType name="pipelineHandlerType">
        <xsd:attribute name="className" type="xsd:string" use="required">
            <xsd:annotation>
                <xsd:documentation><![CDATA[ pipelineHanlder class name]]></xsd:documentation>
            </xsd:annotation>
        </xsd:attribute>
        <xsd:attribute name="order" type="xsd:string" use="required">
            <xsd:annotation>
                <xsd:documentation><![CDATA[ pipeline class name]]></xsd:documentation>
            </xsd:annotation>
        </xsd:attribute>
    </xsd:complexType>



    <xsd:element name="pipelineHandler" type="pipelineHandlerType">
        <xsd:annotation>
            <xsd:documentation><![CDATA[ The pipelineHandler config ]]></xsd:documentation>
        </xsd:annotation>
    </xsd:element>

    <xsd:element name="pipeline" type="pipelineType">
        <xsd:annotation>
            <xsd:documentation><![CDATA[ The pipeline config ]]></xsd:documentation>
        </xsd:annotation>
    </xsd:element>

</xsd:schema>

2、配置xsd约束文件

在classpath下的resources文件夹新建META-INF文件夹，再建立一个文件spring.schemas，内容如下

http\://lybgeek.github.com/schema/pipeline/pipeline.xsd=META-INF/pipeline.xsd

3、定义解析自定义标签的类

public class PipelineNamespaceHandler extends NamespaceHandlerSupport {

    @Override
    public void init() {
       registerBeanDefinitionParser("pipeline",new PipelineBeanDefinitionParser());
    }
}

public class PipelineBeanDefinitionParser implements BeanDefinitionParser {

    @Override
    public BeanDefinition parse(Element element, ParserContext parserContext) {
        PipelineConfig pipelineConfig = buildPipelineConfig(element);
        List<HandlerInvotation> handlerInvotations = this.buildHandlerInvotations(pipelineConfig);
        GenericBeanDefinition beanDefinition = getGenericBeanDefinition(element, parserContext, pipelineConfig, handlerInvotations);
        return beanDefinition;
    }

    private GenericBeanDefinition getGenericBeanDefinition(Element element, ParserContext parserContext, PipelineConfig pipelineConfig, List<HandlerInvotation> handlerInvotations) {
        GenericBeanDefinition beanDefinition = (GenericBeanDefinition) BeanDefinitionBuilder.genericBeanDefinition().getBeanDefinition();
        beanDefinition.getPropertyValues().addPropertyValue("pipelineServiceClz",pipelineConfig.getConsumePipelinesService());
        beanDefinition.getPropertyValues().addPropertyValue("handlerInvotations",handlerInvotations);
        beanDefinition.getPropertyValues().addPropertyValue("createByXml",true);
        beanDefinition.setBeanClass(ComsumePipelineFactoryBean.class);
        String beanName = BeanUtils.generateBeanName(element,"id",parserContext,pipelineConfig.getConsumePipelinesService().getSimpleName());
        parserContext.getRegistry().registerBeanDefinition(beanName,beanDefinition);
        return beanDefinition;
    }

    @SneakyThrows
    private List<HandlerInvotation> buildHandlerInvotations(PipelineConfig pipelineConfig){
        List<HandlerInvotation> handlerInvotations = new ArrayList<>();
        for (PipelineHandlerConfig pipelineHandlerConfig : pipelineConfig.getPipelineChain()) {
            if(!AbstactChannelHandler.class.isAssignableFrom(pipelineHandlerConfig.getPipelineClass())){
                throw new PipelineException("pipelineHandler className must be 【com.github.lybgeek.pipeline.handler.AbstactChannelHandler】 subclass");
            }

            AbstactChannelHandler channelHandler = (AbstactChannelHandler) pipelineHandlerConfig.getPipelineClass().getDeclaredConstructor().newInstance();
            HandlerInvotation invotation = HandlerInvotation.builder()
                    .args(pipelineConfig.getArgs())
                    .handler(channelHandler)
                    .order(pipelineHandlerConfig.getOrder())
                    .consumePipelinesMethod(pipelineConfig.getConsumePipelinesMethod())
                    .build();
            handlerInvotations.add(invotation);

        }
        return handlerInvotations;
    }

    @SneakyThrows
    private PipelineConfig buildPipelineConfig(Element element){
        String argsType = element.getAttribute("argsType");
        String[] argsTypeArr = trimArrayElements(commaDelimitedListToStringArray(argsType));
        String consumePipelinesMethod = element.getAttribute("consumePipelinesMethod");
        String consumePipelinesServiceClassName = element.getAttribute("consumePipelinesServiceClassName");


        Class[] args = null;
        if(ArrayUtil.isNotEmpty(argsTypeArr)){
            args = new Class[argsTypeArr.length];
            for (int i = 0; i < argsTypeArr.length; i++) {
                Class argType = Class.forName(argsTypeArr[i]);
                args[i] = argType;
            }
        }

        List<PipelineHandlerConfig> pipelineHandlerConfigs = buildPipelineHandlerConfig(element);

        return PipelineConfig.builder().args(args)
                .consumePipelinesMethod(consumePipelinesMethod)
                .consumePipelinesService(Class.forName(consumePipelinesServiceClassName))
                .pipelineChain(pipelineHandlerConfigs)
                .build();
    }

    @SneakyThrows
    private List<PipelineHandlerConfig> buildPipelineHandlerConfig(Element element){
        NodeList nodeList = element.getChildNodes();
        if (nodeList == null) {
            return Collections.emptyList();
        }

        List<PipelineHandlerConfig> pipelineHandlerConfigs = new ArrayList<>();
        for (int i = 0; i < nodeList.getLength(); i++) {
            if (!(nodeList.item(i) instanceof Element)) {
                continue;
            }
            Element childElement = (Element) nodeList.item(i);
            if ("pipelineHandler".equals(childElement.getNodeName()) || "pipelineHandler".equals(childElement.getLocalName())) {
                String pipelineHanlderClassName = childElement.getAttribute("className");
                String pipelineHanlderOrder = childElement.getAttribute("order");
                Class pipelineHanlderClass = Class.forName(pipelineHanlderClassName);
                PipelineHandlerConfig pipelineHandlerConfig = PipelineHandlerConfig.builder()
                        .PipelineClass(pipelineHanlderClass)
                        .order(Integer.valueOf(pipelineHanlderOrder))
                        .build();
                pipelineHandlerConfigs.add(pipelineHandlerConfig);
            }
        }

        return pipelineHandlerConfigs;
    }
}

4、注册解析类

在META-INF文件夹新建spring.handlers文件，内容如下

http\://lybgeek.github.com/schema/pipeline=com.github.lybgeek.pipeline.spring.shema.PipelineNamespaceHandler

业务项目如何使用该方式实现业务编排

示例：

1、创建管道执行器

@Slf4j
public class UserCheckChannelHandler extends AbstactChannelHandler {

    
    @Override
    public boolean handler(ChannelHandlerContext chx) {
        ChannelHandlerRequest channelHandlerRequest = chx.getChannelHandlerRequest();
        System.out.println("XML------------------------------------步骤一：用户数据校验【"+channelHandlerRequest.getRequestId()+"】");
        String json = JSON.toJSONString(channelHandlerRequest.getParams());
        List<User> users = JSON.parseArray(json,User.class);
        if(CollectionUtil.isEmpty(users) || StringUtils.isBlank(users.get(0).getFullname())){
            log.error("用户名不能为空");
            return false;
        }
        return true;


    }
}

@Slf4j
public class UserFillUsernameAndEmailChannelHandler extends AbstactChannelHandler {
    @SneakyThrows
    @Override
    public boolean handler(ChannelHandlerContext chx) {
        ChannelHandlerRequest channelHandlerRequest = chx.getChannelHandlerRequest();
        System.out.println("XML------------------------------------步骤二：用户名以及邮箱填充【将汉语转成拼音填充】【"+channelHandlerRequest.getRequestId()+"】");
        String json = JSON.toJSONString(channelHandlerRequest.getParams());
        List<User> users = JSON.parseArray(json,User.class);
        if(CollectionUtil.isNotEmpty(users)){
            User user = users.get(0);
            String fullname = user.getFullname();
            HanyuPinyinOutputFormat hanyuPinyinOutputFormat = new HanyuPinyinOutputFormat();
            hanyuPinyinOutputFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
            String username = PinyinHelper.toHanYuPinyinString(fullname, hanyuPinyinOutputFormat);
            user.setUsername(username);
            user.setEmail(username + "@qq.com");
            return true;

        }



        return false;
    }
}

。。。其他执行器具体查看链接代码

2、定义管道xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:lybgeek="http://lybgeek.github.com/schema/pipeline"
       xmlns="http://www.springframework.org/schema/beans"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
       http://lybgeek.github.com/schema/pipeline http://lybgeek.github.com/schema/pipeline/pipeline.xsd">

    
    <lybgeek:pipeline consumePipelinesServiceClassName="com.github.lybgeek.pipeline.spring.test.xml.service.UserXmlService" consumePipelinesMethod="save" argsType="com.github.lybgeek.pipeline.spring.test.model.User">
        <lybgeek:pipelineHandler className="com.github.lybgeek.pipeline.spring.test.xml.handler.UserCheckChannelHandler" order="1"/>
        <lybgeek:pipelineHandler className="com.github.lybgeek.pipeline.spring.test.xml.handler.UserFillUsernameAndEmailChannelHandler" order="2"/>
        <lybgeek:pipelineHandler className="com.github.lybgeek.pipeline.spring.test.xml.handler.UserPwdEncryptChannelHandler" order="3"/>
        <lybgeek:pipelineHandler className="com.github.lybgeek.pipeline.spring.test.xml.handler.UserMockSaveChannelHandler" order="4"/>
        <lybgeek:pipelineHandler className="com.github.lybgeek.pipeline.spring.test.xml.handler.UserPrintChannleHandler" order="5"/>
    </lybgeek:pipeline>

3、创建业务管道类

public interface UserXmlService {
    boolean save(User user);
}

直接定义接口即可

4、项目启动类上加上@ImportResource(“classpath:/pipeline.xml”)

@SpringBootApplication
@ImportResource("classpath:/pipeline.xml")
public class SpringPipelineApplication  {

    public static void main(String[] args) {
        SpringApplication.run(SpringPipelineApplication.class);
    }



}

5、测试

    @Test
    public void testPipelineXml(){
        boolean isOk = userXmlService.save(user);
        Assert.assertTrue(isOk);

    }

总结

本文的管道模式的核心逻辑内核和上篇文章是一样，只是把管道执行器通过配置文件集中管理起来，这个后续维护也比较不容易出错