OSGI Service CM framework and Java class library integration practice
OSGI Service CM framework and Java class library integration practice
Overview:
OSGI (Open Service Gateway Initiative) is a service -oriented modular framework that can help developers build insertable and scalable applications.OSGI Service CM framework is an important part of OSGI. It provides a unified configuration management function that allows developers to dynamically configure and manage application services.This article will introduce how to integrate the OSGI Service CM framework with the Java class library and provide some Java code examples.
1. Add dependencies:
First, we need to add the dependencies of the OSGI Service CM framework to the project construction file.In the Maven project, you can add the following code fragments to the pom.xml file:
<dependency>
<groupId>org.osgi</groupId>
<artifactId>org.osgi.service.cm</artifactId>
<version>1.6.0</version>
</dependency>
2. Create configuration class:
In the Java code, we need to create a configuration class to implement the configuration management function of the OSGI Service CM framework.You can use the @Configuration annotation to mark this class, and use the @ManageDService annotation to specify the configuration PID (persistence identifier).The example is as follows:
import org.osgi.service.cm.Configuration;
import org.osgi.service.cm.ConfigurationAdmin;
import org.osgi.service.cm.ManagedService;
import org.osgi.framework.BundleContext;
import org.osgi.framework.FrameworkUtil;
import org.springframework.context.annotation.Configuration;
import org.springframework.osgi.context.annotation.Bean;
import org.springframework.osgi.context.annotation.ServiceReference;
@Configuration
public class MyConfiguration implements ManagedService {
@ServiceReference
private ConfigurationAdmin configurationAdmin;
@Override
public void updated(Dictionary<String, ?> properties) throws ConfigurationException {
// Treat the updated configuration attribute
}
@Bean
public Configuration configuration() throws IOException {
BundleContext bundleContext = FrameworkUtil.getBundle(MyConfiguration.class).getBundleContext();
return configurationAdmin.getConfiguration("my.pid", bundleContext.getBundle().getLocation());
}
}
In the above example, we define the MyConfiguration class as a configuration class through the @Configuration annotation, and define a bean called "Configuration" through @Configuration and @Bean annotations.In addition, we also implement the ManageDService interface and process the updated configuration attributes in the Updated method.
3. Registration service:
Through the OSGI Service CM framework, we can register the configuration class as a service so that it can be used by other components.You can use the @Component annotation to mark the configuration class as a component, and use the @SerVice annotation to register it as a service.The example is as follows:
import org.osgi.service.cm.ManagedService;
import org.springframework.stereotype.Component;
import org.osgi.service.component.annotations.Service;
@Component
@Service(value = ManagedService.class)
public class MyConfiguration implements ManagedService {
// ...
}
In the above examples, we marked myconfiguration as a component through @Component annotation and registered it as a ManageDservice type through @Service annotations.
4. Use configuration:
Through the above steps, we have successfully integrated the OSGI Service CM framework with the Java class library and registered the configuration class as a service.Now, we can use this configuration class in other components to obtain configuration attributes.The example is as follows:
import org.osgi.service.cm.Configuration;
import org.osgi.service.cm.ConfigurationAdmin;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class MyComponent {
private Configuration configuration;
@Autowired
public MyComponent(Configuration configuration) {
this.configuration = configuration;
}
// Use the configuration attribute
}
In the above example, we injected the configuration class into the Mycomponent component through the @Autowired annotation and initialized in the constructor.We can then use the configuration class in the Mycomponent class to obtain the configuration attribute.
Summarize:
This article introduces how to integrate the OSGI Service CM framework with the Java class library.First, we need to add a framework.We then create a configuration class to implement the configuration management function and register it as a service.Finally, we can use this configuration class in other components to obtain configuration attributes.Through this integration practice, we can manage and configure services in applications more flexibly.
I hope this article can understand the integration practice of the OSGI Service CM framework and the Java class library.
