手写RPC框架第一章《自定义配置xml》

public class ProviderConfig {

    private String nozzle; //接口
    private String ref;    //映射
    private String alias;  //别名

    //发布
    protected void doExport() {
        System.out.format("生产者信息=> [接口：%s] [映射：%s] [别名：%s] \r\n", nozzle, ref, alias);
    }

    public String getNozzle() {
        return nozzle;
    }

    public void setNozzle(String nozzle) {
        this.nozzle = nozzle;
    }

    public String getRef() {
        return ref;
    }

    public void setRef(String ref) {
        this.ref = ref;
    }

    public String getAlias() {
        return alias;
    }

    public void setAlias(String alias) {
        this.alias = alias;
    }
}

public class ProviderBean extends ProviderConfig implements ApplicationContextAware {

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        //发布生产者
        doExport();
    }

}

public class MyBeanDefinitionParser implements BeanDefinitionParser {

    private final Class<?> beanClass;

    MyBeanDefinitionParser(Class<?> beanClass) {
        this.beanClass = beanClass;
    }

    @Override
    public BeanDefinition parse(Element element, ParserContext parserContext) {

        RootBeanDefinition beanDefinition = new RootBeanDefinition();
        beanDefinition.setBeanClass(beanClass);
        beanDefinition.setLazyInit(false);
        String beanName = element.getAttribute("id");
        parserContext.getRegistry().registerBeanDefinition(beanName, beanDefinition);

        for (Method method : beanClass.getMethods()) {
            if (!isProperty(method, beanClass)) continue;
            String name = method.getName();
            String methodName = name.substring(3, 4).toLowerCase() + name.substring(4);
            String value = element.getAttribute(methodName);
            beanDefinition.getPropertyValues().addPropertyValue(methodName, value);
        }

        return beanDefinition;
    }

    private boolean isProperty(Method method, Class beanClass) {

        String methodName = method.getName();
        boolean flag = methodName.length() > 3 && methodName.startsWith("set") && Modifier.isPublic(method.getModifiers()) && method.getParameterTypes().length == 1;
        Method getter = null;
        if (!flag) return false;

        Class<?> type = method.getParameterTypes()[0];
        try {
            getter = beanClass.getMethod("get" + methodName.substring(3));
        } catch (NoSuchMethodException ignore) {

        }

        if (null == getter) {
            try {
                getter = beanClass.getMethod("is" + methodName.substring(3));
            } catch (NoSuchMethodException ignore) {

            }
        }

        flag = getter != null && Modifier.isPublic(getter.getModifiers()) && type.equals(getter.getReturnType());

        return flag;

    }

}

public class MyNamespaceHandler extends NamespaceHandlerSupport {

    @Override
    public void init() {
        registerBeanDefinitionParser("consumer", new MyBeanDefinitionParser(ConsumerBean.class));
        registerBeanDefinitionParser("provider", new MyBeanDefinitionParser(ProviderBean.class));
        registerBeanDefinitionParser("server", new MyBeanDefinitionParser(ServerBean.class));
    }

}

package org.itstack.demo.test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * http://www.itstack.org
 * create by fuzhengwei on 2019/5/4
 * 本章节主要介绍如何读取自定义配置xml文件字段信息
 */
public class ApiTest {

    public static void main(String[] args) {
        String[] configs = {"itstack-rpc-consumer.xml", "itstack-rpc-provider.xml"};
        new ClassPathXmlApplicationContext(configs);
    }

}

2019-05-07 19:44:24,805 main  INFO [org.springframework.context.support.ClassPathXmlApplicationContext:prepareRefresh:510] - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@299a06ac: startup date [Tue May 07 19:44:24 CST 2019]; root of context hierarchy
2019-05-07 19:44:24,872 main  INFO [org.springframework.beans.factory.xml.XmlBeanDefinitionReader:loadBeanDefinitions:315] - Loading XML bean definitions from class path resource [itstack-rpc-consumer.xml]
2019-05-07 19:44:24,972 main  INFO [org.springframework.beans.factory.xml.XmlBeanDefinitionReader:loadBeanDefinitions:315] - Loading XML bean definitions from class path resource [itstack-rpc-provider.xml]
2019-05-07 19:44:25,008 main  INFO [org.springframework.beans.factory.support.DefaultListableBeanFactory:preInstantiateSingletons:577] - Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@192b07fd: defining beans [consumer_itstack,consumer_helloService,provider_helloService]; root of factory hierarchy
服务端信息=> [注册中心地址：127.0.0.1] [注册中心端口：6379] 
生产者信息=> [接口：org.itstack.demo.test.service.HelloService] [映射：helloService] [别名：itStackRpc]