yang/yang-parser-impl/src/main/java/org/opendaylight/yangtools/yang/parser/stmt/reactor/BuildGlobalContext.java

   1 /*
   2  * Copyright (c) 2015 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.stmt.reactor;
   9
  10 import com.google.common.base.Preconditions;
  11 import com.google.common.base.Throwables;
  12 import com.google.common.base.Verify;
  13 import com.google.common.collect.ImmutableList;
  14 import com.google.common.collect.Lists;
  15 import java.util.ArrayList;
  16 import java.util.Collection;
  17 import java.util.HashMap;
  18 import java.util.HashSet;
  19 import java.util.Iterator;
  20 import java.util.List;
  21 import java.util.Map;
  22 import java.util.Map.Entry;
  23 import java.util.Objects;
  24 import java.util.Set;
  25 import javax.annotation.Nonnull;
  26 import org.opendaylight.yangtools.yang.common.QName;
  27 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
  28 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
  29 import org.opendaylight.yangtools.yang.model.api.meta.IdentifierNamespace;
  30 import org.opendaylight.yangtools.yang.parser.spi.meta.DerivedNamespaceBehaviour;
  31 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelProcessingPhase;
  32 import org.opendaylight.yangtools.yang.parser.spi.meta.NamespaceBehaviour;
  33 import org.opendaylight.yangtools.yang.parser.spi.meta.NamespaceBehaviour.NamespaceStorageNode;
  34 import org.opendaylight.yangtools.yang.parser.spi.meta.NamespaceBehaviour.StorageNodeType;
  35 import org.opendaylight.yangtools.yang.parser.spi.meta.NamespaceNotAvailableException;
  36 import org.opendaylight.yangtools.yang.parser.spi.meta.ReactorException;
  37 import org.opendaylight.yangtools.yang.parser.spi.meta.SomeModifiersUnresolvedException;
  38 import org.opendaylight.yangtools.yang.parser.spi.meta.StatementSupport;
  39 import org.opendaylight.yangtools.yang.parser.spi.meta.StatementSupportBundle;
  40 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
  41 import org.opendaylight.yangtools.yang.parser.spi.source.StatementStreamSource;
  42 import org.opendaylight.yangtools.yang.parser.spi.validation.ValidationBundlesNamespace;
  43 import org.opendaylight.yangtools.yang.parser.spi.validation.ValidationBundlesNamespace.ValidationBundleType;
  44 import org.opendaylight.yangtools.yang.parser.stmt.reactor.SourceSpecificContext.PhaseCompletionProgress;
  45 import org.opendaylight.yangtools.yang.parser.stmt.rfc6020.effective.EffectiveSchemaContext;
  46 import org.slf4j.Logger;
  47 import org.slf4j.LoggerFactory;
  48
  49 class BuildGlobalContext extends NamespaceStorageSupport implements NamespaceBehaviour.Registry {
  50     private static final Logger LOG = LoggerFactory.getLogger(BuildGlobalContext.class);
  51
  52     private static final List<ModelProcessingPhase> PHASE_EXECUTION_ORDER = ImmutableList.<ModelProcessingPhase>builder()
  53             .add(ModelProcessingPhase.SOURCE_PRE_LINKAGE)
  54             .add(ModelProcessingPhase.SOURCE_LINKAGE)
  55             .add(ModelProcessingPhase.STATEMENT_DEFINITION)
  56             .add(ModelProcessingPhase.FULL_DECLARATION)
  57             .add(ModelProcessingPhase.EFFECTIVE_MODEL)
  58             .build();
  59
  60     private final Map<QName,StatementDefinitionContext<?,?,?>> definitions = new HashMap<>();
  61     private final Map<Class<?>,NamespaceBehaviourWithListeners<?, ?, ?>> supportedNamespaces = new HashMap<>();
  62
  63     private final Map<ModelProcessingPhase,StatementSupportBundle> supports;
  64     private final Set<SourceSpecificContext> sources = new HashSet<>();
  65
  66     private ModelProcessingPhase currentPhase = ModelProcessingPhase.INIT;
  67     private ModelProcessingPhase finishedPhase = ModelProcessingPhase.INIT;
  68
  69     public BuildGlobalContext(final Map<ModelProcessingPhase, StatementSupportBundle> supports) {
  70         super();
  71         this.supports = Preconditions.checkNotNull(supports, "BuildGlobalContext#supports cannot be null");
  72     }
  73
  74     public BuildGlobalContext(final Map<ModelProcessingPhase, StatementSupportBundle> supports, final Map<ValidationBundleType,Collection<?>> supportedValidation) {
  75         super();
  76         this.supports = Preconditions.checkNotNull(supports, "BuildGlobalContext#supports cannot be null");
  77
  78         for (Entry<ValidationBundleType, Collection<?>> validationBundle : supportedValidation.entrySet()) {
  79             addToNs(ValidationBundlesNamespace.class, validationBundle.getKey(), validationBundle.getValue());
  80         }
  81     }
  82
  83     public StatementSupportBundle getSupportsForPhase(final ModelProcessingPhase currentPhase) {
  84         return supports.get(currentPhase);
  85     }
  86
  87     public void addSource(@Nonnull final StatementStreamSource source) {
  88         sources.add(new SourceSpecificContext(this,source));
  89     }
  90
  91     @Override
  92     public StorageNodeType getStorageNodeType() {
  93         return StorageNodeType.GLOBAL;
  94     }
  95
  96     @Override
  97     public NamespaceStorageNode getParentNamespaceStorage() {
  98         return null;
  99     }
 100
 101     @Override
 102     public NamespaceBehaviour.Registry getBehaviourRegistry() {
 103         return this;
 104     }
 105
 106     @Override
 107     public <K, V, N extends IdentifierNamespace<K, V>> NamespaceBehaviourWithListeners<K, V, N> getNamespaceBehaviour(final Class<N> type) {
 108         NamespaceBehaviourWithListeners<?, ?, ?> potential = supportedNamespaces.get(type);
 109         if (potential == null) {
 110             NamespaceBehaviour<K, V, N> potentialRaw = supports.get(currentPhase).getNamespaceBehaviour(type);
 111             if (potentialRaw != null) {
 112                 potential = createNamespaceContext(potentialRaw);
 113                 supportedNamespaces.put(type, potential);
 114             } else {
 115                 throw new NamespaceNotAvailableException(
 116                         "Namespace " + type + " is not available in phase " + currentPhase);
 117             }
 118         }
 119
 120         Verify.verify(type.equals(potential.getIdentifier()));
 121         /*
 122          * Safe cast, previous checkState checks equivalence of key from which type argument are
 123          * derived
 124          */
 125         return (NamespaceBehaviourWithListeners<K, V, N>) potential;
 126     }
 127
 128     @SuppressWarnings({"unchecked", "rawtypes"})
 129     private <K, V, N extends IdentifierNamespace<K, V>> NamespaceBehaviourWithListeners<K, V, N> createNamespaceContext(
 130             final NamespaceBehaviour<K, V, N> potentialRaw) {
 131         if (potentialRaw instanceof DerivedNamespaceBehaviour) {
 132             VirtualNamespaceContext derivedContext =
 133                     new VirtualNamespaceContext((DerivedNamespaceBehaviour) potentialRaw);
 134             getNamespaceBehaviour(((DerivedNamespaceBehaviour) potentialRaw).getDerivedFrom())
 135                     .addDerivedNamespace(derivedContext);
 136             return derivedContext;
 137         }
 138         return new SimpleNamespaceContext<>(potentialRaw);
 139     }
 140
 141     public StatementDefinitionContext<?, ?, ?> getStatementDefinition(final QName name) {
 142         StatementDefinitionContext<?, ?, ?> potential = definitions.get(name);
 143         if (potential == null) {
 144             StatementSupport<?, ?, ?> potentialRaw = supports.get(currentPhase).getStatementDefinition(name);
 145             if (potentialRaw != null) {
 146                 potential = new StatementDefinitionContext<>(potentialRaw);
 147                 definitions.put(name, potential);
 148             }
 149         }
 150         return potential;
 151     }
 152
 153     public EffectiveModelContext build() throws SourceException, ReactorException {
 154         for (ModelProcessingPhase phase : PHASE_EXECUTION_ORDER) {
 155             startPhase(phase);
 156             loadPhaseStatements();
 157             completePhaseActions();
 158             endPhase(phase);
 159         }
 160         return transform();
 161     }
 162
 163     private EffectiveModelContext transform() {
 164         Preconditions.checkState(finishedPhase == ModelProcessingPhase.EFFECTIVE_MODEL);
 165         List<DeclaredStatement<?>> rootStatements = new ArrayList<>(sources.size());
 166         for (SourceSpecificContext source : sources) {
 167             rootStatements.add(source.getRoot().buildDeclared());
 168         }
 169         return new EffectiveModelContext(rootStatements);
 170     }
 171
 172     public EffectiveSchemaContext buildEffective() throws SourceException, ReactorException {
 173         for (ModelProcessingPhase phase : PHASE_EXECUTION_ORDER) {
 174             startPhase(phase);
 175             loadPhaseStatements();
 176             completePhaseActions();
 177             endPhase(phase);
 178         }
 179         return transformEffective();
 180     }
 181
 182     private EffectiveSchemaContext transformEffective() {
 183         Preconditions.checkState(finishedPhase == ModelProcessingPhase.EFFECTIVE_MODEL);
 184         List<DeclaredStatement<?>> rootStatements = new ArrayList<>(sources.size());
 185         List<EffectiveStatement<?,?>> rootEffectiveStatements = new ArrayList<>(sources.size());
 186
 187         for (SourceSpecificContext source : sources) {
 188             final RootStatementContext<?, ?, ?> root = source.getRoot();
 189             rootStatements.add(root.buildDeclared());
 190             rootEffectiveStatements.add(root.buildEffective());
 191         }
 192
 193         return new EffectiveSchemaContext(rootStatements, rootEffectiveStatements);
 194     }
 195
 196     private void startPhase(final ModelProcessingPhase phase) {
 197         Preconditions.checkState(Objects.equals(finishedPhase, phase.getPreviousPhase()));
 198         for (SourceSpecificContext source : sources) {
 199             source.startPhase(phase);
 200         }
 201         currentPhase = phase;
 202     }
 203
 204     private  void loadPhaseStatements() throws SourceException {
 205         Preconditions.checkState(currentPhase != null);
 206         for (SourceSpecificContext source : sources) {
 207             source.loadStatements();
 208         }
 209     }
 210
 211     private SomeModifiersUnresolvedException addSourceExceptions(final SomeModifiersUnresolvedException buildFailure,
 212             final List<SourceSpecificContext> sourcesToProgress) {
 213         boolean addedCause = false;
 214         for (SourceSpecificContext failedSource : sourcesToProgress) {
 215             final SourceException sourceEx = failedSource.failModifiers(currentPhase);
 216
 217             // Workaround for broken logging implementations which ignore suppressed exceptions
 218             Throwable cause = sourceEx.getCause() != null ? sourceEx.getCause() : sourceEx;
 219             if (LOG.isDebugEnabled()) {
 220                 LOG.error("Failed to parse YANG from source {}", failedSource, sourceEx);
 221             } else {
 222                 LOG.error("Failed to parse YANG from source {}: {}", failedSource, cause.getMessage());
 223             }
 224
 225             final Throwable[] suppressed = sourceEx.getSuppressed();
 226             if (suppressed.length > 0) {
 227                 LOG.error("{} additional errors reported:", suppressed.length);
 228
 229                 int i = 1;
 230                 for (Throwable t : suppressed) {
 231                     // FIXME: this should be configured in the appender, really
 232                     if (LOG.isDebugEnabled()) {
 233                         LOG.error("Error {}: {}", i, t.getMessage(), t);
 234                     } else {
 235                         LOG.error("Error {}: {}", i, t.getMessage());
 236                     }
 237
 238                     i++;
 239                 }
 240             }
 241
 242             if (!addedCause) {
 243                 addedCause = true;
 244                 buildFailure.initCause(sourceEx);
 245             } else {
 246                 buildFailure.addSuppressed(sourceEx);
 247             }
 248         }
 249         return buildFailure;
 250     }
 251
 252     private  void completePhaseActions() throws ReactorException {
 253         Preconditions.checkState(currentPhase != null);
 254         List<SourceSpecificContext> sourcesToProgress = Lists.newArrayList(sources);
 255         try {
 256             boolean progressing = true;
 257             while (progressing) {
 258                 // We reset progressing to false.
 259                 progressing = false;
 260                 Iterator<SourceSpecificContext> currentSource = sourcesToProgress.iterator();
 261                 while(currentSource.hasNext()) {
 262                     SourceSpecificContext nextSourceCtx = currentSource.next();
 263                     PhaseCompletionProgress sourceProgress = nextSourceCtx.tryToCompletePhase(currentPhase);
 264                     switch (sourceProgress) {
 265                         case FINISHED:
 266                             currentSource.remove();
 267                             // Fallback to progress, since we were able to make progress in computation
 268                         case PROGRESS:
 269                             progressing = true;
 270                             break;
 271                         case NO_PROGRESS:
 272                             // Noop
 273                             break;
 274                         default:
 275                            throw new IllegalStateException("Unsupported phase progress " + sourceProgress);
 276                     }
 277                 }
 278             }
 279         } catch (SourceException e) {
 280             throw Throwables.propagate(e);
 281         }
 282         if (!sourcesToProgress.isEmpty()) {
 283             SomeModifiersUnresolvedException buildFailure = new SomeModifiersUnresolvedException(currentPhase);
 284             buildFailure = addSourceExceptions(buildFailure, sourcesToProgress);
 285             throw buildFailure;
 286         }
 287     }
 288
 289     private  void endPhase(final ModelProcessingPhase phase) {
 290         Preconditions.checkState(currentPhase == phase);
 291         finishedPhase = currentPhase;
 292     }
 293
 294     public Set<SourceSpecificContext> getSources() {
 295         return sources;
 296     }
 297 }