2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
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
8 package org.opendaylight.mdsal.binding.spec.reflect;
10 import static com.google.common.base.Preconditions.checkArgument;
11 import static com.google.common.base.Preconditions.checkState;
13 import com.google.common.annotations.Beta;
14 import com.google.common.annotations.VisibleForTesting;
15 import com.google.common.cache.CacheBuilder;
16 import com.google.common.cache.CacheLoader;
17 import com.google.common.cache.LoadingCache;
18 import com.google.common.collect.ImmutableSet;
19 import com.google.common.collect.ImmutableSet.Builder;
20 import com.google.common.util.concurrent.ListenableFuture;
21 import java.lang.reflect.Field;
22 import java.lang.reflect.InvocationTargetException;
23 import java.lang.reflect.Method;
24 import java.lang.reflect.Type;
25 import java.util.Optional;
26 import java.util.ServiceLoader;
27 import java.util.concurrent.TimeUnit;
28 import java.util.regex.Matcher;
29 import java.util.regex.Pattern;
30 import org.checkerframework.checker.regex.qual.Regex;
31 import org.eclipse.jdt.annotation.NonNull;
32 import org.opendaylight.mdsal.binding.spec.naming.BindingMapping;
33 import org.opendaylight.yangtools.util.ClassLoaderUtils;
34 import org.opendaylight.yangtools.yang.binding.Action;
35 import org.opendaylight.yangtools.yang.binding.Augmentable;
36 import org.opendaylight.yangtools.yang.binding.Augmentation;
37 import org.opendaylight.yangtools.yang.binding.BaseIdentity;
38 import org.opendaylight.yangtools.yang.binding.BindingContract;
39 import org.opendaylight.yangtools.yang.binding.ChildOf;
40 import org.opendaylight.yangtools.yang.binding.DataContainer;
41 import org.opendaylight.yangtools.yang.binding.DataObject;
42 import org.opendaylight.yangtools.yang.binding.Notification;
43 import org.opendaylight.yangtools.yang.binding.Rpc;
44 import org.opendaylight.yangtools.yang.binding.RpcService;
45 import org.opendaylight.yangtools.yang.binding.YangModelBindingProvider;
46 import org.opendaylight.yangtools.yang.binding.YangModuleInfo;
47 import org.opendaylight.yangtools.yang.common.QName;
48 import org.opendaylight.yangtools.yang.common.QNameModule;
49 import org.opendaylight.yangtools.yang.common.YangConstants;
50 import org.slf4j.Logger;
51 import org.slf4j.LoggerFactory;
53 public final class BindingReflections {
55 private static final long EXPIRATION_TIME = 60;
58 private static final String ROOT_PACKAGE_PATTERN_STRING =
59 "(org.opendaylight.yang.gen.v1.[a-z0-9_\\.]*\\.(?:rev[0-9][0-9][0-1][0-9][0-3][0-9]|norev))";
60 private static final Pattern ROOT_PACKAGE_PATTERN = Pattern.compile(ROOT_PACKAGE_PATTERN_STRING);
61 private static final Logger LOG = LoggerFactory.getLogger(BindingReflections.class);
63 private static final LoadingCache<Class<?>, Optional<QName>> CLASS_TO_QNAME = CacheBuilder.newBuilder()
65 .expireAfterAccess(EXPIRATION_TIME, TimeUnit.SECONDS)
66 .build(new ClassToQNameLoader());
68 private static final LoadingCache<ClassLoader, ImmutableSet<YangModuleInfo>> MODULE_INFO_CACHE =
69 CacheBuilder.newBuilder().weakKeys().weakValues().build(
70 new CacheLoader<ClassLoader, ImmutableSet<YangModuleInfo>>() {
72 public ImmutableSet<YangModuleInfo> load(final ClassLoader key) {
73 return loadModuleInfos(key);
77 private BindingReflections() {
82 * Find augmentation target class from concrete Augmentation class. This method uses first generic argument of
83 * implemented {@link Augmentation} interface.
86 * {@link Augmentation} subclass for which we want to determine
87 * augmentation target.
88 * @return Augmentation target - class which augmentation provides additional extensions.
90 public static Class<? extends Augmentable<?>> findAugmentationTarget(
91 final Class<? extends Augmentation<?>> augmentation) {
92 final Optional<Class<Augmentable<?>>> opt = ClassLoaderUtils.findFirstGenericArgument(augmentation,
94 return opt.orElse(null);
98 * Returns a QName associated to supplied type.
100 * @param dataType Data type class
101 * @return QName associated to supplied dataType. If dataType is Augmentation method does not return canonical
102 * QName, but QName with correct namespace revision, but virtual local name, since augmentations do not
103 * have name. May return null if QName is not present.
105 public static QName findQName(final Class<?> dataType) {
106 return CLASS_TO_QNAME.getUnchecked(dataType).orElse(null);
110 * Checks if method is RPC invocation.
112 * @param possibleMethod
114 * @return true if method is RPC invocation, false otherwise.
116 public static boolean isRpcMethod(final Method possibleMethod) {
117 return possibleMethod != null && RpcService.class.isAssignableFrom(possibleMethod.getDeclaringClass())
118 && ListenableFuture.class.isAssignableFrom(possibleMethod.getReturnType())
119 // length <= 2: it seemed to be impossible to get correct RpcMethodInvoker because of
120 // resolveRpcInputClass() check.While RpcMethodInvoker counts with one argument for
121 // non input type and two arguments for input type, resolveRpcInputClass() counting
122 // with zero for non input and one for input type
123 && possibleMethod.getParameterCount() <= 2;
127 * Extracts Output class for RPC method.
129 * @param targetMethod method to scan
130 * @return Optional.empty() if result type could not be get, or return type is Void.
131 * @deprecated This method is unused and scheduled for removal
133 @Deprecated(since = "10.0.4", forRemoval = true)
134 @SuppressWarnings("rawtypes")
135 public static Optional<Class<?>> resolveRpcOutputClass(final Method targetMethod) {
136 checkState(isRpcMethod(targetMethod), "Supplied method is not a RPC invocation method");
137 Type futureType = targetMethod.getGenericReturnType();
138 Type rpcResultType = ClassLoaderUtils.getFirstGenericParameter(futureType).orElse(null);
139 Type rpcResultArgument = ClassLoaderUtils.getFirstGenericParameter(rpcResultType).orElse(null);
140 if (rpcResultArgument instanceof Class cls && !Void.class.equals(rpcResultArgument)) {
141 return Optional.of(cls);
143 return Optional.empty();
147 * Extracts input class for RPC method.
149 * @param targetMethod method to scan
150 * @return Optional.empty() if RPC has no input, RPC input type otherwise.
151 * @deprecated This method is unused and scheduled for removal
153 @Deprecated(since = "10.0.4", forRemoval = true)
154 @SuppressWarnings("rawtypes")
155 public static Optional<Class<? extends DataContainer>> resolveRpcInputClass(final Method targetMethod) {
156 for (Class clazz : targetMethod.getParameterTypes()) {
157 if (DataContainer.class.isAssignableFrom(clazz)) {
158 return Optional.of(clazz);
161 return Optional.empty();
164 public static @NonNull QName getQName(final BaseIdentity identity) {
165 return getContractQName(identity);
168 public static @NonNull QName getQName(final Rpc<?, ?> rpc) {
169 return getContractQName(rpc);
172 private static @NonNull QName getContractQName(final BindingContract<?> contract) {
173 return CLASS_TO_QNAME.getUnchecked(contract.implementedInterface())
174 .orElseThrow(() -> new IllegalStateException("Failed to resolve QName of " + contract));
178 * Returns root package name for supplied package.
181 * Package for which find model root package.
182 * @return Package of model root.
184 public static String getModelRootPackageName(final Package pkg) {
185 return getModelRootPackageName(pkg.getName());
189 * Returns root package name for supplied package name.
192 * Package for which find model root package.
193 * @return Package of model root.
195 public static String getModelRootPackageName(final String name) {
196 checkArgument(name != null, "Package name should not be null.");
197 checkArgument(name.startsWith(BindingMapping.PACKAGE_PREFIX), "Package name not starting with %s, is: %s",
198 BindingMapping.PACKAGE_PREFIX, name);
199 Matcher match = ROOT_PACKAGE_PATTERN.matcher(name);
200 checkArgument(match.find(), "Package name '%s' does not match required pattern '%s'", name,
201 ROOT_PACKAGE_PATTERN_STRING);
202 return match.group(0);
205 public static QNameModule getQNameModule(final Class<?> clz) {
206 if (DataContainer.class.isAssignableFrom(clz) || BaseIdentity.class.isAssignableFrom(clz)
207 || Action.class.isAssignableFrom(clz)) {
208 return findQName(clz).getModule();
211 return getModuleInfo(clz).getName().getModule();
215 * Returns instance of {@link YangModuleInfo} of declaring model for specific class.
217 * @param cls data object class
218 * @return Instance of {@link YangModuleInfo} associated with model, from which this class was derived.
220 public static @NonNull YangModuleInfo getModuleInfo(final Class<?> cls) {
221 final String packageName = getModelRootPackageName(cls.getPackage());
222 final String potentialClassName = getModuleInfoClassName(packageName);
223 final Class<?> moduleInfoClass;
225 moduleInfoClass = cls.getClassLoader().loadClass(potentialClassName);
226 } catch (ClassNotFoundException e) {
227 throw new IllegalStateException("Failed to load " + potentialClassName, e);
230 final Object infoInstance;
232 infoInstance = moduleInfoClass.getMethod("getInstance").invoke(null);
233 } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
234 throw new IllegalStateException("Failed to get instance of " + moduleInfoClass, e);
237 checkState(infoInstance instanceof YangModuleInfo, "Unexpected instance %s", infoInstance);
238 return (YangModuleInfo) infoInstance;
241 public static @NonNull String getModuleInfoClassName(final String packageName) {
242 return packageName + "." + BindingMapping.MODULE_INFO_CLASS_NAME;
246 * Check if supplied class is derived from YANG model.
250 * @return true if class is derived from YANG model.
252 public static boolean isBindingClass(final Class<?> cls) {
253 if (DataContainer.class.isAssignableFrom(cls) || Augmentation.class.isAssignableFrom(cls)) {
256 return cls.getName().startsWith(BindingMapping.PACKAGE_PREFIX);
260 * Checks if supplied method is callback for notifications.
262 * @param method method to check
263 * @return true if method is notification callback.
265 public static boolean isNotificationCallback(final Method method) {
266 checkArgument(method != null);
267 if (method.getName().startsWith("on") && method.getParameterCount() == 1) {
268 Class<?> potentialNotification = method.getParameterTypes()[0];
269 if (isNotification(potentialNotification)
270 && method.getName().equals("on" + potentialNotification.getSimpleName())) {
278 * Checks is supplied class is a {@link Notification}.
280 * @param potentialNotification class to examine
281 * @return True if the class represents a Notification.
284 static boolean isNotification(final Class<?> potentialNotification) {
285 checkArgument(potentialNotification != null, "potentialNotification must not be null.");
286 return Notification.class.isAssignableFrom(potentialNotification);
290 * Loads {@link YangModuleInfo} infos available on current classloader. This method is shorthand for
291 * {@link #loadModuleInfos(ClassLoader)} with {@link Thread#getContextClassLoader()} for current thread.
293 * @return Set of {@link YangModuleInfo} available for current classloader.
295 public static @NonNull ImmutableSet<YangModuleInfo> loadModuleInfos() {
296 return loadModuleInfos(Thread.currentThread().getContextClassLoader());
300 * Loads {@link YangModuleInfo} infos available on supplied classloader.
303 * {@link YangModuleInfo} are discovered using {@link ServiceLoader} for {@link YangModelBindingProvider}.
304 * {@link YangModelBindingProvider} are simple classes which holds only pointers to actual instance
305 * {@link YangModuleInfo}.
308 * When {@link YangModuleInfo} is available, all dependencies are recursively collected into returning set by
309 * collecting results of {@link YangModuleInfo#getImportedModules()}.
312 * Consider using {@link #cacheModuleInfos(ClassLoader)} if the classloader is known to be immutable.
314 * @param loader Classloader for which {@link YangModuleInfo} should be retrieved.
315 * @return Set of {@link YangModuleInfo} available for supplied classloader.
317 public static @NonNull ImmutableSet<YangModuleInfo> loadModuleInfos(final ClassLoader loader) {
318 Builder<YangModuleInfo> moduleInfoSet = ImmutableSet.builder();
319 ServiceLoader<YangModelBindingProvider> serviceLoader = ServiceLoader.load(YangModelBindingProvider.class,
321 for (YangModelBindingProvider bindingProvider : serviceLoader) {
322 YangModuleInfo moduleInfo = bindingProvider.getModuleInfo();
323 checkState(moduleInfo != null, "Module Info for %s is not available.", bindingProvider.getClass());
324 collectYangModuleInfo(bindingProvider.getModuleInfo(), moduleInfoSet);
326 return moduleInfoSet.build();
330 * Loads {@link YangModuleInfo} instances available on supplied {@link ClassLoader}, assuming the set of available
331 * information does not change. Subsequent accesses may return cached values.
334 * {@link YangModuleInfo} are discovered using {@link ServiceLoader} for {@link YangModelBindingProvider}.
335 * {@link YangModelBindingProvider} are simple classes which holds only pointers to actual instance
336 * {@link YangModuleInfo}.
339 * When {@link YangModuleInfo} is available, all dependencies are recursively collected into returning set by
340 * collecting results of {@link YangModuleInfo#getImportedModules()}.
342 * @param loader Class loader for which {@link YangModuleInfo} should be retrieved.
343 * @return Set of {@link YangModuleInfo} available for supplied classloader.
346 public static @NonNull ImmutableSet<YangModuleInfo> cacheModuleInfos(final ClassLoader loader) {
347 return MODULE_INFO_CACHE.getUnchecked(loader);
350 private static void collectYangModuleInfo(final YangModuleInfo moduleInfo,
351 final Builder<YangModuleInfo> moduleInfoSet) {
352 moduleInfoSet.add(moduleInfo);
353 for (YangModuleInfo dependency : moduleInfo.getImportedModules()) {
354 collectYangModuleInfo(dependency, moduleInfoSet);
359 * Checks if supplied class represents RPC Input / RPC Output.
362 * Class to be checked
363 * @return true if class represents RPC Input or RPC Output class.
365 public static boolean isRpcType(final Class<? extends DataObject> targetType) {
366 return DataContainer.class.isAssignableFrom(targetType)
367 && !ChildOf.class.isAssignableFrom(targetType)
368 && !Notification.class.isAssignableFrom(targetType)
369 && (targetType.getName().endsWith("Input") || targetType.getName().endsWith("Output"));
372 private static class ClassToQNameLoader extends CacheLoader<Class<?>, Optional<QName>> {
375 public Optional<QName> load(@SuppressWarnings("NullableProblems") final Class<?> key) throws Exception {
376 return resolveQNameNoCache(key);
380 * Tries to resolve QName for supplied class. Looks up for static field with name from constant
381 * {@link BindingMapping#QNAME_STATIC_FIELD_NAME} and returns value if present. If field is not present uses
382 * {@link #computeQName(Class)} to compute QName for missing types.
384 private static Optional<QName> resolveQNameNoCache(final Class<?> key) {
388 field = key.getField(BindingMapping.QNAME_STATIC_FIELD_NAME);
389 } catch (NoSuchFieldException e) {
390 LOG.debug("{} does not have a {} field, falling back to computation", key,
391 BindingMapping.QNAME_STATIC_FIELD_NAME, e);
392 return Optional.of(computeQName(key));
395 final Object obj = field.get(null);
396 if (obj instanceof QName qname) {
397 return Optional.of(qname);
399 } catch (SecurityException | IllegalArgumentException | IllegalAccessException e) {
401 * It is safe to log this this exception on debug, since this method should not fail. Only failures are
402 * possible if the runtime / backing is inconsistent.
404 LOG.debug("Unexpected exception during extracting QName for {}", key, e);
406 return Optional.empty();
410 * Computes QName for supplied class. Namespace and revision are same as {@link YangModuleInfo} associated with
416 * <li>rpc input: local name is "input".
417 * <li>rpc output: local name is "output".
418 * <li>augmentation: local name is "module name".
422 * There is also fallback, if it is not possible to compute QName using following algorithm returns module
425 * @throws IllegalStateException If YangModuleInfo could not be resolved
426 * @throws IllegalArgumentException If supplied class was not derived from YANG model.
428 // FIXME: Extend this algorithm to also provide QName for YANG modeled simple types.
429 @SuppressWarnings({ "rawtypes", "unchecked" })
430 private static QName computeQName(final Class key) {
431 checkArgument(isBindingClass(key), "Supplied class %s is not derived from YANG.", key);
433 final QName module = getModuleInfo(key).getName();
434 if (Augmentation.class.isAssignableFrom(key)) {
436 } else if (isRpcType(key)) {
437 final String className = key.getSimpleName();
438 if (className.endsWith(BindingMapping.RPC_OUTPUT_SUFFIX)) {
439 return YangConstants.operationOutputQName(module.getModule()).intern();
442 return YangConstants.operationInputQName(module.getModule()).intern();
446 * Fallback for Binding types which do not have QNAME field