dom/mdsal-dom-schema-osgi/src/main/java/org/opendaylight/mdsal/dom/schema/osgi/impl/OSGiDOMSchemaService.java

   1 /*
   2  * Copyright (c) 2017, 2020 PANTHEON.tech, s.r.o. 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.schema.osgi.impl;
   9
  10 import static java.util.Objects.requireNonNull;
  11
  12 import com.google.common.util.concurrent.ListenableFuture;
  13 import java.util.List;
  14 import java.util.concurrent.CopyOnWriteArrayList;
  15 import org.eclipse.jdt.annotation.NonNull;
  16 import org.opendaylight.mdsal.binding.runtime.api.ModuleInfoSnapshot;
  17 import org.opendaylight.mdsal.dom.api.DOMSchemaService;
  18 import org.opendaylight.mdsal.dom.schema.osgi.OSGiModuleInfoSnapshot;
  19 import org.opendaylight.mdsal.dom.spi.AbstractDOMSchemaService;
  20 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  21 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  22 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContextListener;
  23 import org.opendaylight.yangtools.yang.model.repo.api.SourceIdentifier;
  24 import org.opendaylight.yangtools.yang.model.repo.api.YangTextSchemaSource;
  25 import org.osgi.service.component.ComponentFactory;
  26 import org.osgi.service.component.ComponentInstance;
  27 import org.osgi.service.component.annotations.Activate;
  28 import org.osgi.service.component.annotations.Component;
  29 import org.osgi.service.component.annotations.Deactivate;
  30 import org.osgi.service.component.annotations.FieldOption;
  31 import org.osgi.service.component.annotations.Reference;
  32 import org.osgi.service.component.annotations.ReferenceCardinality;
  33 import org.osgi.service.component.annotations.ReferencePolicy;
  34 import org.osgi.service.component.annotations.ReferencePolicyOption;
  35 import org.slf4j.Logger;
  36 import org.slf4j.LoggerFactory;
  37
  38 /**
  39  * OSGi Service Registry-backed implementation of {@link DOMSchemaService}.
  40  */
  41 @Component(service = DOMSchemaService.class, immediate = true)
  42 public final class OSGiDOMSchemaService extends AbstractDOMSchemaService.WithYangTextSources {
  43     private static final Logger LOG = LoggerFactory.getLogger(OSGiDOMSchemaService.class);
  44
  45     @Reference(target = "(component.factory=" + EffectiveModelContextImpl.FACTORY_NAME + ")")
  46     ComponentFactory listenerFactory = null;
  47
  48     private final List<EffectiveModelContextListener> listeners = new CopyOnWriteArrayList<>();
  49
  50     private volatile ModuleInfoSnapshot currentSnapshot;
  51
  52     @Override
  53     public EffectiveModelContext getGlobalContext() {
  54         return currentSnapshot.getEffectiveModelContext();
  55     }
  56
  57     @Override
  58     public ListenerRegistration<EffectiveModelContextListener> registerSchemaContextListener(
  59             final EffectiveModelContextListener listener) {
  60         return registerListener(requireNonNull(listener));
  61     }
  62
  63     @Override
  64     public ListenableFuture<? extends YangTextSchemaSource> getSource(final SourceIdentifier sourceIdentifier) {
  65         return currentSnapshot.getSource(sourceIdentifier);
  66     }
  67
  68     @Reference(fieldOption = FieldOption.REPLACE)
  69     void bindSnapshot(final OSGiModuleInfoSnapshot newContext) {
  70         LOG.trace("Updating context to generation {}", newContext.getGeneration());
  71         final ModuleInfoSnapshot snapshot = newContext.getService();
  72         final EffectiveModelContext ctx = snapshot.getEffectiveModelContext();
  73         currentSnapshot = snapshot;
  74         listeners.forEach(listener -> notifyListener(ctx, listener));
  75     }
  76
  77     @Reference(cardinality = ReferenceCardinality.MULTIPLE, policy = ReferencePolicy.DYNAMIC,
  78             policyOption = ReferencePolicyOption.GREEDY)
  79     void addListener(final EffectiveModelContextListener listener) {
  80         LOG.trace("Adding listener {}", listener);
  81         listeners.add(listener);
  82         listener.onModelContextUpdated(getGlobalContext());
  83     }
  84
  85     void removeListener(final EffectiveModelContextListener listener) {
  86         LOG.trace("Removing listener {}", listener);
  87         listeners.remove(listener);
  88     }
  89
  90     @Activate
  91     @SuppressWarnings("static-method")
  92     void activate() {
  93         LOG.info("DOM Schema services activated");
  94     }
  95
  96     @Deactivate
  97     @SuppressWarnings("static-method")
  98     void deactivate() {
  99         LOG.info("DOM Schema services deactivated");
 100     }
 101
 102     private @NonNull ListenerRegistration<EffectiveModelContextListener> registerListener(
 103             final @NonNull EffectiveModelContextListener listener) {
 104         final ComponentInstance reg = listenerFactory.newInstance(EffectiveModelContextImpl.props(listener));
 105         return new ListenerRegistration<>() {
 106             @Override
 107             public EffectiveModelContextListener getInstance() {
 108                 return listener;
 109             }
 110
 111             @Override
 112             public void close() {
 113                 reg.dispose();
 114             }
 115         };
 116     }
 117
 118     @SuppressWarnings("checkstyle:illegalCatch")
 119     private static void notifyListener(final EffectiveModelContext context,
 120             final EffectiveModelContextListener listener) {
 121         try {
 122             listener.onModelContextUpdated(context);
 123         } catch (RuntimeException e) {
 124             LOG.warn("Failed to notify listener {}", listener, e);
 125         }
 126     }
 127 }