The Tor Browser: storage/src/mozStorageAsyncStatement.h@97036ab72558

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-

     2  * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :

     3  * This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #ifndef mozilla_storage_mozStorageAsyncStatement_h_

     8 #define mozilla_storage_mozStorageAsyncStatement_h_

    10 #include "nsAutoPtr.h"

    11 #include "nsString.h"

    13 #include "nsTArray.h"

    15 #include "mozStorageBindingParamsArray.h"

    16 #include "mozStorageStatementData.h"

    17 #include "mozIStorageAsyncStatement.h"

    18 #include "StorageBaseStatementInternal.h"

    19 #include "mozilla/Attributes.h"

    21 class nsIXPConnectJSObjectHolder;

    22 struct sqlite3_stmt;

    24 namespace mozilla {

    25 namespace storage {

    27 class AsyncStatementJSHelper;

    28 class Connection;

    30 class AsyncStatement MOZ_FINAL : public mozIStorageAsyncStatement

    31                                , public StorageBaseStatementInternal

    32 {

    33 public:

    34   NS_DECL_THREADSAFE_ISUPPORTS

    35   NS_DECL_MOZISTORAGEASYNCSTATEMENT

    36   NS_DECL_MOZISTORAGEBASESTATEMENT

    37   NS_DECL_MOZISTORAGEBINDINGPARAMS

    38   NS_DECL_STORAGEBASESTATEMENTINTERNAL

    40   AsyncStatement();

    42   /**

    43    * Initializes the object on aDBConnection by preparing the SQL statement

    44    * given by aSQLStatement.

    45    *

    46    * @param aDBConnection

    47    *        The Connection object this statement is associated with.

    48    * @param aNativeConnection

    49    *        The native Sqlite connection this statement is associated with.

    50    * @param aSQLStatement

    51    *        The SQL statement to prepare that this object will represent.

    52    */

    53   nsresult initialize(Connection *aDBConnection,

    54                       sqlite3 *aNativeConnection,

    55                       const nsACString &aSQLStatement);

    57   /**

    58    * Obtains and transfers ownership of the array of parameters that are bound

    59    * to this statment.  This can be null.

    60    */

    61   inline already_AddRefed<BindingParamsArray> bindingParamsArray()

    62   {

    63     return mParamsArray.forget();

    64   }

    67 private:

    68   ~AsyncStatement();

    70   /**

    71    * Clean up the references JS helpers hold to us.  For cycle-avoidance reasons

    72    * they do not hold reference-counted references to us, so it is important

    73    * we do this.

    74    */

    75   void cleanupJSHelpers();

    77   /**

    78    * @return a pointer to the BindingParams object to use with our Bind*

    79    *         method.

    80    */

    81   mozIStorageBindingParams *getParams();

    83   /**

    84    * The SQL string as passed by the user.  We store it because we create the

    85    * async statement on-demand on the async thread.

    86    */

    87   nsCString mSQLString;

    89   /**

    90    * Holds the array of parameters to bind to this statement when we execute

    91    * it asynchronously.

    92    */

    93   nsRefPtr<BindingParamsArray> mParamsArray;

    95   /**

    96    * Caches the JS 'params' helper for this statement.

    97    */

    98   nsCOMPtr<nsIXPConnectJSObjectHolder> mStatementParamsHolder;

   100   /**

   101    * Have we been explicitly finalized by the user?

   102    */

   103   bool mFinalized;

   105   /**

   106    * Required for access to private mStatementParamsHolder field by

   107    * AsyncStatementJSHelper::getParams.

   108    */

   109   friend class AsyncStatementJSHelper;

   110 };

   112 } // storage

   113 } // mozilla

   115 #endif // mozilla_storage_mozStorageAsyncStatement_h_

The Tor Browser / file revision

storage/src/mozStorageAsyncStatement.h@97036ab72558

storage/src/mozStorageAsyncStatement.h