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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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