855 void CObservable::CancelTransaction(CRepositoryTransactor& aTransactor,TUid aRepositoryUid)

   856     {

   857     if (aTransactor.IsInTransaction())

   858         {

   859         ReleaseTransactionLock(aTransactor,aRepositoryUid);

   860         CObservable::TSharedRepositoryInfo* shrepinfo =SharedRepositoryInfo(aRepositoryUid);

   861         ASSERT(shrepinfo);

   862         shrepinfo->iTransactors.Remove(aTransactor);

   863         //Remove the link to the next transaction

   864         aTransactor.iLink.iNext = NULL;

   865         aTransactor.Deque();

   866         }

   867     }

   868 

   869 /** Private helper method which releases any read/write locks held in the shared repository

   870 by this transactor. Caller must set transactor's state or remove from queue as appropriate.

   871 @param aTransactor transactor whose read/write locks are to be released.

   872 @post Any read/write locks held by transactor are released.

   873 */

   874 void CObservable::ReleaseTransactionLock(CRepositoryTransactor& aTransactor,TUid aRepositoryUid)

   875     {

   876     CObservable::TSharedRepositoryInfo* shrepinfo = SharedRepositoryInfo(aRepositoryUid);

   877     ASSERT(shrepinfo);

   878     if (aTransactor.IsInActiveConcurrentReadWriteTransaction())

   879         {

   880         shrepinfo->iNumActiveConcurrentReadWriteTransactions--;

   881         ASSERT(shrepinfo->iNumActiveConcurrentReadWriteTransactions >= 0); // sanity check

   882         }

   883     else if (aTransactor.IsInActiveReadTransaction())

   884         {

   885         shrepinfo->iPessimisticTransactionLockCount--;

   886         ASSERT(shrepinfo->iPessimisticTransactionLockCount >= 0); // sanity check

   887         }

   888     else if (aTransactor.IsInActiveExclusiveReadWriteTransaction())

   889         {

   890         // can only be one exclusive read/write transaction active (lock value -1)

   891         ASSERT(shrepinfo->iPessimisticTransactionLockCount == -1);

   892         shrepinfo->iPessimisticTransactionLockCount = 0;

   893         }

   894     }