How to use OSGI Enroute Configurer Simple Provider framework in the Java library
How to use OSGI Enroute Configurer Simple Provider framework in the Java library
OSGI Enroute Configurer Simple Provider framework is an open source framework for providing configuration parameters in the Java class library.This article will introduce how to use this framework to configure the parameters in the Java library.
1. Add dependencies in Maven project
First, add the following dependencies to the pom.xml file of the Maven project:
<dependency>
<groupId>org.osgi.enroute.configurer.simple.provider</groupId>
<artifactId>org.osgi.enroute.configurer.simple.provider</artifactId>
<version>1.0.0</version>
</dependency>
This will introduce Osgi Enroute Configurer Simple Provider framework to your project.
2. Create configuration parameter interface
Create a configuration parameter interface in your Java library to define your configuration parameters.
public interface MyConfig {
String getStringParam();
int getIntParam();
}
Two configuration parameters are defined in the interface, one is a parameter of the string type `getstringParam`, and the other is the parameter of the integer type` getintparam`.
3. Implement the configuration parameter interface
Create a class in your Java library to implement the above configuration parameter interface.
public class MyConfigImpl implements MyConfig {
@Override
public String getStringParam() {
Return "defaultStringParam"; // Return to the default string parameter value
}
@Override
public int getIntParam() {
Return 100; // Return to the default integer parameter value
}
}
Here, the default parameter value is provided by implementing the configuration parameter interface.
4. Registration configuration parameter service
In the Activator or BundleActivator class of your library, register the configuration parameter service.
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.enroute.configurer.api.ConfigurationDone;
import org.osgi.enroute.configurer.simple.provider.SimpleConfigurer;
import org.osgi.enroute.configurer.simple.provider.api.Parameter;
public class Activator implements BundleActivator {
@Override
public void start(BundleContext bundleContext) throws Exception {
// Create a SimpleConfigurer instance
SimpleConfigurer<MyConfig> configurer = new SimpleConfigurer<>(bundleContext, MyConfig.class);
// Register myconfigImpl instance as configuration parameter service provider
configurer.putService(new MyConfigImpl());
// Set the default parameter configuration
configurer.done();
}
@Override
public void stop(BundleContext bundleContext) throws Exception {
// Clear the configuration parameter service when stopping
SimpleConfigurer.clearServices(bundleContext, MyConfig.class);
}
}
In the Start method of the Activator, we created a Simpleconfigurer instance and used the `Putservice` method to register our configuration parameter implementation class.Then call the `done` method to set the default parameter configuration.Use the `Clearservices` method to clear the configuration parameter service in the Stop method.
5. Get configuration parameters in the application of this type of library
In the application of this type of library, if you use the whiteboard function of OSGI Enroute, you can use the@Reference `annotation to inject the configuration parameter interface into your class.
import org.osgi.enroute.configurer.simple.provider.api.RequireConfigure;
@RequireConfigure(segment = "your-lib-name")
public class MyClass {
@Reference
private MyConfig myConfig;
public void doSomething() {
// Use the configuration parameter
String stringParam = myConfig.getStringParam();
int intParam = myConfig.getIntParam();
// ...
}
}
In the MyClass class, we use the@Reference` annotation to inject the configuration parameter interface into the Myconfig field, and then use the configuration parameter in it.
At this point, you have learned how to use OSGI Enroute Configurer Simple Provider framework in the Java class library to provide configuration parameters.Through this framework, you can easily expose the configuration parameter to other modules and configure it in the application of this type of library.
