1.新建项目
利用idea创建一个父项目,三个子项目,其中一个项目为生产者,一个项目为消费者,一个为接口等公共服务项目,生产者和消费者需要有web依赖,可以作为tomcat容器启动。
2.项目依赖
<dependencies> <dependency> <groupId>org.apache.dubbo</groupId> <artifactId>dubbo-spring-boot-starter</artifactId> <version>2.7.6</version> </dependency> <!-- zk的依赖 --> <dependency> <groupId>org.apache.dubbo</groupId> <artifactId>dubbo-dependencies-zookeeper</artifactId> <version>2.7.6</version> <type>pom</type> <exclusions> <exclusion> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-aop</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> </dependency>
3.在facade项目中新建接口
4.编写生产者
4.1 增加dubbo配置
server.port=8081 dubbo.registry.address=zookeeper://localhost:2181 dubbo.protocol.name=dubbo dubbo.protocol.port=20880 dubbo.registry.timeout=30000 dubbo.application.name=dubbo-provider-ll
4.2 编写生产者dubbo filter
public class ProviderFilter implements Filter { @Override public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException { Object threadName= invocation.getAttachment("ThreadName"); if(null!=threadName){ Thread thread = Thread.currentThread(); thread.setName(threadName.toString()); } return invoker.invoke(invocation); } }
注意:此处Filter 是dubbo的filter,不是servlet的filter
这里代码的目的是将从消费端传来的线程名称设置为线程名称
在resources目录下新建META-INF/dubbo/com.alibaba.dubbo.rpc.Filter 文件
即新增目录META-INF/dubbo和文件 com.alibaba.dubbo.rpc.Filter
在文件中增加,等号后面为实现dubbo filter的实现类路径
providerFilter=com.dubbo.spring.provider.filter.ProviderFilter
4.3编写dubbo生产者实现类
@Service(filter = {"providerFilter"}) public class DemoServiceImpl implements IDemoService { public Logger LOGGER= LoggerFactory.getLogger(DemoServiceImpl.class); @Override public String getName() { LOGGER.info("provider ThreadName : "+Thread.currentThread().getName()); return "dubbo-test"; } }
5.编写消费者
5.1编写消费者filter
public class DubboFilter implements Filter { @Override public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException { String name = Thread.currentThread().getName(); invocation.setAttachment("ThreadName",name); return invoker.invoke(invocation); } }
此处是将线程名称放入到attachment中,attachment底层是hashmap,后续使用dubbo请求生产者时,会把attachment给到生产者,故在生产中中可以通过key ThreadName来获取消费者端的线程名称
在resources目录下新建META-INF/dubbo/com.alibaba.dubbo.rpc.Filter 文件
即新增目录META-INF/dubbo和文件 com.alibaba.dubbo.rpc.Filter
在文件中增加,等号后面为实现dubbo filter的实现类路径
consumerFilter=com.dubbo.spring.consumer.filter.DubboFilter
5.2 编写response对象
public class Response implements Serializable { private static final long serialVersionUID = -3186818832535757509L; private String code; private String message; private Object result; private String index; public String getCode() { return code; } public void setCode(String code) { this.code = code; } public String getMessage() { return message; } public void setMessage(String message) { this.message = message; } public Object getResult() { return result; } public void setResult(Object result) { this.result = result; } public String getIndex() { return index; } public void setIndex(String index) { this.index = index; } }
此response为web端返回到页面统一对象
5.3 编写aop切面
@Aspect @Component public class AopContext { @Before("execution(* com.dubbo.spring..*.*(..))") public void before(){ Thread thread = Thread.currentThread(); thread.setName(UUIDUtil.getUUID()); } @Around("execution(* com.dubbo.spring..*.*(..))") public Object around(ProceedingJoinPoint pjp){ Response response=new Response(); try { Object proceed = pjp.proceed(); if(proceed instanceof Response){ response=(Response) proceed; response.setIndex(Thread.currentThread().getName()); } } catch (Throwable throwable) { throwable.printStackTrace(); } return response; } }
1.before是在请求进入时给线程设置名称,为随机生成的uuid
2.around是环绕通知,在执行完之后,在返回的结果中将线程名称设置进去,便于以后异常追踪
5.4 编写web
@RestController public class WebController { private Logger LOGGER= LoggerFactory.getLogger(WebController.class); @Reference(filter = {"consumerFilter"}) private IDemoService iDemoService; @GetMapping("/getName") public Response getName(){ LOGGER.info("consumer ThreadName : "+Thread.currentThread().getName()); String name = iDemoService.getName(); Response response=new Response(); response.setResult(name); response.setCode("1001"); response.setMessage("success"); return response; } }
请求结果
此处为postman响应的,index 为1ca55cb7a17148879923265b89102ccf
生产者线程名称:
消费者线程名称:
可以看到从web页面到生产者,消费者,都有一个全局唯一id进行贯穿,如果在web页面提示有异常时,可以通过这个uuid进行日志追踪
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