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
   9 package org.opendaylight.mdsal.dom.broker;
  10
  11 import static com.google.common.base.Preconditions.checkState;
  12 import static java.util.Objects.requireNonNull;
  13
  14 import com.google.common.annotations.VisibleForTesting;
  15 import com.google.common.collect.MutableClassToInstanceMap;
  16 import java.util.HashMap;
  17 import java.util.Map;
  18 import java.util.Optional;
  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.opendaylight.yangtools.yang.model.api.SchemaContext;
  30 import org.slf4j.Logger;
  31 import org.slf4j.LoggerFactory;
  32
  33 public class DOMMountPointServiceImpl implements DOMMountPointService {
  34     private static final Logger LOG = LoggerFactory.getLogger(DOMMountPointServiceImpl.class);
  35
  36     private final Map<YangInstanceIdentifier, DOMMountPoint> mountPoints = new HashMap<>();
  37
  38     private final ListenerRegistry<DOMMountPointListener> listeners = ListenerRegistry.create();
  39
  40     @Override
  41     public Optional<DOMMountPoint> getMountPoint(final YangInstanceIdentifier path) {
  42         return Optional.ofNullable(mountPoints.get(path));
  43     }
  44
  45     @Override
  46     public DOMMountPointBuilder createMountPoint(final YangInstanceIdentifier path) {
  47         checkState(!mountPoints.containsKey(path), "Mount point already exists");
  48         return new DOMMountPointBuilderImpl(path);
  49     }
  50
  51     @Override
  52     public ListenerRegistration<DOMMountPointListener> registerProvisionListener(final DOMMountPointListener listener) {
  53         return listeners.register(listener);
  54     }
  55
  56     private ObjectRegistration<DOMMountPoint> registerMountPoint(final SimpleDOMMountPoint mountPoint) {
  57         final YangInstanceIdentifier mountPointId = mountPoint.getIdentifier();
  58         synchronized (mountPoints) {
  59             final DOMMountPoint prev = mountPoints.putIfAbsent(mountPointId, mountPoint);
  60             checkState(prev == null, "Mount point %s already exists as %s", mountPointId, prev);
  61         }
  62         listeners.forEach(listener -> listener.getInstance().onMountPointCreated(mountPointId));
  63
  64         return new AbstractObjectRegistration<DOMMountPoint>(mountPoint) {
  65             @Override
  66             protected void removeRegistration() {
  67                 unregisterMountPoint(getInstance().getIdentifier());
  68             }
  69         };
  70     }
  71
  72     private void unregisterMountPoint(final YangInstanceIdentifier mountPointId) {
  73         synchronized (mountPoints) {
  74             if (mountPoints.remove(mountPointId) == null) {
  75                 LOG.warn("Removing non-existent mount point {} at", mountPointId, new Throwable());
  76                 return;
  77             }
  78         }
  79
  80         listeners.forEach(listener -> listener.getInstance().onMountPointRemoved(mountPointId));
  81     }
  82
  83     final class DOMMountPointBuilderImpl implements DOMMountPointBuilder {
  84
  85         private final MutableClassToInstanceMap<DOMService> services = MutableClassToInstanceMap.create();
  86         private final YangInstanceIdentifier path;
  87         private SchemaContext schemaContext;
  88
  89         private SimpleDOMMountPoint mountPoint;
  90
  91         DOMMountPointBuilderImpl(final YangInstanceIdentifier path) {
  92             this.path = requireNonNull(path);
  93         }
  94
  95         @VisibleForTesting
  96         SchemaContext getSchemaContext() {
  97             return schemaContext;
  98         }
  99
 100         @VisibleForTesting
 101         Map<Class<? extends DOMService>, DOMService> getServices() {
 102             return services;
 103         }
 104
 105         @Override
 106         public <T extends DOMService> DOMMountPointBuilder addService(final Class<T> type, final T impl) {
 107             services.putInstance(requireNonNull(type), requireNonNull(impl));
 108             return this;
 109         }
 110
 111         @Override
 112         public DOMMountPointBuilder addInitialSchemaContext(final SchemaContext ctx) {
 113             schemaContext = requireNonNull(ctx);
 114             return this;
 115         }
 116
 117         @Override
 118         public ObjectRegistration<DOMMountPoint> register() {
 119             checkState(mountPoint == null, "Mount point is already built.");
 120             mountPoint = SimpleDOMMountPoint.create(path, services,schemaContext);
 121             return registerMountPoint(mountPoint);
 122         }
 123     }
 124 }