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Diffstat (limited to 'bindings/cpp')
| -rw-r--r-- | bindings/cpp/zmq.hpp | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/bindings/cpp/zmq.hpp b/bindings/cpp/zmq.hpp new file mode 100644 index 0000000..471d1d8 --- /dev/null +++ b/bindings/cpp/zmq.hpp @@ -0,0 +1,283 @@ +/* + 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 |