Dubbo、Spring、Zookeeper、集成基础案例(参数回调)

蔚落 2024-02-18 23:42 38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的参数回调。

**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、这里的pom.xml和Provider.java上一篇的一样就不贴上来了**

CallBackListener.java

package com.micai.dubbo.provider;
    
    /**
     * @Auther: zhaoxinguo
     * @Date: 2018/9/11 16:30
     * @Description: 参数回调监听器
     */
    public interface CallBackListener {
    
        /**
         * 调用服务提供方
         * @param msg
         */
        void changed(String msg);
    }

CallBackService.java

package com.micai.dubbo.provider;
    
    /**
     * @Auther: zhaoxinguo
     * @Date: 2018/9/11 16:29
     * @Description: 参数回调
     */
    public interface CallBackService {
    
        /**
         * 接口对消费者暴露的服务
         * @param key
         * @param callBackListener
         */
        void addListener(String key, CallBackListener callBackListener);
    }

CallBackServiceImpl.java

package com.micai.dubbo.provider;
    
    import java.text.SimpleDateFormat;
    import java.util.Date;
    import java.util.Map;
    import java.util.concurrent.ConcurrentHashMap;
    
    /**
     * @Auther: zhaoxinguo
     * @Date: 2018/9/11 16:31
     * @Description: 接口的实现类
     */
    public class CallBackServiceImpl implements CallBackService {
    
        // 监听器集合
        private final Map<String, CallBackListener> listeners = new ConcurrentHashMap<String, CallBackListener>();
    
        public CallBackServiceImpl() {
            Thread t = new Thread(new Runnable() {
                public void run() {
                    while (true) {
                        try {
                            for (Map.Entry<String, CallBackListener> entry : listeners.entrySet()) {
                                try {
                                    entry.getValue().changed(getChanged(entry.getKey()));
                                } catch (Throwable t) {
                                    listeners.remove(entry.getKey());
                                }
                            }
                            Thread.sleep(5000); // timely trigger change event
                        } catch (Throwable t) {
                            t.printStackTrace();
                        }
                    }
                }
            });
            t.setDaemon(true);
            t.start();
        }
    
        // 添加监听器、发送一个事件,触发监听器
        public void addListener(String key, CallBackListener listener) {
            listeners.put(key, listener);
            listener.changed(getChanged(key)); // send notification for change
        }
    
        private String getChanged(String key) {
            return "Changed: " + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
        }
    }

applicationContext.xml

**四：服务消费者、这里的pom.xml和上一篇的一样就不贴上来了**

CallBackAction.java

package com.micai.dubbo.consumer;
    
    import com.alibaba.dubbo.config.annotation.Reference;
    import com.micai.dubbo.provider.CallBackListener;
    import com.micai.dubbo.provider.CallBackService;
    import org.springframework.stereotype.Component;
    
    /**
     * @Auther: zhaoxinguo
     * @Date: 2018/9/11 17:46
     * @Description: 参数回调
     */
    @Component
    public class CallBackAction {
    
        @Reference
        private CallBackService callBackService;
    
        public void getChanges() {
            callBackService.addListener("zhaoxinguo", new CallBackListener() {
                @Override
                public void changed(String msg) {
                    System.out.println("callback: " + msg);
                }
            });
        }
    }

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();
    
            // 同步调用
            /*DemoAction demoAction = (DemoAction) classPathXmlApplicationContext.getBean("demoAction");
            String str = demoAction.sayHello();
            System.out.println("同步调用结果: " + str);*/
    
            // 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();*/
    
            // 参数回调
            CallBackAction callBackAction = classPathXmlApplicationContext.getBean("callBackAction", CallBackAction.class);
            callBackAction.getChanges();
    
            // -------------------- 全异步的Dubbo服务调用链 -------------------- //
    
            // CompletableFuture类型接口实现异步调用
            /*AsyncAction asyncAction = (AsyncAction) classPathXmlApplicationContext.getBean("asyncAction");
            asyncAction.asyncSayHello();*/
    
            // 同步接口使用Annotation Processor实现异步调用
            /*GreetingsAction greetingsAction = (GreetingsAction) classPathXmlApplicationContext.getBean("greetingsAction");
            greetingsAction.sayHi();*/
    
        }
    }

**五：运行结果**

**![70 1][]**

**六：下载源码请扫描加群获取**

![70 2][] QQ交流群

[70]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/80da98880c8141fbbf402643adce91d3.png
[70 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/c7c9edae0b404c1c932763c6b09d04dc.png
[70 2]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/8673dcffbc1c4a8e830e149dc4fdbfd6.png