Activator.java

   1 package org.argeo.cms.internal.kernel;
   2
   3 import java.util.UUID;
   4
   5 import org.argeo.security.SystemAuthentication;
   6 import org.osgi.framework.BundleActivator;
   7 import org.osgi.framework.BundleContext;
   8
   9 /**
  10  * Activates the {@link Kernel} from the provided {@link BundleContext}. Gives
  11  * access to kernel information for the rest of the bundle (and only it)
  12  */
  13 public class Activator implements BundleActivator {
  14         private final static String systemKey;
  15         static {
  16                 systemKey = UUID.randomUUID().toString();
  17                 System.setProperty(SystemAuthentication.SYSTEM_KEY_PROPERTY, systemKey);
  18         }
  19
  20         private static BundleContext bundleContext;
  21         private Kernel kernel;
  22
  23         @Override
  24         public void start(BundleContext context) throws Exception {
  25                 assert bundleContext == null;
  26                 assert kernel == null;
  27
  28                 bundleContext = context;
  29                 kernel = new Kernel(bundleContext);
  30                 kernel.init();
  31         }
  32
  33         @Override
  34         public void stop(BundleContext context) throws Exception {
  35                 kernel.destroy();
  36                 kernel = null;
  37                 bundleContext = null;
  38         }
  39
  40         /**
  41          * Singleton interface to the {@link BundleContext} related to the calling
  42          * thread.
  43          *
  44          * @BundleScope
  45          */
  46         public static BundleContext getBundleContext() {
  47                 return bundleContext;
  48         }
  49
  50         /**
  51          * @return a String which is guaranteed to be unique between and constant
  52          *         within a Java static context (typically a VM launch)
  53          * @BundleScope
  54          */
  55         public final static String getSystemKey() {
  56                 return systemKey;
  57         }
  58 }