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/**
* Orthanc - A Lightweight, RESTful DICOM Store
* Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
* Department, University Hospital of Liege, Belgium
* Copyright (C) 2017-2023 Osimis S.A., Belgium
* Copyright (C) 2021-2023 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
*
* This program is free software: you can redistribute it and/or
* modify it under the terms of the GNU Affero General Public License
* as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
**/
#include "IndexConnectionsPool.h"
namespace OrthancDatabases
{
class IndexConnectionsPool::ManagerReference : public Orthanc::IDynamicObject
{
private:
DatabaseManager* manager_;
public:
explicit ManagerReference(DatabaseManager& manager) :
manager_(&manager)
{
}
DatabaseManager& GetManager()
{
assert(manager_ != NULL);
return *manager_;
}
};
IndexConnectionsPool::IndexConnectionsPool(IndexBackend* backend,
size_t countConnections) :
backend_(backend),
countConnections_(countConnections)
{
if (countConnections == 0)
{
throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange,
"There must be a non-zero number of connections to the database");
}
else if (backend == NULL)
{
throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
}
else
{
context_ = backend_->GetContext();
}
}
IndexConnectionsPool::~IndexConnectionsPool()
{
for (std::list<DatabaseManager*>::iterator
it = connections_.begin(); it != connections_.end(); ++it)
{
assert(*it != NULL);
delete *it;
}
}
void IndexConnectionsPool::OpenConnections(bool hasIdentifierTags,
const std::list<IdentifierTag>& identifierTags)
{
boost::unique_lock<boost::shared_mutex> lock(connectionsMutex_);
if (connections_.size() == 0)
{
assert(backend_.get() != NULL);
{
std::unique_ptr<DatabaseManager> manager(new DatabaseManager(backend_->CreateDatabaseFactory()));
manager->GetDatabase(); // Make sure to open the database connection
backend_->ConfigureDatabase(*manager, hasIdentifierTags, identifierTags);
connections_.push_back(manager.release());
}
for (size_t i = 1; i < countConnections_; i++)
{
connections_.push_back(new DatabaseManager(backend_->CreateDatabaseFactory()));
connections_.back()->GetDatabase(); // Make sure to open the database connection
}
for (std::list<DatabaseManager*>::iterator
it = connections_.begin(); it != connections_.end(); ++it)
{
assert(*it != NULL);
availableConnections_.Enqueue(new ManagerReference(**it));
}
}
else
{
throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
}
}
void IndexConnectionsPool::CloseConnections()
{
boost::unique_lock<boost::shared_mutex> lock(connectionsMutex_);
if (connections_.size() != countConnections_)
{
throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
}
else if (availableConnections_.GetSize() != countConnections_)
{
throw Orthanc::OrthancException(Orthanc::ErrorCode_Database, "Some connections are still in use, bug in the Orthanc core");
}
else
{
for (std::list<DatabaseManager*>::iterator
it = connections_.begin(); it != connections_.end(); ++it)
{
assert(*it != NULL);
(*it)->Close();
}
}
}
IndexConnectionsPool::Accessor::Accessor(IndexConnectionsPool& pool) :
lock_(pool.connectionsMutex_),
pool_(pool),
manager_(NULL)
{
for (;;)
{
std::unique_ptr<Orthanc::IDynamicObject> manager(pool.availableConnections_.Dequeue(100));
if (manager.get() != NULL)
{
manager_ = &dynamic_cast<ManagerReference&>(*manager).GetManager();
return;
}
}
}
IndexConnectionsPool::Accessor::~Accessor()
{
assert(manager_ != NULL);
pool_.availableConnections_.Enqueue(new ManagerReference(*manager_));
}
IndexBackend& IndexConnectionsPool::Accessor::GetBackend() const
{
return *pool_.backend_;
}
DatabaseManager& IndexConnectionsPool::Accessor::GetManager() const
{
assert(manager_ != NULL);
return *manager_;
}
}
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