dubbo spi 机制 demo

xjs-study/dubbo-project/dubbo-spi-api/pom.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>dubbo-project</artifactId>
+        <groupId>com.xjs</groupId>
+        <version>1.0</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+    <name>DubboSPI接口</name>
+
+    <artifactId>dubbo-spi-api</artifactId>
+
+    <properties>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.dubbo</groupId>
+            <artifactId>dubbo</artifactId>
+        </dependency>
+    </dependencies>
+
+</project>

xjs-study/dubbo-project/dubbo-spi-api/src/main/java/com/xjs/service/HelloService.java

@@ -0,0 +1,18 @@
+package com.xjs.service;
+
+import org.apache.dubbo.common.URL;
+import org.apache.dubbo.common.extension.Adaptive;
+import org.apache.dubbo.common.extension.SPI;
+
+/**
+ * @author xiejs
+ * @since 2022-05-23
+ */
+@SPI("human")
+public interface HelloService {
+
+    String sayHello();
+
+    @Adaptive
+    String sayHello(URL url);
+}

xjs-study/dubbo-project/dubbo-spi-impl/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">
+    <parent>
+        <artifactId>dubbo-project</artifactId>
+        <groupId>com.xjs</groupId>
+        <version>1.0</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+    <name>DubboSPI实现</name>
+
+    <artifactId>dubbo-spi-impl</artifactId>
+
+    <properties>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.xjs</groupId>
+            <artifactId>dubbo-spi-api</artifactId>
+            <version>1.0</version>
+        </dependency>
+    </dependencies>
+
+</project>

xjs-study/dubbo-project/dubbo-spi-impl/src/main/java/com/xjs/service/impl/DogHelloService.java

@@ -0,0 +1,20 @@
+package com.xjs.service.impl;
+
+import com.xjs.service.HelloService;
+import org.apache.dubbo.common.URL;
+
+/**
+ * @author xiejs
+ * @since 2022-05-23
+ */
+public class DogHelloService implements HelloService {
+    @Override
+    public String sayHello() {
+        return "你在狗叫什么！";
+    }
+
+    @Override
+    public String sayHello(URL url) {
+        return "wa wa url";
+    }
+}

xjs-study/dubbo-project/dubbo-spi-impl/src/main/java/com/xjs/service/impl/HumanHelloService.java

@@ -0,0 +1,20 @@
+package com.xjs.service.impl;
+
+import com.xjs.service.HelloService;
+import org.apache.dubbo.common.URL;
+
+/**
+ * @author xiejs
+ * @since 2022-05-23
+ */
+public class HumanHelloService implements HelloService {
+    @Override
+    public String sayHello() {
+        return "傻逼你好";
+    }
+
+    @Override
+    public String sayHello(URL url) {
+        return "hello url";
+    }
+}

xjs-study/dubbo-project/dubbo-spi-impl/src/main/resources/META-INF/dubbo/com.xjs.service.HelloService

@@ -0,0 +1,2 @@
+human=com.xjs.service.impl.HumanHelloService
+dog=com.xjs.service.impl.DogHelloService

xjs-study/dubbo-project/dubbo-spi-main/pom.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>dubbo-project</artifactId>
+        <groupId>com.xjs</groupId>
+        <version>1.0</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+    <name>DubboSPI调用</name>
+
+    <artifactId>dubbo-spi-main</artifactId>
+
+    <properties>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.xjs</groupId>
+            <artifactId>dubbo-spi-api</artifactId>
+            <version>1.0</version>
+        </dependency>
+        <dependency>
+            <groupId>com.xjs</groupId>
+            <artifactId>dubbo-spi-impl</artifactId>
+            <version>1.0</version>
+        </dependency>
+    </dependencies>
+
+</project>

xjs-study/dubbo-project/dubbo-spi-main/src/main/java/com/xjs/DubboAdaptiveMain.java

@@ -0,0 +1,26 @@
+package com.xjs;
+
+import com.xjs.service.HelloService;
+import org.apache.dubbo.common.URL;
+import org.apache.dubbo.common.extension.ExtensionLoader;
+
+/**
+ * @author xiejs
+ * @since 2022-05-23
+ */
+public class DubboAdaptiveMain {
+
+    public static void main(String[] args) {
+        URL url = URL.valueOf("test://localhost/hello?hello.service=dog");
+
+        HelloService helloService = ExtensionLoader.getExtensionLoader(HelloService.class).getAdaptiveExtension();
+
+
+        String s = helloService.sayHello(url);
+
+        System.out.println(s);
+
+
+    }
+
+}

xjs-study/dubbo-project/dubbo-spi-main/src/main/java/com/xjs/DubboSpiMain.java

@@ -0,0 +1,27 @@
+package com.xjs;
+
+import com.xjs.service.HelloService;
+import org.apache.dubbo.common.extension.ExtensionLoader;
+
+import java.util.Set;
+
+/**
+ * @author xiejs
+ * @since 2022-05-23
+ */
+public class DubboSpiMain {
+
+    public static void main(String[] args) {
+        //获取扩展加载器
+        ExtensionLoader<HelloService> loader = ExtensionLoader.getExtensionLoader(HelloService.class);
+
+        //遍历所有支持的扩展点
+        Set<String> extensions = loader.getSupportedExtensions();
+
+        for (String extension : extensions) {
+            HelloService helloService = loader.getExtension(extension);
+            System.out.println(helloService.sayHello());
+        }
+    }
+
+}

xjs-study/dubbo-project/pom.xml

@@ -14,6 +14,9 @@
         <module>service-api</module>
         <module>service-provider</module>
         <module>service-consumer</module>
+        <module>dubbo-spi-api</module>
+        <module>dubbo-spi-impl</module>
+        <module>dubbo-spi-main</module>
     </modules>
 
     <artifactId>dubbo-project</artifactId>

xjs-study/java-spi/pom.xml

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>xjs-study</artifactId>
+        <groupId>com.xjs</groupId>
+        <version>1.0</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+    <packaging>pom</packaging>
+    <name>JavaSPI机制</name>
+    <modules>
+        <module>spi-api</module>
+        <module>spi-impl</module>
+        <module>spi-main</module>
+    </modules>
+
+    <artifactId>java-spi</artifactId>
+
+    <properties>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+</project>

xjs-study/java-spi/spi-api/pom.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>java-spi</artifactId>
+        <groupId>com.xjs</groupId>
+        <version>1.0</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+    <packaging>pom</packaging>
+    <name>JavaSPI接口</name>
+
+    <artifactId>spi-api</artifactId>
+
+    <properties>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+</project>

xjs-study/java-spi/spi-api/src/main/java/com/xjs/service/HelloService.java

@@ -0,0 +1,10 @@
+package com.xjs.service;
+
+/**
+ * @author xiejs
+ * @since 2022-05-23
+ */
+public interface HelloService {
+
+    String sayHello();
+}

xjs-study/java-spi/spi-impl/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">
+    <parent>
+        <artifactId>java-spi</artifactId>
+        <groupId>com.xjs</groupId>
+        <version>1.0</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+    <name>JavaSPI实现</name>
+
+    <artifactId>spi-impl</artifactId>
+
+    <properties>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.xjs</groupId>
+            <artifactId>spi-api</artifactId>
+            <version>1.0</version>
+        </dependency>
+    </dependencies>
+
+</project>

xjs-study/java-spi/spi-impl/src/main/java/com/xjs/service/impl/DogHelloService.java

@@ -0,0 +1,14 @@
+package com.xjs.service.impl;
+
+import com.xjs.service.HelloService;
+
+/**
+ * @author xiejs
+ * @since 2022-05-23
+ */
+public class DogHelloService implements HelloService {
+    @Override
+    public String sayHello() {
+        return "傻逼啊你";
+    }
+}

xjs-study/java-spi/spi-impl/src/main/java/com/xjs/service/impl/HumanHelloService.java

@@ -0,0 +1,14 @@
+package com.xjs.service.impl;
+
+import com.xjs.service.HelloService;
+
+/**
+ * @author xiejs
+ * @since 2022-05-23
+ */
+public class HumanHelloService implements HelloService {
+    @Override
+    public String sayHello() {
+        return "Hello 你好！";
+    }
+}

xjs-study/java-spi/spi-impl/src/main/resources/META-INF/services/com.xjs.service.HelloService

@@ -0,0 +1,3 @@
+com.xjs.service.impl.HumanHelloService
+com.xjs.service.impl.DogHelloService
+

xjs-study/java-spi/spi-main/pom.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>java-spi</artifactId>
+        <groupId>com.xjs</groupId>
+        <version>1.0</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+    <name>JavaSPI调用</name>
+
+    <artifactId>spi-main</artifactId>
+
+    <properties>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.xjs</groupId>
+            <artifactId>spi-api</artifactId>
+            <version>1.0</version>
+        </dependency>
+        <dependency>
+            <groupId>com.xjs</groupId>
+            <artifactId>spi-impl</artifactId>
+            <version>1.0</version>
+        </dependency>
+    </dependencies>
+
+</project>

xjs-study/java-spi/spi-main/src/main/java/com/xjs/JavaSpiMain.java

@@ -0,0 +1,20 @@
+package com.xjs;
+
+import com.xjs.service.HelloService;
+
+import java.util.ServiceLoader;
+
+/**
+ * @author xiejs
+ * @since 2022-05-23
+ */
+public class JavaSpiMain {
+
+    public static void main(String[] args) {
+        final ServiceLoader<HelloService> helloServices = ServiceLoader.load(HelloService.class);
+        for (HelloService helloService : helloServices) {
+            System.out.println(helloService.getClass().getName()+":"+helloService.sayHello());
+        }
+    }
+
+}

xjs-study/pom.xml

@@ -14,6 +14,7 @@
         <module>xjs-study-base</module>
         <module>netty-project</module>
         <module>dubbo-project</module>
+        <module>java-spi</module>
     </modules>
 
     <artifactId>xjs-study</artifactId>