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The following commit(s) were added to refs/heads/main by this push:
     new a88d34c  feat:add metadata-samples (#12)
a88d34c is described below

commit a88d34c540fbd2efd2368e717cf3ece6441fab89
Author: 其一 <78294896+qy...@users.noreply.github.com>
AuthorDate: Wed Jul 10 18:01:55 2024 +0800

    feat:add metadata-samples (#12)
    
    * feat:add metadata-samples
    
    * feat:add Licensed
    
    * feat:add tests
    
    * feat: code format
    
    ---------
    
    Co-authored-by: 其一 <yuanhon...@cai-inc.com>
---
 .../samples-spi-metadata/pom.xml                   |  28 ++++++
 .../samples-spi-metadata-consul/pom.xml            | 110 +++++++++++++++++++++
 .../dubbo/samples/spi/metadata/ConsulConsumer.java |  38 +++++++
 .../dubbo/samples/spi/metadata/ConsulProvider.java |  37 +++++++
 .../samples/spi/metadata/api/DemoService.java      |  26 +++++
 .../samples/spi/metadata/impl/DemoServiceImpl.java |  35 +++++++
 .../src/main/resources/log4j2.xml                  |  29 ++++++
 .../src/main/resources/spring/consul-consumer.xml  |  35 +++++++
 .../src/main/resources/spring/consul-provider.xml  |  38 +++++++
 .../src/test/java/metadata/DemoServiceIT.java      |  42 ++++++++
 .../samples-spi-metadata-etcd/pom.xml              | 110 +++++++++++++++++++++
 .../dubbo/samples/spi/metadata/EtcdConsumer.java   |  36 +++++++
 .../dubbo/samples/spi/metadata/EtcdProvider.java   |  37 +++++++
 .../samples/spi/metadata/api/DemoService.java      |  26 +++++
 .../samples/spi/metadata/impl/DemoServiceImpl.java |  35 +++++++
 .../src/main/resources/log4j2.xml                  |  29 ++++++
 .../main/resources/spring/metadata-consumer.xml    |  35 +++++++
 .../main/resources/spring/metadata-provider.xml    |  38 +++++++
 .../src/test/java/metadata/DemoServiceIT.java      |  43 ++++++++
 19 files changed, 807 insertions(+)

diff --git a/5-dubbo-spi-metadata-samples/samples-spi-metadata/pom.xml 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/pom.xml
new file mode 100644
index 0000000..7ecdc7e
--- /dev/null
+++ b/5-dubbo-spi-metadata-samples/samples-spi-metadata/pom.xml
@@ -0,0 +1,28 @@
+<?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>
+    <parent>
+        <groupId>org.apache.dubbo</groupId>
+        <artifactId>dubbo-samples-spi</artifactId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+
+    <groupId>org.apache.dubbo</groupId>
+    <artifactId>samples-spi-metadata</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>pom</packaging>
+    <modules>
+        <module>samples-spi-metadata-consul</module>
+        <module>samples-spi-metadata-etcd</module>
+        <module>samples-spi-metadata-rest</module>
+    </modules>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+</project>
\ No newline at end of file
diff --git 
a/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/pom.xml
 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/pom.xml
new file mode 100644
index 0000000..1b8d726
--- /dev/null
+++ 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/pom.xml
@@ -0,0 +1,110 @@
+<?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>
+    <parent>
+        <groupId>org.apache.dubbo</groupId>
+        <artifactId>samples-spi-metadata</artifactId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>samples-spi-metadata-consul</artifactId>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework</groupId>
+                <artifactId>spring-framework-bom</artifactId>
+                <version>${spring.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <dependency>
+                <groupId>org.apache.dubbo</groupId>
+                <artifactId>dubbo-bom</artifactId>
+                <version>${dubbo.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <dependency>
+                <groupId>org.apache.dubbo.extensions</groupId>
+                <artifactId>dubbo-extensions-bom</artifactId>
+                <version>${spi.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.dubbo</groupId>
+            <artifactId>dubbo</artifactId>
+            <version>${dubbo.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.dubbo</groupId>
+            
<artifactId>dubbo-zookeeper-curator5-spring-boot-starter</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-context-support</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.dubbo.extensions</groupId>
+            <artifactId>dubbo-metadata-report-consul</artifactId>
+            <version>${spi.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-slf4j-impl</artifactId>
+        </dependency>
+    </dependencies>
+
+    <profiles>
+        <!-- For jdk 11 above JavaEE annotation -->
+        <profile>
+            <id>javax.annotation</id>
+            <activation>
+                <jdk>[1.11,)</jdk>
+            </activation>
+            <dependencies>
+                <dependency>
+                    <groupId>javax.annotation</groupId>
+                    <artifactId>javax.annotation-api</artifactId>
+                    <version>${javax.annotation-api.version}</version>
+                </dependency>
+            </dependencies>
+        </profile>
+    </profiles>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+            </plugin>
+        </plugins>
+    </build>
+</project>
\ No newline at end of file
diff --git 
a/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/java/org/apache/dubbo/samples/spi/metadata/ConsulConsumer.java
 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/java/org/apache/dubbo/samples/spi/metadata/ConsulConsumer.java
new file mode 100644
index 0000000..4c695fc
--- /dev/null
+++ 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/java/org/apache/dubbo/samples/spi/metadata/ConsulConsumer.java
@@ -0,0 +1,38 @@
+/*
+ *
+ *   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 org.apache.dubbo.samples.spi.metadata;
+
+
+import org.apache.dubbo.samples.spi.metadata.api.DemoService;
+
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+
+public class ConsulConsumer {
+
+    public static void main(String[] args) throws InterruptedException {
+        ClassPathXmlApplicationContext context = new 
ClassPathXmlApplicationContext(new String[]{"spring/consul-consumer.xml"});
+        context.start();
+        DemoService demoService = context.getBean("demoService", 
DemoService.class);
+
+        String hello = demoService.sayHello("world");
+        System.out.println(hello);
+    }
+}
diff --git 
a/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/java/org/apache/dubbo/samples/spi/metadata/ConsulProvider.java
 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/java/org/apache/dubbo/samples/spi/metadata/ConsulProvider.java
new file mode 100644
index 0000000..1bf8365
--- /dev/null
+++ 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/java/org/apache/dubbo/samples/spi/metadata/ConsulProvider.java
@@ -0,0 +1,37 @@
+/*
+ *
+ *   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 org.apache.dubbo.samples.spi.metadata;
+
+
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+import java.util.concurrent.CountDownLatch;
+
+
+public class ConsulProvider {
+
+    public static void main(String[] args) throws InterruptedException {
+        ClassPathXmlApplicationContext context = new 
ClassPathXmlApplicationContext(new String[]{"spring/consul-provider.xml"});
+        context.start();
+
+        System.out.println("dubbo service started");
+        new CountDownLatch(1).await();
+    }
+}
diff --git 
a/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/java/org/apache/dubbo/samples/spi/metadata/api/DemoService.java
 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/java/org/apache/dubbo/samples/spi/metadata/api/DemoService.java
new file mode 100644
index 0000000..4a0cb60
--- /dev/null
+++ 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/java/org/apache/dubbo/samples/spi/metadata/api/DemoService.java
@@ -0,0 +1,26 @@
+/*
+ *
+ *   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 org.apache.dubbo.samples.spi.metadata.api;
+
+public interface DemoService {
+
+    String sayHello(String name);
+
+}
diff --git 
a/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/java/org/apache/dubbo/samples/spi/metadata/impl/DemoServiceImpl.java
 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/java/org/apache/dubbo/samples/spi/metadata/impl/DemoServiceImpl.java
new file mode 100644
index 0000000..eb326f4
--- /dev/null
+++ 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/java/org/apache/dubbo/samples/spi/metadata/impl/DemoServiceImpl.java
@@ -0,0 +1,35 @@
+/*
+ *
+ *   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 org.apache.dubbo.samples.spi.metadata.impl;
+
+
+import org.apache.dubbo.config.annotation.DubboService;
+import org.apache.dubbo.rpc.RpcContext;
+import org.apache.dubbo.samples.spi.metadata.api.DemoService;
+
+@DubboService
+public class DemoServiceImpl implements DemoService {
+
+    @Override
+    public String sayHello(String name) {
+        return "Hello " + name + ", response from provider: " + 
RpcContext.getContext().getLocalAddress();
+    }
+
+}
diff --git 
a/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/resources/log4j2.xml
 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/resources/log4j2.xml
new file mode 100644
index 0000000..69e1321
--- /dev/null
+++ 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/resources/log4j2.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ 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.
+  -->
+<Configuration status="WARN">
+    <Appenders>
+        <Console name="Console" target="SYSTEM_OUT" follow="true">
+            <PatternLayout pattern="%style{%d{HH:mm:ss.SSS}}{Magenta} 
%style{|-}{White}%highlight{%-5p} [%t] %style{%40.40c}{Cyan}:%style{%-3L}{Blue} 
%style{-|}{White} 
%m%n%rEx{filters(jdk.internal.reflect,java.lang.reflect,sun.reflect)}" 
disableAnsi="false" charset="UTF-8"/>
+        </Console>
+    </Appenders>
+    <Loggers>
+        <Root level="info">
+            <AppenderRef ref="Console"/>
+        </Root>
+    </Loggers>
+</Configuration>
diff --git 
a/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/resources/spring/consul-consumer.xml
 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/resources/spring/consul-consumer.xml
new file mode 100644
index 0000000..bc89199
--- /dev/null
+++ 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/resources/spring/consul-consumer.xml
@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~
+  ~   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.
+  ~
+  -->
+
+<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-4.3.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/>
+
+    <dubbo:application name="dubbo-spi-metadata-consul-consumer"/>
+
+    <dubbo:registry address="zookeeper://${zookeeper.address:127.0.0.1}:2181"/>
+
+    <dubbo:metadata-report 
address="consul://${consul.address:127.0.0.1}:${consul.port:8500}"/>
+
+    <dubbo:reference id="demoService" 
interface="org.apache.dubbo.samples.spi.metadata.api.DemoService"/>
+</beans>
diff --git 
a/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/resources/spring/consul-provider.xml
 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/resources/spring/consul-provider.xml
new file mode 100644
index 0000000..7234c39
--- /dev/null
+++ 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/main/resources/spring/consul-provider.xml
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~
+  ~   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.
+  ~
+  -->
+
+<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-4.3.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/>
+
+    <dubbo:application name="dubbo-spi-metadata-consul-provider"/>
+
+    <dubbo:registry address="zookeeper://${zookeeper.address:127.0.0.1}:2181"/>
+
+    <dubbo:metadata-report  
address="consul://${consul.address:127.0.0.1}:${consul.port:8500}"/>
+
+    <bean id="demoService" 
class="org.apache.dubbo.samples.spi.metadata.impl.DemoServiceImpl"/>
+
+    <dubbo:service 
interface="org.apache.dubbo.samples.spi.metadata.api.DemoService" 
ref="demoService"/>
+
+</beans>
diff --git 
a/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/test/java/metadata/DemoServiceIT.java
 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/test/java/metadata/DemoServiceIT.java
new file mode 100644
index 0000000..969503f
--- /dev/null
+++ 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-consul/src/test/java/metadata/DemoServiceIT.java
@@ -0,0 +1,42 @@
+/*
+ * 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 metadata;
+
+
+import org.apache.dubbo.samples.spi.metadata.api.DemoService;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(locations = "classpath*:spring/consul-consumer.xml")
+public class DemoServiceIT {
+    @Autowired
+    @Qualifier("demoService")
+    private DemoService demoService;
+
+    @Test
+    public void test() throws Exception {
+        Assert.assertTrue(demoService.sayHello("world").startsWith("Hello 
world"));
+    }
+}
diff --git 
a/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/pom.xml
 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/pom.xml
new file mode 100644
index 0000000..fc05cfc
--- /dev/null
+++ 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/pom.xml
@@ -0,0 +1,110 @@
+<?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>
+    <parent>
+        <groupId>org.apache.dubbo</groupId>
+        <artifactId>samples-spi-metadata</artifactId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>samples-spi-metadata-etcd</artifactId>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework</groupId>
+                <artifactId>spring-framework-bom</artifactId>
+                <version>${spring.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <dependency>
+                <groupId>org.apache.dubbo</groupId>
+                <artifactId>dubbo-bom</artifactId>
+                <version>${dubbo.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <dependency>
+                <groupId>org.apache.dubbo.extensions</groupId>
+                <artifactId>dubbo-extensions-bom</artifactId>
+                <version>${spi.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.dubbo</groupId>
+            <artifactId>dubbo</artifactId>
+            <version>${dubbo.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.dubbo</groupId>
+            
<artifactId>dubbo-zookeeper-curator5-spring-boot-starter</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-context-support</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.dubbo.extensions</groupId>
+            <artifactId>dubbo-metadata-report-etcd</artifactId>
+            <version>${spi.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-slf4j-impl</artifactId>
+        </dependency>
+    </dependencies>
+
+    <profiles>
+        <!-- For jdk 11 above JavaEE annotation -->
+        <profile>
+            <id>javax.annotation</id>
+            <activation>
+                <jdk>[1.11,)</jdk>
+            </activation>
+            <dependencies>
+                <dependency>
+                    <groupId>javax.annotation</groupId>
+                    <artifactId>javax.annotation-api</artifactId>
+                    <version>${javax.annotation-api.version}</version>
+                </dependency>
+            </dependencies>
+        </profile>
+    </profiles>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+            </plugin>
+        </plugins>
+    </build>
+</project>
\ No newline at end of file
diff --git 
a/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/java/org/apache/dubbo/samples/spi/metadata/EtcdConsumer.java
 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/java/org/apache/dubbo/samples/spi/metadata/EtcdConsumer.java
new file mode 100644
index 0000000..010a9aa
--- /dev/null
+++ 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/java/org/apache/dubbo/samples/spi/metadata/EtcdConsumer.java
@@ -0,0 +1,36 @@
+/*
+ *
+ *   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 org.apache.dubbo.samples.spi.metadata;
+
+import org.apache.dubbo.samples.spi.metadata.api.DemoService;
+
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+
+public class EtcdConsumer {
+    public static void main(String[] args) {
+        ClassPathXmlApplicationContext context = new 
ClassPathXmlApplicationContext(new String[]{"spring/metadata-consumer.xml"});
+        context.start();
+        DemoService demoService = context.getBean("demoService", 
DemoService.class);
+
+        String hello = demoService.sayHello("world");
+        System.out.println(hello);
+    }
+}
diff --git 
a/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/java/org/apache/dubbo/samples/spi/metadata/EtcdProvider.java
 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/java/org/apache/dubbo/samples/spi/metadata/EtcdProvider.java
new file mode 100644
index 0000000..2469a6a
--- /dev/null
+++ 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/java/org/apache/dubbo/samples/spi/metadata/EtcdProvider.java
@@ -0,0 +1,37 @@
+/*
+ *
+ *   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 org.apache.dubbo.samples.spi.metadata;
+
+
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+import java.util.concurrent.CountDownLatch;
+
+
+public class EtcdProvider {
+
+    public static void main(String[] args) throws InterruptedException {
+        ClassPathXmlApplicationContext context = new 
ClassPathXmlApplicationContext(new String[]{"spring/metadata-provider.xml"});
+        context.start();
+
+        System.out.println("dubbo service started");
+        new CountDownLatch(1).await();
+    }
+}
diff --git 
a/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/java/org/apache/dubbo/samples/spi/metadata/api/DemoService.java
 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/java/org/apache/dubbo/samples/spi/metadata/api/DemoService.java
new file mode 100644
index 0000000..4a0cb60
--- /dev/null
+++ 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/java/org/apache/dubbo/samples/spi/metadata/api/DemoService.java
@@ -0,0 +1,26 @@
+/*
+ *
+ *   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 org.apache.dubbo.samples.spi.metadata.api;
+
+public interface DemoService {
+
+    String sayHello(String name);
+
+}
diff --git 
a/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/java/org/apache/dubbo/samples/spi/metadata/impl/DemoServiceImpl.java
 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/java/org/apache/dubbo/samples/spi/metadata/impl/DemoServiceImpl.java
new file mode 100644
index 0000000..eb326f4
--- /dev/null
+++ 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/java/org/apache/dubbo/samples/spi/metadata/impl/DemoServiceImpl.java
@@ -0,0 +1,35 @@
+/*
+ *
+ *   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 org.apache.dubbo.samples.spi.metadata.impl;
+
+
+import org.apache.dubbo.config.annotation.DubboService;
+import org.apache.dubbo.rpc.RpcContext;
+import org.apache.dubbo.samples.spi.metadata.api.DemoService;
+
+@DubboService
+public class DemoServiceImpl implements DemoService {
+
+    @Override
+    public String sayHello(String name) {
+        return "Hello " + name + ", response from provider: " + 
RpcContext.getContext().getLocalAddress();
+    }
+
+}
diff --git 
a/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/resources/log4j2.xml
 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/resources/log4j2.xml
new file mode 100644
index 0000000..69e1321
--- /dev/null
+++ 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/resources/log4j2.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ 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.
+  -->
+<Configuration status="WARN">
+    <Appenders>
+        <Console name="Console" target="SYSTEM_OUT" follow="true">
+            <PatternLayout pattern="%style{%d{HH:mm:ss.SSS}}{Magenta} 
%style{|-}{White}%highlight{%-5p} [%t] %style{%40.40c}{Cyan}:%style{%-3L}{Blue} 
%style{-|}{White} 
%m%n%rEx{filters(jdk.internal.reflect,java.lang.reflect,sun.reflect)}" 
disableAnsi="false" charset="UTF-8"/>
+        </Console>
+    </Appenders>
+    <Loggers>
+        <Root level="info">
+            <AppenderRef ref="Console"/>
+        </Root>
+    </Loggers>
+</Configuration>
diff --git 
a/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/resources/spring/metadata-consumer.xml
 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/resources/spring/metadata-consumer.xml
new file mode 100644
index 0000000..a7957ab
--- /dev/null
+++ 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/resources/spring/metadata-consumer.xml
@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~
+  ~   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.
+  ~
+  -->
+
+<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-4.3.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/>
+
+    <dubbo:application name="dubbo-spi-metadata-etcd-consumer"/>
+
+    <dubbo:registry address="zookeeper://${zookeeper.address:127.0.0.1}:2181"/>
+
+    <dubbo:metadata-report 
address="etcd://${etcd.address:localhost}:${etcd.port:2379}"/>
+
+    <dubbo:reference id="demoService" 
interface="org.apache.dubbo.samples.spi.metadata.api.DemoService"/>
+</beans>
diff --git 
a/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/resources/spring/metadata-provider.xml
 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/resources/spring/metadata-provider.xml
new file mode 100644
index 0000000..4ef4d2a
--- /dev/null
+++ 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/main/resources/spring/metadata-provider.xml
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~
+  ~   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.
+  ~
+  -->
+
+<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-4.3.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/>
+
+    <dubbo:application name="dubbo-spi-metadata-etcd-provider"/>
+
+    <dubbo:registry address="zookeeper://${zookeeper.address:127.0.0.1}:2181"/>
+
+    <dubbo:metadata-report protocol="etcd" 
address="etcd://${etcd.address:127.0.0.1}:${etcd.port:2379}"/>
+
+    <bean id="demoService" 
class="org.apache.dubbo.samples.spi.metadata.impl.DemoServiceImpl"/>
+
+    <dubbo:service 
interface="org.apache.dubbo.samples.spi.metadata.api.DemoService" 
ref="demoService"/>
+
+</beans>
diff --git 
a/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/test/java/metadata/DemoServiceIT.java
 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/test/java/metadata/DemoServiceIT.java
new file mode 100644
index 0000000..05b6bac
--- /dev/null
+++ 
b/5-dubbo-spi-metadata-samples/samples-spi-metadata/samples-spi-metadata-etcd/src/test/java/metadata/DemoServiceIT.java
@@ -0,0 +1,43 @@
+/*
+ * 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 metadata;
+
+
+
+import org.apache.dubbo.samples.spi.metadata.api.DemoService;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(locations = "classpath*:spring/metadata-consumer.xml")
+public class DemoServiceIT {
+    @Autowired
+    @Qualifier("demoService")
+    private DemoService demoService;
+
+    @Test
+    public void test() throws Exception {
+        Assert.assertTrue(demoService.sayHello("world").startsWith("Hello 
world"));
+    }
+}


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