dom/mdsal-dom-broker/src/main/java/org/opendaylight/mdsal/dom/broker/DOMMountPointServiceImpl.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.mdsal.dom.broker;
   9
  10 import static java.util.Objects.requireNonNull;
  11
  12 import com.google.common.collect.MutableClassToInstanceMap;
  13 import java.util.HashMap;
  14 import java.util.Map;
  15 import java.util.Optional;
  16 import javax.inject.Inject;
  17 import javax.inject.Singleton;
  18 import org.kohsuke.MetaInfServices;
  19 import org.opendaylight.mdsal.dom.api.DOMMountPoint;
  20 import org.opendaylight.mdsal.dom.api.DOMMountPointListener;
  21 import org.opendaylight.mdsal.dom.api.DOMMountPointService;
  22 import org.opendaylight.mdsal.dom.api.DOMService;
  23 import org.opendaylight.mdsal.dom.spi.SimpleDOMMountPoint;
  24 import org.opendaylight.yangtools.concepts.AbstractObjectRegistration;
  25 import org.opendaylight.yangtools.concepts.ObjectRegistration;
  26 import org.opendaylight.yangtools.concepts.Registration;
  27 import org.opendaylight.yangtools.util.ObjectRegistry;
  28 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  29 import org.osgi.service.component.annotations.Activate;
  30 import org.osgi.service.component.annotations.Component;
  31 import org.slf4j.Logger;
  32 import org.slf4j.LoggerFactory;
  33
  34 @Component
  35 @MetaInfServices
  36 @Singleton
  37 public final class DOMMountPointServiceImpl implements DOMMountPointService {
  38     private static final Logger LOG = LoggerFactory.getLogger(DOMMountPointServiceImpl.class);
  39
  40     private final Map<YangInstanceIdentifier, DOMMountPoint> mountPoints = new HashMap<>();
  41     private final ObjectRegistry<DOMMountPointListener> listeners =
  42         ObjectRegistry.createConcurrent("mount point listeners");
  43
  44     @Inject
  45     @Activate
  46     public DOMMountPointServiceImpl() {
  47         // Exposed only for DI
  48     }
  49
  50     @Override
  51     public Optional<DOMMountPoint> getMountPoint(final YangInstanceIdentifier path) {
  52         return Optional.ofNullable(mountPoints.get(path));
  53     }
  54
  55     @Override
  56     public synchronized DOMMountPointBuilder createMountPoint(final YangInstanceIdentifier path) {
  57         checkNotExists(path, mountPoints.get(requireNonNull(path)));
  58         return new DOMMountPointBuilderImpl(path);
  59     }
  60
  61     @Override
  62     public Registration registerProvisionListener(final DOMMountPointListener listener) {
  63         return listeners.register(listener);
  64     }
  65
  66     @SuppressWarnings("checkstyle:IllegalCatch")
  67     private ObjectRegistration<DOMMountPoint> registerMountPoint(final SimpleDOMMountPoint mountPoint) {
  68         final YangInstanceIdentifier mountPointId = mountPoint.getIdentifier();
  69         synchronized (mountPoints) {
  70             checkNotExists(mountPointId, mountPoints.putIfAbsent(mountPointId, mountPoint));
  71         }
  72         listeners.streamObjects().forEach(listener -> {
  73             try {
  74                 listener.onMountPointCreated(mountPointId);
  75             } catch (final Exception ex) {
  76                 LOG.error("Listener {} failed on mount point {} created event", listener, mountPoint, ex);
  77             }
  78         });
  79
  80         return new AbstractObjectRegistration<>(mountPoint) {
  81             @Override
  82             protected void removeRegistration() {
  83                 unregisterMountPoint(getInstance().getIdentifier());
  84             }
  85         };
  86     }
  87
  88     @SuppressWarnings("checkstyle:IllegalCatch")
  89     private void unregisterMountPoint(final YangInstanceIdentifier mountPointId) {
  90         synchronized (mountPoints) {
  91             if (mountPoints.remove(mountPointId) == null) {
  92                 LOG.warn("Removing non-existent mount point {} at", mountPointId, new Throwable());
  93                 return;
  94             }
  95         }
  96
  97         listeners.streamObjects().forEach(listener -> {
  98             try {
  99                 listener.onMountPointRemoved(mountPointId);
 100             } catch (final Exception ex) {
 101                 LOG.error("Listener {} failed on mount point {} removed event", listener, mountPointId, ex);
 102             }
 103         });
 104     }
 105
 106     private static void checkNotExists(final YangInstanceIdentifier id, final DOMMountPoint mountPoint) {
 107         if (mountPoint != null) {
 108             throw new IllegalStateException("Mount point " + id + " already exists as " + mountPoint);
 109         }
 110     }
 111
 112     private final class DOMMountPointBuilderImpl implements DOMMountPointBuilder {
 113         private final MutableClassToInstanceMap<DOMService<?, ?>> services = MutableClassToInstanceMap.create();
 114         private final YangInstanceIdentifier path;
 115
 116         private SimpleDOMMountPoint mountPoint;
 117
 118         DOMMountPointBuilderImpl(final YangInstanceIdentifier path) {
 119             this.path = requireNonNull(path);
 120         }
 121
 122         @Override
 123         public <T extends DOMService<T, E>, E extends DOMService.Extension<T, E>> DOMMountPointBuilder addService(
 124                 final Class<T> type, final T impl) {
 125             services.putInstance(type, requireNonNull(impl));
 126             return this;
 127         }
 128
 129         @Override
 130         public ObjectRegistration<DOMMountPoint> register() {
 131             if (mountPoint != null) {
 132                 throw new IllegalStateException("Mount point is already built");
 133             }
 134             mountPoint = SimpleDOMMountPoint.create(path, services);
 135             return registerMountPoint(mountPoint);
 136         }
 137     }
 138 }