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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#pragma once
#include <drizzled/catalog/instance.h>
#include <drizzled/catalog/local.h>
#include <drizzled/error_t.h>
#include <drizzled/item.h>
#include <drizzled/sql_list.h>
#include <drizzled/visibility.h>
namespace drizzled {
namespace plugin {
/**
* This class allows new client sources to be written. This could be through
* network protocols, in-process threads, or any other client source that can
* provide commands and handle result sets. The current implementation is
* file-descriptor based, so for non-fd client sources (like from another
* thread), derived classes will need to use a pipe() for event notifications.
*/
class DRIZZLED_API Client
{
protected:
Session *session;
public:
virtual ~Client() {}
/**
* Get attached session from the client object.
* @retval Session object that is attached, NULL if none.
*/
virtual Session *getSession(void)
{
return session;
}
/**
* Attach session to the client object.
* @param[in] session_arg Session object to attach, or NULL to clear.
*/
virtual void setSession(Session *session_arg)
{
session= session_arg;
}
/**
* Get file descriptor associated with client object.
* @retval File descriptor that is attached, -1 if none.
*/
virtual int getFileDescriptor(void)= 0;
/**
* Check to see if the client is currently connected.
* @retval Boolean value representing connected state.
*/
virtual bool isConnected(void)= 0;
/**
* Check to see if the client is actively reading.
* @retval Boolean value representing reading state.
*/
virtual bool isReading(void)= 0;
/**
* Check to see if the client is actively writing.
* @retval Boolean value representing writing state.
*/
virtual bool isWriting(void)= 0;
/**
* Flush all data that has been buffered with store() methods.
* @retval Boolean indicating success or failure.
*/
virtual bool flush(void)= 0;
/**
* Close the client object.
*/
virtual void close(void)= 0;
/**
* Perform handshake and authorize client if needed.
*/
virtual bool authenticate(void)= 0;
virtual bool isConsole() const
{
return false;
}
virtual bool isInteractive() const
{
return false;
}
virtual bool isAdmin() const
{
return false;
}
virtual catalog::Instance::shared_ptr catalog()
{
return catalog::local();
}
/**
* Read command from client.
*/
virtual bool readCommand(char **packet, uint32_t *packet_length)= 0;
/* Send responses. */
virtual void sendOK(void)= 0;
virtual void sendEOF(void)= 0;
virtual void sendError(const drizzled::error_t sql_errno, const char *err)= 0;
/**
* Send field list for result set.
*/
virtual bool sendFields(List<Item> *list)= 0;
/* Send result fields in various forms. */
virtual bool store(Field *from)= 0;
virtual bool store(void)= 0;
virtual bool store(int32_t from)= 0;
virtual bool store(uint32_t from)= 0;
virtual bool store(int64_t from)= 0;
virtual bool store(uint64_t from)= 0;
virtual bool store(double from, uint32_t decimals, String *buffer)= 0;
virtual bool store(const type::Time *from);
virtual bool store(const char *from);
virtual bool store(const char *from, size_t length)= 0;
virtual bool store(const std::string &from)
{
return store(from.c_str(), from.size());
}
/* Try to remove these. */
virtual bool haveMoreData(void)= 0;
virtual bool haveError(void)= 0;
virtual bool wasAborted(void)= 0;
};
} /* namespace plugin */
} /* namespace drizzled */
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