jsonrpc-4j代码解析（1）

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最新推荐文章于 2025-06-25 15:55:20 发布

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原文链接：https://my.oschina.net/guoenzhou/blog/1615646

本文介绍了AutoJsonRpcServiceImplExporter的工作原理，它是Spring框架中用于自动注册带有@JsonRpcService注解的服务类。通过扫描注解并创建JsonServiceExporter实例来完成服务注册。

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解析文件

AutoJsonRpcServiceImplExporter
JsonServiceExporter

AutoJsonRpcServiceImplExporter

路径：com.googlecode.jsonrpc4j.spring.AutoJsonRpcServiceImplExporter

AutoJsonRpcServiceImplExporter 是与spring 自动注册service启动类

实现 BeanFactoryPostProcessor 后置拦截器，具体了解可点击访问

postProcessBeanFactory() 是重载实现接口方法也是该类入口；

	public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
	    //扫描注解@JsonRpcService 的类
		DefaultListableBeanFactory defaultListableBeanFactory = (DefaultListableBeanFactory) beanFactory;
		Map<String, String> servicePathToBeanName = findServiceBeanDefinitions(defaultListableBeanFactory);
		//循环注册Service，
		for (Entry<String, String> entry : servicePathToBeanName.entrySet()) {
			registerServiceProxy(defaultListableBeanFactory, makeUrlPath(entry.getKey()), entry.getValue());
		}
	}

findServiceBeanDefinitions() 扫描注解@JsonRpcService 的类形成 key-value 结果集 key 是jsonrpc注解值，value 是 servicebeanName名称. serviceBeanNames.put(path, beanName);

//TODO

registerServiceProxy(defaultListableBeanFactory, makeUrlPath(entry.getKey()), entry.getValue())

entry.getKey() 是jsonrpc注解值 entry.getValue() 是 servicebeanName名称

BeanDefinitionBuilder builder = BeanDefinitionBuilder.rootBeanDefinition(JsonServiceExporter.class).addPropertyReference("service", serviceBeanName);

registerServiceProxy 方法内部做了一些属性注入

	if (objectMapper != null) {
			builder.addPropertyValue("objectMapper", objectMapper);
		}

		if (errorResolver != null) {
			builder.addPropertyValue("errorResolver", errorResolver);
		}

		if (invocationListener != null) {
			builder.addPropertyValue("invocationListener", invocationListener);
		}

		if (registerTraceInterceptor != null) {
			builder.addPropertyValue("registerTraceInterceptor", registerTraceInterceptor);
		}

		if (httpStatusCodeProvider != null) {
			builder.addPropertyValue("httpStatusCodeProvider", httpStatusCodeProvider);
		}

		if (convertedParameterTransformer != null) {
			builder.addPropertyValue("convertedParameterTransformer", convertedParameterTransformer);
		}

		if (contentType != null) {
		//设置response类型
			builder.addPropertyValue("contentType", contentType);
		}
		builder.addPropertyValue("backwardsCompatible", backwardsCompatible);
		builder.addPropertyValue("rethrowExceptions", rethrowExceptions);
		builder.addPropertyValue("allowExtraParams", allowExtraParams);
		builder.addPropertyValue("allowLessParams", allowLessParams);
		builder.addPropertyValue("shouldLogInvocationErrors", shouldLogInvocationErrors);

defaultListableBeanFactory 是IOC始祖，提定义Bean注册监听;

defaultListableBeanFactory.registerBeanDefinition(servicePath, builder.getBeanDefinition());

JsonServiceExporter 实现HtttpHandler,最终容器注册是这个Bean的实例.

class JsonServiceExporter extends AbstractJsonServiceExporter implements HttpRequestHandler {
    
    //jsonRpcServer 顶级实例
	private JsonRpcServer jsonRpcServer;

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected void exportService() {
		jsonRpcServer = getJsonRpcServer();
	}

	/**
	 * {@inheritDoc}
	 */
	public void handleRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	    //核心方法执行入口
		jsonRpcServer.handle(request, response);
		response.getOutputStream().flush();
	}

}

JsonRpcMultiServer

提供很多service 注册方式 Server
http://javadox.com/com.github.briandilley.jsonrpc4j/jsonrpc4j/1.1/com/googlecode/jsonrpc4j/JsonRpcMultiServer.html

/**
 * A multiple service dispatcher that supports JSON-RPC "method" names
 * that use dot-notation to select a server endpoint.  For example:
 * <pre>
 * {
 *    "jsonrpc": "2.0",
 *    "method": "service.method",
 *    "params": {"foo", "bar"},
 *    "id": 1
 * }
 * </pre>
 * An example of using this class is:
 * <code>
 *    JsonRpcMultiServer rpcServer = new JsonRpcMultiServer();
 *    rpcServer.addService("Foo", new FooService())
 *             .addService("Bar", new BarService());
 * </code>
 * A client can then call a <i>test(String, String)</i> method on the Foo service
 * like this:
 * <pre>
 * {
 *    "jsonrpc": "2.0",
 *    "method": "Foo.test",
 *    "params": ["some", "thing"],
 *    "id": 1
 * }
 * </pre>
 */

转载于:https://my.oschina.net/guoenzhou/blog/1615646