2 * Copyright (c) 2016 Brocade Communications 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.controller.blueprint.ext;
10 import com.google.common.base.Optional;
11 import com.google.common.base.Preconditions;
12 import com.google.common.base.Strings;
13 import com.google.common.util.concurrent.CheckedFuture;
14 import com.google.common.util.concurrent.FutureCallback;
15 import com.google.common.util.concurrent.Futures;
17 import java.io.FileInputStream;
18 import java.util.Collection;
19 import java.util.Collections;
20 import java.util.List;
21 import java.util.Objects;
22 import java.util.concurrent.atomic.AtomicBoolean;
23 import javax.annotation.Nonnull;
24 import javax.annotation.Nullable;
25 import javax.xml.parsers.DocumentBuilderFactory;
26 import org.apache.aries.blueprint.services.ExtendedBlueprintContainer;
27 import org.opendaylight.controller.md.sal.binding.api.ClusteredDataTreeChangeListener;
28 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
29 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
30 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification.ModificationType;
31 import org.opendaylight.controller.md.sal.binding.api.DataTreeIdentifier;
32 import org.opendaylight.controller.md.sal.binding.api.DataTreeModification;
33 import org.opendaylight.controller.md.sal.binding.api.ReadOnlyTransaction;
34 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
35 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
36 import org.opendaylight.controller.sal.core.api.model.SchemaService;
37 import org.opendaylight.yangtools.binding.data.codec.api.BindingNormalizedNodeSerializer;
38 import org.opendaylight.yangtools.concepts.ListenerRegistration;
39 import org.opendaylight.yangtools.yang.binding.DataObject;
40 import org.opendaylight.yangtools.yang.binding.Identifiable;
41 import org.opendaylight.yangtools.yang.binding.Identifier;
42 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
43 import org.opendaylight.yangtools.yang.binding.util.BindingReflections;
44 import org.opendaylight.yangtools.yang.common.QName;
45 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
46 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
47 import org.opendaylight.yangtools.yang.data.impl.codec.xml.XmlUtils;
48 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
49 import org.opendaylight.yangtools.yang.data.impl.schema.transform.dom.parser.DomToNormalizedNodeParserFactory;
50 import org.opendaylight.yangtools.yang.model.api.ContainerSchemaNode;
51 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
52 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
53 import org.opendaylight.yangtools.yang.model.api.Module;
54 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
55 import org.osgi.service.blueprint.container.ComponentDefinitionException;
56 import org.slf4j.Logger;
57 import org.slf4j.LoggerFactory;
58 import org.w3c.dom.Document;
59 import org.w3c.dom.Element;
62 * Factory metadata corresponding to the "clustered-app-config" element that obtains an application's
63 * config data from the data store and provides the binding DataObject instance to the Blueprint container
64 * as a bean. In addition registers a DataTreeChangeListener to restart the Blueprint container when the
65 * config data is changed.
67 * @author Thomas Pantelis
69 public class DataStoreAppConfigMetadata extends AbstractDependentComponentFactoryMetadata {
70 private static final Logger LOG = LoggerFactory.getLogger(DataStoreAppConfigMetadata.class);
72 static final String BINDING_CLASS = "binding-class";
73 static final String DEFAULT_CONFIG = "default-config";
74 static final String DEFAULT_CONFIG_FILE_NAME = "default-config-file-name";
75 static final String LIST_KEY_VALUE = "list-key-value";
77 private static final String DEFAULT_APP_CONFIG_FILE_PATH = "etc" + File.separator +
78 "opendaylight" + File.separator + "datastore" + File.separator + "initial" +
79 File.separator + "config";
81 private static final DocumentBuilderFactory DOC_BUILDER_FACTORY;
84 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
85 factory.setNamespaceAware(true);
86 factory.setCoalescing(true);
87 factory.setIgnoringElementContentWhitespace(true);
88 factory.setIgnoringComments(true);
89 DOC_BUILDER_FACTORY = factory;
92 private final Element defaultAppConfigElement;
93 private final String defaultAppConfigFileName;
94 private final String appConfigBindingClassName;
95 private final String appConfigListKeyValue;
96 private final UpdateStrategy appConfigUpdateStrategy;
97 private final AtomicBoolean readingInitialAppConfig = new AtomicBoolean(true);
99 private volatile BindingContext bindingContext;
100 private volatile ListenerRegistration<?> appConfigChangeListenerReg;
101 private volatile DataObject currentAppConfig;
103 // Note: the BindingNormalizedNodeSerializer interface is annotated as deprecated because there's an
104 // equivalent interface in the mdsal project but the corresponding binding classes in the controller
105 // project are still used - conversion to the mdsal binding classes hasn't occurred yet.
106 private volatile BindingNormalizedNodeSerializer bindingSerializer;
108 public DataStoreAppConfigMetadata(@Nonnull String id, @Nonnull String appConfigBindingClassName,
109 @Nullable String appConfigListKeyValue, @Nullable String defaultAppConfigFileName,
110 @Nonnull UpdateStrategy updateStrategyValue, @Nullable Element defaultAppConfigElement) {
112 this.defaultAppConfigElement = defaultAppConfigElement;
113 this.defaultAppConfigFileName = defaultAppConfigFileName;
114 this.appConfigBindingClassName = appConfigBindingClassName;
115 this.appConfigListKeyValue = appConfigListKeyValue;
116 this.appConfigUpdateStrategy = updateStrategyValue;
120 @SuppressWarnings("unchecked")
121 public void init(ExtendedBlueprintContainer container) {
122 super.init(container);
124 Class<DataObject> appConfigBindingClass;
126 Class<?> bindingClass = container.getBundleContext().getBundle().loadClass(appConfigBindingClassName);
127 if(!DataObject.class.isAssignableFrom(bindingClass)) {
128 throw new ComponentDefinitionException(String.format(
129 "%s: Specified app config binding class %s does not extend %s",
130 logName(), appConfigBindingClassName, DataObject.class.getName()));
133 appConfigBindingClass = (Class<DataObject>) bindingClass;
134 } catch(ClassNotFoundException e) {
135 throw new ComponentDefinitionException(String.format("%s: Error loading app config binding class %s",
136 logName(), appConfigBindingClassName), e);
139 if(Identifiable.class.isAssignableFrom(appConfigBindingClass)) {
140 // The binding class corresponds to a yang list.
141 if(Strings.isNullOrEmpty(appConfigListKeyValue)) {
142 throw new ComponentDefinitionException(String.format(
143 "%s: App config binding class %s represents a yang list therefore \"%s\" must be specified",
144 logName(), appConfigBindingClassName, LIST_KEY_VALUE));
148 bindingContext = ListBindingContext.newInstance(appConfigBindingClass, appConfigListKeyValue);
149 } catch(Exception e) {
150 throw new ComponentDefinitionException(String.format(
151 "%s: Error initializing for app config list binding class %s",
152 logName(), appConfigBindingClassName), e);
156 bindingContext = new ContainerBindingContext(appConfigBindingClass);
161 public Object create() throws ComponentDefinitionException {
162 LOG.debug("{}: In create - currentAppConfig: {}", logName(), currentAppConfig);
166 return currentAppConfig;
170 protected void startTracking() {
171 // First get the BindingNormalizedNodeSerializer OSGi service. This will be used to create a default
172 // instance of the app config binding class, if necessary.
174 retrieveService("binding-codec", BindingNormalizedNodeSerializer.class, service -> {
175 bindingSerializer = (BindingNormalizedNodeSerializer)service;
176 retrieveDataBrokerService();
180 private void retrieveDataBrokerService() {
181 LOG.debug("{}: In retrieveDataBrokerService", logName());
183 // Get the binding DataBroker OSGi service.
185 retrieveService("data-broker", DataBroker.class, service -> retrieveInitialAppConfig((DataBroker)service));
188 private void retrieveInitialAppConfig(DataBroker dataBroker) {
189 LOG.debug("{}: Got DataBroker instance - reading app config {}", logName(), bindingContext.appConfigPath);
191 setDependendencyDesc("Initial app config " + bindingContext.appConfigBindingClass.getSimpleName());
193 // We register a DTCL to get updates and also read the app config data from the data store. If
194 // the app config data is present then both the read and initial DTCN update will return it. If the
195 // the data isn't present, we won't get an initial DTCN update so the read will indicate the data
198 DataTreeIdentifier<DataObject> dataTreeId = new DataTreeIdentifier<>(LogicalDatastoreType.CONFIGURATION,
199 bindingContext.appConfigPath);
200 appConfigChangeListenerReg = dataBroker.registerDataTreeChangeListener(dataTreeId,
201 new ClusteredDataTreeChangeListener<DataObject>() {
203 public void onDataTreeChanged(Collection<DataTreeModification<DataObject>> changes) {
204 onAppConfigChanged(changes);
208 readInitialAppConfig(dataBroker);
211 private void readInitialAppConfig(final DataBroker dataBroker) {
213 final ReadOnlyTransaction readOnlyTx = dataBroker.newReadOnlyTransaction();
214 CheckedFuture<Optional<DataObject>, ReadFailedException> future = readOnlyTx.read(
215 LogicalDatastoreType.CONFIGURATION, bindingContext.appConfigPath);
216 Futures.addCallback(future, new FutureCallback<Optional<DataObject>>() {
218 public void onSuccess(Optional<DataObject> possibleAppConfig) {
219 LOG.debug("{}: Read of app config {} succeeded: {}", logName(), bindingContext.appConfigBindingClass.getName(),
223 setInitialAppConfig(possibleAppConfig);
227 public void onFailure(Throwable t) {
230 // We may have gotten the app config via the data tree change listener so only retry if not.
231 if(readingInitialAppConfig.get()) {
232 LOG.warn("{}: Read of app config {} failed - retrying", logName(),
233 bindingContext.appConfigBindingClass.getName(), t);
235 readInitialAppConfig(dataBroker);
241 private void onAppConfigChanged(Collection<DataTreeModification<DataObject>> changes) {
242 for(DataTreeModification<DataObject> change: changes) {
243 DataObjectModification<DataObject> changeRoot = change.getRootNode();
244 ModificationType type = changeRoot.getModificationType();
246 LOG.debug("{}: onAppConfigChanged: {}, {}", logName(), type, change.getRootPath());
248 if(type == ModificationType.SUBTREE_MODIFIED || type == ModificationType.WRITE) {
249 DataObject newAppConfig = changeRoot.getDataAfter();
251 LOG.debug("New app config instance: {}, previous: {}", newAppConfig, currentAppConfig);
253 if(!setInitialAppConfig(Optional.of(newAppConfig)) &&
254 !Objects.equals(currentAppConfig, newAppConfig)) {
255 LOG.debug("App config was updated");
257 if(appConfigUpdateStrategy == UpdateStrategy.RELOAD) {
261 } else if(type == ModificationType.DELETE) {
262 LOG.debug("App config was deleted");
264 if(appConfigUpdateStrategy == UpdateStrategy.RELOAD) {
271 private boolean setInitialAppConfig(Optional<DataObject> possibleAppConfig) {
272 boolean result = readingInitialAppConfig.compareAndSet(true, false);
274 DataObject localAppConfig;
275 if(possibleAppConfig.isPresent()) {
276 localAppConfig = possibleAppConfig.get();
278 // No app config data is present so create an empty instance via the bindingSerializer service.
279 // This will also return default values for leafs that haven't been explicitly set.
280 localAppConfig = createDefaultInstance();
283 LOG.debug("{}: Setting currentAppConfig instance: {}", logName(), localAppConfig);
285 // Now publish the app config instance to the volatile field and notify the callback to let the
286 // container know our dependency is now satisfied.
287 currentAppConfig = localAppConfig;
294 private DataObject createDefaultInstance() {
295 YangInstanceIdentifier yangPath = bindingSerializer.toYangInstanceIdentifier(bindingContext.appConfigPath);
297 LOG.debug("{}: Creating app config instance from path {}, Qname: {}", logName(), yangPath, bindingContext.bindingQName);
299 SchemaService schemaService = getOSGiService(SchemaService.class);
300 if(schemaService == null) {
301 setFailureMessage(String.format("%s: Could not obtain the SchemaService OSGi service", logName()));
305 SchemaContext schemaContext = schemaService.getGlobalContext();
307 Module module = schemaContext.findModuleByNamespaceAndRevision(bindingContext.bindingQName.getNamespace(),
308 bindingContext.bindingQName.getRevision());
310 setFailureMessage(String.format("%s: Could not obtain the module schema for namespace %s, revision %s",
311 logName(), bindingContext.bindingQName.getNamespace(), bindingContext.bindingQName.getRevision()));
315 DataSchemaNode dataSchema = module.getDataChildByName(bindingContext.bindingQName);
316 if(dataSchema == null) {
317 setFailureMessage(String.format("%s: Could not obtain the schema for %s", logName(), bindingContext.bindingQName));
321 if(!bindingContext.schemaType.isAssignableFrom(dataSchema.getClass())) {
322 setFailureMessage(String.format("%s: Expected schema type %s for %s but actual type is %s", logName(),
323 bindingContext.schemaType, bindingContext.bindingQName, dataSchema.getClass()));
327 NormalizedNode<?, ?> dataNode = parsePossibleDefaultAppConfigXMLFile(schemaContext, dataSchema);
328 if(dataNode == null) {
329 dataNode = parsePossibleDefaultAppConfigElement(schemaContext, dataSchema);
332 if(dataNode == null) {
333 dataNode = bindingContext.newDefaultNode(dataSchema);
336 DataObject appConfig = bindingSerializer.fromNormalizedNode(yangPath, dataNode).getValue();
338 if(appConfig == null) {
339 // This shouldn't happen but need to handle it in case...
340 setFailureMessage(String.format("%s: Could not create instance for app config binding %s",
341 logName(), bindingContext.appConfigBindingClass));
347 private NormalizedNode<?, ?> parsePossibleDefaultAppConfigXMLFile(SchemaContext schemaContext,
348 DataSchemaNode dataSchema) {
350 String appConfigFileName = defaultAppConfigFileName;
351 if(Strings.isNullOrEmpty(appConfigFileName)) {
352 String moduleName = findYangModuleName(bindingContext.bindingQName, schemaContext);
353 if(moduleName == null) {
357 appConfigFileName = moduleName + "_" + bindingContext.bindingQName.getLocalName() + ".xml";
360 File appConfigFile = new File(DEFAULT_APP_CONFIG_FILE_PATH, appConfigFileName);
362 LOG.debug("{}: parsePossibleDefaultAppConfigXMLFile looking for file {}", logName(),
363 appConfigFile.getAbsolutePath());
365 if(!appConfigFile.exists()) {
369 LOG.debug("{}: Found file {}", logName(), appConfigFile.getAbsolutePath());
371 DomToNormalizedNodeParserFactory parserFactory = DomToNormalizedNodeParserFactory.getInstance(
372 XmlUtils.DEFAULT_XML_CODEC_PROVIDER, schemaContext);
374 try(FileInputStream fis = new FileInputStream(appConfigFile)) {
375 Document root = DOC_BUILDER_FACTORY.newDocumentBuilder().parse(fis);
376 NormalizedNode<?, ?> dataNode = bindingContext.parseDataElement(root.getDocumentElement(), dataSchema,
379 LOG.debug("{}: Parsed data node: {}", logName(), dataNode);
382 } catch (Exception e) {
383 setFailureMessage(String.format("%s: Could not read/parse app config file %s", logName(), appConfigFile));
389 private String findYangModuleName(QName qname, SchemaContext schemaContext) {
390 for(Module m: schemaContext.getModules()) {
391 if(qname.getModule().equals(m.getQNameModule())) {
396 setFailureMessage(String.format("%s: Could not find yang module for QName %s", logName(), qname));
401 private NormalizedNode<?, ?> parsePossibleDefaultAppConfigElement(SchemaContext schemaContext,
402 DataSchemaNode dataSchema) {
403 if(defaultAppConfigElement == null) {
407 LOG.debug("{}: parsePossibleDefaultAppConfigElement for {}", logName(), bindingContext.bindingQName);
409 DomToNormalizedNodeParserFactory parserFactory = DomToNormalizedNodeParserFactory.getInstance(
410 XmlUtils.DEFAULT_XML_CODEC_PROVIDER, schemaContext);
413 LOG.debug("{}: Got app config schema: {}", logName(), dataSchema);
415 NormalizedNode<?, ?> dataNode = bindingContext.parseDataElement(defaultAppConfigElement, dataSchema,
418 LOG.debug("{}: Parsed data node: {}", logName(), dataNode);
425 public void destroy(Object instance) {
426 super.destroy(instance);
428 if(appConfigChangeListenerReg != null) {
429 appConfigChangeListenerReg.close();
430 appConfigChangeListenerReg = null;
435 * Internal base class to abstract binding type-specific behavior.
437 private static abstract class BindingContext {
438 final InstanceIdentifier<DataObject> appConfigPath;
439 final Class<DataObject> appConfigBindingClass;
440 final Class<? extends DataSchemaNode> schemaType;
441 final QName bindingQName;
443 protected BindingContext(Class<DataObject> appConfigBindingClass, InstanceIdentifier<DataObject> appConfigPath,
444 Class<? extends DataSchemaNode> schemaType) {
445 this.appConfigBindingClass = appConfigBindingClass;
446 this.appConfigPath = appConfigPath;
447 this.schemaType = schemaType;
449 bindingQName = BindingReflections.findQName(appConfigBindingClass);
452 abstract NormalizedNode<?, ?> parseDataElement(Element element, DataSchemaNode dataSchema,
453 DomToNormalizedNodeParserFactory parserFactory);
455 abstract NormalizedNode<?, ?> newDefaultNode(DataSchemaNode dataSchema);
459 * BindingContext implementation for a container binding.
461 private static class ContainerBindingContext extends BindingContext {
462 ContainerBindingContext(Class<DataObject> appConfigBindingClass) {
463 super(appConfigBindingClass, InstanceIdentifier.create(appConfigBindingClass), ContainerSchemaNode.class);
467 NormalizedNode<?, ?> newDefaultNode(DataSchemaNode dataSchema) {
468 return ImmutableNodes.containerNode(bindingQName);
472 NormalizedNode<?, ?> parseDataElement(Element element, DataSchemaNode dataSchema,
473 DomToNormalizedNodeParserFactory parserFactory) {
474 return parserFactory.getContainerNodeParser().parse(Collections.singletonList(element),
475 (ContainerSchemaNode)dataSchema);
480 * BindingContext implementation for a list binding.
482 private static class ListBindingContext extends BindingContext {
483 final String appConfigListKeyValue;
485 ListBindingContext(Class<DataObject> appConfigBindingClass, InstanceIdentifier<DataObject> appConfigPath,
486 String appConfigListKeyValue) {
487 super(appConfigBindingClass, appConfigPath, ListSchemaNode.class);
488 this.appConfigListKeyValue = appConfigListKeyValue;
491 @SuppressWarnings({ "rawtypes", "unchecked" })
492 private static ListBindingContext newInstance(Class<DataObject> bindingClass, String listKeyValue)
494 // We assume the yang list key type is string.
495 Identifier keyInstance = (Identifier) bindingClass.getMethod("getKey").getReturnType().
496 getConstructor(String.class).newInstance(listKeyValue);
497 InstanceIdentifier appConfigPath = InstanceIdentifier.builder((Class)bindingClass, keyInstance).build();
498 return new ListBindingContext(bindingClass, appConfigPath, listKeyValue);
502 NormalizedNode<?, ?> newDefaultNode(DataSchemaNode dataSchema) {
503 // We assume there's only one key for the list.
504 List<QName> keys = ((ListSchemaNode)dataSchema).getKeyDefinition();
505 Preconditions.checkArgument(keys.size() == 1, "Expected only 1 key for list %s", appConfigBindingClass);
506 QName listKeyQName = keys.iterator().next();
507 return ImmutableNodes.mapEntryBuilder(bindingQName, listKeyQName, appConfigListKeyValue).build();
511 NormalizedNode<?, ?> parseDataElement(Element element, DataSchemaNode dataSchema,
512 DomToNormalizedNodeParserFactory parserFactory) {
513 return parserFactory.getMapEntryNodeParser().parse(Collections.singletonList(element),
514 (ListSchemaNode)dataSchema);