Add static tag route Demo: can be used to reduce time to return by avoid service call accross the IDC.

4-governance/dubbo-samples-tagrouter-static/README.md

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+# governance dubbo using tag router static
+the same effect with project [dubbo-samples-tagrouter](..%2Fdubbo-samples-tagrouter),but use static tag in xml file
+```xml
+<beans>
+    <bean id="demoService" class="org.apache.dubbo.samples.governance.impl.DemoServiceImpl"/>
+    <dubbo:service interface="org.apache.dubbo.samples.governance.api.DemoService" 
+                   ref="demoService" 
+                   tag="tag2"/>
+</beans>
+
+```
+1. step1 run `BasicProvider.java`
+
+> it will start an zookeeper and register two service with dubbo port 20880 with `tag2`
+2. step2 run `BasicProviderOtherPort.java`
+> it will register another two service with dubbo port 20881 with `tag1`
+3. step3 run `BasicConsumer.java` or [DemoServiceIT.java](src%2Ftest%2Fjava%2Forg%2Fapache%2Fdubbo%2Fsamples%2Fgovernance%2FDemoServiceIT.java)
+>  it will consume as blow role
+> * All consumer taged by `tag1` come from provider taged by `tag1` in port 20881
+> * All consumer taged by `tag2` come from provider taged by `tag2` in port 20880
+
+This strategy can be used to reduce `time to return` by route service in some IDC through tag the same tags

4-governance/dubbo-samples-tagrouter-static/case-configuration.yml

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+# 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.
+
+services:
+  zookeeper:
+    image: zookeeper:latest
+
+  dubbo-samples-tagrouter1:
+    type: app
+    basedir: .
+    mainClass: org.apache.dubbo.samples.governance.BasicProvider
+    systemProps:
+      - zookeeper.address=zookeeper
+      - zookeeper.port=2181
+      - dubbo.port=20880
+    waitPortsBeforeRun:
+      - zookeeper:2181
+    checkPorts:
+      - 20880
+    checkLog: "dubbo service started"
+    depends_on:
+      - zookeeper
+
+  dubbo-samples-tagrouter2:
+    type: app
+    basedir: .
+    mainClass: org.apache.dubbo.samples.governance.BasicProvider
+    systemProps:
+      - zookeeper.address=zookeeper
+      - zookeeper.port=2181
+      - dubbo.port=20881
+    waitPortsBeforeRun:
+      - zookeeper:2181
+    checkPorts:
+      - 20881
+    checkLog: "dubbo service started"
+    depends_on:
+      - zookeeper
+
+  dubbo-samples-tagrouter-test:
+    type: test
+    basedir: .
+    tests:
+      - "**/*IT.class"
+    systemProps:
+      - zookeeper.address=zookeeper
+      - zookeeper.port=2181
+    waitPortsBeforeRun:
+      - zookeeper:2181
+      - dubbo-samples-tagrouter1:20880
+      - dubbo-samples-tagrouter2:20881
+    depends_on:
+      - zookeeper
+      - dubbo-samples-tagrouter1
+      - dubbo-samples-tagrouter2

4-governance/dubbo-samples-tagrouter-static/case-versions.conf

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+#
+#
+#   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.
+#
+
+
+# Supported component versions of the test case
+
+# Spring app
+dubbo.version=2.7*, 3.*
+spring.version=4.*, 5.*
+java.version= [<= 11]

4-governance/dubbo-samples-tagrouter-static/pom.xml

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+<?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.
+  ~
+  -->
+
+<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">
+    <groupId>org.apache.dubbo</groupId>
+    <version>1.0-SNAPSHOT</version>
+
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>dubbo-samples-tagrouter-static</artifactId>
+    <name>Dubbo Samples Tag Router static</name>
+    <description>Dubbo Samples Tag Router static</description>
+    <properties>
+        <source.level>1.8</source.level>
+        <target.level>1.8</target.level>
+        <dubbo.version>3.0.7</dubbo.version>
+        <spring.version>4.3.29.RELEASE</spring.version>
+        <junit.version>4.13.1</junit.version>
+        <maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
+    </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</groupId>
+                <artifactId>dubbo-dependencies-zookeeper</artifactId>
+                <version>${dubbo.version}</version>
+                <type>pom</type>
+            </dependency>
+
+            <dependency>
+                <groupId>junit</groupId>
+                <artifactId>junit</artifactId>
+                <version>${junit.version}</version>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.dubbo</groupId>
+            <artifactId>dubbo</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.dubbo</groupId>
+            <artifactId>dubbo-dependencies-zookeeper</artifactId>
+            <type>pom</type>
+        </dependency>
+
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-test</artifactId>
+            <scope>test</scope>
+        </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>1.3.2</version>
+                </dependency>
+            </dependencies>
+        </profile>
+    </profiles>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <source>${source.level}</source>
+                    <target>${target.level}</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <repositories>
+        <repository>
+            <id>apache.snapshots.https</id>
+            <name>Apache Development Snapshot Repository</name>
+            <url>https://repository.apache.org/content/repositories/snapshots</url>
+            <layout>default</layout>
+            <releases>
+                <enabled>false</enabled>
+            </releases>
+            <snapshots>
+                <enabled>true</enabled>
+                <updatePolicy>daily</updatePolicy>
+            </snapshots>
+        </repository>
+    </repositories>
+</project>

4-governance/dubbo-samples-tagrouter-static/src/main/java/org/apache/dubbo/samples/governance/BasicConsumer.java

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+/*
+ *
+ *   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.governance;
+
+import org.apache.dubbo.rpc.RpcContext;
+import org.apache.dubbo.samples.governance.api.DemoService;
+import org.apache.dubbo.samples.governance.api.DemoService2;
+
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+import static org.apache.dubbo.common.constants.CommonConstants.TAG_KEY;
+import static org.apache.dubbo.rpc.Constants.FORCE_USE_TAG;
+
+public class BasicConsumer {
+
+    public static void main(String[] args) {
+        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("spring/dubbo-demo-consumer.xml");
+        context.start();
+        DemoService demoService = context.getBean("demoService", DemoService.class);
+        DemoService2 demoService2 = context.getBean("demoService2", DemoService2.class);
+
+        RpcContext.getContext().setAttachment(TAG_KEY, "tag1");
+        String hello = demoService.sayHello("world");
+        System.out.println(hello);
+
+        RpcContext.getContext().setAttachment(FORCE_USE_TAG, "true");
+        RpcContext.getContext().setAttachment(TAG_KEY, "tag2");
+        String hello2 = demoService2.sayHello("world again");
+        System.out.println(hello2);
+    }
+}

4-governance/dubbo-samples-tagrouter-static/src/main/java/org/apache/dubbo/samples/governance/BasicProvider.java

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+/*
+ *
+ *   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.governance;
+
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+import java.util.concurrent.CountDownLatch;
+
+public class BasicProvider {
+
+    public static void main(String[] args) throws Exception {
+        new EmbeddedZooKeeper(2181, false).start();
+
+        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("spring/dubbo-demo-provider-20880.xml");
+        context.start();
+
+        System.out.println("dubbo service started");
+        new CountDownLatch(1).await();
+    }
+
+}

4-governance/dubbo-samples-tagrouter-static/src/main/java/org/apache/dubbo/samples/governance/BasicProviderOtherPort.java

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+/*
+ *
+ *   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.governance;
+
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+import java.util.concurrent.CountDownLatch;
+
+public class BasicProviderOtherPort {
+
+    public static void main(String[] args) throws Exception {
+        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("spring/dubbo-demo-provider-20881.xml");
+        context.start();
+
+        System.out.println("dubbo service started");
+        new CountDownLatch(1).await();
+    }
+
+}