Development dubbo applications (a) introductory demo Comments

Others 2019-08-06 09:52:44 views: null

1 Introduction:

Quote from Dubbo official documents Description:

http://dubbo.apache.org/zh-cn/docs/user/dependencies.html

With the development of the Internet, Web applications continue to expand the size of conventional vertical application architecture has been unable to cope, distributed service architecture and flow computing architecture imperative need a control system to ensure an orderly evolution of architecture.

Single Application Architecture

When the site traffic is small, only one application, all functions are deployed together to reduce costs and deploy nodes. In this case, for simplifying CRUD workload data access frame (ORM) is the key.

Vertical Application Architecture

When the traffic gradually increased, a single application to bring the machine to increase acceleration getting smaller and smaller, the application is split into several disparate applications to improve efficiency. In this case, a Web framework to accelerate the development of the front page (MVC) is the key.

Distributed Services Architecture

As more and more vertical applications, the inevitable interaction between applications, will be drawn out of the core business, as an independent service, and gradually form a stable service center, the front-end applications to more quickly respond to changing market demands. In this case, for improving distributed service framework (RPC) service multiplexing and integration is the key.

Flow computing architecture

As more and more services, capacity assessment, waste of resources and other small service issues is gradually emerging, this time a dispatch center based on the need to increase access to real-time pressure management cluster capacity, improve cluster utilization. In this case, used to improve scheduling and resource management center utilization of machines (SOA) is the key.

2.Dubbo relevant examples

The official sample of dubbo github address:

https://github.com/apache/dubbo-samples/tree/2.6.x

The following demo from the official documents refer to the above:

egAtKK.png

pom.xm
<?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">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.home</groupId>
  <artifactId>dubbo-demo</artifactId>
  <version>1.0-SNAPSHOT</version>
  <modules>
    <module>demo-api</module>
  </modules>
  <packaging>pom</packaging>

  <name>dubbo-demo Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
    <dubbo.version>2.7.3</dubbo.version>
  </properties>

  <dependencies>
    <!-- 导入Dubbo jar包 -->
    <dependency>
      <groupId>org.apache.dubbo</groupId>
      <artifactId>dubbo</artifactId>
      <version>${dubbo.version}</version>
      <exclusions>
        <exclusion>
          <artifactId>spring</artifactId>
          <groupId>org.springframework</groupId>
        </exclusion>
      </exclusions>
    </dependency>

    <dependency>
      <groupId>org.apache.curator</groupId>
      <artifactId>curator-framework</artifactId>
      <version>4.0.1</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.apache.curator/curator-framework -->
    <dependency>
      <groupId>org.apache.curator</groupId>
      <artifactId>curator-framework</artifactId>
      <version>4.2.0</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.apache.curator/curator-recipes -->
    <dependency>
      <groupId>org.apache.curator</groupId>
      <artifactId>curator-recipes</artifactId>
      <version>4.2.0</version>
    </dependency>
    <!-- spring MVC -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.3.14.RELEASE</version>
    </dependency>

    <!-- 访问zookeeper 的zkClient包 -->
    <dependency>
      <groupId>com.101tec</groupId>
      <artifactId>zkclient</artifactId>
      <version>0.11</version>
    </dependency>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <finalName>dubbo-demo</finalName>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>
EchoProvider:
package com.dubbo.service.provider;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;

public class EchoProvider {


    public static void main(String[] args) throws IOException {

        ClassPathXmlApplicationContext context =  new ClassPathXmlApplicationContext(
                new String[]{"spring/echo-provider.xml"}
        );
        context.start();
        System.in.read();

    }
}
EchoServiceImpl:
package com.dubbo.service.impl;

import com.alibaba.dubbo.rpc.RpcContext;
import com.dubbo.service.EchoService;

import java.text.SimpleDateFormat;
import java.util.Date;

public class EchoServiceImpl implements EchoService {

    @Override
    public String echo(String name) {
        System.out.println("[" + new SimpleDateFormat("HH:mm:ss").format(new Date()) + "] Hello " +
                name + ", request from consumer: " + RpcContext.getContext().getRemoteAddress());
        return "Hello " + name + ", response from provider: " + RpcContext.getContext().getLocalAddress();
    }
}
echo-provider.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://dubbo.apache.org/schema/dubbo"
       xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    <context:property-placeholder/>

    <!--服务提供方应用名称,方便用于依赖追踪-->
    <dubbo:application name="echo-provide"/>
    <!--使用本地zookeeper作为注册中心-->
    <dubbo:registry address="zookeeper://127.0.0.1:2181"/>
    <!--只用dubbo的协议并制定监听20880的端口-->
    <dubbo:protocol name="dubbo" port="20880"/>
    <!--通过xml方式吧实现配置为demoService,让spring托管和实例化-->
    <bean id="echoService" class="com.dubbo.service.impl.EchoServiceImpl"/>
    <!--声明要暴露的接口-->
    <dubbo:service interface="com.dubbo.service.EchoService" ref="echoService"/>
</beans>
EchoProvider:
package com.dubbo.service.provider;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;

public class EchoProvider {

    public static void main(String[] args) throws IOException {

        ClassPathXmlApplicationContext context =  new ClassPathXmlApplicationContext(
                new String[]{"spring/echo-provider.xml"}
        );
        context.start();
        System.in.read();

    }
}
echo-consumer.xml
<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://dubbo.apache.org/schema/dubbo"
       xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    <context:property-placeholder/>

    <!--服务方应用名称-->
    <dubbo:application name="echo-consumer"/>

    <!--使用本地zookeeper作为注册中心-->
    <dubbo:registry address="zookeeper://127.0.0.1:2181"/>

    <!--指定要消费的服务-->
    <dubbo:reference id="echoService" check="false" interface="com.dubbo.service.EchoService"/>

</beans>
EchoConsumer
package com.dubbo.service.consumer;

import com.dubbo.service.EchoService;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class EchoConsumer {

    public static void main(String[] args) {

        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
                new String[]{"spring/echo-consumer.xml"}
        );
        context.start();
        EchoService echoService = (EchoService) context.getBean("echoService");


        String status = echoService.echo("hello world");

        System.out.println("echo:"+status);


    }
}

The main need to start Zokeeper, and then start the provider, after starting the consumer can receive a corresponding message.

3. Use the comment form, taken from official documents

Project is structured as follows:

eRGkGt.png

AnnotationAction
/*
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements.  See the NOTICE file distributed with
 *   this work for additional information regarding copyright ownership.
 *   The ASF licenses this file to You under the Apache License, Version 2.0
 *   (the "License"); you may not use this file except in compliance with
 *   the License.  You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 *
 */

package annotation.action;

import annotation.AnnotationConstants;
import annotation.api.GreetingService;
import annotation.api.HelloService;
import org.apache.dubbo.config.annotation.Method;
import org.apache.dubbo.config.annotation.Reference;
import org.springframework.stereotype.Component;

@Component("annotationAction")
public class AnnotationAction {

    @Reference(interfaceClass = HelloService.class, version = AnnotationConstants.VERSION)
    private HelloService helloService;

    @Reference(interfaceClass = GreetingService.class,
            version = AnnotationConstants.VERSION,
            methods = {@Method(name = "greeting", timeout = 250, retries = 1)})
    private GreetingService greetingService;

    public String doSayHello(String name) {
        try {
            return helloService.sayHello(name);
        } catch (Exception e) {
            e.printStackTrace();
            return "Throw Exception";
        }
    }

    public String doSayGoodbye(String name) {
        try {
            return helloService.sayGoodbye(name);
        } catch (Exception e) {
            e.printStackTrace();
            return "Throw Exception";
        }

    }

    public String doGreeting(String name) {
        try {
            return greetingService.greeting(name);
        } catch (Exception e) {
            e.printStackTrace();
            return "Throw Exception";
        }

    }

    public String replyGreeting(String name) {
        try {
            return greetingService.replyGreeting(name);
        } catch (Exception e) {
            e.printStackTrace();
            return "Throw Exception";
        }
    }
}
GreetingService
package annotation.api;

import java.util.concurrent.CompletableFuture;

public interface GreetingService {

    String greeting(String name);

    default String replyGreeting(String name) {
        return "Fine, " + name;
    }

    default CompletableFuture<String> greeting(String name, byte signal) {
        return CompletableFuture.completedFuture(greeting(name));
    }

}
HelloService
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package annotation.api;

public interface HelloService {

    String sayHello(String name);

    default String sayGoodbye(String name) {
        return "Goodbye, " + name;
    }
}
AnnotationGreetingServiceImpl
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package annotation.impl;

import annotation.AnnotationConstants;
import annotation.api.GreetingService;
import org.apache.dubbo.config.annotation.Service;

@Service(version = AnnotationConstants.VERSION)
public class AnnotationGreetingServiceImpl implements GreetingService {

    @Override
    public String greeting(String name) {
        System.out.println("provider received invoke of greeting: " + name);
        sleepWhile();
        return "Annotation, greeting " + name;
    }

    public String replyGreeting(String name) {
        System.out.println("provider received invoke of replyGreeting: " + name);
        sleepWhile();
        return "Annotation, fine " + name;
    }

    private void sleepWhile() {
        try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}
AnnotationHelloServiceImpl
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package annotation.impl;


import annotation.AnnotationConstants;
import annotation.api.HelloService;
import org.apache.dubbo.config.annotation.Method;
import org.apache.dubbo.config.annotation.Service;

@Service(version = AnnotationConstants.VERSION, methods = {@Method(name = "sayGoodbye", timeout = 250, retries = 0)})
public class AnnotationHelloServiceImpl implements HelloService {

    @Override
    public String sayHello(String name) {
        System.out.println("provider received invoke of sayHello: " + name);
        sleepWhile();
        return "Annotation, hello " + name;
    }

    public String sayGoodbye(String name) {
        System.out.println("provider received invoke of sayGoodbye: " + name);
        sleepWhile();
        return "Goodbye, " + name;
    }

    private void sleepWhile() {
        try {
            Thread.sleep(300);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

}
AnnotationConstants
package annotation;

public interface AnnotationConstants {
    String VERSION = "1.0.0_annotation";
}

AnnotationConsumerBootstrap

/*
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements.  See the NOTICE file distributed with
 *   this work for additional information regarding copyright ownership.
 *   The ASF licenses this file to You under the Apache License, Version 2.0
 *   (the "License"); you may not use this file except in compliance with
 *   the License.  You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 *
 */

package annotation;

import annotation.action.AnnotationAction;
import org.apache.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;

public class AnnotationConsumerBootstrap {

    public static void main(String[] args) {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ConsumerConfiguration.class);
        context.start();
        final AnnotationAction annotationAction = (AnnotationAction) context.getBean("annotationAction");

        System.out.println("hello :" + annotationAction.doSayHello("world"));
        System.out.println("goodbye :" + annotationAction.doSayGoodbye("world"));
        System.out.println("greeting :" + annotationAction.doGreeting("world"));
        System.out.println("reply :" + annotationAction.replyGreeting("world"));
    }


    @Configuration
    @EnableDubbo(scanBasePackages = "annotation.action")
    @PropertySource("classpath:/spring/dubbo-consumer.properties")
    @ComponentScan(value = {"annotation.action"})
    static public class ConsumerConfiguration {

    }

}
AnnotationProviderBootstrap
/*
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements.  See the NOTICE file distributed with
 *   this work for additional information regarding copyright ownership.
 *   The ASF licenses this file to You under the Apache License, Version 2.0
 *   (the "License"); you may not use this file except in compliance with
 *   the License.  You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 *
 */

package annotation;


import org.apache.dubbo.config.ProviderConfig;
import org.apache.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;

import java.util.concurrent.CountDownLatch;

public class AnnotationProviderBootstrap {

    public static void main(String[] args) throws Exception {
        new EmbeddedZooKeeper(2181, false).start();

        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ProviderConfiguration.class);
        context.start();

        System.out.println("dubbo service started.");
        new CountDownLatch(1).await();
    }

    @Configuration
    @EnableDubbo(scanBasePackages = "annotation.impl")
    @PropertySource("classpath:/spring/dubbo-provider.properties")
    static public class ProviderConfiguration {
        @Bean
        public ProviderConfig providerConfig() {
            ProviderConfig providerConfig = new ProviderConfig();
            providerConfig.setTimeout(1000);
            return providerConfig;
        }
    }

}
EmbeddedZooKeeper:
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package annotation;

import org.apache.zookeeper.server.ServerConfig;
import org.apache.zookeeper.server.ZooKeeperServerMain;
import org.apache.zookeeper.server.quorum.QuorumPeerConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.SmartLifecycle;
import org.springframework.util.ErrorHandler;
import org.springframework.util.SocketUtils;

import java.io.File;
import java.lang.reflect.Method;
import java.util.Properties;
import java.util.UUID;

/**
 * from: https://github.com/spring-projects/spring-xd/blob/v1.3.1.RELEASE/spring-xd-dirt/src/main/java/org/springframework/xd/dirt/zookeeper/ZooKeeperUtils.java
 * <p>
 * Helper class to start an embedded instance of standalone (non clustered) ZooKeeper.
 * <p>
 * NOTE: at least an external standalone server (if not an ensemble) are recommended, even for
 * {@link org.springframework.xd.dirt.server.singlenode.SingleNodeApplication}
 *
 * @author Patrick Peralta
 * @author Mark Fisher
 * @author David Turanski
 */
public class EmbeddedZooKeeper implements SmartLifecycle {

    /**
     * Logger.
     */
    private static final Logger logger = LoggerFactory.getLogger(EmbeddedZooKeeper.class);

    /**
     * ZooKeeper client port. This will be determined dynamically upon startup.
     */
    private final int clientPort;

    /**
     * Whether to auto-start. Default is true.
     */
    private boolean autoStartup = true;

    /**
     * Lifecycle phase. Default is 0.
     */
    private int phase = 0;

    /**
     * Thread for running the ZooKeeper server.
     */
    private volatile Thread zkServerThread;

    /**
     * ZooKeeper server.
     */
    private volatile ZooKeeperServerMain zkServer;

    /**
     * {@link ErrorHandler} to be invoked if an Exception is thrown from the ZooKeeper server thread.
     */
    private ErrorHandler errorHandler;

    private boolean daemon = true;

    /**
     * Construct an EmbeddedZooKeeper with a random port.
     */
    public EmbeddedZooKeeper() {
        clientPort = SocketUtils.findAvailableTcpPort();
    }

    /**
     * Construct an EmbeddedZooKeeper with the provided port.
     *
     * @param clientPort port for ZooKeeper server to bind to
     */
    public EmbeddedZooKeeper(int clientPort, boolean daemon) {
        this.clientPort = clientPort;
        this.daemon = daemon;
    }

    /**
     * Returns the port that clients should use to connect to this embedded server.
     *
     * @return dynamically determined client port
     */
    public int getClientPort() {
        return this.clientPort;
    }

    /**
     * Specify whether to start automatically. Default is true.
     *
     * @param autoStartup whether to start automatically
     */
    public void setAutoStartup(boolean autoStartup) {
        this.autoStartup = autoStartup;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean isAutoStartup() {
        return this.autoStartup;
    }

    /**
     * Specify the lifecycle phase for the embedded server.
     *
     * @param phase the lifecycle phase
     */
    public void setPhase(int phase) {
        this.phase = phase;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int getPhase() {
        return this.phase;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean isRunning() {
        return (zkServerThread != null);
    }

    /**
     * Start the ZooKeeper server in a background thread.
     * <p>
     * Register an error handler via {@link #setErrorHandler} in order to handle
     * any exceptions thrown during startup or execution.
     */
    @Override
    public synchronized void start() {
        if (zkServerThread == null) {
            zkServerThread = new Thread(new ServerRunnable(), "ZooKeeper Server Starter");
            zkServerThread.setDaemon(daemon);
            zkServerThread.start();
        }
    }

    /**
     * Shutdown the ZooKeeper server.
     */
    @Override
    public synchronized void stop() {
        if (zkServerThread != null) {
            // The shutdown method is protected...thus this hack to invoke it.
            // This will log an exception on shutdown; see
            // https://issues.apache.org/jira/browse/ZOOKEEPER-1873 for details.
            try {
                Method shutdown = ZooKeeperServerMain.class.getDeclaredMethod("shutdown");
                shutdown.setAccessible(true);
                shutdown.invoke(zkServer);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }

            // It is expected that the thread will exit after
            // the server is shutdown; this will block until
            // the shutdown is complete.
            try {
                zkServerThread.join(5000);
                zkServerThread = null;
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
                logger.warn("Interrupted while waiting for embedded ZooKeeper to exit");
                // abandoning zk thread
                zkServerThread = null;
            }
        }
    }

    /**
     * Stop the server if running and invoke the callback when complete.
     */
    @Override
    public void stop(Runnable callback) {
        stop();
        callback.run();
    }

    /**
     * Provide an {@link ErrorHandler} to be invoked if an Exception is thrown from the ZooKeeper server thread. If none
     * is provided, only error-level logging will occur.
     *
     * @param errorHandler the {@link ErrorHandler} to be invoked
     */
    public void setErrorHandler(ErrorHandler errorHandler) {
        this.errorHandler = errorHandler;
    }

    /**
     * Runnable implementation that starts the ZooKeeper server.
     */
    private class ServerRunnable implements Runnable {

        @Override
        public void run() {
            try {
                Properties properties = new Properties();
                File file = new File(System.getProperty("java.io.tmpdir")
                        + File.separator + UUID.randomUUID());
                file.deleteOnExit();
                properties.setProperty("dataDir", file.getAbsolutePath());
                properties.setProperty("clientPort", String.valueOf(clientPort));

                QuorumPeerConfig quorumPeerConfig = new QuorumPeerConfig();
                quorumPeerConfig.parseProperties(properties);

                zkServer = new ZooKeeperServerMain();
                ServerConfig configuration = new ServerConfig();
                configuration.readFrom(quorumPeerConfig);

                zkServer.runFromConfig(configuration);
            } catch (Exception e) {
                if (errorHandler != null) {
                    errorHandler.handleError(e);
                } else {
                    logger.error("Exception running embedded ZooKeeper", e);
                }
            }
        }
    }

}
dubbo-consumer.properties
dubbo.application.name=samples-annotation-consumer
dubbo.registry.address=zookeeper://${zookeeper.address:127.0.0.1}:2181
dubbo.consumer.timeout=1000
dubbo-provider.properties
dubbo.application.name=samples-annotation-provider
dubbo.registry.address=zookeeper://${zookeeper.address:127.0.0.1}:2181
dubbo.protocol.name=dubbo
dubbo.protocol.port=20880
log4j.properties
#
#
#   Licensed to the Apache Software Foundation (ASF) under one or more
#   contributor license agreements.  See the NOTICE file distributed with
#   this work for additional information regarding copyright ownership.
#   The ASF licenses this file to You under the Apache License, Version 2.0
#   (the "License"); you may not use this file except in compliance with
#   the License.  You may obtain a copy of the License at
#  
#       http://www.apache.org/licenses/LICENSE-2.0
#  
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.
#  
#

###set log levels###
log4j.rootLogger=info, stdout
###output to the console###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=[%d{dd/MM/yy hh:mm:ss:sss z}] %t %5p %c{2}: %m%n

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