Dubbo Series VI, SPI extension filter implicit parameter

First, implement the filter interface 1, Consumer filter: Consumertracefilter.java

 PackageCom.dubbo.demo.Filter;ImportCom.alibaba.dubbo.rpc.*;ImportJava.util.Map;ImportJava.util.UUID; Public classConsumertracefilterImplementsFilter {@Override PublicResult Invoke (invoker<?> Invoker, invocation invocation)throwsrpcexception {Map<string, string> stringstringmap =invocation.getattachments (); //Setting ParametersStringstringmap.put ("Patentid", "0"); Stringstringmap.put ("Traceid", Uuid.randomuuid (). toString ()); System.out.println ("Generate TradeID:" +stringstringmap.get ("Traceid")); returnInvoker.invoke (invocation); }}

2, producer filter: Providertracefilter.java

 PackageCom.dubbo.demo.Filter;ImportCom.alibaba.dubbo.rpc.*;ImportJava.util.Map; Public classProvidertracefilterImplementsFilter { PublicResult Invoke (invoker<?> Invoker, invocation invocation)throwsrpcexception {Map<string, string> stringstringmap =invocation.getattachments (); //Receive ParametersSystem.out.println ("Received: Patentid:" +stringstringmap.get ("Patentid")); System.out.println ("Received: TradeID:" +stringstringmap.get ("Traceid")); returnInvoker.invoke (invocation); }}

Ii. Configuring the SPI Filter extension file 1, producer configuration

In directory: resources/meta-inf/dubbo/create com.alibaba.dubbo.rpc.Filter (plain text file,. txt)

Content:

Tracefilter=com.dubbo.demo.filter.providertracefilter

2. Consumer Configuration

In directory: resources/meta-inf/dubbo/create com.alibaba.dubbo.rpc.Filter (plain text file,. txt)

Content:

Tracefilter=com.dubbo.demo.filter.consumertracefilter

Iii. configuration Dubbo file 1, producer

<?XML version= "1.0" encoding= "UTF-8"?><Beansxmlns= "Http://www.springframework.org/schema/beans"Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"Xmlns:dubbo= "Http://code.alibabatech.com/schema/dubbo"xsi:schemalocation= "Http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd Http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd ">    <!--Filter Configuration -    < Dubbo:provider Filter = "Tracefilter" />
    <!--Dubbo Application Naming -    <dubbo:applicationname= "Dubbo-demo-provider"/>    <!--Dubbo Registered Address -    <Dubbo:registryAddress= "zookeeper://192.168.1.100:2181"/>    <!--Dubbo Protocol Address -    <Dubbo:protocolname= "Dubbo"Port= "20880"/>    <!--Interface Declaration -    <Dubbo:serviceInterface= "Com.dubbo.demo.api.DemoRpcService"ref= "Demorpcservice"/>        <BeanID= "Demorpcservice"class= "Com.dubbo.demo.DemoRpcServiceImpl"/>    </Beans>

2. Consumers

<?XML version= "1.0" encoding= "UTF-8"?><Beansxmlns= "Http://www.springframework.org/schema/beans"Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"Xmlns:dubbo= "Http://code.alibabatech.com/schema/dubbo"xsi:schemalocation= "Http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd Http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd ">    <!--Filter Configuration -    <Dubbo:consumerFilter= "Tracefilter" />    <!--Dubbo Application Naming -    <dubbo:applicationname= "Dubbo-demo-provider"/>    <!--Dubbo Registered Address -    <Dubbo:registryAddress= "zookeeper://192.168.1.100:2181"/>    <!--Interface Reference -    <dubbo:referenceInterface= "Com.dubbo.demo.api.DemoRpcService"ID= "Demorpcservice"/></Beans>

Iv. Verification

Start the producer, the consumer initiates the remote call

Example code:

Https://github.com/Star-Lordxing/dubbo-demo

Dubbo Series VI, SPI extension filter implicit parameter