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jprotobuf-rpc-http

jprotobuf-rpc-http 是应用jprotobuf类库实现基于http协议的RPC开发组件。
现可支持直接把Google protobuf的IDL定义语言发布成RPC服务,客户端也可以直接应用IDL定义语言进行动态创建,帮助开发完全省去了手工编译protobuf IDL语言的麻烦。

jprotobuf文档:https://github.com/jhunters/jprotobuf

环境要求

JDK 6 或以上版本 Spring 3.0+

API使用说明

RPC服务的发布

a1 在Spring配置文件,定义IDLServiceExporter服务发布配置 (直接由IDL定义发布)

	<bean class="com.baidu.jprotobuf.rpc.server.IDLServiceExporter">
		<property name="serviceName" value="SimpleIDLTest"></property>
		<property name="invoker" ref="simpleIDLInvoker"></property>
		<property name="inputIDL" value="classpath:/simplestring.proto"></property>
		<property name="outputIDL" value="classpath:/simplestring.proto"></property>	
	</bean>

	<bean id="simpleIDLInvoker" class="com.baidu.bjf.SimpleIDLInvoker"></bean>
inputIDL 属性表示接收的protobuf协议定义
outputIDL 属性表示返回的protobuf协议定义
serviceName 服务名称,必须填写。 在服务的servlet发布后,服务名称会以path路径方式查找
invoker 服务回调实现,必须实现 com.baidu.jprotobuf.rpc.server.ServerInvoker接口

a2 在Spring配置文件,定义AnnotationServiceExporter服务发布配置 (通过Jprotobuf注解类发布)

	<bean class="com.baidu.jprotobuf.rpc.server.AnnotationServiceExporter">
		<property name="serviceName" value="SimpleIDLTest2"></property>
		<property name="invoker" ref="simpleIDLInvoker"></property>
		<property name="inputClass" value="com.baidu.bjf.StringMessagePOJO"></property>
		<property name="outputClass" value="com.baidu.bjf.StringMessagePOJO"></property>	
	</bean>

	<bean id="simpleIDLInvoker" class="com.baidu.bjf.SimpleIDLInvoker"></bean>
inputClass 属性表示接收的JProtobuf注解POJO类
outputClass 属性表示返回的JProtobuf注解POJO类
serviceName 服务名称,必须填写。 在服务的servlet发布后,服务名称会以path路径方式查找
invoker 服务回调实现,必须实现 com.baidu.jprotobuf.rpc.server.ServerInvoker接口
public interface ServerInvoker {

    
    /**
     * RPC service call back method.
     * 
     * @param input request IDL proxy object by protobuf deserialized
     * @param output return back IDL proxy object to serialized
     * @throws Exception in case of any exception
     */
    void invoke(IDLProxyObject input, IDLProxyObject output) throws Exception;
}
public class SimpleIDLInvoker implements ServerInvoker {

    @Override
    public void invoke(IDLProxyObject input, IDLProxyObject output) throws Exception {
        if (input != null) {
            System.out.println(input.get("list"));
        }
        if (output != null) {
            output.put("list", "hello world");
        }
    }

}

simplestring.proto 文件定义:

package pkg;  

option java_package = "com.baidu.bjf.remoting.protobuf.simplestring";
  
option java_outer_classname = "StringTypeClass";  
  
message StringMessage {  
  required string list = 1;
}  

b web.xml文件配置服务发布servlet

	<servlet>
	    <servlet-name>protobufExporter</servlet-name>
	    <servlet-class>com.baidu.jprotobuf.rpc.server.HttpRequestHandlerServlet</servlet-class>
	</servlet>
	
	<servlet-mapping>
	    <servlet-name>protobufExporter</servlet-name>
	    <url-pattern>/remoting/*</url-pattern>
	</servlet-mapping>

RPC客户端的API开发

RPC客户端使用IDLProxyFactoryBean进行访问,示例代码如下:

    @Test
    public void testProxyFactoryBean() throws Exception {
        String idl = "package pkg; " +  
        "option java_package = \"com.baidu.bjf.remoting.protobuf.simplestring\";" +
        "option java_outer_classname = \"StringTypeClass\";" +
        "message StringMessage { required string list = 1;}  ";
        
        ByteArrayResource resource = new ByteArrayResource(idl.getBytes());
        
        IDLProxyFactoryBean proxyFactoryBean = new IDLProxyFactoryBean();
        proxyFactoryBean.setServiceUrl("http://localhost:8080/myfirstproject/remoting/SimpleIDLTest");
        proxyFactoryBean.setInputIDL(resource);
        proxyFactoryBean.setOutputIDL(resource);
        
        proxyFactoryBean.afterPropertiesSet();
        ClientInvoker invoker = proxyFactoryBean.getObject();
        
        //set request param
        IDLProxyObject input = invoker.getInput();
        
        input.put("list", "how are you!");
        IDLProxyObject output = invoker.invoke(input);
        
        System.out.println(output.get("list"));
       
    }

RPC客户端使用AnnotationProxyFactoryBean进行访问,示例代码如下:

    @Test
    public void testClientProxy() throws Exception {
        AnnotationProxyFactoryBean<StringMessagePOJO, StringMessagePOJO> factoryBean;
        
        factoryBean = new AnnotationProxyFactoryBean<StringMessagePOJO, StringMessagePOJO>();
        factoryBean.setServiceUrl("http://localhost:8080/myfirstproject/remoting/SimpleIDLTest");
        
        factoryBean.setInputClass(StringMessagePOJO.class);
        factoryBean.setOutputClass(StringMessagePOJO.class);
        
        factoryBean.afterPropertiesSet();
        
        ClientInvoker<StringMessagePOJO, StringMessagePOJO> invoker = factoryBean.getObject();
        
        StringMessagePOJO input = invoker.getInput();
        if (input != null) {
            input.setList("how are you!");
        }
        
        StringMessagePOJO output = invoker.invoke(input);
        if (output != null) {
            System.out.println(output.getList());
        }
    }

StringMessagePOJO对象代码:

public class StringMessagePOJO {

    @Protobuf(fieldType = FieldType.STRING, order = 1, required = true)
    private String list;

    /**
     * get the list
     * @return the list
     */
    public String getList() {
        return list;
    }

    /**
     * set list value to list
     * @param list the list to set
     */
    public void setList(String list) {
        this.list = list;
    }
    
    
}

RPC客户端Spring配置

RPC客户端使用IDLProxyFactoryBean进行访问

	<bean id="simpleTestClientForIDLProxy" class="com.baidu.jprotobuf.rpc.client.IDLProxyFactoryBean">
		<property name="inputIDL" value="classpath:/simplestring.proto"></property>
		<property name="outputIDL" value="classpath:/simplestring.proto"></property>
		<property name="inputIDLObjectName" value="StringMessage"></property>
		<property name="serviceUrl" value="http://localhost:8080/myfirstproject/remoting/SimpleIDLTest"></property>
	</bean>

RPC客户端使用AnnotationProxyFactoryBean进行访问

	<bean id="simpleTestClientForAnnotationProxy" class="com.baidu.jprotobuf.rpc.client.AnnotationProxyFactoryBean">
		<property name="inputClass" value="com.baidu.bjf.remoting.protobuf.FieldType.StringMessagePOJO"></property>
		<property name="outputClass" value="com.baidu.bjf.remoting.protobuf.FieldType.StringMessagePOJO"></property>
		<property name="serviceUrl" value="http://localhost:8080/myfirstproject/remoting/SimpleIDLTest"></property>
	</bean>	

多个IDL message定义解决方案

例如下面定义了多个message定义时,则在服务发布以及客户连接时,需要指定objectName

package pkg;  

option java_package = "com.baidu.bjf.remoting.protobuf.simplestring";
  
option java_outer_classname = "StringTypeClass";  
  
message StringMessage {  
  required string list = 1;
  optional StringMessage2 msg = 2;
}  

message StringMessage2 {  
  required string name = 1;
}  

下面示例只演示了客户端的配置,服务发布的配置也是相同

	<bean id="simpleTestClientForIDLProxy" class="com.baidu.jprotobuf.rpc.client.IDLProxyFactoryBean">
		<property name="inputIDL" value="classpath:/simplestring.proto"></property>
		<property name="outputIDL" value="classpath:/simplestring.proto"></property>
		<property name="inputIDLObjectName" value="StringMessage"></property>
		<property name="serviceUrl" value="http://localhost:8080/myfirstproject/remoting/SimpleIDLTest"></property>
	</bean>

应用JDK6 httpserver 直接发布RPC服务实现

JDK6之后已经内置了httpserver的服务功能,应用该功能可以直接发布RPC服务,而不需要再使用其它三方的web容器。

演示的代码如下:

    @Test
    public void testRPCRequest() {
        HttpRPCServer httpRPCServer = null;
        try {
            // 创建RPC Server  指定端口
            httpRPCServer = new HttpRPCServer(8080, 10);

            
            //新增RPC服务
            HttpServerRequestHandler httpHandler = new HttpServerRequestHandler(serviceExporter);
            httpRPCServer.addRPCHandler(httpHandler);
            
            //启动 RPC Server
            //启动,RPC服务url地址为: http://localhost:8080/{serviceExporter.getServiceName}
            httpRPCServer.start();
            
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (httpRPCServer != null) {
                httpRPCServer.stop(0);
            }
        }
    }

完整的测试代码详见源码中 HttpRPCServerTest.java

联系我们

email: rigel-opensource@baidu.com

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Protobuf RPC supports over HTTP by using JProtobuf

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