//
// SessionImpl.h
//
// $Id: //poco/Main/Data/include/Poco/Data/SessionImpl.h#5 $
//
// Library: Data
// Package: DataCore
// Module:  SessionImpl
//
// Definition of the SessionImpl class.
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#ifndef Data_SessionImpl_INCLUDED
#define Data_SessionImpl_INCLUDED


#include "Poco/Data/Data.h"
#include "Poco/RefCountedObject.h"
#include "Poco/String.h"
#include "Poco/Format.h"
#include "Poco/Any.h"


namespace Poco {
namespace Data {


class StatementImpl;


class Data_API SessionImpl: public Poco::RefCountedObject
	/// Interface for Session functionality that subclasses must extend. 
	/// SessionImpl objects are noncopyable.
{
public:
	static const std::size_t LOGIN_TIMEOUT_INFINITE = 0;
		/// Infinite connection/login timeout.

	static const std::size_t LOGIN_TIMEOUT_DEFAULT = 60;
		/// Default connection/login timeout in seconds.

	static const std::size_t CONNECTION_TIMEOUT_INFINITE = 0;
		/// Infinite connection/login timeout.

	static const std::size_t CONNECTION_TIMEOUT_DEFAULT = CONNECTION_TIMEOUT_INFINITE;
		/// Default connection/login timeout in seconds.

	SessionImpl(const std::string& connectionString,
		std::size_t timeout = LOGIN_TIMEOUT_DEFAULT);
		/// Creates the SessionImpl.

	virtual ~SessionImpl();
		/// Destroys the SessionImpl.

	virtual StatementImpl* createStatementImpl() = 0;
		/// Creates a StatementImpl.

	virtual void open(const std::string& connectionString = "") = 0;
		/// Opens the session using the supplied string.
		/// Can also be used with default empty string to reconnect 
		/// a disconnected session.
		/// If the connection is not established within requested timeout 
		/// (specified in seconds), a ConnectionFailedException is thrown. 
		/// Zero timout means indefinite

	virtual void close() = 0;
		/// Closes the connection.

	virtual bool isConnected() = 0;
		/// Returns true if session is connected, false otherwise.

	void setLoginTimeout(std::size_t timeout);
		/// Sets the session login timeout value.

	std::size_t getLoginTimeout() const;
		/// Returns the session login timeout value.

	virtual void setConnectionTimeout(std::size_t timeout) = 0;
		/// Sets the session connection timeout value.

	virtual std::size_t getConnectionTimeout() = 0;
		/// Returns the session connection timeout value.

	void reconnect();
		/// Closes the connection and opens it again.

	virtual void begin() = 0;
		/// Starts a transaction.

	virtual void commit() = 0;
		/// Commits and ends a transaction.

	virtual void rollback() = 0;
		/// Aborts a transaction.

	virtual bool canTransact() = 0;
		/// Returns true if session has transaction capabilities.

	virtual bool isTransaction() = 0;
		/// Returns true iff a transaction is a transaction is in progress, false otherwise.

	virtual void setTransactionIsolation(Poco::UInt32) = 0;
		/// Sets the transaction isolation level.

	virtual Poco::UInt32 getTransactionIsolation() = 0;
		/// Returns the transaction isolation level.

	virtual bool hasTransactionIsolation(Poco::UInt32) = 0;
		/// Returns true iff the transaction isolation level corresponding
		/// to the supplied bitmask is supported.

	virtual bool isTransactionIsolation(Poco::UInt32) = 0;
		/// Returns true iff the transaction isolation level corresponds
		/// to the supplied bitmask.

	virtual const std::string& connectorName() = 0;
		/// Returns the name of the connector.

	const std::string& connectionString();
		/// Returns the connection string.

	static std::string uri(const std::string& connector, const std::string& connectionString);
		/// Returns formatted URI.

	std::string uri();
		/// Returns the URI for this session.

	virtual void setFeature(const std::string& name, bool state) = 0;
		/// Set the state of a feature.
		///
		/// Features are a generic extension mechanism for session implementations.
		/// and are defined by the underlying SessionImpl instance.
		///
		/// Throws a NotSupportedException if the requested feature is
		/// not supported by the underlying implementation.
	
	virtual bool getFeature(const std::string& name) = 0;
		/// Look up the state of a feature.
		///
		/// Features are a generic extension mechanism for session implementations.
		/// and are defined by the underlying SessionImpl instance.
		///
		/// Throws a NotSupportedException if the requested feature is
		/// not supported by the underlying implementation.

	virtual void setProperty(const std::string& name, const Poco::Any& value) = 0;
		/// Set the value of a property.
		///
		/// Properties are a generic extension mechanism for session implementations.
		/// and are defined by the underlying SessionImpl instance.
		///
		/// Throws a NotSupportedException if the requested property is
		/// not supported by the underlying implementation.

	virtual Poco::Any getProperty(const std::string& name) = 0;
		/// Look up the value of a property.
		///
		/// Properties are a generic extension mechanism for session implementations.
		/// and are defined by the underlying SessionImpl instance.
		///
		/// Throws a NotSupportedException if the requested property is
		/// not supported by the underlying implementation.

protected:
	void setConnectionString(const std::string& connectionString);
		/// Sets the connection string. Should only be called on
		/// disconnetced sessions. Throws InvalidAccessException when called on
		/// a connected session.

private:
	SessionImpl();
	SessionImpl(const SessionImpl&);
	SessionImpl& operator = (const SessionImpl&);

	std::string _connectionString;
	std::size_t _loginTimeout;
};


//
// inlines
//
inline const std::string& SessionImpl::connectionString()
{
	return _connectionString;
}


inline void SessionImpl::setLoginTimeout(std::size_t timeout)
{
	_loginTimeout = timeout;
}


inline std::size_t SessionImpl::getLoginTimeout() const
{
	return _loginTimeout;
}


inline std::string SessionImpl::uri(const std::string& connector,
	const std::string& connectionString)
{
	return format("%s:///%s", toLower(connector), connectionString);
}


inline std::string SessionImpl::uri()
{
	return uri(connectorName(), connectionString());
}


} } // namespace Poco::Data


#endif // Data_SessionImpl_INCLUDED