Radio example implementation

Radio/bnd.bnd

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+Bundle-Version: 1.0.0
+Private-Package: Radio
+Bundle-Activator: Radio.Radio
+
+-buildfeatures:
+-buildpath: \
+    channelapi;version=latest,\
+    outputapi;version=latest

Radio/src/Radio/ChannelSelector.java

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+package Radio;
+
+import channelapi.Channel;
+import org.osgi.framework.BundleContext;
+import org.osgi.util.tracker.ServiceTracker;
+
+public class ChannelSelector {
+    private final BundleContext context;
+
+    public ChannelSelector (BundleContext context){
+        this.context = context;
+    }
+
+    public Channel selectChannel(){
+        ServiceTracker<Channel, Channel> serviceTracker = new ServiceTracker<Channel, Channel>(context, Channel.class, null);
+        serviceTracker.open();
+        Channel channel = serviceTracker.getService();
+        serviceTracker.close();
+        return channel;
+    }
+}

Radio/src/Radio/OutputSelector.java

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+package Radio;
+
+import org.osgi.framework.BundleContext;
+import org.osgi.util.tracker.ServiceTracker;
+import outputapi.Output;
+
+public class OutputSelector {
+    private final BundleContext context;
+
+    public OutputSelector(BundleContext context){
+        this.context = context;
+    }
+
+    public Output selectOutput (){
+        ServiceTracker<Output, Output> serviceTracker = new ServiceTracker<>(context, Output.class, null);
+        serviceTracker.open();
+        Output output = serviceTracker.getService();
+        serviceTracker.close();
+        return output;
+    }
+}

Radio/src/Radio/Radio.java

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+package Radio;
+
+import org.osgi.framework.BundleActivator;
+import org.osgi.framework.BundleContext;
+
+public class Radio implements BundleActivator {
+    private ChannelSelector channelSelector = null;
+    private OutputSelector outputSelector = null;
+    private Receiver receiver = null;
+
+    @Override
+    public void start(BundleContext context) throws Exception {
+        System.out.println("Starting radio");
+        channelSelector = new ChannelSelector(context);
+        outputSelector = new OutputSelector(context);
+
+        receiver = new Receiver();
+        System.out.println("Selecting channel");
+        receiver.setChannel(channelSelector.selectChannel());
+        System.out.println("Selecting output");
+        receiver.setOutput(outputSelector.selectOutput());
+        System.out.println("Starting receiver");
+        receiver.start();
+    }
+
+    @Override
+    public void stop(BundleContext context) throws Exception {
+        receiver.stop();
+    }
+}

Radio/src/Radio/Receiver.java

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+package Radio;
+
+import channelapi.Channel;
+import channelapi.Stream;
+import outputapi.Output;
+
+public class Receiver {
+    private Channel channel = null;
+    private Output output = null;
+    private Thread receiverThread = null;
+
+    public Receiver (){
+
+    }
+
+    public void setChannel(Channel channel) {
+        this.channel = channel;
+    }
+
+    public void setOutput(Output output) {
+        this.output = output;
+    }
+
+    public void start (){
+        System.out.println("Starting receiver");
+        Stream stream = channel.getStream();
+
+        receiverThread = new Thread(() -> {
+            try{
+                while (true) {
+                    output.write(stream.read());
+                    Thread.sleep(1000);
+                }
+            } catch (InterruptedException e){
+                System.out.println("Receiver stopped");
+            }
+        });
+        receiverThread.start();
+    }
+
+    public void stop(){
+        receiverThread.interrupt();
+    }
+}

Radio1/bnd.bnd

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+Bundle-Version: 1.0.0
+Private-Package: Radio1
+Bundle-Activator: Radio1.Radio1
+
+-buildfeatures:
+-buildpath: \
+    channelapi;version=latest

Radio1/src/Radio1/Radio1.java

@@ -0,0 +1,25 @@
+package Radio1;
+
+import channelapi.Channel;
+import org.osgi.framework.BundleActivator;
+import org.osgi.framework.BundleContext;
+import org.osgi.framework.ServiceRegistration;
+
+import java.util.Dictionary;
+import java.util.Hashtable;
+
+public class Radio1 implements BundleActivator {
+    private ServiceRegistration registration;
+
+    @Override
+    public void start(BundleContext context) throws Exception {
+        Dictionary<String, Object> props = new Hashtable<>();
+        props.put("name", "Radio 1");
+        registration = context.registerService( Channel.class, new Radio1Channel(), props);
+    }
+
+    @Override
+    public void stop(BundleContext context) throws Exception {
+        registration.unregister();
+    }
+}

Radio1/src/Radio1/Radio1Channel.java

@@ -0,0 +1,13 @@
+package Radio1;
+
+import channelapi.Channel;
+import channelapi.Stream;
+
+public class Radio1Channel implements Channel {
+    private Stream stream = new Radio1Stream();
+
+    @Override
+    public Stream getStream() {
+        return stream;
+    }
+}

Radio1/src/Radio1/Radio1Stream.java

@@ -0,0 +1,10 @@
+package Radio1;
+
+import channelapi.Stream;
+
+public class Radio1Stream implements Stream {
+    @Override
+    public String read() {
+        return "Radio 1";
+    }
+}

Radio538/bnd.bnd

@@ -0,0 +1,7 @@
+Bundle-Version: 1.0.0
+Private-Package: Radio538
+Bundle-Activator: Radio538.Radio538
+
+-buildfeatures:
+-buildpath: \
+    channelapi;version=latest

Radio538/src/Radio538/Radio538.java

@@ -0,0 +1,26 @@
+package Radio538;
+
+import channelapi.Channel;
+import org.osgi.framework.BundleActivator;
+import org.osgi.framework.BundleContext;
+import org.osgi.framework.ServiceRegistration;
+
+import java.util.Dictionary;
+import java.util.Hashtable;
+
+public class Radio538 implements BundleActivator {
+
+    private ServiceRegistration registration;
+
+    @Override
+    public void start(BundleContext context) throws Exception {
+        Dictionary<String, Object> props = new Hashtable<>();
+        props.put("name", "Radio 538");
+        registration = context.registerService( Channel.class, new Radio538Channel(), props);
+    }
+
+    @Override
+    public void stop(BundleContext context) throws Exception {
+        registration.unregister();
+    }
+}

Radio538/src/Radio538/Radio538Channel.java

@@ -0,0 +1,12 @@
+package Radio538;
+
+import channelapi.Channel;
+import channelapi.Stream;
+
+public class Radio538Channel implements Channel {
+    private Stream stream = new Radio538Stream();
+    @Override
+    public Stream getStream() {
+        return stream;
+    }
+}

Radio538/src/Radio538/Radio538Stream.java

@@ -0,0 +1,10 @@
+package Radio538;
+
+import channelapi.Stream;
+
+public class Radio538Stream implements Stream {
+    @Override
+    public String read() {
+        return "Radio 538";
+    }
+}

RadioRunner/bnd.bnd

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+-nobundles: true

RadioRunner/run.bndrun

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+-runfw: org.apache.felix.framework
+
+-runfeatures: shell
+-runbundles: \
+    channelapi;version=latest,\
+    outputapi;version=latest,\
+    Radio538;version=latest,\
+    speaker;version=latest,\
+    Radio;version=latest
+
+-runproperties: \
+	org.ops4j.pax.logging.DefaultServiceLog.level=WARN

channelapi/bnd.bnd

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+Bundle-Version: 1.0.0
+Export-Package: channelapi
+
+-buildfeatures:
+-buildpath:

channelapi/src/channelapi/Channel.java

@@ -0,0 +1,5 @@
+package channelapi;
+
+public interface Channel {
+    Stream getStream();
+}

channelapi/src/channelapi/Stream.java

@@ -0,0 +1,5 @@
+package channelapi;
+
+public interface Stream {
+    String read();
+}

channelapi/src/channelapi/package-info.java

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+@org.osgi.annotation.versioning.Version("1.0.0")
+package channelapi;

outputapi/bnd.bnd

@@ -0,0 +1,5 @@
+Bundle-Version: 1.0.0
+Export-Package: outputapi
+
+-buildfeatures:
+-buildpath:

outputapi/src/outputapi/Output.java

@@ -0,0 +1,5 @@
+package outputapi;
+
+public interface Output {
+    void write (String sound);
+}

outputapi/src/outputapi/package-info.java

@@ -0,0 +1,2 @@
+@org.osgi.annotation.versioning.Version("1.0.0")
+package outputapi;

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);
+    }
+}