DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (cdf352f02ac4)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_dom_idbdatabase_h__
#define mozilla_dom_idbdatabase_h__

#include "mozilla/Attributes.h"
#include "mozilla/dom/IDBTransactionBinding.h"
#include "mozilla/dom/StorageTypeBinding.h"
#include "mozilla/dom/indexedDB/PBackgroundIDBSharedTypes.h"
#include "mozilla/dom/quota/PersistenceType.h"
#include "mozilla/DOMEventTargetHelper.h"
#include "mozilla/UniquePtr.h"
#include "nsDataHashtable.h"
#include "nsHashKeys.h"
#include "nsString.h"
#include "nsTHashtable.h"

class nsIEventTarget;
class nsIGlobalObject;

namespace mozilla {

class ErrorResult;
class EventChainPostVisitor;

namespace dom {

class Blob;
class DOMStringList;
class IDBFactory;
class IDBMutableFile;
class IDBObjectStore;
struct IDBObjectStoreParameters;
class IDBOpenDBRequest;
class IDBRequest;
class IDBTransaction;
template <class>
class Optional;
class StringOrStringSequence;

namespace indexedDB {
class BackgroundDatabaseChild;
class PBackgroundIDBDatabaseFileChild;
}  // namespace indexedDB

class IDBDatabase final : public DOMEventTargetHelper {
  typedef mozilla::dom::indexedDB::DatabaseSpec DatabaseSpec;
  typedef mozilla::dom::StorageType StorageType;
  typedef mozilla::dom::quota::PersistenceType PersistenceType;

  class Observer;
  friend class Observer;

  friend class IDBObjectStore;
  friend class IDBIndex;

  // The factory must be kept alive when IndexedDB is used in multiple
  // processes. If it dies then the entire actor tree will be destroyed with it
  // and the world will explode.
  SafeRefPtr<IDBFactory> mFactory;

  UniquePtr<DatabaseSpec> mSpec;

  // Normally null except during a versionchange transaction.
  UniquePtr<DatabaseSpec> mPreviousSpec;

  indexedDB::BackgroundDatabaseChild* mBackgroundActor;

  nsTHashtable<nsPtrHashKey<IDBTransaction>> mTransactions;

  nsDataHashtable<nsISupportsHashKey,
                  indexedDB::PBackgroundIDBDatabaseFileChild*>
      mFileActors;

  RefPtr<Observer> mObserver;

  // Weak refs, IDBMutableFile strongly owns this IDBDatabase object.
  nsTArray<IDBMutableFile*> mLiveMutableFiles;

  const bool mFileHandleDisabled;
  bool mClosed;
  bool mInvalidated;
  bool mQuotaExceeded;
  bool mIncreasedActiveDatabaseCount;

 public:
  static MOZ_MUST_USE RefPtr<IDBDatabase> Create(
      IDBOpenDBRequest* aRequest, SafeRefPtr<IDBFactory> aFactory,
      indexedDB::BackgroundDatabaseChild* aActor,
      UniquePtr<DatabaseSpec> aSpec);

  void AssertIsOnOwningThread() const
#ifdef DEBUG
      ;
#else
  {
  }
#endif

  nsIEventTarget* EventTarget() const;

  const nsString& Name() const;

  void GetName(nsAString& aName) const {
    AssertIsOnOwningThread();

    aName = Name();
  }

  uint64_t Version() const;

  MOZ_MUST_USE RefPtr<Document> GetOwnerDocument() const;

  void Close() {
    AssertIsOnOwningThread();

    CloseInternal();
  }

  bool IsClosed() const {
    AssertIsOnOwningThread();

    return mClosed;
  }

  void Invalidate();

  // Whether or not the database has been invalidated. If it has then no further
  // transactions for this database will be allowed to run.
  bool IsInvalidated() const {
    AssertIsOnOwningThread();

    return mInvalidated;
  }

  void SetQuotaExceeded() { mQuotaExceeded = true; }

  void EnterSetVersionTransaction(uint64_t aNewVersion);

  void ExitSetVersionTransaction();

  // Called when a versionchange transaction is aborted to reset the
  // DatabaseInfo.
  void RevertToPreviousState();

  void RegisterTransaction(IDBTransaction* aTransaction);

  void UnregisterTransaction(IDBTransaction* aTransaction);

  void AbortTransactions(bool aShouldWarn);

  indexedDB::PBackgroundIDBDatabaseFileChild* GetOrCreateFileActorForBlob(
      Blob& aBlob);

  void NoteFinishedFileActor(
      indexedDB::PBackgroundIDBDatabaseFileChild* aFileActor);

  void NoteActiveTransaction();

  void NoteInactiveTransaction();

  // XXX This doesn't really belong here... It's only needed for IDBMutableFile
  //     serialization and should be removed or fixed someday.
  nsresult GetQuotaInfo(nsACString& aOrigin, PersistenceType* aPersistenceType);

  bool IsFileHandleDisabled() const { return mFileHandleDisabled; }

  void NoteLiveMutableFile(IDBMutableFile* aMutableFile);

  void NoteFinishedMutableFile(IDBMutableFile* aMutableFile);

  MOZ_MUST_USE RefPtr<DOMStringList> ObjectStoreNames() const;

  MOZ_MUST_USE RefPtr<IDBObjectStore> CreateObjectStore(
      const nsAString& aName,
      const IDBObjectStoreParameters& aOptionalParameters, ErrorResult& aRv);

  void DeleteObjectStore(const nsAString& name, ErrorResult& aRv);

  // This will be called from the DOM.
  MOZ_MUST_USE RefPtr<IDBTransaction> Transaction(
      JSContext* aCx, const StringOrStringSequence& aStoreNames,
      IDBTransactionMode aMode, ErrorResult& aRv);

  StorageType Storage() const;

  IMPL_EVENT_HANDLER(abort)
  IMPL_EVENT_HANDLER(close)
  IMPL_EVENT_HANDLER(error)
  IMPL_EVENT_HANDLER(versionchange)

  MOZ_MUST_USE RefPtr<IDBRequest> CreateMutableFile(
      JSContext* aCx, const nsAString& aName, const Optional<nsAString>& aType,
      ErrorResult& aRv);

  void ClearBackgroundActor() {
    AssertIsOnOwningThread();

    // Decrease the number of active databases if it was not done in
    // CloseInternal().
    MaybeDecreaseActiveDatabaseCount();

    mBackgroundActor = nullptr;
  }

  const DatabaseSpec* Spec() const { return mSpec.get(); }

  template <typename Pred>
  indexedDB::ObjectStoreSpec* LookupModifiableObjectStoreSpec(Pred&& aPred) {
    auto& objectStores = mSpec->objectStores();
    const auto foundIt =
        std::find_if(objectStores.begin(), objectStores.end(), aPred);
    return foundIt != objectStores.end() ? &*foundIt : nullptr;
  }

  NS_DECL_ISUPPORTS_INHERITED
  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(IDBDatabase, DOMEventTargetHelper)

  // DOMEventTargetHelper
  void DisconnectFromOwner() override;

  virtual void LastRelease() override;

  virtual nsresult PostHandleEvent(EventChainPostVisitor& aVisitor) override;

  // nsWrapperCache
  virtual JSObject* WrapObject(JSContext* aCx,
                               JS::Handle<JSObject*> aGivenProto) override;

 private:
  IDBDatabase(IDBOpenDBRequest* aRequest, SafeRefPtr<IDBFactory> aFactory,
              indexedDB::BackgroundDatabaseChild* aActor,
              UniquePtr<DatabaseSpec> aSpec);

  ~IDBDatabase();

  void CloseInternal();

  void InvalidateInternal();

  bool RunningVersionChangeTransaction() const {
    AssertIsOnOwningThread();

    return !!mPreviousSpec;
  }

  void RefreshSpec(bool aMayDelete);

  void ExpireFileActors(bool aExpireAll);

  void InvalidateMutableFiles();

  void NoteInactiveTransactionDelayed();

  void LogWarning(const char* aMessageName, const nsAString& aFilename,
                  uint32_t aLineNumber, uint32_t aColumnNumber);

  // Only accessed by IDBObjectStore.
  nsresult RenameObjectStore(int64_t aObjectStoreId, const nsAString& aName);

  // Only accessed by IDBIndex.
  nsresult RenameIndex(int64_t aObjectStoreId, int64_t aIndexId,
                       const nsAString& aName);

  void IncreaseActiveDatabaseCount();

  void MaybeDecreaseActiveDatabaseCount();
};

}  // namespace dom
}  // namespace mozilla

#endif  // mozilla_dom_idbdatabase_h__