Dubbo SPI的加载机制

SPI全称为Service Provider Interface，是一种服务发现机制。SPI 的本质是将接口实现类的全限定名配置在文件中，并由服务加载器读取配置文件，加载实现类。

SPI示例

Java SPI示例

• Robot

public interface Robot {
    void sayHello();
}

• RobotImpl

public class Bumblebee implements Robot {
    @Override
    public void sayHello() {
        System.out.println("Hello, I am Bumblebee.");
    }
}

public class OptimusPrime implements Robot {
    @Override
    public void sayHello() {
        System.out.println("Hello, I am Optimus Prime.");
    }
}

• MATA/service

com.agmtopy.testcontainers.completableFuture.impl.Bumblebee
com.agmtopy.testcontainers.completableFuture.impl.OptimusPrime

• JavaSpiTest

@Test
public void test0(){
    ServiceLoader<Robot> robots = ServiceLoader.load(Robot.class);
    robots.forEach(Robot::sayHello);
}

Dubbo SPI示例

• Robot

@SPI
public interface Robot {
    void sayHello();
}

• MATA/dubbo

optimusPrime = com.agmtopy.testcontainers.completableFuture.impl.Bumblebee
bumblebee = com.agmtopy.testcontainers.completableFuture.impl.OptimusPrime