/** {@inheritDoc} */
  @Override()
  public void finalizeBackend() {
    // Deregister as a change listener.
    cfg.removeLocalDBChangeListener(this);

    // Deregister our base DNs.
    for (DN dn : rootContainer.getBaseDNs()) {
      try {
        DirectoryServer.deregisterBaseDN(dn);
      } catch (Exception e) {
        if (debugEnabled()) {
          TRACER.debugCaught(DebugLogLevel.ERROR, e);
        }
      }
    }

    DirectoryServer.deregisterMonitorProvider(rootContainerMonitor);
    DirectoryServer.deregisterMonitorProvider(diskMonitor);

    // We presume the server will prevent more operations coming into this
    // backend, but there may be existing operations already in the
    // backend. We need to wait for them to finish.
    waitUntilQuiescent();

    // Close the database.
    try {
      rootContainer.close();
      rootContainer = null;
    } catch (DatabaseException e) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, e);
      }
      Message message = ERR_JEB_DATABASE_EXCEPTION.get(e.getMessage());
      logError(message);
    }

    // Checksum this db environment and register its offline state id/checksum.
    DirectoryServer.registerOfflineBackendStateID(this.getBackendID(), checksumDbEnv());

    // Deregister the alert generator.
    DirectoryServer.deregisterAlertGenerator(this);

    // Make sure the thread counts are zero for next initialization.
    threadTotalCount.set(0);
    threadWriteCount.set(0);

    // Log an informational message.
    Message message = NOTE_BACKEND_OFFLINE.get(cfg.getBackendId());
    logError(message);
  }
 private RootContainer initializeRootContainer(EnvironmentConfig envConfig)
     throws ConfigException, InitializationException {
   // Open the database environment
   try {
     RootContainer rc = new RootContainer(this, cfg);
     rc.open(envConfig);
     return rc;
   } catch (DatabaseException e) {
     if (debugEnabled()) {
       TRACER.debugCaught(DebugLogLevel.ERROR, e);
     }
     Message message = ERR_JEB_OPEN_ENV_FAIL.get(e.getMessage());
     throw new InitializationException(message, e);
   }
 }
  /** {@inheritDoc} */
  @Override()
  public void search(SearchOperation searchOperation)
      throws DirectoryException, CanceledOperationException {
    readerBegin();

    EntryContainer ec;
    if (rootContainer != null) {
      ec = rootContainer.getEntryContainer(searchOperation.getBaseDN());
    } else {
      Message message = ERR_ROOT_CONTAINER_NOT_INITIALIZED.get(getBackendID());
      throw new DirectoryException(DirectoryServer.getServerErrorResultCode(), message);
    }
    ec.sharedLock.lock();

    try {
      ec.search(searchOperation);
    } catch (DatabaseException e) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, e);
      }
      throw createDirectoryException(e);
    } finally {
      ec.sharedLock.unlock();
      readerEnd();
    }
  }
  /** {@inheritDoc} */
  @Override()
  public void replaceEntry(Entry oldEntry, Entry newEntry, ModifyOperation modifyOperation)
      throws DirectoryException, CanceledOperationException {
    checkDiskSpace(modifyOperation);
    writerBegin();

    DN entryDN = newEntry.getDN();
    EntryContainer ec;
    if (rootContainer != null) {
      ec = rootContainer.getEntryContainer(entryDN);
    } else {
      Message message = ERR_ROOT_CONTAINER_NOT_INITIALIZED.get(getBackendID());
      throw new DirectoryException(DirectoryServer.getServerErrorResultCode(), message);
    }

    ec.sharedLock.lock();

    try {
      ec.replaceEntry(oldEntry, newEntry, modifyOperation);
    } catch (DatabaseException e) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, e);
      }
      throw createDirectoryException(e);
    } finally {
      ec.sharedLock.unlock();
      writerEnd();
    }
  }
  /** {@inheritDoc} */
  @Override()
  public Entry getEntry(DN entryDN) throws DirectoryException {
    readerBegin();

    EntryContainer ec;
    if (rootContainer != null) {
      ec = rootContainer.getEntryContainer(entryDN);
    } else {
      Message message = ERR_ROOT_CONTAINER_NOT_INITIALIZED.get(getBackendID());
      throw new DirectoryException(DirectoryServer.getServerErrorResultCode(), message);
    }

    ec.sharedLock.lock();
    Entry entry;
    try {
      entry = ec.getEntry(entryDN);
    } catch (DatabaseException e) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, e);
      }
      throw createDirectoryException(e);
    } finally {
      ec.sharedLock.unlock();
      readerEnd();
    }

    return entry;
  }
  /** {@inheritDoc} */
  @Override()
  public long numSubordinates(DN entryDN, boolean subtree) throws DirectoryException {
    EntryContainer ec;
    if (rootContainer != null) {
      ec = rootContainer.getEntryContainer(entryDN);
    } else {
      Message message = ERR_ROOT_CONTAINER_NOT_INITIALIZED.get(getBackendID());
      throw new DirectoryException(DirectoryServer.getServerErrorResultCode(), message);
    }

    if (ec == null) {
      return -1;
    }

    readerBegin();
    ec.sharedLock.lock();
    try {
      long count = ec.getNumSubordinates(entryDN, subtree);
      if (count == Long.MAX_VALUE) {
        // The index entry limit has exceeded and there is no count maintained.
        return -1;
      }
      return count;
    } catch (DatabaseException e) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, e);
      }
      throw createDirectoryException(e);
    } finally {
      ec.sharedLock.unlock();
      readerEnd();
    }
  }
  /** {@inheritDoc} */
  @Override()
  public long getEntryCount() {
    if (rootContainer != null) {
      try {
        return rootContainer.getEntryCount();
      } catch (Exception e) {
        if (debugEnabled()) {
          TRACER.debugCaught(DebugLogLevel.ERROR, e);
        }
      }
    }

    return -1;
  }
  /**
   * Verify the integrity of the backend instance.
   *
   * @param verifyConfig The verify configuration.
   * @param statEntry Optional entry to save stats into.
   * @return The error count.
   * @throws ConfigException If an unrecoverable problem arises during initialization.
   * @throws InitializationException If a problem occurs during initialization that is not related
   *     to the server configuration.
   * @throws DirectoryException If a Directory Server error occurs.
   */
  public long verifyBackend(VerifyConfig verifyConfig, Entry statEntry)
      throws InitializationException, ConfigException, DirectoryException {
    // If the backend already has the root container open, we must use the same
    // underlying root container
    boolean openRootContainer = rootContainer == null;
    long errorCount = 0;

    try {
      if (openRootContainer) {
        EnvironmentConfig envConfig = ConfigurableEnvironment.parseConfigEntry(cfg);

        envConfig.setReadOnly(true);
        envConfig.setAllowCreate(false);
        envConfig.setTransactional(false);
        envConfig.setConfigParam("je.env.isLocking", "true");
        envConfig.setConfigParam("je.env.runCheckpointer", "true");

        rootContainer = initializeRootContainer(envConfig);
      }

      VerifyJob verifyJob = new VerifyJob(verifyConfig);
      errorCount = verifyJob.verifyBackend(rootContainer, statEntry);
    } catch (DatabaseException e) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, e);
      }
      throw createDirectoryException(e);
    } catch (JebException e) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, e);
      }
      throw new DirectoryException(
          DirectoryServer.getServerErrorResultCode(), e.getMessageObject());
    } finally {
      // If a root container was opened in this method as read only, close it
      // to leave the backend in the same state.
      if (openRootContainer && rootContainer != null) {
        try {
          rootContainer.close();
          rootContainer = null;
        } catch (DatabaseException e) {
          if (debugEnabled()) {
            TRACER.debugCaught(DebugLogLevel.ERROR, e);
          }
        }
      }
    }
    return errorCount;
  }
  /** {@inheritDoc} */
  @Override()
  public void renameEntry(DN currentDN, Entry entry, ModifyDNOperation modifyDNOperation)
      throws DirectoryException, CanceledOperationException {
    checkDiskSpace(modifyDNOperation);
    writerBegin();

    EntryContainer currentContainer;
    if (rootContainer != null) {
      currentContainer = rootContainer.getEntryContainer(currentDN);
    } else {
      Message message = ERR_ROOT_CONTAINER_NOT_INITIALIZED.get(getBackendID());
      throw new DirectoryException(DirectoryServer.getServerErrorResultCode(), message);
    }

    EntryContainer container = rootContainer.getEntryContainer(entry.getDN());

    if (currentContainer != container) {
      // FIXME: No reason why we cannot implement a move between containers
      // since the containers share the same database environment.
      Message msg = WARN_JEB_FUNCTION_NOT_SUPPORTED.get();
      throw new DirectoryException(ResultCode.UNWILLING_TO_PERFORM, msg);
    }

    currentContainer.sharedLock.lock();
    try {
      currentContainer.renameEntry(currentDN, entry, modifyDNOperation);
    } catch (DatabaseException e) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, e);
      }
      throw createDirectoryException(e);
    } finally {
      currentContainer.sharedLock.unlock();
      writerEnd();
    }
  }
  /**
   * Creates a customized DirectoryException from the DatabaseException thrown by JE backend.
   *
   * @param e The DatabaseException to be converted.
   * @return DirectoryException created from exception.
   */
  DirectoryException createDirectoryException(DatabaseException e) {
    ResultCode resultCode = DirectoryServer.getServerErrorResultCode();
    Message message;
    if ((e instanceof EnvironmentFailureException) && !rootContainer.isValid()) {
      message = NOTE_BACKEND_ENVIRONMENT_UNUSABLE.get(getBackendID());
      logError(message);
      DirectoryServer.sendAlertNotification(
          DirectoryServer.getInstance(), ALERT_TYPE_BACKEND_ENVIRONMENT_UNUSABLE, message);
    }

    String jeMessage = e.getMessage();
    if (jeMessage == null) {
      jeMessage = stackTraceToSingleLineString(e);
    }
    message = ERR_JEB_DATABASE_EXCEPTION.get(jeMessage);
    return new DirectoryException(resultCode, message, e);
  }
  /** {@inheritDoc} */
  @Override()
  public boolean isIndexed(AttributeType attributeType, IndexType indexType) {
    try {
      EntryContainer ec = rootContainer.getEntryContainer(baseDNs[0]);
      AttributeIndex ai = ec.getAttributeIndex(attributeType);
      if (ai == null) {
        return false;
      }

      Set<LocalDBIndexCfgDefn.IndexType> indexTypes = ai.getConfiguration().getIndexType();
      switch (indexType) {
        case PRESENCE:
          return indexTypes.contains(LocalDBIndexCfgDefn.IndexType.PRESENCE);

        case EQUALITY:
          return indexTypes.contains(LocalDBIndexCfgDefn.IndexType.EQUALITY);

        case SUBSTRING:
        case SUBINITIAL:
        case SUBANY:
        case SUBFINAL:
          return indexTypes.contains(LocalDBIndexCfgDefn.IndexType.SUBSTRING);

        case GREATER_OR_EQUAL:
        case LESS_OR_EQUAL:
          return indexTypes.contains(LocalDBIndexCfgDefn.IndexType.ORDERING);

        case APPROXIMATE:
          return indexTypes.contains(LocalDBIndexCfgDefn.IndexType.APPROXIMATE);

        default:
          return false;
      }
    } catch (Exception e) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, e);
      }

      return false;
    }
  }
  /**
   * Rebuild index(es) in the backend instance. Note that the server will not explicitly initialize
   * this backend before calling this method.
   *
   * @param rebuildConfig The rebuild configuration.
   * @throws ConfigException If an unrecoverable problem arises during initialization.
   * @throws InitializationException If a problem occurs during initialization that is not related
   *     to the server configuration.
   * @throws DirectoryException If a Directory Server error occurs.
   */
  public void rebuildBackend(RebuildConfig rebuildConfig)
      throws InitializationException, ConfigException, DirectoryException {
    // If the backend already has the root container open, we must use the same
    // underlying root container
    boolean openRootContainer = rootContainer == null;

    /*
     * If the rootContainer is open, the backend is initialized by something
     * else. We can't do any rebuild of system indexes while others are using
     * this backend.
     */
    if (!openRootContainer && rebuildConfig.includesSystemIndex()) {
      Message message = ERR_JEB_REBUILD_BACKEND_ONLINE.get();
      throw new DirectoryException(DirectoryServer.getServerErrorResultCode(), message);
    }

    try {
      EnvironmentConfig envConfig;
      if (openRootContainer) {
        envConfig = new EnvironmentConfig();
        envConfig.setAllowCreate(true);
        envConfig.setTransactional(false);
        envConfig.setDurability(Durability.COMMIT_NO_SYNC);
        envConfig.setLockTimeout(0, TimeUnit.SECONDS);
        envConfig.setTxnTimeout(0, TimeUnit.SECONDS);
        envConfig.setConfigParam(
            EnvironmentConfig.CLEANER_MIN_FILE_UTILIZATION,
            String.valueOf(cfg.getDBCleanerMinUtilization()));
        envConfig.setConfigParam(
            EnvironmentConfig.LOG_FILE_MAX, String.valueOf(cfg.getDBLogFileMax()));

        Importer importer = new Importer(rebuildConfig, cfg, envConfig);
        rootContainer = initializeRootContainer(envConfig);
        importer.rebuildIndexes(rootContainer);
      } else {
        envConfig = ConfigurableEnvironment.parseConfigEntry(cfg);

        Importer importer = new Importer(rebuildConfig, cfg, envConfig);
        importer.rebuildIndexes(rootContainer);
      }
    } catch (ExecutionException execEx) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, execEx);
      }
      Message message = ERR_EXECUTION_ERROR.get(execEx.getMessage());
      throw new DirectoryException(DirectoryServer.getServerErrorResultCode(), message);
    } catch (InterruptedException intEx) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, intEx);
      }
      Message message = ERR_INTERRUPTED_ERROR.get(intEx.getMessage());
      throw new DirectoryException(DirectoryServer.getServerErrorResultCode(), message);
    } catch (ConfigException ce) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, ce);
      }
      throw new DirectoryException(
          DirectoryServer.getServerErrorResultCode(), ce.getMessageObject());
    } catch (JebException e) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, e);
      }
      throw new DirectoryException(
          DirectoryServer.getServerErrorResultCode(), e.getMessageObject());
    } catch (InitializationException e) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, e);
      }
      throw new InitializationException(e.getMessageObject());
    } finally {
      // If a root container was opened in this method as read only, close it
      // to leave the backend in the same state.
      if (openRootContainer && rootContainer != null) {
        try {
          rootContainer.close();
          rootContainer = null;
        } catch (DatabaseException e) {
          if (debugEnabled()) {
            TRACER.debugCaught(DebugLogLevel.ERROR, e);
          }
        }
      }
    }
  }
  /** {@inheritDoc} */
  @Override()
  public LDIFImportResult importLDIF(LDIFImportConfig importConfig) throws DirectoryException {
    RuntimeInformation.logInfo();

    // If the backend already has the root container open, we must use the same
    // underlying root container
    boolean openRootContainer = rootContainer == null;

    // If the rootContainer is open, the backend is initialized by something
    // else.
    // We can't do import while the backend is online.
    if (!openRootContainer) {
      Message message = ERR_JEB_IMPORT_BACKEND_ONLINE.get();
      throw new DirectoryException(DirectoryServer.getServerErrorResultCode(), message);
    }

    try {
      EnvironmentConfig envConfig = new EnvironmentConfig();

      envConfig.setAllowCreate(true);
      envConfig.setTransactional(false);
      envConfig.setDurability(Durability.COMMIT_NO_SYNC);
      envConfig.setLockTimeout(0, TimeUnit.SECONDS);
      envConfig.setTxnTimeout(0, TimeUnit.SECONDS);
      envConfig.setConfigParam(
          EnvironmentConfig.CLEANER_MIN_FILE_UTILIZATION,
          String.valueOf(cfg.getDBCleanerMinUtilization()));
      envConfig.setConfigParam(
          EnvironmentConfig.LOG_FILE_MAX, String.valueOf(cfg.getDBLogFileMax()));

      if (!importConfig.appendToExistingData()) {
        if (importConfig.clearBackend() || cfg.getBaseDN().size() <= 1) {
          // We have the writer lock on the environment, now delete the
          // environment and re-open it. Only do this when we are
          // importing to all the base DNs in the backend or if the backend only
          // have one base DN.
          File parentDirectory = getFileForPath(cfg.getDBDirectory());
          File backendDirectory = new File(parentDirectory, cfg.getBackendId());
          // If the backend does not exist the import will create it.
          if (backendDirectory.exists()) {
            EnvManager.removeFiles(backendDirectory.getPath());
          }
        }
      }

      Importer importer = new Importer(importConfig, cfg, envConfig);
      rootContainer = initializeRootContainer(envConfig);
      return importer.processImport(rootContainer);
    } catch (ExecutionException execEx) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, execEx);
      }
      if (execEx.getCause() instanceof DirectoryException) {
        throw ((DirectoryException) execEx.getCause());
      } else {
        Message message = ERR_EXECUTION_ERROR.get(execEx.getMessage());
        throw new DirectoryException(DirectoryServer.getServerErrorResultCode(), message);
      }
    } catch (InterruptedException intEx) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, intEx);
      }
      Message message = ERR_INTERRUPTED_ERROR.get(intEx.getMessage());
      throw new DirectoryException(DirectoryServer.getServerErrorResultCode(), message);
    } catch (JebException je) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, je);
      }
      throw new DirectoryException(
          DirectoryServer.getServerErrorResultCode(), je.getMessageObject());
    } catch (InitializationException ie) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, ie);
      }
      throw new DirectoryException(
          DirectoryServer.getServerErrorResultCode(), ie.getMessageObject());
    } catch (ConfigException ce) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, ce);
      }
      throw new DirectoryException(
          DirectoryServer.getServerErrorResultCode(), ce.getMessageObject());
    } finally {
      // leave the backend in the same state.
      try {
        if (rootContainer != null) {
          long startTime = System.currentTimeMillis();
          rootContainer.close();
          long finishTime = System.currentTimeMillis();
          long closeTime = (finishTime - startTime) / 1000;
          Message msg = NOTE_JEB_IMPORT_LDIF_ROOTCONTAINER_CLOSE.get(closeTime);
          logError(msg);
          rootContainer = null;
        }

        // Sync the environment to disk.
        if (debugEnabled()) {
          Message message = NOTE_JEB_IMPORT_CLOSING_DATABASE.get();
          TRACER.debugInfo(message.toString());
        }
      } catch (DatabaseException de) {
        if (debugEnabled()) {
          TRACER.debugCaught(DebugLogLevel.ERROR, de);
        }
      }
    }
  }
  /** {@inheritDoc} */
  @Override()
  public void exportLDIF(LDIFExportConfig exportConfig) throws DirectoryException {
    // If the backend already has the root container open, we must use the same
    // underlying root container
    boolean openRootContainer = rootContainer == null;

    try {
      if (openRootContainer) {
        EnvironmentConfig envConfig = ConfigurableEnvironment.parseConfigEntry(cfg);

        envConfig.setReadOnly(true);
        envConfig.setAllowCreate(false);
        envConfig.setTransactional(false);
        envConfig.setConfigParam("je.env.isLocking", "true");
        envConfig.setConfigParam("je.env.runCheckpointer", "true");

        rootContainer = initializeRootContainer(envConfig);
      }

      ExportJob exportJob = new ExportJob(exportConfig);
      exportJob.exportLDIF(rootContainer);
    } catch (IOException ioe) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, ioe);
      }
      Message message = ERR_JEB_EXPORT_IO_ERROR.get(ioe.getMessage());
      throw new DirectoryException(DirectoryServer.getServerErrorResultCode(), message);
    } catch (JebException je) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, je);
      }
      throw new DirectoryException(
          DirectoryServer.getServerErrorResultCode(), je.getMessageObject());
    } catch (DatabaseException de) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, de);
      }
      throw createDirectoryException(de);
    } catch (LDIFException e) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, e);
      }
      throw new DirectoryException(
          DirectoryServer.getServerErrorResultCode(), e.getMessageObject());
    } catch (InitializationException ie) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, ie);
      }
      throw new DirectoryException(
          DirectoryServer.getServerErrorResultCode(), ie.getMessageObject());
    } catch (ConfigException ce) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, ce);
      }
      throw new DirectoryException(
          DirectoryServer.getServerErrorResultCode(), ce.getMessageObject());
    } finally {
      // If a root container was opened in this method as read only, close it
      // to leave the backend in the same state.
      if (openRootContainer && rootContainer != null) {
        try {
          rootContainer.close();
          rootContainer = null;
        } catch (DatabaseException e) {
          if (debugEnabled()) {
            TRACER.debugCaught(DebugLogLevel.ERROR, e);
          }
        }
      }
    }
  }
  /** {@inheritDoc} */
  @Override()
  public void initializeBackend() throws ConfigException, InitializationException {
    // Checksum this db environment and register its offline state id/checksum.
    DirectoryServer.registerOfflineBackendStateID(this.getBackendID(), checksumDbEnv());

    if (rootContainer == null) {
      EnvironmentConfig envConfig = ConfigurableEnvironment.parseConfigEntry(cfg);
      rootContainer = initializeRootContainer(envConfig);
    }

    // Preload the database cache.
    rootContainer.preload(cfg.getPreloadTimeLimit());

    try {
      // Log an informational message about the number of entries.
      Message message =
          NOTE_JEB_BACKEND_STARTED.get(cfg.getBackendId(), rootContainer.getEntryCount());
      logError(message);
    } catch (DatabaseException databaseException) {
      if (debugEnabled()) {
        TRACER.debugCaught(DebugLogLevel.ERROR, databaseException);
      }
      Message message = WARN_JEB_GET_ENTRY_COUNT_FAILED.get(databaseException.getMessage());
      throw new InitializationException(message, databaseException);
    }

    for (DN dn : cfg.getBaseDN()) {
      try {
        DirectoryServer.registerBaseDN(dn, this, false);
      } catch (Exception e) {
        if (debugEnabled()) {
          TRACER.debugCaught(DebugLogLevel.ERROR, e);
        }

        Message message =
            ERR_BACKEND_CANNOT_REGISTER_BASEDN.get(String.valueOf(dn), String.valueOf(e));
        throw new InitializationException(message, e);
      }
    }

    // Register a monitor provider for the environment.
    rootContainerMonitor = rootContainer.getMonitorProvider();
    DirectoryServer.registerMonitorProvider(rootContainerMonitor);

    // Register as disk space monitor handler
    File parentDirectory = getFileForPath(cfg.getDBDirectory());
    File backendDirectory = new File(parentDirectory, cfg.getBackendId());
    diskMonitor =
        new DiskSpaceMonitor(
            getBackendID() + " backend",
            backendDirectory,
            cfg.getDiskLowThreshold(),
            cfg.getDiskFullThreshold(),
            5,
            TimeUnit.SECONDS,
            this);
    diskMonitor.initializeMonitorProvider(null);
    DirectoryServer.registerMonitorProvider(diskMonitor);

    // Register as an AlertGenerator.
    DirectoryServer.registerAlertGenerator(this);
    // Register this backend as a change listener.
    cfg.addLocalDBChangeListener(this);
  }
  /** {@inheritDoc} */
  public ConfigChangeResult applyConfigurationChange(LocalDBBackendCfg newCfg) {
    ConfigChangeResult ccr;
    ResultCode resultCode = ResultCode.SUCCESS;
    ArrayList<Message> messages = new ArrayList<Message>();

    try {
      if (rootContainer != null) {
        DN[] newBaseDNs = new DN[newCfg.getBaseDN().size()];
        newBaseDNs = newCfg.getBaseDN().toArray(newBaseDNs);

        // Check for changes to the base DNs.
        for (DN baseDN : cfg.getBaseDN()) {
          boolean found = false;
          for (DN dn : newBaseDNs) {
            if (dn.equals(baseDN)) {
              found = true;
            }
          }
          if (!found) {
            // The base DN was deleted.
            DirectoryServer.deregisterBaseDN(baseDN);
            EntryContainer ec = rootContainer.unregisterEntryContainer(baseDN);
            ec.close();
            ec.delete();
          }
        }

        for (DN baseDN : newBaseDNs) {
          if (!rootContainer.getBaseDNs().contains(baseDN)) {
            try {
              // The base DN was added.
              EntryContainer ec = rootContainer.openEntryContainer(baseDN, null);
              rootContainer.registerEntryContainer(baseDN, ec);
              DirectoryServer.registerBaseDN(baseDN, this, false);
            } catch (Exception e) {
              if (debugEnabled()) {
                TRACER.debugCaught(DebugLogLevel.ERROR, e);
              }

              resultCode = DirectoryServer.getServerErrorResultCode();

              messages.add(
                  ERR_BACKEND_CANNOT_REGISTER_BASEDN.get(
                      String.valueOf(baseDN), String.valueOf(e)));
              ccr = new ConfigChangeResult(resultCode, false, messages);
              return ccr;
            }
          }
        }

        baseDNs = newBaseDNs;
      }

      if (cfg.getDiskFullThreshold() != newCfg.getDiskFullThreshold()
          || cfg.getDiskLowThreshold() != newCfg.getDiskLowThreshold()) {
        diskMonitor.setFullThreshold(newCfg.getDiskFullThreshold());
        diskMonitor.setLowThreshold(newCfg.getDiskLowThreshold());
      }

      // Put the new configuration in place.
      this.cfg = newCfg;
    } catch (Exception e) {
      messages.add(Message.raw(stackTraceToSingleLineString(e)));
      ccr = new ConfigChangeResult(DirectoryServer.getServerErrorResultCode(), false, messages);
      return ccr;
    }

    ccr = new ConfigChangeResult(resultCode, false, messages);
    return ccr;
  }