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 com.google.common.base.Preconditions.checkState;
  11 import static java.util.Objects.requireNonNull;
  12
  13 import com.google.common.collect.MutableClassToInstanceMap;
  14 import java.util.HashMap;
  15 import java.util.Map;
  16 import java.util.Optional;
  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.ListenerRegistration;
  26 import org.opendaylight.yangtools.concepts.ObjectRegistration;
  27 import org.opendaylight.yangtools.util.ListenerRegistry;
  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.osgi.service.component.annotations.Deactivate;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34
  35 @Component(immediate = true)
  36 @MetaInfServices
  37 @Singleton
  38 public final class DOMMountPointServiceImpl implements DOMMountPointService {
  39     private static final Logger LOG = LoggerFactory.getLogger(DOMMountPointServiceImpl.class);
  40
  41     private final Map<YangInstanceIdentifier, DOMMountPoint> mountPoints = new HashMap<>();
  42
  43     private final ListenerRegistry<DOMMountPointListener> listeners = ListenerRegistry.create();
  44
  45     @Override
  46     public Optional<DOMMountPoint> getMountPoint(final YangInstanceIdentifier path) {
  47         return Optional.ofNullable(mountPoints.get(path));
  48     }
  49
  50     @Override
  51     public DOMMountPointBuilder createMountPoint(final YangInstanceIdentifier path) {
  52         checkState(!mountPoints.containsKey(path), "Mount point already exists");
  53         return new DOMMountPointBuilderImpl(path);
  54     }
  55
  56     @Override
  57     public ListenerRegistration<DOMMountPointListener> registerProvisionListener(final DOMMountPointListener listener) {
  58         return listeners.register(listener);
  59     }
  60
  61     @Activate
  62     @SuppressWarnings("static-method")
  63     void activate() {
  64         LOG.info("DOMMountPointService activated");
  65     }
  66
  67     @Deactivate
  68     @SuppressWarnings("static-method")
  69     void deactivate() {
  70         LOG.info("DOMMountPointService deactivated");
  71     }
  72
  73     @SuppressWarnings("checkstyle:IllegalCatch")
  74     private ObjectRegistration<DOMMountPoint> registerMountPoint(final SimpleDOMMountPoint mountPoint) {
  75         final YangInstanceIdentifier mountPointId = mountPoint.getIdentifier();
  76         synchronized (mountPoints) {
  77             final DOMMountPoint prev = mountPoints.putIfAbsent(mountPointId, mountPoint);
  78             checkState(prev == null, "Mount point %s already exists as %s", mountPointId, prev);
  79         }
  80         listeners.streamListeners().forEach(listener -> {
  81             try {
  82                 listener.onMountPointCreated(mountPointId);
  83             } catch (final Exception ex) {
  84                 LOG.error("Listener {} failed on mount point {} created event", listener, mountPoint, ex);
  85             }
  86         });
  87
  88         return new AbstractObjectRegistration<>(mountPoint) {
  89             @Override
  90             protected void removeRegistration() {
  91                 unregisterMountPoint(getInstance().getIdentifier());
  92             }
  93         };
  94     }
  95
  96     @SuppressWarnings("checkstyle:IllegalCatch")
  97     private void unregisterMountPoint(final YangInstanceIdentifier mountPointId) {
  98         synchronized (mountPoints) {
  99             if (mountPoints.remove(mountPointId) == null) {
 100                 LOG.warn("Removing non-existent mount point {} at", mountPointId, new Throwable());
 101                 return;
 102             }
 103         }
 104
 105         listeners.streamListeners().forEach(listener -> {
 106             try {
 107                 listener.onMountPointRemoved(mountPointId);
 108             } catch (final Exception ex) {
 109                 LOG.error("Listener {} failed on mount point {} removed event", listener, mountPointId, ex);
 110             }
 111         });
 112     }
 113
 114     private final class DOMMountPointBuilderImpl implements DOMMountPointBuilder {
 115
 116         private final MutableClassToInstanceMap<DOMService> services = MutableClassToInstanceMap.create();
 117         private final YangInstanceIdentifier path;
 118
 119         private SimpleDOMMountPoint mountPoint;
 120
 121         DOMMountPointBuilderImpl(final YangInstanceIdentifier path) {
 122             this.path = requireNonNull(path);
 123         }
 124
 125         @Override
 126         public <T extends DOMService> DOMMountPointBuilder addService(final Class<T> type, final T impl) {
 127             services.putInstance(requireNonNull(type), requireNonNull(impl));
 128             return this;
 129         }
 130
 131         @Override
 132         public ObjectRegistration<DOMMountPoint> register() {
 133             checkState(mountPoint == null, "Mount point is already built.");
 134             mountPoint = SimpleDOMMountPoint.create(path, services);
 135             return registerMountPoint(mountPoint);
 136         }
 137     }
 138 }