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Right-click the project com.sample.blueprint.helloworld.api and create a new Interface as shown in the figure.
Name the Interface as HelloWorldService and package name as com.sample.blueprint.helloworld.api, then click Finish.

Modify the code of HelloWorldService as follows.

Code Block

	java
	java
title	HelloWorldService.javajava

package com.sample.blueprint.helloworld.api;

public interface HelloWorldService {
	
	public void hello();
	
	public void startUp();

}

Open META-INF\MANIFEST.MF and make sure com.sample.blueprint.helloworld.api is listed under Exported packages.

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Right-click the project com.sample.blueprint.helloworld.server and create a new class as shown in the figure.
Name the class as HelloWorldServiceImpl and the interface as HelloWorldService, then click Finish.

Modify the code of HelloWorldServiceImpl as follows.

Code Block

	java
	java
title	HelloWorldServiceImpl.javajava

package com.sample.blueprint.helloworld.server;
import com.sample.blueprint.helloworld.api.*;

public class HelloWorldServiceImpl implements HelloWorldService {	

    public void hello() {
            System.out.println("======>>> A message from the server: Hello World!");
    }

    public void startUp() {
            System.out.println("======>>> Starting HelloWorld Server");
    }
}

Right-click the project name and create a Blueprint file, then modify the xml file as follows. The blueprint file is placed under OSGI-INF\blueprint directory automatically.

Code Block

xml	blueprint.xml

<?xml version="1.0" encoding="UTF-8"?>
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0">

      <bean id="helloservice" 
            class="com.sample.blueprint.helloworld.server.HelloWorldServiceImpl"
            init-method="startUp">
      </bean>
      
      <service ref="helloservice" 
          interface="com.sample.blueprint.helloworld.api.HelloWorldService"/>
</blueprint>

Modify META-INF\MANIFEST.MF and make sure com.sample.blueprint.helloworld.api is listed under Import-Pakcage.

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Right-click the project com.sample.blueprint.helloworld.client and create a new class as shown in the figure.
Name the class as HelloWorldClient and click Finish.

Modify the code of HelloWorldClient as follows.

Code Block

	java
	java
title	HelloWorldClient.javajava

package com.sample.blueprint.helloworld.client;
import com.sample.blueprint.helloworld.api.HelloWorldService;

public class HelloWorldClient {

	HelloWorldService helloWorldService = null;

	public void startUp() {
		System.out
				.println("========>>>>Client HelloWorld: About to execute a method from the Hello World service");
		helloWorldService.hello();
		System.out
				.println("========>>>>Client HelloWorld: ... if you didn't just see a Hello World message something went wrong");
	}

	public HelloWorldService getHelloWorldService() {
		return helloWorldService;
	}

	public void setHelloWorldService(HelloWorldService helloWorldService) {
		this.helloWorldService = helloWorldService;

	}
}

Right-click the project name and create a Blueprint file, then modify the xml file as follows. The xml is placed under OSGI-INF\blueprint directory automatically.

Code Block

xml	blueprint.xml

<?xml version="1.0" encoding="UTF-8"?>
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0">
	<reference id="helloservice"
		interface="com.sample.blueprint.helloworld.api.HelloWorldService" />

	<bean id="helloclient" class="com.sample.blueprint.helloworld.client.HelloWorldClient"
		init-method="startUp">
		<property name="helloWorldService" ref="helloservice" />
	</bean>
</blueprint>

Modify META-INF\MANIFEST.MF and make sure com.sample.blueprint.helloworld.api is listed under Import-Pakcage.

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