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{{Ecl_menu}}__NOTOC__
<h4>1. Study the Interfaces</h4>
* [http://www.osgi.org/javadoc/r4v42/org/osgi/framework/Bundle.html Bundle]
* [http://www.osgi.org/javadoc/r4v42/org/osgi/framework/BundleContext.html BundleContext]
* [http://www.osgi.org/javadoc/r4v42/org/osgi/framework/BundleActivator.html BundleActivator]
----------
<h4>2. Define the Bundle Service Interface</h4>
<source lang="java">
package cs.ecl.osgi.simple.declarativeservice.say;
public interface Sayable {
String say();
}
</source>
An implementation of this interface could be:
<source lang="java">
package cs.ecl.osgi.simple.declarativeservice.say.internals;
import java.util.Date;
import cs.ecl.osgi.simple.declarativeservice.say.Sayable;
public class TodaySay implements Sayable {
public String say() {
return " Declarative Service: Today is " + new Date();
}
}
</source>
The relationships between the interface that is exposed to the client and the implementation that is hidden, must be defined in a xml file:
<source lang="xml">
<?xml version="1.0"?>
<component name="sayable">
<implementation class="cs.ecl.osgi.simple.declarativeservice.say.internals.TodaySay"/>
<service>
<provide interface="cs.ecl.osgi.simple.declarativeservice.say.Sayable"/>
</service>
</component>
</source>
The bundle consumer must implement the CommandProvider interface
<source lang="java">
package cs.ecl.osgi.simple.declarativeservice.consumer;
import org.eclipse.osgi.framework.console.CommandInterpreter;
import org.eclipse.osgi.framework.console.CommandProvider;
import cs.ecl.osgi.simple.declarativeservice.say.Sayable;
public class SaySingleConsumer implements CommandProvider {
private Sayable s;
public synchronized void bindSayable(Sayable s) {
this.s = s;
}
public synchronized void unbindSayable(Sayable s) {
this.s = null;
}
public synchronized void _run(CommandInterpreter ci) {
if (s != null) {
System.out.println(s.say());
} else {
ci.println("Error, No Service of type Sayable available");
}
}
@Override
public String getHelp() {
return "\n\t run - EXECUTE the Sayable service";
}
}
</source>
<h4>1. Study the Interfaces</h4>
* [http://www.osgi.org/javadoc/r4v42/org/osgi/framework/Bundle.html Bundle]
* [http://www.osgi.org/javadoc/r4v42/org/osgi/framework/BundleContext.html BundleContext]
* [http://www.osgi.org/javadoc/r4v42/org/osgi/framework/BundleActivator.html BundleActivator]
----------
<h4>2. Define the Bundle Service Interface</h4>
<source lang="java">
package cs.ecl.osgi.simple.declarativeservice.say;
public interface Sayable {
String say();
}
</source>
An implementation of this interface could be:
<source lang="java">
package cs.ecl.osgi.simple.declarativeservice.say.internals;
import java.util.Date;
import cs.ecl.osgi.simple.declarativeservice.say.Sayable;
public class TodaySay implements Sayable {
public String say() {
return " Declarative Service: Today is " + new Date();
}
}
</source>
The relationships between the interface that is exposed to the client and the implementation that is hidden, must be defined in a xml file:
<source lang="xml">
<?xml version="1.0"?>
<component name="sayable">
<implementation class="cs.ecl.osgi.simple.declarativeservice.say.internals.TodaySay"/>
<service>
<provide interface="cs.ecl.osgi.simple.declarativeservice.say.Sayable"/>
</service>
</component>
</source>
The bundle consumer must implement the CommandProvider interface
<source lang="java">
package cs.ecl.osgi.simple.declarativeservice.consumer;
import org.eclipse.osgi.framework.console.CommandInterpreter;
import org.eclipse.osgi.framework.console.CommandProvider;
import cs.ecl.osgi.simple.declarativeservice.say.Sayable;
public class SaySingleConsumer implements CommandProvider {
private Sayable s;
public synchronized void bindSayable(Sayable s) {
this.s = s;
}
public synchronized void unbindSayable(Sayable s) {
this.s = null;
}
public synchronized void _run(CommandInterpreter ci) {
if (s != null) {
System.out.println(s.say());
} else {
ci.println("Error, No Service of type Sayable available");
}
}
@Override
public String getHelp() {
return "\n\t run - EXECUTE the Sayable service";
}
}
</source>
