dom/mdsal-dom-schema-osgi/src/main/java/org/opendaylight/mdsal/dom/schema/osgi/impl/RegularYangModuleInfoRegistry.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.collect.ImmutableList;
  13 import java.util.List;
  14 import java.util.NoSuchElementException;
  15 import org.checkerframework.checker.lock.qual.GuardedBy;
  16 import org.checkerframework.checker.lock.qual.Holding;
  17 import org.eclipse.jdt.annotation.NonNull;
  18 import org.opendaylight.mdsal.binding.runtime.api.ModuleInfoSnapshot;
  19 import org.opendaylight.mdsal.binding.runtime.spi.ModuleInfoSnapshotResolver;
  20 import org.opendaylight.yangtools.concepts.AbstractRegistration;
  21 import org.opendaylight.yangtools.concepts.Registration;
  22 import org.opendaylight.yangtools.yang.binding.DataRoot;
  23 import org.opendaylight.yangtools.yang.binding.YangFeatureProvider;
  24 import org.opendaylight.yangtools.yang.binding.YangModuleInfo;
  25 import org.opendaylight.yangtools.yang.parser.api.YangParserFactory;
  26 import org.osgi.service.component.ComponentFactory;
  27 import org.osgi.service.component.ComponentInstance;
  28 import org.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30
  31 /**
  32  * Update SchemaContext service in Service Registry each time new YangModuleInfo is added or removed.
  33  */
  34 final class RegularYangModuleInfoRegistry extends YangModuleInfoRegistry {
  35     private static final Logger LOG = LoggerFactory.getLogger(RegularYangModuleInfoRegistry.class);
  36
  37     private final ComponentFactory<OSGiModuleInfoSnapshotImpl> contextFactory;
  38     private final ModuleInfoSnapshotResolver resolver;
  39
  40     @GuardedBy("this")
  41     private ComponentInstance<OSGiModuleInfoSnapshotImpl> currentInstance;
  42     @GuardedBy("this")
  43     private ModuleInfoSnapshot currentSnapshot;
  44     @GuardedBy("this")
  45     private int generation;
  46
  47     private volatile boolean ignoreScanner = true;
  48
  49     RegularYangModuleInfoRegistry(final ComponentFactory<OSGiModuleInfoSnapshotImpl> contextFactory,
  50             final YangParserFactory factory) {
  51         this.contextFactory = requireNonNull(contextFactory);
  52         resolver = new ModuleInfoSnapshotResolver("dom-schema-osgi", factory);
  53     }
  54
  55     // Invocation from scanner, we may want to ignore this in order to not process partial updates
  56     @Override
  57     void scannerUpdate() {
  58         if (!ignoreScanner) {
  59             synchronized (this) {
  60                 updateService();
  61             }
  62         }
  63     }
  64
  65     @Override
  66     synchronized void scannerShutdown() {
  67         ignoreScanner = true;
  68     }
  69
  70     @Override
  71     synchronized void enableScannerAndUpdate() {
  72         ignoreScanner = false;
  73         updateService();
  74     }
  75
  76     @Override
  77     synchronized void close() {
  78         ignoreScanner = true;
  79         if (currentInstance != null) {
  80             currentInstance.dispose();
  81             currentInstance = null;
  82         }
  83     }
  84
  85     @Override
  86     Registration registerBundle(final List<YangModuleInfo> moduleInfos,
  87             final List<YangFeatureProvider<?>> featureProviders) {
  88         final var infoRegs = resolver.registerModuleInfos(moduleInfos);
  89         final var featureRegs = featureProviders.stream()
  90             .map(provider -> {
  91                 @SuppressWarnings("unchecked")
  92                 final var raw = (YangFeatureProvider<@NonNull DataRoot>) provider;
  93                 return resolver.registerModuleFeatures(raw.boundModule(), raw.supportedFeatures());
  94             })
  95             .collect(ImmutableList.toImmutableList());
  96
  97         return new AbstractRegistration() {
  98             @Override
  99             protected void removeRegistration() {
 100                 featureRegs.forEach(Registration::close);
 101                 infoRegs.forEach(Registration::close);
 102             }
 103         };
 104     }
 105
 106     @Holding("this")
 107     private void updateService() {
 108         final ModuleInfoSnapshot newSnapshot;
 109         try {
 110             newSnapshot = resolver.takeSnapshot();
 111         } catch (NoSuchElementException e) {
 112             LOG.debug("No snapshot available", e);
 113             return;
 114         }
 115         if (newSnapshot.equals(currentSnapshot)) {
 116             LOG.debug("No update to snapshot");
 117             return;
 118         }
 119
 120         final ComponentInstance<OSGiModuleInfoSnapshotImpl> newInstance = contextFactory.newInstance(
 121             OSGiModuleInfoSnapshotImpl.props(nextGeneration(), newSnapshot));
 122         if (currentInstance != null) {
 123             currentInstance.dispose();
 124         }
 125         currentInstance = newInstance;
 126         currentSnapshot = newSnapshot;
 127     }
 128
 129     @Holding("this")
 130     private long nextGeneration() {
 131         return generation == -1 ? -1 : ++generation;
 132     }
 133 }