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* This software may be used and distributed according to the terms of

* the New BSD License, which is incorporated herein by reference.

#include "tdatabasecontext.h"

#include "tkvsdatabasepool.h"

#include "tsqldatabasepool.h"

#include "tsystemglobal.h"

#include <TKvsDriver>

#include <TCache>

#include <TSystemGlobal>

#include <TWebApplication>

#include <QSqlDatabase>

#include <QtCore>

#include <ctime>

#include <thread>

namespace {

// Stores a pointer to current database context into TLS

thread_local TDatabaseContext *databaseContextPtrTls = nullptr;

}

/*!

\class TDatabaseContext

\brief The TDatabaseContext class is the base class of contexts for

database access.

TDatabaseContext::TDatabaseContext()

{

const int count = Tf::app()->sqlDatabaseSettingsCount();

if (sqlTransactions.size() < (size_t)count) {

sqlTransactions.resize(count);

}

if (kvsDatabases.size() < (size_t)Tf::KvsEngine::Num) {

kvsDatabases.resize((size_t)Tf::KvsEngine::Num);

}

TDatabaseContext::~TDatabaseContext()

{

release();

delete cachep;

}

TSqlDatabase &TDatabaseContext::getSqlDatabase(int id)

{

if (id < 0) {

throw RuntimeException("error database id", __FILE__, __LINE__);

}

if (id >= Tf::app()->sqlDatabaseSettingsCount()) {

throw RuntimeException("error database id", __FILE__, __LINE__);

}

TSqlTransaction &tx = sqlTransactions[id];

TSqlDatabase::Handle &handle = tx.database();

if (handle && handle->isValid()) {

return *handle;

}

int n = 0;

do {

if (!handle || !handle->isValid()) {

handle = TSqlDatabasePool::instance()->database(id);

}

if (tx.begin()) {

break;

}

handle = TSqlDatabase::Handle{};

} while (++n < 2); // try two times

idleElapsed = (uint)std::time(nullptr);

return *handle;

}

void TDatabaseContext::releaseSqlDatabases()

{

rollbackTransactions();

for (auto &tx : sqlTransactions) {

if (tx.database()) {

tx.database() = TSqlDatabase::Handle{};

}

TKvsDatabase::Handle &TDatabaseContext::getKvsDatabase(Tf::KvsEngine engine)

{

auto &handle = kvsDatabases[(int)engine];

if (!handle || !handle->isValid()) {

handle = TKvsDatabasePool::instance()->database(engine);

}

idleElapsed = (uint)std::time(nullptr);

return handle;

}

void TDatabaseContext::releaseKvsDatabases()

{

for (auto &handle : kvsDatabases) {

if (handle) {

handle = TKvsDatabase::Handle{};

}

void TDatabaseContext::release()

{

// Releases all SQL database sessions

releaseSqlDatabases();

// Releases all KVS database sessions

releaseKvsDatabases();

idleElapsed = 0;

}

void TDatabaseContext::setTransactionEnabled(bool enable, int id)

{

if (id < 0 || id >= (int)sqlTransactions.size()) {

Tf::error("Invalid database ID: {}", id);

return;

}

sqlTransactions[id].setEnabled(enable);

}

void TDatabaseContext::commitTransactions()

{

for (auto it = sqlTransactions.begin(); it != sqlTransactions.end(); ++it) {

it->commit();

}

bool TDatabaseContext::commitTransaction(int id)

{

bool res = false;

if (id < 0 || id >= (int)sqlTransactions.size()) {

Tf::error("Failed to commit transaction. Invalid database ID: {}", id);

return res;

}

TSqlTransaction &tx = sqlTransactions[id];

res = tx.commit();

return res;

}

void TDatabaseContext::rollbackTransactions()

{

for (auto it = sqlTransactions.begin(); it != sqlTransactions.end(); ++it) {

it->rollback();

}

bool TDatabaseContext::rollbackTransaction(int id)

{

bool res = false;

if (id < 0 || id >= (int)sqlTransactions.size()) {

Tf::error("Failed to rollback transaction. Invalid database ID: {}", id);

return res;

}

res = sqlTransactions[id].rollback();

return res;

}

int TDatabaseContext::idleTime() const

{

return (idleElapsed > 0) ? (uint)std::time(nullptr) - idleElapsed : -1;

}

TDatabaseContext *TDatabaseContext::currentDatabaseContext()

{

return databaseContextPtrTls;

}

void TDatabaseContext::setCurrentDatabaseContext(TDatabaseContext *context)

{

if (context && databaseContextPtrTls) {

tSystemWarn("Duplicate set : setCurrentDatabaseContext()");

}

databaseContextPtrTls = context;

}

TCache *TDatabaseContext::cache()

{

if (!cachep) {

cachep = new TCache;

}

return cachep;

}

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