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/*
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_READER_HPP_INCLUDED__
#define __ZS_PIPE_READER_HPP_INCLUDED__
#include "object.hpp"
#include "stdint.hpp"
namespace zs
{
class pipe_reader_t : public object_t
{
// Dispatcher is a friend so that it can create & destroy the reader.
// By making constructor & destructor private we are sure that nobody
// except dispatcher messes with readers.
friend class dispatcher_t;
public:
// Set & get index in the associated mux object.
void set_mux (struct i_mux *mux_);
void set_index (int index_);
int get_index ();
// Reads a message to the underlying pipe.
bool read (struct zs_msg *msg_);
// Asks pipe to destroy itself.
void terminate ();
private:
pipe_reader_t (class object_t *parent_, class pipe_t *pipe_,
uint64_t hwm_, uint64_t lwm_);
~pipe_reader_t ();
// Second step of reader construction. The parameter cannot be passed
// in constructor as peer object doesn't yet exist at the time.
void set_peer (class object_t *peer_);
void process_tail (uint64_t bytes_);
void process_terminate_ack ();
// The underlying pipe.
class pipe_t *pipe;
// Pipe writer associated with the other side of the pipe.
class object_t *peer;
// Associated mux object.
struct i_mux *mux;
// Index in the associated mux 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;
uint64_t last_sent_head;
pipe_reader_t (const pipe_reader_t&);
void operator = (const pipe_reader_t&);
};
}
#endif
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