C++ Persist函数代码示例

nsresult
DOMStorageCache::RemoveItem(const DOMStorage* aStorage, const nsAString& aKey,
                            nsString& aOld)
{
  Telemetry::AutoTimer<Telemetry::LOCALDOMSTORAGE_REMOVEKEY_MS> autoTimer;

  if (Persist(aStorage)) {
    WaitForPreload(Telemetry::LOCALDOMSTORAGE_REMOVEKEY_BLOCKING_MS);
    if (NS_FAILED(mLoadResult)) {
      return mLoadResult;
    }
  }

  Data& data = DataSet(aStorage);
  if (!data.mKeys.Get(aKey, &aOld)) {
    SetDOMStringToNull(aOld);
    return NS_SUCCESS_DOM_NO_OPERATION;
  }

  // Recalculate the cached data size
  const int64_t delta = -(static_cast<int64_t>(aOld.Length()));
  unused << ProcessUsageDelta(aStorage, delta);
  data.mKeys.Remove(aKey);

  if (Persist(aStorage)) {
    return sDatabase->AsyncRemoveItem(this, aKey);
  }

  return NS_OK;
}

nsresult
DOMStorageCache::RemoveItem(const DOMStorage* aStorage, const nsAString& aKey,
                            nsString& aOld)
{
  if (Persist(aStorage)) {
    WaitForPreload(Telemetry::LOCALDOMSTORAGE_REMOVEKEY_BLOCKING_MS);
    if (NS_FAILED(mLoadResult)) {
      return mLoadResult;
    }
  }

  Data& data = DataSet(aStorage);
  if (!data.mKeys.Get(aKey, &aOld)) {
    SetDOMStringToNull(aOld);
    return NS_SUCCESS_DOM_NO_OPERATION;
  }

  // Recalculate the cached data size
  const int64_t delta = -(static_cast<int64_t>(aOld.Length()) +
                          static_cast<int64_t>(aKey.Length()));
  Unused << ProcessUsageDelta(aStorage, delta);
  data.mKeys.Remove(aKey);

  if (Persist(aStorage)) {
    if (!sDatabase) {
      NS_ERROR("Writing to localStorage after the database has been shut down"
               ", data lose!");
      return NS_ERROR_NOT_INITIALIZED;
    }

    return sDatabase->AsyncRemoveItem(this, aKey);
  }

  return NS_OK;
}

nsresult
LocalStorageCache::SetItem(const LocalStorage* aStorage, const nsAString& aKey,
                           const nsString& aValue, nsString& aOld,
                           const MutationSource aSource)
{
  // Size of the cache that will change after this action.
  int64_t delta = 0;

  if (Persist(aStorage)) {
    WaitForPreload(Telemetry::LOCALDOMSTORAGE_SETVALUE_BLOCKING_MS);
    if (NS_FAILED(mLoadResult)) {
      return mLoadResult;
    }
  }

  Data& data = DataSet(aStorage);
  if (!data.mKeys.Get(aKey, &aOld)) {
    SetDOMStringToNull(aOld);

    // We only consider key size if the key doesn't exist before.
    delta += static_cast<int64_t>(aKey.Length());
  }

  delta += static_cast<int64_t>(aValue.Length()) -
           static_cast<int64_t>(aOld.Length());

  if (!ProcessUsageDelta(aStorage, delta, aSource)) {
    return NS_ERROR_DOM_QUOTA_REACHED;
  }

  if (aValue == aOld && DOMStringIsNull(aValue) == DOMStringIsNull(aOld)) {
    return NS_SUCCESS_DOM_NO_OPERATION;
  }

  data.mKeys.Put(aKey, aValue);

  if (aSource == ContentMutation && Persist(aStorage)) {
    if (!sDatabase) {
      NS_ERROR("Writing to localStorage after the database has been shut down"
               ", data lose!");
      return NS_ERROR_NOT_INITIALIZED;
    }

    if (DOMStringIsNull(aOld)) {
      return sDatabase->AsyncAddItem(this, aKey, aValue);
    }

    return sDatabase->AsyncUpdateItem(this, aKey, aValue);
  }

  return NS_OK;
}

/** (Re)initialize for on-demand loading
 *
 *  Calling Rollback will cancel all uncommitted changes.
 */
bool c4_Storage::Rollback(bool full_) {
  c4_Persist *pers = Persist();
  bool f = Strategy().IsValid() && pers->Rollback(full_);
  // adjust our copy when the root view has been replaced
  *(c4_View*)this = &pers->Root();
  return f;
}

/**
 * Save size (& optionally position) in registry
 */
void
CMoveConstraint::LoadPosition(LPCTSTR szValueName, bool position)
{
	m_sRegistryValueName = szValueName;
	m_bPersistent=true;
	Persist(false, position);
}

c4_Storage::c4_Storage(const char *fname_, int mode_) {
  c4_FileStrategy *strat = d4_new c4_FileStrategy;
  strat->DataOpen(fname_, mode_);

  Initialize(*strat, true, mode_);
  if (strat->IsValid())
    Persist()->LoadAll();
}

void SimpleCheckpoint::DoCheckpoint() {
  // TODO split checkpoint file into multiple files in the future
  // Create a new file for checkpoint
  CreateFile();

  auto &log_manager = LogManager::GetInstance();
  if (logger_ == nullptr) {
    logger_.reset(BackendLogger::GetBackendLogger(LOGGING_TYPE_NVM_WAL));
  }

  start_commit_id_ = log_manager.GetGlobalMaxFlushedCommitId();
  if (start_commit_id_ == INVALID_CID) {
    auto &txn_manager = concurrency::TransactionManagerFactory::GetInstance();
    start_commit_id_ = txn_manager.GetMaxCommittedCid();
  }

  LOG_TRACE("DoCheckpoint cid = %lu", start_commit_id_);

  // Add txn begin record
  std::shared_ptr<LogRecord> begin_record(new TransactionRecord(
      LOGRECORD_TYPE_TRANSACTION_BEGIN, start_commit_id_));
  CopySerializeOutput begin_output_buffer;
  begin_record->Serialize(begin_output_buffer);
  records_.push_back(begin_record);

  auto &catalog_manager = catalog::Manager::GetInstance();
  auto database_count = catalog_manager.GetDatabaseCount();

  // loop all databases
  for (oid_t database_idx = 0; database_idx < database_count; database_idx++) {
    auto database = catalog_manager.GetDatabase(database_idx);
    auto table_count = database->GetTableCount();
    auto database_oid = database->GetOid();

    // loop all tables
    for (oid_t table_idx = 0; table_idx < table_count; table_idx++) {
      // Get the target table
      storage::DataTable *target_table = database->GetTable(table_idx);
      PL_ASSERT(target_table);
      LOG_TRACE("SeqScan: database idx %u table idx %u: %s", database_idx,
               table_idx, target_table->GetName().c_str());
      Scan(target_table, database_oid);
    }
  }

  // Add txn commit record
  std::shared_ptr<LogRecord> commit_record(new TransactionRecord(
      LOGRECORD_TYPE_TRANSACTION_COMMIT, start_commit_id_));
  CopySerializeOutput commit_output_buffer;
  commit_record->Serialize(commit_output_buffer);
  records_.push_back(commit_record);

  // TODO Add delimiter record for checkpoint recovery as well
  Persist();

  Cleanup();
  most_recent_checkpoint_cid = start_commit_id_;
}

nsresult
DOMStorageCache::SetItem(const DOMStorage* aStorage, const nsAString& aKey,
                         const nsString& aValue, nsString& aOld)
{
  if (Persist(aStorage)) {
    WaitForPreload(Telemetry::LOCALDOMSTORAGE_SETVALUE_BLOCKING_MS);
    if (NS_FAILED(mLoadResult)) {
      return mLoadResult;
    }
  }

  Data& data = DataSet(aStorage);
  if (!data.mKeys.Get(aKey, &aOld)) {
    SetDOMStringToNull(aOld);
  }

  // Check the quota first
  const int64_t delta = static_cast<int64_t>(aValue.Length()) -
                        static_cast<int64_t>(aOld.Length());
  if (!ProcessUsageDelta(aStorage, delta)) {
    return NS_ERROR_DOM_QUOTA_REACHED;
  }

  if (aValue == aOld && DOMStringIsNull(aValue) == DOMStringIsNull(aOld)) {
    return NS_SUCCESS_DOM_NO_OPERATION;
  }

  data.mKeys.Put(aKey, aValue);

  if (Persist(aStorage)) {
    if (!sDatabase) {
      NS_ERROR("Writing to localStorage after the database has been shut down"
               ", data lose!");
      return NS_ERROR_NOT_INITIALIZED;
    }

    if (DOMStringIsNull(aOld)) {
      return sDatabase->AsyncAddItem(this, aKey, aValue);
    }

    return sDatabase->AsyncUpdateItem(this, aKey, aValue);
  }

  return NS_OK;
}

bool CFavouritesService::Save(const CFileItemList& items)
{
  {
    CSingleLock lock(m_criticalSection);
    m_favourites.Clear();
    m_favourites.Copy(items);
    Persist();
  }
  OnUpdated();
  return true;
}

bool CPVREpg::Update(const CEpg &epg, bool bUpdateDb /* = false */)
{
  bool bReturn = CEpg::Update(epg, false); // don't update the db yet

  m_Channel     = epg.m_Channel;
  m_bHasChannel = true;

  if (bUpdateDb)
    bReturn = Persist(false);

  return bReturn;
}

HRESULT CACTController::PersistBank(IStream* pStm, bool bSave, int iBank)
{
	// Rotaries binding
	if (FAILED(Persist(pStm, bSave, &m_dwKnobsBinding[iBank], sizeof(m_dwKnobsBinding[iBank]))))
		return E_FAIL;

	// Exclude rotaries from ACT
	if (FAILED(Persist(pStm, bSave, &m_bExcludeRotariesACT[iBank], sizeof(m_bExcludeRotariesACT[iBank]))))
		return E_FAIL;

	// Sliders binding
	if (FAILED(Persist(pStm, bSave, &m_dwSlidersBinding[iBank], sizeof(m_dwSlidersBinding[iBank]))))
		return E_FAIL;

	// Exclude sliders from ACT
	if (FAILED(Persist(pStm, bSave, &m_bExcludeSlidersACT[iBank], sizeof(m_bExcludeSlidersACT[iBank]))))
		return E_FAIL;

	// Buttons
	for (int n = 0; n < NUM_VIRTUAL_BUTTONS; n++)
	{
		if (FAILED(Persist(pStm, bSave, &m_dwButtonAction[iBank][n], sizeof(m_dwButtonAction[iBank][n]))))
			return E_FAIL;

		if (FAILED(Persist(pStm, bSave, &m_bButtonExcludeACT[iBank][n], sizeof(m_bButtonExcludeACT[iBank][n]))))
			return E_FAIL;
	}

	return S_OK;
}

void
DOMStorageCache::GetKeys(const DOMStorage* aStorage, nsTArray<nsString>& aKeys)
{
  if (Persist(aStorage)) {
    WaitForPreload(Telemetry::LOCALDOMSTORAGE_GETALLKEYS_BLOCKING_MS);
  }

  if (NS_FAILED(mLoadResult)) {
    return;
  }

  DataSet(aStorage).mKeys.EnumerateRead(KeysArrayBuilder, &aKeys);
}

/// Define the complete view structure of the storage
void c4_Storage::SetStructure(const char *description_) {
  d4_assert(description_ != 0);

  if (description_ != Description()) {
    c4_String s = "[" + c4_String(description_) + "]";
    description_ = s;

    c4_Field *field = d4_new c4_Field(description_);
    d4_assert(! *description_);

    d4_assert(field != 0);
    Persist()->Root().Restructure(*field, false);
  }
}

HRESULT CACTController::Persist(IStream* pStm, bool bSave, CString *pStr)
{
	int iLen;

	if (bSave)
	{
		iLen = pStr->GetLength();
		if (FAILED(Persist(pStm, bSave, &iLen, sizeof(iLen))))
			return E_FAIL;
		if (FAILED(Persist(pStm, bSave, (void *)(LPCTSTR)(*pStr), iLen)))
			return E_FAIL;
	}
	else
	{
		if (FAILED(Persist(pStm, bSave, &iLen, sizeof(iLen))))
			return E_FAIL;
		HRESULT hr = Persist(pStm, bSave, pStr->GetBuffer(iLen), iLen);
		pStr->ReleaseBuffer(iLen);
		if (FAILED(hr))
			return E_FAIL;
	}

	return S_OK;
}

Service& Service::operator=(const Service& s)
{
  *reinterpret_cast<Persist *>(this) = Persist(s);
  service_label = s.service_label;
  service_descriptor = s.service_descriptor;
  service_identifier = s.service_identifier;
  country = s.country;
  language = s.language;
  language_long = s.language_long;
  audio_ref = s.audio_ref;
  data_ref = s.data_ref;
  afs_ref = s.afs_ref;
  conditional_access = s.conditional_access;
  ca_system_identifier = s.ca_system_identifier;
  ca_data = s.ca_data;
  announcement = s.announcement;
  return *this;
}