The integration and configuration guide of Autoservice Processor framework in the Java class library
Autoservice Processor is a framework for generating the Java service provider interface (SPI).In the Java library, using Autoservice Processor can easily implement the SPI function and provide a mechanism for automatic mining and registration services.This article will introduce how to integrate and configure the Autoservice Processor framework and provide the corresponding Java code examples.
# Preparation
Before starting to use Autoservice Processor, you need the following preparations:
1. JDK 1.8 or higher version
2. Maven or Gradle Construction Tools
# T
1. Add Autoservice dependencies to the maven or Gradle project's pom.xml or Build.gradle file:
**Maven:**
<dependency>
<groupId>com.google.auto.service</groupId>
<artifactId>auto-service</artifactId>
<version>1.0-rc4</version>
</dependency>
**Gradle:**
groovy
compile 'com.google.auto.service:auto-service:1.0-rc4'
2. Create an interface to define your SPI interface.For example, we create an interface called `myServiceProvider`:
package com.example.spi;
public interface MyServiceProvider {
void doSomething();
}
3. Create a class that implements the interface and use the `@Autoservice` annotation to mark.For example, we create two categories `myServicea` and` myServiceb`:
package com.example.spi;
import com.google.auto.service.AutoService;
@AutoService(MyServiceProvider.class)
public class MyServiceA implements MyServiceProvider {
@Override
public void doSomething() {
System.out.println("MyServiceA is doing something.");
}
}
package com.example.spi;
import com.google.auto.service.AutoService;
@AutoService(MyServiceProvider.class)
public class MyServiceB implements MyServiceProvider {
@Override
public void doSomething() {
System.out.println("MyServiceB is doing something.");
}
}
4. Add Autoservice Processor plugin to the project's pom.xml or Build.gradle file:
**Maven:**
<build>
<plugins>
<plugin>
<groupId>org.bsc.maven</groupId>
<artifactId>maven-processor-plugin</artifactId>
<version>3.3.3</version>
<executions>
<execution>
<goals>
<goal>process</goal>
</goals>
<phase>generate-sources</phase>
<configuration>
<processors>
<processor>com.google.auto.service.AutoServiceProcessor</processor>
</processors>
</configuration>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>com.google.auto.service</groupId>
<artifactId>auto-service</artifactId>
<version>1.0-rc4</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
**Gradle:**
groovy
apply plugin: 'java'
apply plugin: 'org.bsc.maven'
dependencies {
compile 'com.google.auto.service:auto-service:1.0-rc4'
}
annotationProcessor('com.google.auto.service:auto-service:1.0-rc4')
The above configuration will automatically use Autoservice Processor to generate Meta-INF/Services directory and related configuration files when compiling.
# Use the SPI generated by the SPI generated by Autoservice Processor
Autoservice Processor will automatically generate `meta-inF/Services` directory and related configuration files for identification and registration of SPI implementation.In the configuration file, each service provider interface has a separate file, which includes a full -limited name of the class that implements the interface.For the example above, the following file will be generated:
**META-INF/services/com.example.spi.MyServiceProvider:**
com.example.spi.MyServiceA
com.example.spi.MyServiceB
The SPI -generated by this configuration file can be loaded through the `ServiceLoader` class.For example:
package com.example.spi;
import java.util.ServiceLoader;
public class Main {
public static void main(String[] args) {
ServiceLoader<MyServiceProvider> providers = ServiceLoader.load(MyServiceProvider.class);
for (MyServiceProvider provider : providers) {
provider.doSomething();
}
}
}
This example will be printed:
MyServiceA is doing something.
MyServiceB is doing something.
This shows that Autoservice Processor has successfully discovered and registered a class that implements the `MyServiceProvider` interface.
# in conclusion
By using Autoservice Processor, you can easily implement the Java SPI function and automatically discover and register service implementation, thereby improving development efficiency.This article introduces how to integrate and configure Autoservice Processor and provide the corresponding Java code example.I hope this article can help you better understand and use the Autoservice Processor framework.
