opendaylight/md-sal/sal-dom-broker/src/main/java/org/opendaylight/controller/sal/dom/broker/BackwardsCompatibleMountPointManager.java

   1 /*
   2  * Copyright (c) 2014 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.sal.dom.broker;
   9
  10 import static com.google.common.base.Preconditions.checkState;
  11
  12 import com.google.common.base.Optional;
  13 import java.util.concurrent.ConcurrentHashMap;
  14 import java.util.concurrent.ConcurrentMap;
  15 import org.opendaylight.controller.md.sal.dom.api.DOMMountPoint;
  16 import org.opendaylight.controller.md.sal.dom.api.DOMMountPointService;
  17 import org.opendaylight.controller.sal.core.api.mount.MountProvisionInstance;
  18 import org.opendaylight.controller.sal.core.api.mount.MountProvisionListener;
  19 import org.opendaylight.controller.sal.core.api.mount.MountProvisionService;
  20 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  21 import org.opendaylight.yangtools.concepts.util.ListenerRegistry;
  22 import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier;
  23
  24 public class BackwardsCompatibleMountPointManager implements MountProvisionService, MountProvisionListener {
  25
  26     private final ListenerRegistry<MountProvisionListener> listeners = ListenerRegistry.create();
  27     private final ConcurrentMap<InstanceIdentifier, MountProvisionInstance> mounts = new ConcurrentHashMap<>();
  28
  29     private final DOMMountPointService domMountPointService;
  30
  31     public BackwardsCompatibleMountPointManager(final DOMMountPointService domMountPointService) {
  32         this.domMountPointService = domMountPointService;
  33     }
  34
  35     @Override
  36     public MountProvisionInstance createMountPoint(final InstanceIdentifier path) {
  37         checkState(!mounts.containsKey(path), "Mount already created");
  38         // Create mount point instance, wrap instance of new API with BackwardsCompatibleMountPoint to preserve backwards comatibility
  39         final BackwardsCompatibleMountPoint mount = new BackwardsCompatibleMountPoint(path, domMountPointService.createMountPoint(path));
  40         mounts.put(path, mount);
  41         return mount;
  42     }
  43
  44     public void notifyMountCreated(final InstanceIdentifier identifier) {
  45         for (final ListenerRegistration<MountProvisionListener> listener : listeners.getListeners()) {
  46             listener.getInstance().onMountPointCreated(identifier);
  47         }
  48     }
  49
  50     public void notifyMountRemoved(final InstanceIdentifier identifier) {
  51         for (final ListenerRegistration<MountProvisionListener> listener : listeners.getListeners()) {
  52             listener.getInstance().onMountPointRemoved(identifier);
  53         }
  54     }
  55
  56     @Override
  57     public MountProvisionInstance createOrGetMountPoint(
  58             final InstanceIdentifier path) {
  59         final MountProvisionInstance mount = getMountPoint(path);
  60         if (mount == null) {
  61             return createMountPoint(path);
  62         }
  63         return mount;
  64     }
  65
  66     @Override
  67     public MountProvisionInstance getMountPoint(final InstanceIdentifier path) {
  68         // If the mount point was created here, return directly
  69         if(mounts.containsKey(path)) {
  70             return mounts.get(path);
  71         }
  72
  73         // If mount was created in underlying DOMMountService, wrap as MountProvisionInstance
  74         final Optional<DOMMountPoint> mount = domMountPointService.getMountPoint(path);
  75         if(mount.isPresent()) {
  76             return new BackwardsCompatibleMountPoint(path, mount.get());
  77         } else {
  78             return null;
  79         }
  80     }
  81
  82     @Override
  83     public ListenerRegistration<MountProvisionListener> registerProvisionListener(
  84             final MountProvisionListener listener) {
  85         return domMountPointService.registerProvisionListener(listener);
  86     }
  87
  88     @Override
  89     public void onMountPointCreated(final InstanceIdentifier path) {
  90         notifyMountCreated(path);
  91     }
  92
  93     @Override
  94     public void onMountPointRemoved(final InstanceIdentifier path) {
  95             notifyMountRemoved(path);
  96     }
  97 }