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-/*
- Copyright (c) 2007-2011 iMatix Corporation
- Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
-
- This file is part of 0MQ.
-
- 0MQ is free software; you can redistribute it and/or modify it under
- the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- 0MQ 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 Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#ifndef __ZMQ_SWAP_HPP_INCLUDED__
-#define __ZMQ_SWAP_HPP_INCLUDED__
-
-#include "../include/zmq.h"
-
-#include <string>
-#include "stdint.hpp"
-
-namespace zmq
-{
-
- // This class implements a message swap. Messages are retrieved from
- // the swap in the same order as they entered it.
-
- class swap_t
- {
- public:
-
- enum { default_block_size = 8192 };
-
- // Creates the swap.
- swap_t (int64_t filesize_);
-
- ~swap_t ();
-
- int init ();
-
- // Stores the message into the swap. The function
- // returns false if the swap is full; true otherwise.
- bool store (zmq_msg_t *msg_);
-
- // Fetches the oldest message from the swap. It is an error
- // to call this function when the swap is empty.
- void fetch (zmq_msg_t *msg_);
-
- void commit ();
-
- void rollback ();
-
- // Returns true if the swap is empty; false otherwise.
- bool empty ();
-
-
-// // Returns true if and only if the swap is full.
-// bool full ();
-
- // Returns true if the message fits into swap.
- bool fits (zmq_msg_t *msg_);
-
- private:
-
- // Copies data from a memory buffer to the backing file.
- // Wraps around when reaching maximum file size.
- void copy_from_file (void *buffer_, size_t count_);
-
- // Copies data from the backing file to the memory buffer.
- // Wraps around when reaching end-of-file.
- void copy_to_file (const void *buffer_, size_t count_);
-
- // Returns the buffer space available.
- int64_t buffer_space ();
-
- void fill_buf (char *buf, int64_t pos);
-
- void save_write_buf ();
-
- // File descriptor to the backing file.
- int fd;
-
- // Name of the backing file.
- std::string filename;
-
- // Maximum size of the backing file.
- int64_t filesize;
-
- // File offset associated with the fd file descriptor.
- int64_t file_pos;
-
- // File offset the next message will be stored at.
- int64_t write_pos;
-
- // File offset the next message will be read from.
- int64_t read_pos;
-
- int64_t commit_pos;
-
- size_t block_size;
-
- char *buf1;
- char *buf2;
- char *read_buf;
- char *write_buf;
-
- int64_t write_buf_start_addr;
-
- // Disable copying of the swap object.
- swap_t (const swap_t&);
- const swap_t &operator = (const swap_t&);
- };
-
-}
-
-#endif