Class OsgiRegistry

All Implemented Interfaces:
EventListener, org.osgi.framework.BundleListener, org.osgi.framework.SynchronousBundleListener

public final class OsgiRegistry extends Object implements org.osgi.framework.SynchronousBundleListener
Utility class to deal with OSGi runtime specific behavior. This is mainly to handle META-INF/services lookup and generic/application class lookup issue in OSGi. When OSGi runtime is detected by the ServiceFinder class, an instance of OsgiRegistry is created and associated with given OSGi BundleContext. META-INF/services entries are then being accessed via the OSGi Bundle API as direct ClassLoader#getResource() method invocation does not work in this case within OSGi.
Jakub Podlesak, Adam Lindenthal
  • Method Details

    • getInstance

      public static OsgiRegistry getInstance()
      Returns an OsgiRegistry instance. Call this method only if sure that the application is running in OSGi environment, otherwise a call to this method can lead to an ClassNotFoundException.
      an OsgiRegistry instance.
    • bundleChanged

      public void bundleChanged(org.osgi.framework.BundleEvent event)
      Specified by:
      bundleChanged in interface org.osgi.framework.BundleListener
    • bundleEntryPathToClassName

      public static String bundleEntryPathToClassName(String packagePath, String bundleEntryPath)
      Translates bundle entry path as returned from Bundle.findEntries(String, String, boolean) to fully qualified class name that resides in given package path (directly or indirectly in its subpackages).
      packagePath - The package path where the class is located (even recursively)
      bundleEntryPath - The bundle path to translate.
      Fully qualified class name.
    • isPackageLevelEntry

      public static boolean isPackageLevelEntry(String packagePath, String entryPath)
      Returns whether the given entry path is located directly in the provided package path. That is, if the entry is located in a sub-package, then false is returned.
      packagePath - Package path which the entry is compared to
      entryPath - Entry path
      Whether the given entry path is located directly in the provided package path.
    • normalizedPackagePath

      public static String normalizedPackagePath(String packagePath)
      Normalized package returns path that does not start with '/' character and ends with '/' character. If the argument is '/' then returned value is empty string "".
      packagePath - package path to normalize.
      Normalized package path.
    • getPackageResources

      public Enumeration<URL> getPackageResources(String packagePath, ClassLoader classLoader, boolean recursive)
      Get URLs of resources from a given package.
      packagePath - package.
      classLoader - resource class loader.
      recursive - whether the given package path should be scanned recursively by OSGi
      URLs of the located resources.
    • classForNameWithException

      public Class<?> classForNameWithException(String className) throws ClassNotFoundException
      Get the Class from the class name.

      The context class loader will be utilized if accessible and non-null. Otherwise the defining class loader of this class will be utilized.

      className - the class name.
      the Class, otherwise null if the class cannot be found.
      ClassNotFoundException - if the class cannot be found.
    • getResourceBundle

      public ResourceBundle getResourceBundle(String bundleName)
      Tries to load resource bundle via OSGi means. No caching involved here, as localization properties are being cached in Localizer class already.
      bundleName - name of the resource bundle to load
      resource bundle instance if found, null otherwise