diff options
author | Martin Lucina <mato@kotelna.sk> | 2010-09-08 15:25:45 +0200 |
---|---|---|
committer | Martin Lucina <martin@lucina.net> | 2012-01-23 08:53:27 +0100 |
commit | 90d73cba9cd1d1724f38ed82fc0eefb1781c9c20 (patch) | |
tree | 1760872164a93384d1adb90db9c8d41777dbb2a7 /src/msg_store.hpp | |
parent | cf026feae205bfeb7e007f6afd0e8d7b283865c8 (diff) | |
parent | 5ba1cb20fe6f6699cef1cc726718e760cd4c9af1 (diff) |
Imported Debian patch 2.0.9.dfsg-1debian/2.0.9.dfsg-1
Diffstat (limited to 'src/msg_store.hpp')
-rw-r--r-- | src/msg_store.hpp | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/src/msg_store.hpp b/src/msg_store.hpp new file mode 100644 index 0000000..765fc60 --- /dev/null +++ b/src/msg_store.hpp @@ -0,0 +1,114 @@ +/* + Copyright (c) 2007-2010 iMatix Corporation + + This file is part of 0MQ. + + 0MQ is free software; you can redistribute it and/or modify it under + the terms of the Lesser GNU 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 + Lesser GNU General Public License for more details. + + You should have received a copy of the Lesser GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#ifndef __ZMQ_MSG_STORE_HPP_INCLUDED__ +#define __ZMQ_MSG_STORE_HPP_INCLUDED__ + +#include "../include/zmq.h" + +#include <string> +#include "stdint.hpp" + +namespace zmq +{ + + // This class implements a message store. Messages are retrieved from + // the store in the same order as they entered it. + + class msg_store_t + { + public: + + enum { default_block_size = 8192 }; + + // Creates message store. + msg_store_t (int64_t filesize_, size_t block_size_ = default_block_size); + + ~msg_store_t (); + + int init (); + + // Stores the message into the message store. The function + // returns false if the message store is full; true otherwise. + bool store (zmq_msg_t *msg_); + + // Fetches the oldest message from the message store. It is an error + // to call this function when the message store is empty. + void fetch (zmq_msg_t *msg_); + + void commit (); + + void rollback (); + + // Returns true if the message store is empty; false otherwise. + bool empty (); + + // Returns true if and only if the store is full. + bool full (); + + 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; + }; + +} + +#endif |