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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/>.
**/
#pragma once
#include "../Common/DatabaseManager.h"
#include <orthanc/OrthancCDatabasePlugin.h>
#include <boost/thread/mutex.hpp>
namespace OrthancDatabases
{
class StorageBackend : public boost::noncopyable
{
public:
class IFileContentVisitor : public boost::noncopyable
{
public:
virtual ~IFileContentVisitor()
{
}
virtual void Assign(const std::string& content) = 0;
virtual bool IsSuccess() const = 0;
};
class IAccessor : public boost::noncopyable
{
public:
virtual ~IAccessor()
{
}
virtual void Create(const std::string& uuid,
const void* content,
size_t size,
OrthancPluginContentType type) = 0;
virtual void ReadWhole(IFileContentVisitor& visitor,
const std::string& uuid,
OrthancPluginContentType type) = 0;
virtual void ReadRange(IFileContentVisitor& visitor,
const std::string& uuid,
OrthancPluginContentType type,
uint64_t start,
size_t length) = 0;
virtual void Remove(const std::string& uuid,
OrthancPluginContentType type) = 0;
};
/**
* This class is similar to
* "Orthanc::StatelessDatabaseOperations": It handles retries of
* transactions in the case of collision between multiple
* readers/writers.
**/
class IDatabaseOperation : public boost::noncopyable
{
public:
virtual ~IDatabaseOperation()
{
}
virtual void Execute(IAccessor& accessor) = 0;
};
class ReadWholeOperation;
private:
class StringVisitor;
boost::mutex mutex_;
DatabaseManager manager_;
unsigned int maxRetries_;
protected:
class AccessorBase : public IAccessor
{
private:
boost::mutex::scoped_lock lock_;
DatabaseManager& manager_;
public:
explicit AccessorBase(StorageBackend& backend) :
lock_(backend.mutex_),
manager_(backend.manager_)
{
}
DatabaseManager& GetManager() const
{
return manager_;
}
virtual void Create(const std::string& uuid,
const void* content,
size_t size,
OrthancPluginContentType type) ORTHANC_OVERRIDE;
virtual void ReadWhole(IFileContentVisitor& visitor,
const std::string& uuid,
OrthancPluginContentType type) ORTHANC_OVERRIDE;
virtual void ReadRange(IFileContentVisitor& visitor,
const std::string& uuid,
OrthancPluginContentType type,
uint64_t start,
size_t length) ORTHANC_OVERRIDE;
virtual void Remove(const std::string& uuid,
OrthancPluginContentType type) ORTHANC_OVERRIDE;
};
virtual bool HasReadRange() const = 0;
public:
StorageBackend(IDatabaseFactory* factory /* takes ownership */,
unsigned int maxRetries);
virtual ~StorageBackend()
{
}
virtual IAccessor* CreateAccessor()
{
return new AccessorBase(*this);
}
static void Register(OrthancPluginContext* context,
StorageBackend* backend); // Takes ownership
static void Finalize();
// For unit tests
static void ReadWholeToString(std::string& target,
IAccessor& accessor,
const std::string& uuid,
OrthancPluginContentType type);
// For unit tests
static void ReadRangeToString(std::string& target,
IAccessor& accessor,
const std::string& uuid,
OrthancPluginContentType type,
uint64_t start,
size_t length);
unsigned int GetMaxRetries() const
{
return maxRetries_;
}
void Execute(IDatabaseOperation& operation);
};
}
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