opendaylight/config/config-manager/src/main/java/org/opendaylight/controller/config/manager/impl/osgi/BundleContextBackedModuleFactoriesResolver.java

   1 /*
   2  * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.controller.config.manager.impl.osgi;
   9
  10 import java.util.ArrayList;
  11 import java.util.Collection;
  12 import java.util.List;
  13
  14 import org.opendaylight.controller.config.manager.impl.factoriesresolver.ModuleFactoriesResolver;
  15 import org.opendaylight.controller.config.spi.ModuleFactory;
  16 import org.osgi.framework.BundleContext;
  17 import org.osgi.framework.InvalidSyntaxException;
  18 import org.osgi.framework.ServiceReference;
  19
  20 /**
  21  * Retrieves list of currently registered Module Factories using bundlecontext.
  22  */
  23 public class BundleContextBackedModuleFactoriesResolver implements
  24         ModuleFactoriesResolver {
  25     private final BundleContext bundleContext;
  26
  27     public BundleContextBackedModuleFactoriesResolver(
  28             BundleContext bundleContext) {
  29         this.bundleContext = bundleContext;
  30     }
  31
  32     @Override
  33     public List<? extends ModuleFactory> getAllFactories() {
  34         Collection<ServiceReference<ModuleFactory>> serviceReferences;
  35         try {
  36             serviceReferences = bundleContext.getServiceReferences(
  37                     ModuleFactory.class, null);
  38         } catch (InvalidSyntaxException e) {
  39             throw new IllegalStateException(e);
  40         }
  41         List<ModuleFactory> result = new ArrayList<>(serviceReferences.size());
  42         for (ServiceReference<ModuleFactory> serviceReference : serviceReferences) {
  43             ModuleFactory service = bundleContext.getService(serviceReference);
  44             // null if the service is not registered, the service object
  45             // returned by a ServiceFactory does not
  46             // implement the classes under which it was registered or the
  47             // ServiceFactory threw an exception.
  48             if (service != null) {
  49                 result.add(service);
  50             }
  51         }
  52         return result;
  53     }
  54 }