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some ideas about transaction

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This commit is contained in:
Blue 2023-04-02 16:00:21 +03:00
parent a4bb7e6269
commit f0779ae2aa
Signed by: blue
GPG key ID: 9B203B252A63EE38
7 changed files with 125 additions and 65 deletions
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101
src/base.cpp
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@ -20,12 +20,14 @@
#include "exceptions.h"
#include "storage.h"
#define UNUSED(x) (void)(x)
LMDBAL::Base::Base(const QString& p_name, uint16_t mapSize):
name(p_name.toStdString()),
opened(false),
size(mapSize),
environment(),
tables(),
storages(),
transactions(new Transactions())
{}
@ -34,18 +36,18 @@ LMDBAL::Base::~Base() {
delete transactions;
for (const std::pair<const std::string, iStorage*>& pair : tables)
for (const std::pair<const std::string, iStorage*>& pair : storages)
delete pair.second;
}
void LMDBAL::Base::close() {
if (opened) {
for (LMDBAL::TransactionID id : *transactions)
mdb_txn_abort(id);
abortTransaction(id, emptyName);
for (const std::pair<const std::string, iStorage*>& pair : tables) {
iStorage* table = pair.second;
mdb_dbi_close(environment, table->dbi);
for (const std::pair<const std::string, iStorage*>& pair : storages) {
iStorage* storage = pair.second;
mdb_dbi_close(environment, storage->dbi);
}
mdb_env_close(environment);
transactions->clear();
@ -61,20 +63,18 @@ void LMDBAL::Base::open() {
mdb_env_create(&environment);
QString path = createDirectory();
mdb_env_set_maxdbs(environment, tables.size());
mdb_env_set_maxdbs(environment, storages.size());
mdb_env_set_mapsize(environment, size * 1024UL * 1024UL);
mdb_env_open(environment, path.toStdString().c_str(), 0, 0664);
MDB_txn *txn;
mdb_txn_begin(environment, NULL, 0, &txn);
for (const std::pair<const std::string, iStorage*>& pair : tables) {
iStorage* table = pair.second;
int rc = table->createTable(txn);
TransactionID txn = beginPrivateTransaction(emptyName);
for (const std::pair<const std::string, iStorage*>& pair : storages) {
iStorage* storage = pair.second;
int rc = storage->createStorage(txn);
if (rc)
throw Unknown(name, mdb_strerror(rc));
}
mdb_txn_commit(txn);
commitPrivateTransaction(txn, emptyName);
opened = true;
}
}
@ -120,18 +120,13 @@ void LMDBAL::Base::drop() {
if (!opened)
throw Closed("drop", name);
MDB_txn *txn;
int rc = mdb_txn_begin(environment, NULL, 0, &txn);
if (rc)
throw Unknown(name, mdb_strerror(rc));
for (const std::pair<const std::string, iStorage*>& pair : tables) {
rc = pair.second->drop(txn);
TransactionID txn = beginPrivateTransaction(emptyName);
for (const std::pair<const std::string, iStorage*>& pair : storages) {
int rc = pair.second->drop(txn);
if (rc)
throw Unknown(name, mdb_strerror(rc), pair.first);
}
mdb_txn_commit(txn);
commitPrivateTransaction(txn, emptyName);
}
LMDBAL::TransactionID LMDBAL::Base::beginReadOnlyTransaction() const {
@ -146,18 +141,15 @@ void LMDBAL::Base::abortTransaction(LMDBAL::TransactionID id) const {
void LMDBAL::Base::commitTransaction(LMDBAL::TransactionID id) const {
return commitTransaction(id, emptyName);}
LMDBAL::TransactionID LMDBAL::Base::beginReadOnlyTransaction(const std::string& storageName) const {
if (!opened)
throw Closed("beginReadOnlyTransaction", name, storageName);
MDB_txn* txn;
int rc = mdb_txn_begin(environment, NULL, MDB_RDONLY, &txn);
if (rc) {
mdb_txn_abort(txn);
throw Unknown(name, mdb_strerror(rc), storageName);
}
TransactionID txn = beginPrivateReadOnlyTransaction(storageName);
transactions->emplace(txn);
for (const std::pair<const std::string, LMDBAL::iStorage*>& pair : storages)
pair.second->transactionStarted(txn, true);
return txn;
}
@ -165,13 +157,11 @@ LMDBAL::TransactionID LMDBAL::Base::beginTransaction(const std::string& storageN
if (!opened)
throw Closed("beginTransaction", name, storageName);
MDB_txn* txn;
int rc = mdb_txn_begin(environment, NULL, 0, &txn);
if (rc) {
mdb_txn_abort(txn);
throw Unknown(name, mdb_strerror(rc), storageName);
}
TransactionID txn = beginPrivateTransaction(storageName);
transactions->emplace(txn);
for (const std::pair<const std::string, LMDBAL::iStorage*>& pair : storages)
pair.second->transactionStarted(txn, false);
return txn;
}
@ -183,7 +173,10 @@ void LMDBAL::Base::abortTransaction(LMDBAL::TransactionID id, const std::string&
if (itr == transactions->end()) //TODO may be it's a good idea to make an exception class for this
throw Unknown(name, "unable to abort transaction: transaction was not found", storageName);
mdb_txn_abort(id);
abortPrivateTransaction(id, storageName);
for (const std::pair<const std::string, LMDBAL::iStorage*>& pair : storages)
pair.second->transactionAborted(id);
transactions->erase(itr);
}
@ -195,8 +188,40 @@ void LMDBAL::Base::commitTransaction(LMDBAL::TransactionID id, const std::string
if (itr == transactions->end()) //TODO may be it's a good idea to make an exception class for this
throw Unknown(name, "unable to commit transaction: transaction was not found", storageName);
int rc = mdb_txn_commit(id);
commitPrivateTransaction(id, storageName);
for (const std::pair<const std::string, LMDBAL::iStorage*>& pair : storages)
pair.second->transactionCommited(id);
transactions->erase(itr);
}
LMDBAL::TransactionID LMDBAL::Base::beginPrivateReadOnlyTransaction(const std::string& storageName) const {
MDB_txn* txn;
int rc = mdb_txn_begin(environment, NULL, MDB_RDONLY, &txn);
if (rc) {
mdb_txn_abort(txn);
throw Unknown(name, mdb_strerror(rc), storageName);
}
return txn;
}
LMDBAL::TransactionID LMDBAL::Base::beginPrivateTransaction(const std::string& storageName) const {
MDB_txn* txn;
int rc = mdb_txn_begin(environment, NULL, 0, &txn);
if (rc) {
mdb_txn_abort(txn);
throw Unknown(name, mdb_strerror(rc), storageName);
}
return txn;
}
void LMDBAL::Base::abortPrivateTransaction(LMDBAL::TransactionID id, const std::string& storageName) const {
UNUSED(storageName);
mdb_txn_abort(id);
}
void LMDBAL::Base::commitPrivateTransaction(LMDBAL::TransactionID id, const std::string& storageName) const {
int rc = mdb_txn_commit(id);
if (rc != MDB_SUCCESS)
throw Unknown(name, mdb_strerror(rc), storageName);
}