binding/mdsal-binding-generator-impl/src/main/java/org/opendaylight/mdsal/binding/generator/impl/ModuleInfoBackedContext.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.mdsal.binding.generator.impl;
   9
  10 import com.google.common.base.Optional;
  11 import com.google.common.util.concurrent.Futures;
  12 import com.google.common.util.concurrent.ListenableFuture;
  13 import java.lang.ref.WeakReference;
  14 import java.util.concurrent.ConcurrentHashMap;
  15 import java.util.concurrent.ConcurrentMap;
  16 import org.opendaylight.mdsal.binding.generator.api.ClassLoadingStrategy;
  17 import org.opendaylight.mdsal.binding.generator.api.ModuleInfoRegistry;
  18 import org.opendaylight.yangtools.concepts.AbstractObjectRegistration;
  19 import org.opendaylight.yangtools.concepts.ObjectRegistration;
  20 import org.opendaylight.yangtools.util.ClassLoaderUtils;
  21 import org.opendaylight.yangtools.yang.binding.YangModuleInfo;
  22 import org.opendaylight.yangtools.yang.binding.util.BindingReflections;
  23 import org.opendaylight.yangtools.yang.common.QName;
  24 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  25 import org.opendaylight.yangtools.yang.model.api.SchemaContextProvider;
  26 import org.opendaylight.yangtools.yang.model.repo.api.RevisionSourceIdentifier;
  27 import org.opendaylight.yangtools.yang.model.repo.api.SchemaSourceException;
  28 import org.opendaylight.yangtools.yang.model.repo.api.SourceIdentifier;
  29 import org.opendaylight.yangtools.yang.model.repo.api.YangTextSchemaSource;
  30 import org.opendaylight.yangtools.yang.model.repo.spi.SchemaSourceProvider;
  31 import org.opendaylight.yangtools.yang.parser.repo.YangTextSchemaContextResolver;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34
  35 public class ModuleInfoBackedContext extends GeneratedClassLoadingStrategy
  36         implements ModuleInfoRegistry, SchemaContextProvider, SchemaSourceProvider<YangTextSchemaSource> {
  37
  38     private final YangTextSchemaContextResolver ctxResolver = YangTextSchemaContextResolver.create("binding-context");
  39
  40     private ModuleInfoBackedContext(final ClassLoadingStrategy loadingStrategy) {
  41         this.backingLoadingStrategy = loadingStrategy;
  42     }
  43
  44     public static ModuleInfoBackedContext create() {
  45         return new ModuleInfoBackedContext(getTCCLClassLoadingStrategy());
  46     }
  47
  48     public static ModuleInfoBackedContext create(final ClassLoadingStrategy loadingStrategy) {
  49         return new ModuleInfoBackedContext(loadingStrategy);
  50     }
  51
  52     private static final Logger LOG = LoggerFactory.getLogger(ModuleInfoBackedContext.class);
  53
  54     private final ConcurrentMap<String, WeakReference<ClassLoader>> packageNameToClassLoader =
  55             new ConcurrentHashMap<>();
  56     private final ConcurrentMap<SourceIdentifier, YangModuleInfo> sourceIdentifierToModuleInfo =
  57             new ConcurrentHashMap<>();
  58
  59     private final ClassLoadingStrategy backingLoadingStrategy;
  60
  61     @Override
  62     public Class<?> loadClass(final String fullyQualifiedName) throws ClassNotFoundException {
  63         final String modulePackageName = BindingReflections.getModelRootPackageName(fullyQualifiedName);
  64         final WeakReference<ClassLoader> classLoaderRef = packageNameToClassLoader.get(modulePackageName);
  65         if (classLoaderRef != null) {
  66             final ClassLoader classLoader = classLoaderRef.get();
  67             if (classLoader != null) {
  68                 return ClassLoaderUtils.loadClass(classLoader, fullyQualifiedName);
  69             }
  70         }
  71
  72         if (backingLoadingStrategy == null) {
  73             throw new ClassNotFoundException(fullyQualifiedName);
  74         }
  75
  76         final Class<?> cls = backingLoadingStrategy.loadClass(fullyQualifiedName);
  77         if (BindingReflections.isBindingClass(cls)) {
  78             resolveModuleInfo(cls);
  79         }
  80
  81         return cls;
  82     }
  83
  84     // TODO finish schema parsing and expose as SchemaService
  85     // Unite with current SchemaService
  86     // Implement remove ModuleInfo to update SchemaContext
  87
  88     public Optional<SchemaContext> tryToCreateSchemaContext() {
  89         return Optional.fromJavaUtil(ctxResolver.getSchemaContext());
  90     }
  91
  92     private boolean resolveModuleInfo(final Class<?> cls) {
  93         try {
  94             return resolveModuleInfo(BindingReflections.getModuleInfo(cls));
  95         } catch (Exception e) {
  96             throw new IllegalStateException(String.format("Failed to resolve module information for class %s", cls), e);
  97         }
  98     }
  99
 100     private boolean resolveModuleInfo(final YangModuleInfo moduleInfo) {
 101
 102         SourceIdentifier identifier = sourceIdentifierFrom(moduleInfo);
 103         YangModuleInfo previous = sourceIdentifierToModuleInfo.putIfAbsent(identifier, moduleInfo);
 104         ClassLoader moduleClassLoader = moduleInfo.getClass().getClassLoader();
 105         try {
 106             if (previous == null) {
 107                 String modulePackageName = moduleInfo.getClass().getPackage().getName();
 108                 packageNameToClassLoader.putIfAbsent(modulePackageName,
 109                         new WeakReference<>(moduleClassLoader));
 110                 ctxResolver.registerSource(toYangTextSource(identifier, moduleInfo));
 111                 for (YangModuleInfo importedInfo : moduleInfo.getImportedModules()) {
 112                     resolveModuleInfo(importedInfo);
 113                 }
 114             } else {
 115                 return false;
 116             }
 117         } catch (Exception e) {
 118             LOG.error("Not including {} in YANG sources because of error.", moduleInfo, e);
 119         }
 120         return true;
 121     }
 122
 123     private static YangTextSchemaSource toYangTextSource(final SourceIdentifier identifier,
 124             final YangModuleInfo moduleInfo) {
 125         return YangTextSchemaSource.delegateForByteSource(identifier, moduleInfo.getYangTextByteSource());
 126     }
 127
 128     private static SourceIdentifier sourceIdentifierFrom(final YangModuleInfo moduleInfo) {
 129         final QName name = moduleInfo.getName();
 130         return RevisionSourceIdentifier.create(name.getLocalName(), name.getRevision());
 131     }
 132
 133     public void addModuleInfos(final Iterable<? extends YangModuleInfo> moduleInfos) {
 134         for (YangModuleInfo yangModuleInfo : moduleInfos) {
 135             registerModuleInfo(yangModuleInfo);
 136         }
 137     }
 138
 139     @Override
 140     public ObjectRegistration<YangModuleInfo> registerModuleInfo(final YangModuleInfo yangModuleInfo) {
 141         YangModuleInfoRegistration registration = new YangModuleInfoRegistration(yangModuleInfo, this);
 142         resolveModuleInfo(yangModuleInfo);
 143         return registration;
 144     }
 145
 146     @Override
 147     public ListenableFuture<? extends YangTextSchemaSource> getSource(
 148         final SourceIdentifier sourceIdentifier) {
 149         final YangModuleInfo yangModuleInfo = sourceIdentifierToModuleInfo.get(sourceIdentifier);
 150
 151         if (yangModuleInfo == null) {
 152             LOG.debug("Unknown schema source requested: {}, available sources: {}", sourceIdentifier,
 153                 sourceIdentifierToModuleInfo.keySet());
 154             return Futures.immediateFailedFuture(new SchemaSourceException(
 155                 "Unknown schema source: " + sourceIdentifier));
 156         }
 157
 158         return Futures.immediateFuture(YangTextSchemaSource.delegateForByteSource(sourceIdentifier,
 159             yangModuleInfo.getYangTextByteSource()));
 160     }
 161
 162     private static class YangModuleInfoRegistration extends AbstractObjectRegistration<YangModuleInfo> {
 163
 164         private final ModuleInfoBackedContext context;
 165
 166         public YangModuleInfoRegistration(final YangModuleInfo instance, final ModuleInfoBackedContext context) {
 167             super(instance);
 168             this.context = context;
 169         }
 170
 171         @Override
 172         protected void removeRegistration() {
 173             context.remove(this);
 174         }
 175
 176     }
 177
 178     private void remove(final YangModuleInfoRegistration registration) {
 179         // FIXME implement
 180     }
 181
 182     @Override
 183     public SchemaContext getSchemaContext() {
 184         final Optional<SchemaContext> contextOptional = tryToCreateSchemaContext();
 185         if (contextOptional.isPresent()) {
 186             return contextOptional.get();
 187
 188         }
 189         throw new IllegalStateException("Unable to recreate SchemaContext, error while parsing");
 190     }
 191 }