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October 23, 2006
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Tour de OSGi Console

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After feeling like one of those people in the Lost TV series that disappears from the island… (was tracing some file handle leak problem from hell) I finished up an article regarding using and extending the OSGi console in Eclipse. For those who don’t know, launching Eclipse with the -console parameter can be a ton of fun (you can start and stop things and take down Eclipse in no time!). If you type help in the console, you’ll notice a ton of commands available. Ever wonder how to have your own command (can be useful in debugging situations regarding your specific service)? Well, wonder no more, here’s a simple example from the upcoming article (the important parts are implementing CommandProvider and prefixing commands as methods that start with the ‘_’ character):


public class Activator 
     implements BundleActivator, CommandProvider {

 private BundleContext context;

 public void start(BundleContext context) throws Exception {
  this.context = context;
  Hashtable properties = new Hashtable();
  context.registerService(CommandProvider.class.getName(), 
                     this, properties);
 }

 public String getHelp() {
  StringBuffer buffer = new StringBuffer();
  buffer.append("\tuname - framework information\n");
  return buffer.toString();
 }

 public void stop(BundleContext context) throws Exception {}
 
 public void _uname(CommandInterpreter ci) throws Exception {
  String vendor = 
                     context.getProperty(Constants.FRAMEWORK_VENDOR);
  String version = 
                     context.getProperty(Constants.FRAMEWORK_VERSION);
  String osName = 
                     context.getProperty(Constants.FRAMEWORK_OS_NAME);
  String osVersion = 
                     context.getProperty(Constants.FRAMEWORK_OS_VERSION);
  System.out.println("\n " + vendor + " " 
    + version + " (" + osName + " " 
    + osVersion + ")");
 }

The end result should look something like this:

work