opendaylight/config/config-manager/src/main/java/org/opendaylight/controller/config/manager/impl/ConfigRegistryImpl.java

   1 /*
   2  * Copyright (c) 2013 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.controller.config.manager.impl;
   9
  10 import com.google.common.collect.Maps;
  11 import java.util.ArrayList;
  12 import java.util.Collection;
  13 import java.util.Collections;
  14 import java.util.HashMap;
  15 import java.util.Iterator;
  16 import java.util.LinkedList;
  17 import java.util.List;
  18 import java.util.Map;
  19 import java.util.Map.Entry;
  20 import java.util.Set;
  21 import javax.annotation.concurrent.GuardedBy;
  22 import javax.annotation.concurrent.NotThreadSafe;
  23 import javax.annotation.concurrent.ThreadSafe;
  24 import javax.management.InstanceAlreadyExistsException;
  25 import javax.management.InstanceNotFoundException;
  26 import javax.management.MBeanServer;
  27 import javax.management.MBeanServerFactory;
  28 import javax.management.ObjectName;
  29 import org.opendaylight.controller.config.api.ConflictingVersionException;
  30 import org.opendaylight.controller.config.api.ModuleIdentifier;
  31 import org.opendaylight.controller.config.api.RuntimeBeanRegistratorAwareModule;
  32 import org.opendaylight.controller.config.api.ValidationException;
  33 import org.opendaylight.controller.config.api.annotations.ServiceInterfaceAnnotation;
  34 import org.opendaylight.controller.config.api.jmx.CommitStatus;
  35 import org.opendaylight.controller.config.api.jmx.ObjectNameUtil;
  36 import org.opendaylight.controller.config.manager.impl.dependencyresolver.DestroyedModule;
  37 import org.opendaylight.controller.config.manager.impl.dependencyresolver.ModuleInternalTransactionalInfo;
  38 import org.opendaylight.controller.config.manager.impl.dynamicmbean.DynamicReadableWrapper;
  39 import org.opendaylight.controller.config.manager.impl.factoriesresolver.HierarchicalConfigMBeanFactoriesHolder;
  40 import org.opendaylight.controller.config.manager.impl.factoriesresolver.ModuleFactoriesResolver;
  41 import org.opendaylight.controller.config.manager.impl.jmx.BaseJMXRegistrator;
  42 import org.opendaylight.controller.config.manager.impl.jmx.ModuleJMXRegistrator;
  43 import org.opendaylight.controller.config.manager.impl.jmx.RootRuntimeBeanRegistratorImpl;
  44 import org.opendaylight.controller.config.manager.impl.jmx.TransactionJMXRegistrator;
  45 import org.opendaylight.controller.config.manager.impl.osgi.BeanToOsgiServiceManager;
  46 import org.opendaylight.controller.config.manager.impl.osgi.BeanToOsgiServiceManager.OsgiRegistration;
  47 import org.opendaylight.controller.config.manager.impl.util.LookupBeansUtil;
  48 import org.opendaylight.controller.config.manager.impl.util.ModuleQNameUtil;
  49 import org.opendaylight.controller.config.spi.Module;
  50 import org.opendaylight.controller.config.spi.ModuleFactory;
  51 import org.opendaylight.yangtools.yang.data.impl.codec.CodecRegistry;
  52 import org.osgi.framework.BundleContext;
  53 import org.slf4j.Logger;
  54 import org.slf4j.LoggerFactory;
  55
  56 /**
  57  * Singleton that is responsible for creating and committing Config
  58  * Transactions. It is registered in Platform MBean Server.
  59  */
  60 @ThreadSafe
  61 public class ConfigRegistryImpl implements AutoCloseable, ConfigRegistryImplMXBean {
  62     private static final Logger LOG = LoggerFactory.getLogger(ConfigRegistryImpl.class);
  63
  64     private final ModuleFactoriesResolver resolver;
  65     private final MBeanServer configMBeanServer;
  66     private final CodecRegistry codecRegistry;
  67
  68     @GuardedBy("this")
  69     private long version = 0;
  70     @GuardedBy("this")
  71     private long versionCounter = 0;
  72
  73     /**
  74      * Contains current configuration in form of {moduleName:{instanceName,read
  75      * only module}} for copying state to new transaction. Each running module
  76      * is present just once, no matter how many interfaces it exposes.
  77      */
  78     @GuardedBy("this")
  79     private final ConfigHolder currentConfig = new ConfigHolder();
  80
  81     /**
  82      * Will return true unless there was a transaction that succeeded during
  83      * validation but failed in second phase of commit. In this case the server
  84      * is unstable and its state is undefined.
  85      */
  86     @GuardedBy("this")
  87     private boolean isHealthy = true;
  88
  89     /**
  90      * Holds Map<transactionName, transactionController> and purges it each time
  91      * its content is requested.
  92      */
  93     @GuardedBy("this")
  94     private final TransactionsHolder transactionsHolder = new TransactionsHolder();
  95
  96     private final BaseJMXRegistrator baseJMXRegistrator;
  97
  98     private final BeanToOsgiServiceManager beanToOsgiServiceManager;
  99
 100     // internal jmx server for read only beans
 101     private final MBeanServer registryMBeanServer;
 102     // internal jmx server shared by all transactions
 103     private final MBeanServer transactionsMBeanServer;
 104
 105     // Used for finding new factory instances for default module functionality
 106     @GuardedBy("this")
 107     private List<ModuleFactory> lastListOfFactories = Collections.emptyList();
 108
 109     @GuardedBy("this") // switched in every 2ndPC
 110     private CloseableServiceReferenceReadableRegistry readableSRRegistry = ServiceReferenceRegistryImpl.createInitialSRLookupRegistry();
 111
 112     // constructor
 113     public ConfigRegistryImpl(ModuleFactoriesResolver resolver,
 114                               MBeanServer configMBeanServer, CodecRegistry codecRegistry) {
 115         this(resolver, configMBeanServer,
 116                 new BaseJMXRegistrator(configMBeanServer), codecRegistry);
 117     }
 118
 119     // constructor
 120     public ConfigRegistryImpl(ModuleFactoriesResolver resolver,
 121                               MBeanServer configMBeanServer,
 122                               BaseJMXRegistrator baseJMXRegistrator, CodecRegistry codecRegistry) {
 123         this.resolver = resolver;
 124         this.beanToOsgiServiceManager = new BeanToOsgiServiceManager();
 125         this.configMBeanServer = configMBeanServer;
 126         this.baseJMXRegistrator = baseJMXRegistrator;
 127         this.codecRegistry = codecRegistry;
 128         this.registryMBeanServer = MBeanServerFactory
 129                 .createMBeanServer("ConfigRegistry" + configMBeanServer.getDefaultDomain());
 130         this.transactionsMBeanServer = MBeanServerFactory
 131                 .createMBeanServer("ConfigTransactions" + configMBeanServer.getDefaultDomain());
 132     }
 133
 134     /**
 135      * Create new {@link ConfigTransactionControllerImpl }
 136      */
 137     @Override
 138     public synchronized ObjectName beginConfig() {
 139         return beginConfig(false);
 140     }
 141
 142     /**
 143      * @param blankTransaction true if this transaction is created automatically by
 144      *                         org.opendaylight.controller.config.manager.impl.osgi.BlankTransactionServiceTracker
 145      */
 146     public synchronized ObjectName beginConfig(boolean blankTransaction) {
 147         return beginConfigInternal(blankTransaction).getControllerObjectName();
 148     }
 149
 150     private synchronized ConfigTransactionControllerInternal beginConfigInternal(boolean blankTransaction) {
 151         versionCounter++;
 152         final String transactionName = "ConfigTransaction-" + version + "-" + versionCounter;
 153
 154         TransactionJMXRegistratorFactory factory = new TransactionJMXRegistratorFactory() {
 155             @Override
 156             public TransactionJMXRegistrator create() {
 157                 return baseJMXRegistrator.createTransactionJMXRegistrator(transactionName);
 158             }
 159         };
 160
 161         Map<String, Map.Entry<ModuleFactory, BundleContext>> allCurrentFactories = new HashMap<>(
 162                 resolver.getAllFactories());
 163
 164         // add all factories that disappeared from SR but are still committed
 165         for (ModuleInternalInfo moduleInternalInfo : currentConfig.getEntries()) {
 166             String name = moduleInternalInfo.getModuleFactory().getImplementationName();
 167             if (allCurrentFactories.containsKey(name) == false) {
 168                 LOG.trace("Factory {} not found in SR, using reference from previous commit", name);
 169                 allCurrentFactories.put(name,
 170                         Maps.immutableEntry(moduleInternalInfo.getModuleFactory(), moduleInternalInfo.getBundleContext()));
 171             }
 172         }
 173         allCurrentFactories = Collections.unmodifiableMap(allCurrentFactories);
 174
 175         // closed by transaction controller
 176         ConfigTransactionLookupRegistry txLookupRegistry = new ConfigTransactionLookupRegistry(new TransactionIdentifier(
 177                 transactionName), factory, allCurrentFactories);
 178         SearchableServiceReferenceWritableRegistry writableRegistry = ServiceReferenceRegistryImpl.createSRWritableRegistry(
 179                 readableSRRegistry, txLookupRegistry, allCurrentFactories);
 180
 181         ConfigTransactionControllerInternal transactionController = new ConfigTransactionControllerImpl(
 182                 txLookupRegistry, version, codecRegistry,
 183                 versionCounter, allCurrentFactories, transactionsMBeanServer,
 184                 configMBeanServer, blankTransaction, writableRegistry);
 185         try {
 186             txLookupRegistry.registerMBean(transactionController, transactionController.getControllerObjectName());
 187         } catch (InstanceAlreadyExistsException e) {
 188             throw new IllegalStateException(e);
 189         }
 190         transactionController.copyExistingModulesAndProcessFactoryDiff(currentConfig.getEntries(), lastListOfFactories);
 191         transactionsHolder.add(transactionName, transactionController, txLookupRegistry);
 192         return transactionController;
 193     }
 194
 195     /**
 196      * {@inheritDoc}
 197      */
 198     @Override
 199     public synchronized CommitStatus commitConfig(ObjectName transactionControllerON)
 200             throws ConflictingVersionException, ValidationException {
 201         final String transactionName = ObjectNameUtil
 202                 .getTransactionName(transactionControllerON);
 203         LOG.trace("About to commit {}. Current parentVersion: {}, versionCounter {}", transactionName, version, versionCounter);
 204
 205         // find ConfigTransactionController
 206         Map<String, Entry<ConfigTransactionControllerInternal, ConfigTransactionLookupRegistry>> transactions = transactionsHolder.getCurrentTransactions();
 207         Entry<ConfigTransactionControllerInternal, ConfigTransactionLookupRegistry> configTransactionControllerEntry = transactions.get(transactionName);
 208         if (configTransactionControllerEntry == null) {
 209             throw new IllegalArgumentException(String.format(
 210                     "Transaction with name '%s' not found", transactionName));
 211         }
 212         ConfigTransactionControllerInternal configTransactionController = configTransactionControllerEntry.getKey();
 213         // check optimistic lock
 214         if (version != configTransactionController.getParentVersion()) {
 215             throw new ConflictingVersionException(
 216                     String.format(
 217                             "Optimistic lock failed. Expected parent version %d, was %d",
 218                             version,
 219                             configTransactionController.getParentVersion()));
 220         }
 221         // optimistic lock ok
 222
 223         CommitInfo commitInfo = configTransactionController.validateBeforeCommitAndLockTransaction();
 224         lastListOfFactories = Collections.unmodifiableList(configTransactionController.getCurrentlyRegisteredFactories());
 225         // non recoverable from here:
 226         try {
 227             return secondPhaseCommit(configTransactionController, commitInfo, configTransactionControllerEntry.getValue());
 228         } catch (Error | RuntimeException t) { // some libs throw Errors: e.g.
 229             // javax.xml.ws.spi.FactoryFinder$ConfigurationError
 230             isHealthy = false;
 231             LOG.error("Configuration Transaction failed on 2PC, server is unhealthy", t);
 232             if (t instanceof RuntimeException) {
 233                 throw (RuntimeException) t;
 234             } else {
 235                 throw (Error) t;
 236             }
 237         }
 238     }
 239
 240     private CommitStatus secondPhaseCommit(ConfigTransactionControllerInternal configTransactionController,
 241                                            CommitInfo commitInfo, ConfigTransactionLookupRegistry txLookupRegistry) {
 242
 243         // close instances which were destroyed by the user, including
 244         // (hopefully) runtime beans
 245         for (DestroyedModule toBeDestroyed : commitInfo
 246                 .getDestroyedFromPreviousTransactions()) {
 247             toBeDestroyed.close(); // closes instance (which should close
 248             // runtime jmx registrator),
 249             // also closes osgi registration and ModuleJMXRegistrator
 250             // registration
 251             currentConfig.remove(toBeDestroyed.getIdentifier());
 252         }
 253
 254         // set RuntimeBeanRegistrators on beans implementing
 255         // RuntimeBeanRegistratorAwareModule, each module
 256         // should have exactly one runtime jmx registrator.
 257         Map<ModuleIdentifier, RootRuntimeBeanRegistratorImpl> runtimeRegistrators = new HashMap<>();
 258         for (ModuleInternalTransactionalInfo entry : commitInfo.getCommitted()
 259                 .values()) {
 260             RootRuntimeBeanRegistratorImpl runtimeBeanRegistrator;
 261             if (entry.hasOldModule() == false) {
 262                 runtimeBeanRegistrator = baseJMXRegistrator
 263                         .createRuntimeBeanRegistrator(entry.getIdentifier());
 264             } else {
 265                 // reuse old JMX registrator
 266                 runtimeBeanRegistrator = entry.getOldInternalInfo()
 267                         .getRuntimeBeanRegistrator();
 268             }
 269             // set runtime jmx registrator if required
 270             Module module = entry.getProxiedModule();
 271             if (module instanceof RuntimeBeanRegistratorAwareModule) {
 272                 ((RuntimeBeanRegistratorAwareModule) module)
 273                         .setRuntimeBeanRegistrator(runtimeBeanRegistrator);
 274             }
 275             // save it to info so it is accessible afterwards
 276             runtimeRegistrators.put(entry.getIdentifier(), runtimeBeanRegistrator);
 277         }
 278
 279         // can register runtime beans
 280         List<ModuleIdentifier> orderedModuleIdentifiers = configTransactionController.secondPhaseCommit();
 281         txLookupRegistry.close();
 282         configTransactionController.close();
 283
 284         // copy configuration to read only mode
 285         List<ObjectName> newInstances = new LinkedList<>();
 286         List<ObjectName> reusedInstances = new LinkedList<>();
 287         List<ObjectName> recreatedInstances = new LinkedList<>();
 288
 289         Map<Module, ModuleInternalInfo> newConfigEntries = new HashMap<>();
 290
 291         int orderingIdx = 0;
 292         for (ModuleIdentifier moduleIdentifier : orderedModuleIdentifiers) {
 293             LOG.trace("Registering {}", moduleIdentifier);
 294             ModuleInternalTransactionalInfo entry = commitInfo.getCommitted()
 295                     .get(moduleIdentifier);
 296             if (entry == null) {
 297                 throw new NullPointerException("Module not found "
 298                         + moduleIdentifier);
 299             }
 300
 301             ObjectName primaryReadOnlyON = ObjectNameUtil
 302                     .createReadOnlyModuleON(moduleIdentifier);
 303
 304             // determine if current instance was recreated or reused or is new
 305
 306             // rules for closing resources:
 307             // osgi registration - will be reused if possible.
 308             // module jmx registration - will be (re)created every time, needs
 309             // to be closed here
 310             // runtime jmx registration - should be taken care of by module
 311             // itself
 312             // instance - is closed only if it was destroyed
 313             ModuleJMXRegistrator newModuleJMXRegistrator = baseJMXRegistrator
 314                     .createModuleJMXRegistrator();
 315
 316             OsgiRegistration osgiRegistration = null;
 317             AutoCloseable instance = entry.getProxiedModule().getInstance();
 318             if (entry.hasOldModule()) {
 319                 ModuleInternalInfo oldInternalInfo = entry.getOldInternalInfo();
 320                 DynamicReadableWrapper oldReadableConfigBean = oldInternalInfo.getReadableModule();
 321                 currentConfig.remove(entry.getIdentifier());
 322
 323                 // test if old instance == new instance
 324                 if (oldReadableConfigBean.getInstance().equals(instance)) {
 325                     // reused old instance:
 326                     // wrap in readable dynamic mbean
 327                     reusedInstances.add(primaryReadOnlyON);
 328                     osgiRegistration = oldInternalInfo.getOsgiRegistration();
 329                 } else {
 330                     // recreated instance:
 331                     // it is responsibility of module to call the old instance -
 332                     // we just need to unregister configbean
 333                     recreatedInstances.add(primaryReadOnlyON);
 334
 335                     // close old osgi registration
 336                     oldInternalInfo.getOsgiRegistration().close();
 337                 }
 338
 339                 // close old module jmx registrator
 340                 oldInternalInfo.getModuleJMXRegistrator().close();
 341             } else {
 342                 // new instance:
 343                 // wrap in readable dynamic mbean
 344                 newInstances.add(primaryReadOnlyON);
 345             }
 346             Module realModule = entry.getRealModule();
 347
 348             DynamicReadableWrapper newReadableConfigBean = new DynamicReadableWrapper(
 349                     realModule, instance, moduleIdentifier,
 350                     registryMBeanServer, configMBeanServer);
 351
 352             // register to JMX
 353             try {
 354                 newModuleJMXRegistrator.registerMBean(newReadableConfigBean, primaryReadOnlyON);
 355             } catch (InstanceAlreadyExistsException e) {
 356                 throw new IllegalStateException("Possible code error, already registered:" + primaryReadOnlyON,e);
 357             }
 358
 359             // register services to OSGi
 360             Map<ServiceInterfaceAnnotation, String /* service ref name */> annotationMapping = configTransactionController.getWritableRegistry().findServiceInterfaces(moduleIdentifier);
 361             BundleContext bc = configTransactionController.getModuleFactoryBundleContext(
 362                     entry.getModuleFactory().getImplementationName());
 363             if (osgiRegistration == null) {
 364                 osgiRegistration = beanToOsgiServiceManager.registerToOsgi(
 365                         newReadableConfigBean.getInstance(), moduleIdentifier, bc, annotationMapping);
 366             } else {
 367                 osgiRegistration.updateRegistrations(annotationMapping, bc, instance);
 368             }
 369
 370             RootRuntimeBeanRegistratorImpl runtimeBeanRegistrator = runtimeRegistrators
 371                     .get(entry.getIdentifier());
 372             ModuleInternalInfo newInfo = new ModuleInternalInfo(
 373                     entry.getIdentifier(), newReadableConfigBean, osgiRegistration,
 374                     runtimeBeanRegistrator, newModuleJMXRegistrator,
 375                     orderingIdx, entry.isDefaultBean(), entry.getModuleFactory(), entry.getBundleContext());
 376
 377             newConfigEntries.put(realModule, newInfo);
 378             orderingIdx++;
 379         }
 380         currentConfig.addAll(newConfigEntries.values());
 381
 382         // update version
 383         version = configTransactionController.getVersion();
 384
 385         // switch readable Service Reference Registry
 386         this.readableSRRegistry.close();
 387         this.readableSRRegistry = ServiceReferenceRegistryImpl.createSRReadableRegistry(
 388                 configTransactionController.getWritableRegistry(), this, baseJMXRegistrator);
 389
 390         return new CommitStatus(newInstances, reusedInstances,
 391                 recreatedInstances);
 392     }
 393
 394     /**
 395      * {@inheritDoc}
 396      */
 397     @Override
 398     public synchronized List<ObjectName> getOpenConfigs() {
 399         Map<String, Entry<ConfigTransactionControllerInternal, ConfigTransactionLookupRegistry>> transactions = transactionsHolder
 400                 .getCurrentTransactions();
 401         List<ObjectName> result = new ArrayList<>(transactions.size());
 402         for (Entry<ConfigTransactionControllerInternal, ConfigTransactionLookupRegistry> configTransactionControllerEntry : transactions
 403                 .values()) {
 404             result.add(configTransactionControllerEntry.getKey().getControllerObjectName());
 405         }
 406         return result;
 407     }
 408
 409     /**
 410      * Abort open transactions and unregister read only modules. Since this
 411      * class is not responsible for registering itself under
 412      * {@link org.opendaylight.controller.config.api.ConfigRegistry#OBJECT_NAME}, it will not unregister itself
 413      * here.
 414      */
 415     @Override
 416     public synchronized void close() {
 417         // abort transactions
 418         Map<String, Entry<ConfigTransactionControllerInternal, ConfigTransactionLookupRegistry>> transactions = transactionsHolder
 419                 .getCurrentTransactions();
 420         for (Entry<ConfigTransactionControllerInternal, ConfigTransactionLookupRegistry> configTransactionControllerEntry : transactions
 421                 .values()) {
 422
 423             ConfigTransactionControllerInternal configTransactionController = configTransactionControllerEntry.getKey();
 424             try {
 425                 configTransactionControllerEntry.getValue().close();
 426                 configTransactionController.abortConfig();
 427             } catch (RuntimeException e) {
 428                 LOG.warn("Ignoring exception while aborting {}",
 429                         configTransactionController, e);
 430             }
 431         }
 432
 433         // destroy all live objects one after another in order of the dependency
 434         // hierarchy
 435         List<DestroyedModule> destroyedModules = currentConfig
 436                 .getModulesToBeDestroyed();
 437         for (DestroyedModule destroyedModule : destroyedModules) {
 438             destroyedModule.close();
 439         }
 440         // unregister MBeans that failed to unregister properly
 441         baseJMXRegistrator.close();
 442         // remove jmx servers
 443         MBeanServerFactory.releaseMBeanServer(registryMBeanServer);
 444         MBeanServerFactory.releaseMBeanServer(transactionsMBeanServer);
 445
 446     }
 447
 448     /**
 449      * {@inheritDoc}
 450      */
 451     @Override
 452     public long getVersion() {
 453         return version;
 454     }
 455
 456     /**
 457      * {@inheritDoc}
 458      */
 459     @Override
 460     public Set<String> getAvailableModuleNames() {
 461         return new HierarchicalConfigMBeanFactoriesHolder(
 462                 resolver.getAllFactories()).getModuleNames();
 463     }
 464
 465     /**
 466      * {@inheritDoc}
 467      */
 468     @Override
 469     public boolean isHealthy() {
 470         return isHealthy;
 471     }
 472
 473     // filtering methods
 474
 475     /**
 476      * {@inheritDoc}
 477      */
 478     @Override
 479     public Set<ObjectName> lookupConfigBeans() {
 480         return lookupConfigBeans("*", "*");
 481     }
 482
 483     /**
 484      * {@inheritDoc}
 485      */
 486     @Override
 487     public Set<ObjectName> lookupConfigBeans(String moduleName) {
 488         return lookupConfigBeans(moduleName, "*");
 489     }
 490
 491     /**
 492      * {@inheritDoc}
 493      */
 494     @Override
 495     public ObjectName lookupConfigBean(String moduleName, String instanceName)
 496             throws InstanceNotFoundException {
 497         return LookupBeansUtil.lookupConfigBean(this, moduleName, instanceName);
 498     }
 499
 500     /**
 501      * {@inheritDoc}
 502      */
 503     @Override
 504     public Set<ObjectName> lookupConfigBeans(String moduleName,
 505                                              String instanceName) {
 506         ObjectName namePattern = ObjectNameUtil.createModulePattern(moduleName,
 507                 instanceName);
 508         return baseJMXRegistrator.queryNames(namePattern, null);
 509     }
 510
 511     /**
 512      * {@inheritDoc}
 513      */
 514     @Override
 515     public Set<ObjectName> lookupRuntimeBeans() {
 516         return lookupRuntimeBeans("*", "*");
 517     }
 518
 519     /**
 520      * {@inheritDoc}
 521      */
 522     @Override
 523     public Set<ObjectName> lookupRuntimeBeans(String moduleName,
 524                                               String instanceName) {
 525         String finalModuleName = moduleName == null ? "*" : moduleName;
 526         String finalInstanceName = instanceName == null ? "*" : instanceName;
 527         ObjectName namePattern = ObjectNameUtil.createRuntimeBeanPattern(
 528                 finalModuleName, finalInstanceName);
 529         return baseJMXRegistrator.queryNames(namePattern, null);
 530     }
 531
 532     @Override
 533     public void checkConfigBeanExists(ObjectName objectName) throws InstanceNotFoundException {
 534         ObjectNameUtil.checkDomain(objectName);
 535         ObjectNameUtil.checkType(objectName, ObjectNameUtil.TYPE_MODULE);
 536         String transactionName = ObjectNameUtil.getTransactionName(objectName);
 537         if (transactionName != null) {
 538             throw new IllegalArgumentException("Transaction attribute not supported in registry, wrong ObjectName: " + objectName);
 539         }
 540         // make sure exactly one match is found:
 541         LookupBeansUtil.lookupConfigBean(this, ObjectNameUtil.getFactoryName(objectName), ObjectNameUtil.getInstanceName(objectName));
 542     }
 543
 544     // service reference functionality:
 545     @Override
 546     public synchronized ObjectName lookupConfigBeanByServiceInterfaceName(String serviceInterfaceQName, String refName) {
 547         return readableSRRegistry.lookupConfigBeanByServiceInterfaceName(serviceInterfaceQName, refName);
 548     }
 549
 550     @Override
 551     public synchronized Map<String, Map<String, ObjectName>> getServiceMapping() {
 552         return readableSRRegistry.getServiceMapping();
 553     }
 554
 555     @Override
 556     public synchronized Map<String, ObjectName> lookupServiceReferencesByServiceInterfaceName(String serviceInterfaceQName) {
 557         return readableSRRegistry.lookupServiceReferencesByServiceInterfaceName(serviceInterfaceQName);
 558     }
 559
 560     @Override
 561     public synchronized Set<String> lookupServiceInterfaceNames(ObjectName objectName) throws InstanceNotFoundException {
 562         return readableSRRegistry.lookupServiceInterfaceNames(objectName);
 563     }
 564
 565     @Override
 566     public synchronized String getServiceInterfaceName(String namespace, String localName) {
 567         return readableSRRegistry.getServiceInterfaceName(namespace, localName);
 568     }
 569
 570     @Override
 571     public void checkServiceReferenceExists(ObjectName objectName) throws InstanceNotFoundException {
 572         readableSRRegistry.checkServiceReferenceExists(objectName);
 573     }
 574
 575     @Override
 576     public ObjectName getServiceReference(String serviceInterfaceQName, String refName) throws InstanceNotFoundException {
 577         return readableSRRegistry.getServiceReference(serviceInterfaceQName, refName);
 578     }
 579
 580     @Override
 581     public Set<String> getAvailableModuleFactoryQNames() {
 582         return ModuleQNameUtil.getQNames(resolver.getAllFactories());
 583     }
 584
 585     @Override
 586     public String toString() {
 587         return "ConfigRegistryImpl{" +
 588                 "versionCounter=" + versionCounter +
 589                 ", version=" + version +
 590                 '}';
 591     }
 592 }
 593
 594 /**
 595  * Holds currently running modules
 596  */
 597 @NotThreadSafe
 598 class ConfigHolder {
 599     private final Map<ModuleIdentifier, ModuleInternalInfo> currentConfig = new HashMap<>();
 600
 601     /**
 602      * Add all modules to the internal map. Also add service instance to OSGi
 603      * Service Registry.
 604      */
 605     public void addAll(Collection<ModuleInternalInfo> configInfos) {
 606         if (!currentConfig.isEmpty()) {
 607             throw new IllegalStateException(
 608                     "Error - some config entries were not removed: "
 609                             + currentConfig);
 610         }
 611         for (ModuleInternalInfo configInfo : configInfos) {
 612             add(configInfo);
 613         }
 614     }
 615
 616     private void add(ModuleInternalInfo configInfo) {
 617         ModuleInternalInfo oldValue = currentConfig.put(configInfo.getIdentifier(),
 618                 configInfo);
 619         if (oldValue != null) {
 620             throw new IllegalStateException(
 621                     "Cannot overwrite module with same name:"
 622                             + configInfo.getIdentifier() + ":" + configInfo);
 623         }
 624     }
 625
 626     /**
 627      * Remove entry from current config.
 628      */
 629     public void remove(ModuleIdentifier name) {
 630         ModuleInternalInfo removed = currentConfig.remove(name);
 631         if (removed == null) {
 632             throw new IllegalStateException(
 633                     "Cannot remove from ConfigHolder - name not found:" + name);
 634         }
 635     }
 636
 637     public Collection<ModuleInternalInfo> getEntries() {
 638         return currentConfig.values();
 639     }
 640
 641     public List<DestroyedModule> getModulesToBeDestroyed() {
 642         List<DestroyedModule> result = new ArrayList<>();
 643         for (ModuleInternalInfo moduleInternalInfo : getEntries()) {
 644             result.add(moduleInternalInfo.toDestroyedModule());
 645         }
 646         Collections.sort(result);
 647         return result;
 648     }
 649
 650
 651 }
 652
 653 /**
 654  * Holds Map<transactionName, transactionController> and purges it each time its
 655  * content is requested.
 656  */
 657 @NotThreadSafe
 658 class TransactionsHolder {
 659     /**
 660      * This map keeps transaction names and
 661      * {@link ConfigTransactionControllerInternal} instances, because platform
 662      * MBeanServer transforms mbeans into another representation. Map is cleaned
 663      * every time current transactions are requested.
 664      */
 665     @GuardedBy("ConfigRegistryImpl.this")
 666     private final Map<String /* transactionName */,
 667             Entry<ConfigTransactionControllerInternal, ConfigTransactionLookupRegistry>> transactions = new HashMap<>();
 668
 669     /**
 670      * Can only be called from within synchronized method.
 671      */
 672     public void add(String transactionName,
 673                     ConfigTransactionControllerInternal transactionController, ConfigTransactionLookupRegistry txLookupRegistry) {
 674         Object oldValue = transactions.put(transactionName,
 675                 Maps.immutableEntry(transactionController, txLookupRegistry));
 676         if (oldValue != null) {
 677             throw new IllegalStateException(
 678                     "Error: two transactions with same name");
 679         }
 680     }
 681
 682     /**
 683      * Purges closed transactions from transactions map. Can only be called from
 684      * within synchronized method. Calling this method more than once within the
 685      * method can modify the resulting map that was obtained in previous calls.
 686      *
 687      * @return current view on transactions map.
 688      */
 689     public Map<String, Entry<ConfigTransactionControllerInternal, ConfigTransactionLookupRegistry>> getCurrentTransactions() {
 690         // first, remove closed transaction
 691         for (Iterator<Entry<String, Entry<ConfigTransactionControllerInternal, ConfigTransactionLookupRegistry>>> it = transactions
 692                 .entrySet().iterator(); it.hasNext(); ) {
 693             Entry<String, Entry<ConfigTransactionControllerInternal, ConfigTransactionLookupRegistry>> entry = it
 694                     .next();
 695             if (entry.getValue().getKey().isClosed()) {
 696                 it.remove();
 697             }
 698         }
 699         return Collections.unmodifiableMap(transactions);
 700     }
 701 }