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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 __ZMQ_HPP_INCLUDED__
-#define __ZMQ_HPP_INCLUDED__
-
-#include "zmq.h"
-
-#include <assert.h>
-#include <errno.h>
-#include <string.h>
-#include <exception>
-
-namespace zmq
-{
-
- typedef zmq_free_fn free_fn;
-
- enum message_type_t
- {
- message_data = 1 << 0,
- message_gap = 1 << ZMQ_GAP,
- message_delimiter = 1 << ZMQ_DELIMITER
- };
-
- // The class masquerades POSIX-style errno error as a C++ exception.
- class error_t : public std::exception
- {
- public:
-
- error_t () : errnum (errno) {}
-
- virtual const char *what () const throw ()
- {
-#if defined _MSC_VER
-#pragma warning (push)
-#pragma warning (disable:4996)
-#endif
- return strerror (errnum);
-#if defined _MSC_VER
-#pragma warning (pop)
-#endif
- }
-
- private:
-
- int errnum;
- };
-
- // A message. Caution: Don't change the body of the message once you've
- // copied it - the behaviour is undefined. Don't change the body of the
- // received message either - other threads may be accessing it in parallel.
-
- class message_t : private zmq_msg_t
- {
- friend class socket_t;
-
- public:
-
- // Creates message size_ bytes long.
- inline message_t (size_t size_ = 0)
- {
- int rc = zmq_msg_init_size (this, size_);
- if (rc != 0)
- throw error_t ();
- }
-
- // Creates message from the supplied buffer. 0MQ takes care of
- // deallocating the buffer once it is not needed. The deallocation
- // function is supplied in ffn_ parameter. If ffn_ is NULL, no
- // deallocation happens - this is useful for sending static buffers.
- inline message_t (void *data_, size_t size_,
- free_fn *ffn_)
- {
- int rc = zmq_msg_init_data (this, data_, size_, ffn_);
- if (rc != 0)
- throw error_t ();
- }
-
- // Destroys the message.
- inline ~message_t ()
- {
- int rc = zmq_msg_close (this);
- if (rc != 0)
- throw error_t ();
- }
-
- // Destroys old content of the message and allocates buffer for the
- // new message body. Having this as a separate function allows user
- // to reuse once-allocated message for multiple times.
- inline void rebuild (size_t size_)
- {
- int rc = zmq_msg_close (this);
- if (rc != 0)
- throw error_t ();
- rc = zmq_msg_init_size (this, size_);
- if (rc != 0)
- throw error_t ();
- }
-
- // Same as above, however, the message is rebuilt from the supplied
- // buffer. See appropriate constructor for discussion of buffer
- // deallocation mechanism.
- inline void rebuild (void *data_, size_t size_, free_fn *ffn_)
- {
- int rc = zmq_msg_close (this);
- if (rc != 0)
- throw error_t ();
- rc = zmq_msg_init_data (this, data_, size_, ffn_);
- if (rc != 0)
- throw error_t ();
- }
-
- // Moves the message content from one message to the another. If the
- // destination message have contained data prior to the operation
- // these get deallocated. The source message will contain 0 bytes
- // of data after the operation.
- inline void move_to (message_t *msg_)
- {
- int rc = zmq_msg_move (this, (zmq_msg_t*) msg_);
- if (rc != 0)
- throw error_t ();
- }
-
- // Copies the message content from one message to the another. If the
- // destination message have contained data prior to the operation
- // these get deallocated.
- inline void copy_to (message_t *msg_)
- {
- int rc = zmq_msg_copy (this, (zmq_msg_t*) msg_);
- if (rc != 0)
- throw error_t ();
- }
-
- // Returns message type.
- inline message_type_t type ()
- {
- return (message_type_t) (1 << zmq_msg_type (this));
- }
-
- // Returns pointer to message's data buffer.
- inline void *data ()
- {
- return zmq_msg_data (this);
- }
-
- // Returns the size of message data buffer.
- inline size_t size ()
- {
- return zmq_msg_size (this);
- }
-
- private:
-
- // Disable implicit message copying, so that users won't use shared
- // messages (less efficient) without being aware of the fact.
- message_t (const message_t&);
- void operator = (const message_t&);
- };
-
- class context_t
- {
- friend class socket_t;
-
- public:
-
- inline context_t (int app_threads_, int io_threads_)
- {
- ptr = zmq_init (app_threads_, io_threads_);
- if (ptr == NULL)
- throw error_t ();
- }
-
- inline ~context_t ()
- {
- int rc = zmq_term (ptr);
- assert (rc == 0);
- }
-
- private:
-
- void *ptr;
-
- // Disable copying.
- context_t (const context_t&);
- void operator = (const context_t&);
- };
-
- class socket_t
- {
- public:
-
- inline socket_t (context_t &context_, int type_ = 0)
- {
- ptr = zmq_socket (context_.ptr, type_);
- if (ptr == NULL)
- throw error_t ();
- }
-
- inline ~socket_t ()
- {
- int rc = zmq_close (ptr);
- if (rc != 0)
- throw error_t ();
- }
-
- inline void setsockopt (int option_, const void *optval_,
- size_t optvallen_)
- {
- int rc = zmq_setsockopt (ptr, option_, optval_, optvallen_);
- if (rc != 0)
- throw error_t ();
- }
-
- inline void bind (const char *addr_)
- {
- int rc = zmq_bind (ptr, addr_);
- if (rc != 0)
- throw error_t ();
- }
-
- inline void connect (const char *addr_)
- {
- int rc = zmq_connect (ptr, addr_);
- if (rc != 0)
- throw error_t ();
- }
-
- inline bool send (message_t &msg_, int flags_ = 0)
- {
- int rc = zmq_send (ptr, &msg_, flags_);
- if (rc == 0)
- return true;
- if (rc == -1 && errno == EAGAIN)
- return false;
- throw error_t ();
- }
-
- inline void flush ()
- {
- int rc = zmq_flush (ptr);
- if (rc != 0)
- throw error_t ();
- }
-
- inline bool recv (message_t *msg_, int flags_ = 0)
- {
- int rc = zmq_recv (ptr, msg_, flags_);
- if (rc == 0)
- return true;
- if (rc == -1 && errno == EAGAIN)
- return false;
- throw error_t ();
- }
-
- private:
-
- void *ptr;
-
- // Disable copying.
- socket_t (const socket_t&);
- void operator = (const socket_t&);
- };
-
-}
-
-#endif
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