OSGi : Develop Simple Apps

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OSGi Activities

• Start and run the Eclipse for OSGi as installed in the previous lecture.
• Open the Subversion Perspective in Eclipse for OSGi.
• Check out the Simple Sample from OSGi Course Repository
• Run the sample and change it.
• Define the main steps involved in developing OSGi applications.
• Write a small tutorial (main steps) about using Eclipse to develop OSGi applications.

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Start the lab activities in the order defined below:

1. Check out the Service Interface
2. Check out the Service Provider
3. Check out the Service Consumer

Steps for Building Bundels

1. Study the Interfaces

• Bundle
• BundleContext
• BundleActivator

2. Define the Bundle that provide the service (Provider Bundle)

2.1 Define the Java Interface that exposes the services

Let us suppose that you want to define a service that allows the user to find a book from the book isbn. Then the interface should look similare with this one:

package cs.ecl.osgi.simple.bookfinder;

public interface BookFinder {
	Book findBook(int isbn) throws BookNotFoundException;
}

Define in the same bundle the classes that you need such as: Book and BookNotFoundException

package cs.ecl.osgi.simple.bookfinder;

public class Book {
	private int isbn;
	private String title;
	
	public Book(int isbn, String title) {
		super();
		this.isbn = isbn;
		this.title = title;
	}

	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public int getIsbn() {
		return isbn;
	}

	public void setIsbn(int isbn) {
		this.isbn = isbn;
	}
}

package cs.ecl.osgi.simple.bookfinder;

public class BookNotFoundException extends Exception {
	private static final long serialVersionUID = -6184839510952070091L;

	public BookNotFoundException() {
		super();
	}

	public BookNotFoundException(String arg0) {
		super(arg0);
	}
}

Define in the MANIFEST.MF that cs.ecl.osgi.simple.bookfinder is the Exported-Package

Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: Bookfinder
Bundle-SymbolicName: cs.ecl.osgi.simple.bookfinder
Bundle-Version: 1.0.0.qualifier
Bundle-RequiredExecutionEnvironment: JavaSE-1.6
Bundle-Vendor: Seneca College - Eclipse Course
Export-Package: cs.ecl.osgi.simple.bookfinder