diff options
Diffstat (limited to 'src/pipe_writer.hpp')
-rw-r--r-- | src/pipe_writer.hpp | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/src/pipe_writer.hpp b/src/pipe_writer.hpp new file mode 100644 index 0000000..3b4b4cd --- /dev/null +++ b/src/pipe_writer.hpp @@ -0,0 +1,88 @@ +/* + Copyright (c) 2007-2009 FastMQ Inc. + + 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 __ZS_PIPE_WRITER_HPP_INCLUDED__ +#define __ZS_PIPE_WRITER_HPP_INCLUDED__ + +#include "object.hpp" +#include "stdint.hpp" + +namespace zs +{ + + class pipe_writer_t : public object_t + { + // Dispatcher is a friend so that it can create & destroy the writer. + // By making constructor & destructor private we are sure that nobody + // except dispatcher messes with writers. + friend class dispatcher_t; + + public: + + // Set & get index in the associated demux object. + void set_demux (struct i_demux *demux_); + void set_index (int index_); + int get_index (); + + // Writes a message to the underlying pipe. Returns false if the + // message cannot be written to the pipe at the moment. + bool write (struct zs_msg *msg_); + + // Flush the messages downsteam. + void flush (); + + // Asks pipe to destroy itself. + void terminate (); + + private: + + pipe_writer_t (class object_t *parent_, class pipe_t *pipe_, + class object_t *peer_, uint64_t hwm_, uint64_t lwm_); + ~pipe_writer_t (); + + void process_head (uint64_t bytes_); + void process_terminate (); + + // The underlying pipe. + class pipe_t *pipe; + + // Pipe reader associated with the other side of the pipe. + class object_t *peer; + + // Associated demux object. + struct i_demux *demux; + + // Index in the associated demux object. + int index; + + // High and low watermarks for in-memory storage (in bytes). + uint64_t hwm; + uint64_t lwm; + + // Positions of head and tail of the pipe (in bytes). + uint64_t head; + uint64_t tail; + + pipe_writer_t (const pipe_writer_t&); + void operator = (const pipe_writer_t&); + }; + +} + +#endif |