Dubbo、Spring、Zookeeper、集成基础案例(异步调用 Dubbo 2.6.x版本之前的异步调用方式)

系统管理员 2024-02-18 23:41 65阅读 0赞

**摘要**：最近抽时间系统的学习了Dubbo的一些内容，趁有时间，整理下，顺便记录下，以防以后回顾。前面我们学校了Dubbo的xml、注解方式，本次我们学习下Dubbo的异步调用 Dubbo 2.6.x版本之前的异步调用方式。

**一：运行环境**

1>:JDK 1.8

2>:IDEA 2018.1

3>:Zookeeper 3.x

4>:Maven 3.2

5>:Dubbo 2.8.4

**二：项目结构**

**![70][]**

**三：服务提供者**

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <parent>
            <artifactId>micai-dubbo-chapter3</artifactId>
            <groupId>com.micai.dubbo</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
        <artifactId>micai-dubbo-provider</artifactId>
    
        <name>micai-dubbo-provider</name>
        
        <url>http://www.example.com</url>
    
        <properties>
            <spring.version>4.2.1.RELEASE</spring.version>
            <jdk.version>1.8</jdk.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>dubbo</artifactId>
                <version>2.8.4</version>
                <exclusions>
                    <exclusion>
                        <artifactId>spring</artifactId>
                        <groupId>org.springframework</groupId>
                    </exclusion>
                </exclusions>
            </dependency>
            <dependency>
                <groupId>com.101tec</groupId>
                <artifactId>zkclient</artifactId>
                <version>0.3</version>
            </dependency>
        </dependencies>
    
        <build>
            <pluginManagement>
                <plugins>
                    <plugin>
                        <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-compiler-plugin</artifactId>
                        <version>3.7.0</version>
                    </plugin>
                </plugins>
            </pluginManagement>
        </build>
    </project>

UserService.java

package com.micai.dubbo.provider;
    
    /**
     * @Auther: zhaoxinguo
     * @Date: 2018/9/11 16:18
     * @Description:
     */
    public interface UserService {
    
        String getNameById(String id);
    }

UserServiceImpl.java

package com.micai.dubbo.provider;
    
    import com.alibaba.dubbo.config.annotation.Service;
    
    /**
     * @Auther: zhaoxinguo
     * @Date: 2018/9/11 16:19
     * @Description:
     */
    @Service(version = "1.0.0", timeout = 10000)
    public class UserServiceImpl implements UserService {
    
        @Override
        public String getNameById(String id) {
            try {
                Thread.sleep(5000);//模拟业务执行
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            return "admin" + id;
        }
    }

Provider.java

package com.micai.dubbo;
    
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    import java.io.IOException;
    
    /**
     * @Auther: zhaoxinguo
     * @Date: 2018/9/10 14:13
     * @Description:
     */
    public class Provider {
    
        public static void main(String [] args) {
            ClassPathXmlApplicationContext classPathXmlApplicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
            classPathXmlApplicationContext.start();
            try {
                System.in.read();//按任意键退出
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

applicationContext.xml

**四：服务消费者**

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <parent>
            <artifactId>micai-dubbo-chapter3</artifactId>
            <groupId>com.micai.dubbo</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>micai-dubbo-consumer</artifactId>
    
        <name>micai-dubbo-consumer</name>
        
        <url>http://www.example.com</url>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <spring.version>4.2.1.RELEASE</spring.version>
            <jdk.version>1.8</jdk.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>dubbo</artifactId>
                <version>2.8.4</version>
                <exclusions>
                    <exclusion>
                        <artifactId>spring</artifactId>
                        <groupId>org.springframework</groupId>
                    </exclusion>
                </exclusions>
            </dependency>
            
            <dependency>
                <groupId>com.101tec</groupId>
                <artifactId>zkclient</artifactId>
                <version>0.3</version>
            </dependency>
            <dependency>
                <groupId>com.micai.dubbo</groupId>
                <artifactId>micai-dubbo-provider</artifactId>
                <version>1.0-SNAPSHOT</version>
            </dependency>
        </dependencies>
    
        <build>
            <pluginManagement>
                <plugins>
                    <plugin>
                        <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-compiler-plugin</artifactId>
                        <version>3.7.0</version>
                    </plugin>
                </plugins>
            </pluginManagement>
        </build>
    </project>

UserAction.java

package com.micai.dubbo.consumer;
    
    import com.alibaba.dubbo.config.annotation.Reference;
    import com.alibaba.dubbo.remoting.exchange.ResponseCallback;
    import com.alibaba.dubbo.remoting.exchange.ResponseFuture;
    import com.alibaba.dubbo.rpc.RpcContext;
    import com.alibaba.dubbo.rpc.protocol.dubbo.FutureAdapter;
    import com.micai.dubbo.provider.UserService;
    import org.springframework.stereotype.Component;
    
    import java.text.SimpleDateFormat;
    import java.util.Date;
    import java.util.concurrent.ExecutionException;
    import java.util.concurrent.Future;
    
    /**
     * @Auther: zhaoxinguo
     * @Date: 2018/9/11 16:23
     * @Description: 异步调用 2.6.x版本之前的异步方式
     */
    @Component
    public class UserAction {
    
        // 异步调用 不等待消息发出 即刻返回
        @Reference(version = "1.0.0", async = true, sent = false)
        private UserService userService;
    
        // 通过RpcContext获取Future
        public void getUserName() {
            // 此调用会立即返回null
            userService.getNameById("123123");
            System.out.println("异步业务调用结束 " + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
            // 拿到调用的Future引用，当结果返回后，会被通知和设置到此Future
            Future<Object> future = RpcContext.getContext().getFuture();
            try {
                String result = (String) future.get();
                System.out.println("异步回调返回结果 " + result + " " + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
                // TODO 业务操作，比如记录日志等
            } catch (InterruptedException e) {
                e.printStackTrace();
            } catch (ExecutionException e) {
                e.printStackTrace();
            }
        }
    
        // 拿到Dubbo内置的ResponseFuture并设置回调
        public void getUserName2() {
            // 此调用会立即返回null
            userService.getNameById("123123");
            System.out.println("异步业务调用结束 " + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
            // 拿到Dubbo内置的ResponseFuture并设置回调
            ResponseFuture responseFuture = ((FutureAdapter) RpcContext.getContext().getFuture()).getFuture();
            responseFuture.setCallback(new ResponseCallback() {
                @Override
                public void done(Object result) {
                    System.out.println("异步回调返回结果 " + result + " " + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
                }
                @Override
                public void caught(Throwable throwable) {
                    throwable.printStackTrace();
                }
            });
        }
    }

Consumer.java

package com.micai.dubbo;
    
    import com.micai.dubbo.consumer.CallBackAction;
    import com.micai.dubbo.consumer.DemoAction;
    import com.micai.dubbo.consumer.UserAction;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    /**
     * @Auther: zhaoxinguo
     * @Date: 2018/9/11 14:36
     * @Description:
     */
    public class Consumer {
    
        public static void main(String [] args) {
            ClassPathXmlApplicationContext classPathXmlApplicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
            classPathXmlApplicationContext.start();
    
            // 2.6.x版本之前的异步调用方式
            UserAction userAction = (UserAction) classPathXmlApplicationContext.getBean("userAction");
            // 通过RpcContext获取Future
            userAction.getUserName();
            // 拿到Dubbo内置的ResponseFuture并设置回调
            userAction.getUserName2();
    
        }
    }

applicationContext.xml

**五：运行结果**

**![70 1][]**

**六：下载源码请扫描下面的QQ交流群获取**

![70 2][] QQ交流群

[70]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/d54df72c655a466ba432d2b9e29c9b45.png
[70 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/61ce5285271b4cc492bd6011a11dbfc4.png
[70 2]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/1d39b21269334fd199b675fd5a438b84.png