Radio example implementation

speaker/bnd.bnd

@@ -0,0 +1,7 @@
+Bundle-Version: 1.0.0
+Private-Package: speaker
+Bundle-Activator: speaker.Speaker
+
+-buildfeatures:
+-buildpath: \
+    outputapi;version=latest

speaker/src/speaker/Speaker.java

@@ -0,0 +1,25 @@
+package speaker;
+
+import org.osgi.framework.BundleActivator;
+import org.osgi.framework.BundleContext;
+import org.osgi.framework.ServiceRegistration;
+import outputapi.Output;
+
+import java.util.Dictionary;
+import java.util.Hashtable;
+
+public class Speaker implements BundleActivator {
+    private ServiceRegistration registration;
+
+    @Override
+    public void start(BundleContext context) throws Exception {
+        Dictionary<String, Object> props = new Hashtable<>();
+        props.put("type", "Speaker");
+        registration = context.registerService( Output.class, new SpeakerOutput(), props);
+    }
+
+    @Override
+    public void stop(BundleContext context) throws Exception {
+        registration.unregister();
+    }
+}

speaker/src/speaker/SpeakerOutput.java

@@ -0,0 +1,10 @@
+package speaker;
+
+import outputapi.Output;
+
+public class SpeakerOutput implements Output {
+    @Override
+    public void write(String sound) {
+        System.out.println(sound);
+    }
+}