org.argeo.cms/src/org/argeo/cms/internal/kernel/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                 bundleContext = context;
  28                 kernel = new Kernel();
  29                 kernel.init();
  30         }
  31
  32         @Override
  33         public void stop(BundleContext context) throws Exception {
  34                 kernel.destroy();
  35                 kernel = null;
  36                 bundleContext = null;
  37         }
  38
  39         /**
  40          * Singleton interface to the {@link BundleContext} related to the calling
  41          * thread.
  42          *
  43          * @BundleScope
  44          */
  45         public static BundleContext getBundleContext() {
  46                 return bundleContext;
  47         }
  48
  49         /**
  50          * @return a String which is guaranteed to be unique between and constant
  51          *         within a Java static context (typically a VM launch)
  52          * @BundleScope
  53          */
  54         public final static String getSystemKey() {
  55                 return systemKey;
  56         }
  57 }