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RAII transactions

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This commit is contained in:
Blue 2023-10-17 18:06:11 -03:00
parent a9aa6b549f
commit de741eda21
Signed by untrusted user: blue
GPG key ID: 9B203B252A63EE38
22 changed files with 689 additions and 222 deletions
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55
src/storage.cpp
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@ -56,6 +56,23 @@ void LMDBAL::iStorage::close() {
mdb_dbi_close(db->environment, dbi);
}
/**
* \brief Checks if the transaction is still active, returns inner TransactionID
*
* This method is for internal usage only
*
* \param[in] txn - a transaction, you want to extract ID from
* \param[in] action - a description of what you're going to do, in case of exception the error description will be verbose
* \returns - Transaction inner TransactionID
*
* \exception LMDBAL::TransactionTerminated thrown if the passed transaction not active, any action with it's inner ID is an error
*/
LMDBAL::TransactionID LMDBAL::iStorage::extractTransactionId(const Transaction& txn, const std::string& action) const {
if (!txn.isActive())
throw TransactionTerminated(db->name, name, action);
return txn.txn;
}
/**
* \brief Drops content of a storage interface
@ -68,7 +85,7 @@ void LMDBAL::iStorage::close() {
void LMDBAL::iStorage::drop() {
ensureOpened(dropMethodName);
TransactionID txn = db->beginTransaction();
TransactionID txn = beginTransaction();
int rc = iStorage::drop(txn);
if (rc != MDB_SUCCESS) {
abortTransaction(txn);
@ -76,6 +93,7 @@ void LMDBAL::iStorage::drop() {
}
db->commitTransaction(txn);
handleDrop();
}
/**
@ -90,6 +108,21 @@ int LMDBAL::iStorage::drop(TransactionID transaction) {
return mdb_drop(transaction, dbi, 0);
}
/**
* \brief Drops content of a storage interface (public transaction variant)
*
* Just performs content drop
*
* \param[in] txn - transaction ID, must be writable transaction!
* \returns MDB_SUCCESS if everything went fine, MDB_<error> code otherwise
*
* \exception LMDBAL::TransactionTerminated thrown if the transaction was not active
*/
int LMDBAL::iStorage::drop(const WriteTransaction& txn) {
ensureOpened(dropMethodName);
return drop(extractTransactionId(txn, dropMethodName));
}
/**
* \brief Helper function, thows exception if the database is not opened
*
@ -127,7 +160,7 @@ LMDBAL::SizeType LMDBAL::iStorage::count() const {
}
/**
* \brief Storage size (transaction variant)
* \brief Storage size (private transaction variant)
*
* \param[in] txn - transaction ID, can be read-only transaction
* \returns amount of records in the storage
@ -143,6 +176,21 @@ LMDBAL::SizeType LMDBAL::iStorage::count(TransactionID txn) const {
return stat.ms_entries;
}
/**
* \brief Storage size (public transaction variant)
*
* \param[in] txn - transaction, can be read-only transaction
* \returns amount of records in the storage
*
* \exception LMDBAL::Closed thrown if the database was closed
* \exception LMDBAL::Unknown thrown if something unexpected happened
* \exception LMDBAL::TransactionTerminated thrown if the passed transaction not active, any action with it's inner ID is an error
*/
LMDBAL::SizeType LMDBAL::iStorage::count(const Transaction& txn) const {
ensureOpened(countMethodName);
return count(extractTransactionId(txn, countMethodName));
}
/**
* \brief Throws LMDBAL::Exist or LMDBAL::Unknown (transaction vairiant)
*
@ -391,5 +439,4 @@ void LMDBAL::iStorage::transactionCommited(LMDBAL::TransactionID txn) {
void LMDBAL::iStorage::transactionAborted(LMDBAL::TransactionID txn) const {
UNUSED(txn);}
void LMDBAL::iStorage::handleDrop() {}