yang/yang-parser-impl/src/main/java/org/opendaylight/yangtools/yang/parser/repo/SharedSchemaContextFactory.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.yangtools.yang.parser.repo;
   9
  10 import static com.google.common.base.Preconditions.checkArgument;
  11 import static java.util.Objects.requireNonNull;
  12 import static org.opendaylight.yangtools.util.concurrent.FluentFutures.immediateFluentFuture;
  13
  14 import com.google.common.base.Function;
  15 import com.google.common.cache.Cache;
  16 import com.google.common.cache.CacheBuilder;
  17 import com.google.common.collect.Collections2;
  18 import com.google.common.collect.ImmutableList;
  19 import com.google.common.collect.Iterables;
  20 import com.google.common.collect.Maps;
  21 import com.google.common.util.concurrent.AsyncFunction;
  22 import com.google.common.util.concurrent.FluentFuture;
  23 import com.google.common.util.concurrent.FutureCallback;
  24 import com.google.common.util.concurrent.Futures;
  25 import com.google.common.util.concurrent.ListenableFuture;
  26 import com.google.common.util.concurrent.MoreExecutors;
  27 import com.google.common.util.concurrent.SettableFuture;
  28 import java.util.Collection;
  29 import java.util.LinkedHashMap;
  30 import java.util.LinkedHashSet;
  31 import java.util.List;
  32 import java.util.Map;
  33 import java.util.Map.Entry;
  34 import java.util.Set;
  35 import java.util.concurrent.ExecutionException;
  36 import org.antlr.v4.runtime.ParserRuleContext;
  37 import org.eclipse.jdt.annotation.NonNull;
  38 import org.gaul.modernizer_maven_annotations.SuppressModernizer;
  39 import org.opendaylight.yangtools.antlrv4.code.gen.YangStatementParser.StatementContext;
  40 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  41 import org.opendaylight.yangtools.yang.model.repo.api.EffectiveModelContextFactory;
  42 import org.opendaylight.yangtools.yang.model.repo.api.SchemaContextFactoryConfiguration;
  43 import org.opendaylight.yangtools.yang.model.repo.api.SchemaRepository;
  44 import org.opendaylight.yangtools.yang.model.repo.api.SchemaResolutionException;
  45 import org.opendaylight.yangtools.yang.model.repo.api.SourceIdentifier;
  46 import org.opendaylight.yangtools.yang.model.repo.api.StatementParserMode;
  47 import org.opendaylight.yangtools.yang.parser.impl.DefaultReactors;
  48 import org.opendaylight.yangtools.yang.parser.rfc7950.repo.ASTSchemaSource;
  49 import org.opendaylight.yangtools.yang.parser.rfc7950.repo.YangModelDependencyInfo;
  50 import org.opendaylight.yangtools.yang.parser.rfc7950.repo.YangStatementStreamSource;
  51 import org.opendaylight.yangtools.yang.parser.spi.meta.ReactorException;
  52 import org.opendaylight.yangtools.yang.parser.stmt.reactor.CrossSourceStatementReactor.BuildAction;
  53 import org.slf4j.Logger;
  54 import org.slf4j.LoggerFactory;
  55
  56 final class SharedSchemaContextFactory implements EffectiveModelContextFactory {
  57     private static final Logger LOG = LoggerFactory.getLogger(SharedSchemaContextFactory.class);
  58
  59     private final Cache<Collection<SourceIdentifier>, EffectiveModelContext> revisionCache = CacheBuilder.newBuilder()
  60             .weakValues().build();
  61     private final Cache<Collection<SourceIdentifier>, EffectiveModelContext> semVerCache = CacheBuilder.newBuilder()
  62             .weakValues().build();
  63     private final @NonNull SchemaRepository repository;
  64     private final @NonNull SchemaContextFactoryConfiguration config;
  65
  66     SharedSchemaContextFactory(final @NonNull SchemaRepository repository,
  67         final @NonNull SchemaContextFactoryConfiguration config) {
  68         this.repository = requireNonNull(repository);
  69         this.config = requireNonNull(config);
  70     }
  71
  72     @Override
  73     public @NonNull ListenableFuture<EffectiveModelContext> createEffectiveModelContext(
  74             final @NonNull Collection<SourceIdentifier> requiredSources) {
  75         return createSchemaContext(requiredSources,
  76                 config.getStatementParserMode() == StatementParserMode.SEMVER_MODE ? semVerCache : revisionCache,
  77                 new AssembleSources(config));
  78     }
  79
  80     private @NonNull ListenableFuture<EffectiveModelContext> createSchemaContext(
  81             final Collection<SourceIdentifier> requiredSources,
  82             final Cache<Collection<SourceIdentifier>, EffectiveModelContext> cache,
  83             final AsyncFunction<List<ASTSchemaSource>, EffectiveModelContext> assembleSources) {
  84         // Make sources unique
  85         final List<SourceIdentifier> uniqueSourceIdentifiers = deDuplicateSources(requiredSources);
  86
  87         final EffectiveModelContext existing = cache.getIfPresent(uniqueSourceIdentifiers);
  88         if (existing != null) {
  89             LOG.debug("Returning cached context {}", existing);
  90             return immediateFluentFuture(existing);
  91         }
  92
  93         // Request all sources be loaded
  94         ListenableFuture<List<ASTSchemaSource>> sf = Futures.allAsList(Collections2.transform(uniqueSourceIdentifiers,
  95             this::requestSource));
  96
  97         // Detect mismatch between requested Source IDs and IDs that are extracted from parsed source
  98         // Also remove duplicates if present
  99         // We are relying on preserved order of uniqueSourceIdentifiers as well as sf
 100         sf = Futures.transform(sf, new SourceIdMismatchDetector(uniqueSourceIdentifiers),
 101             MoreExecutors.directExecutor());
 102
 103         // Assemble sources into a schema context
 104         final ListenableFuture<EffectiveModelContext> cf = Futures.transformAsync(sf, assembleSources,
 105             MoreExecutors.directExecutor());
 106
 107         final SettableFuture<EffectiveModelContext> rf = SettableFuture.create();
 108         Futures.addCallback(cf, new FutureCallback<EffectiveModelContext>() {
 109             @Override
 110             public void onSuccess(final EffectiveModelContext result) {
 111                 // Deduplicate concurrent loads
 112                 final EffectiveModelContext existing;
 113                 try {
 114                     existing = cache.get(uniqueSourceIdentifiers, () -> result);
 115                 } catch (ExecutionException e) {
 116                     LOG.warn("Failed to recheck result with cache, will use computed value", e);
 117                     rf.set(result);
 118                     return;
 119                 }
 120
 121                 rf.set(existing);
 122             }
 123
 124             @Override
 125             public void onFailure(final Throwable cause) {
 126                 LOG.debug("Failed to assemble sources", cause);
 127                 rf.setException(cause);
 128             }
 129         }, MoreExecutors.directExecutor());
 130
 131         return rf;
 132     }
 133
 134     private ListenableFuture<ASTSchemaSource> requestSource(final @NonNull SourceIdentifier identifier) {
 135         return repository.getSchemaSource(identifier, ASTSchemaSource.class);
 136     }
 137
 138     /**
 139      * Return a set of de-duplicated inputs.
 140      *
 141      * @return set (preserving ordering) from the input collection
 142      */
 143     private static List<SourceIdentifier> deDuplicateSources(final Collection<SourceIdentifier> requiredSources) {
 144         final Set<SourceIdentifier> uniqueSourceIdentifiers = new LinkedHashSet<>(requiredSources);
 145         if (uniqueSourceIdentifiers.size() == requiredSources.size()) {
 146             // Can potentially reuse input
 147             return ImmutableList.copyOf(requiredSources);
 148         }
 149
 150         LOG.warn("Duplicate sources requested for schema context, removed duplicate sources: {}",
 151             Collections2.filter(uniqueSourceIdentifiers, input -> Iterables.frequency(requiredSources, input) > 1));
 152         return ImmutableList.copyOf(uniqueSourceIdentifiers);
 153     }
 154
 155     @SuppressModernizer
 156     private static final class SourceIdMismatchDetector implements Function<List<ASTSchemaSource>,
 157             List<ASTSchemaSource>> {
 158         private final List<SourceIdentifier> sourceIdentifiers;
 159
 160         SourceIdMismatchDetector(final List<SourceIdentifier> sourceIdentifiers) {
 161             this.sourceIdentifiers = requireNonNull(sourceIdentifiers);
 162         }
 163
 164         @Override
 165         public List<ASTSchemaSource> apply(final List<ASTSchemaSource> input) {
 166             final Map<SourceIdentifier, ASTSchemaSource> filtered = new LinkedHashMap<>();
 167
 168             for (int i = 0; i < input.size(); i++) {
 169
 170                 final SourceIdentifier expectedSId = sourceIdentifiers.get(i);
 171                 final ASTSchemaSource astSchemaSource = input.get(i);
 172                 final SourceIdentifier realSId = astSchemaSource.getIdentifier();
 173
 174                 if (!expectedSId.equals(realSId)) {
 175                     LOG.warn("Source identifier mismatch for module \"{}\", requested as {} but actually is {}. "
 176                         + "Using actual id", expectedSId.getName(), expectedSId, realSId);
 177                 }
 178
 179                 if (filtered.containsKey(realSId)) {
 180                     LOG.warn("Duplicate source for module {} detected in reactor", realSId);
 181                 }
 182
 183                 filtered.put(realSId, astSchemaSource);
 184
 185             }
 186             return ImmutableList.copyOf(filtered.values());
 187         }
 188     }
 189
 190     private static final class AssembleSources implements AsyncFunction<List<ASTSchemaSource>, EffectiveModelContext> {
 191         private final @NonNull SchemaContextFactoryConfiguration config;
 192         private final @NonNull Function<ASTSchemaSource, SourceIdentifier> getIdentifier;
 193
 194         private AssembleSources(final @NonNull SchemaContextFactoryConfiguration config) {
 195             this.config = config;
 196             switch (config.getStatementParserMode()) {
 197                 case SEMVER_MODE:
 198                     this.getIdentifier = ASTSchemaSource::getSemVerIdentifier;
 199                     break;
 200                 default:
 201                     this.getIdentifier = ASTSchemaSource::getIdentifier;
 202             }
 203         }
 204
 205         @Override
 206         public FluentFuture<EffectiveModelContext> apply(final List<ASTSchemaSource> sources)
 207                 throws SchemaResolutionException, ReactorException {
 208             final Map<SourceIdentifier, ASTSchemaSource> srcs = Maps.uniqueIndex(sources, getIdentifier);
 209             final Map<SourceIdentifier, YangModelDependencyInfo> deps =
 210                     Maps.transformValues(srcs, ASTSchemaSource::getDependencyInformation);
 211
 212             LOG.debug("Resolving dependency reactor {}", deps);
 213
 214             final StatementParserMode statementParserMode = config.getStatementParserMode();
 215             final DependencyResolver res = statementParserMode == StatementParserMode.SEMVER_MODE
 216                     ? SemVerDependencyResolver.create(deps) : RevisionDependencyResolver.create(deps);
 217             if (!res.getUnresolvedSources().isEmpty()) {
 218                 LOG.debug("Omitting models {} due to unsatisfied imports {}", res.getUnresolvedSources(),
 219                     res.getUnsatisfiedImports());
 220                 throw new SchemaResolutionException("Failed to resolve required models",
 221                         res.getResolvedSources(), res.getUnsatisfiedImports());
 222             }
 223
 224             final BuildAction reactor = DefaultReactors.defaultReactor().newBuild(statementParserMode);
 225             config.getSupportedFeatures().ifPresent(reactor::setSupportedFeatures);
 226             config.getModulesDeviatedByModules().ifPresent(reactor::setModulesWithSupportedDeviations);
 227
 228             for (final Entry<SourceIdentifier, ASTSchemaSource> e : srcs.entrySet()) {
 229                 final ASTSchemaSource ast = e.getValue();
 230                 final ParserRuleContext parserRuleCtx = ast.getAST();
 231                 checkArgument(parserRuleCtx instanceof StatementContext, "Unsupported context class %s for source %s",
 232                     parserRuleCtx.getClass(), e.getKey());
 233
 234                 reactor.addSource(YangStatementStreamSource.create(e.getKey(), (StatementContext) parserRuleCtx,
 235                     ast.getSymbolicName().orElse(null)));
 236             }
 237
 238             final EffectiveModelContext schemaContext;
 239             try {
 240                 schemaContext = reactor.buildEffective();
 241             } catch (final ReactorException ex) {
 242                 throw new SchemaResolutionException("Failed to resolve required models", ex.getSourceIdentifier(), ex);
 243             }
 244
 245             return immediateFluentFuture(schemaContext);
 246         }
 247     }
 248 }