<NME> zmq.hpp
<BEF> ADDFILE
<MSG> ZeroMQ persistent buffer V.1

<DFF> @@ -0,0 +1,582 @@
+/*
+    Copyright (c) 2009-2011 250bpm s.r.o.
+    Copyright (c) 2011 Botond Ballo
+    Copyright (c) 2007-2009 iMatix Corporation
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to
+    deal in the Software without restriction, including without limitation the
+    rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+    sell copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in
+    all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+    IN THE SOFTWARE.
+*/
+
+#ifndef __ZMQ_HPP_INCLUDED__
+#define __ZMQ_HPP_INCLUDED__
+
+#include <zmq.h>
+
+#include <algorithm>
+#include <cassert>
+#include <cstring>
+#include <string>
+#include <exception>
+
+//  Detect whether the compiler supports C++11 rvalue references.
+#if (defined(__GNUC__) && (__GNUC__ > 4 || \
+      (__GNUC__ == 4 && __GNUC_MINOR__ > 2)) && \
+      defined(__GXX_EXPERIMENTAL_CXX0X__))
+    #define ZMQ_HAS_RVALUE_REFS
+    #define ZMQ_DELETED_FUNCTION = delete
+#elif defined(__clang__)
+    #if __has_feature(cxx_rvalue_references)
+        #define ZMQ_HAS_RVALUE_REFS
+    #endif
+
+    #if __has_feature(cxx_deleted_functions)
+        #define ZMQ_DELETED_FUNCTION = delete
+    #else
+        #define ZMQ_DELETED_FUNCTION
+    #endif
+#elif defined(_MSC_VER) && (_MSC_VER >= 1600)
+    #define ZMQ_HAS_RVALUE_REFS
+    #define ZMQ_DELETED_FUNCTION
+#else
+    #define ZMQ_DELETED_FUNCTION
+#endif
+
+#if ZMQ_VERSION >= ZMQ_MAKE_VERSION(3, 3, 0)
+#define ZMQ_NEW_MONITOR_EVENT_LAYOUT
+#endif
+
+#if ZMQ_VERSION >= ZMQ_MAKE_VERSION(4, 1, 0)
+#define ZMQ_HAS_PROXY_STEERABLE
+#endif
+
+// In order to prevent unused variable warnings when building in non-debug
+// mode use this macro to make assertions.
+#ifndef NDEBUG
+#   define ZMQ_ASSERT(expression) assert(expression)
+#else
+#   define ZMQ_ASSERT(expression) (void)(expression)
+#endif
+
+namespace zmq
+{
+
+    typedef zmq_free_fn free_fn;
+    typedef zmq_pollitem_t pollitem_t;
+
+    class error_t : public std::exception
+    {
+    public:
+
+        error_t () : errnum (zmq_errno ()) {}
+
+        virtual const char *what () const throw ()
+        {
+            return zmq_strerror (errnum);
+        }
+
+        int num () const
+        {
+            return errnum;
+        }
+
+    private:
+
+        int errnum;
+    };
+
+    inline int poll (zmq_pollitem_t *items_, int nitems_, long timeout_ = -1)
+    {
+        int rc = zmq_poll (items_, nitems_, timeout_);
+        if (rc < 0)
+            throw error_t ();
+        return rc;
+    }
+
+    inline void proxy (void *frontend, void *backend, void *capture)
+    {
+        int rc = zmq_proxy (frontend, backend, capture);
+        if (rc != 0)
+            throw error_t ();
+    }
+    
+#ifdef ZMQ_HAS_PROXY_STEERABLE
+    inline void proxy_steerable (void *frontend, void *backend, void *capture, void *control)
+    {
+        int rc = zmq_proxy_steerable (frontend, backend, capture, control);
+        if (rc != 0)
+            throw error_t ();
+    }
+#endif
+    
+    inline void version (int *major_, int *minor_, int *patch_)
+    {
+        zmq_version (major_, minor_, patch_);
+    }
+
+    class message_t
+    {
+        friend class socket_t;
+
+    public:
+
+        inline message_t ()
+        {
+            int rc = zmq_msg_init (&msg);
+            if (rc != 0)
+                throw error_t ();
+        }
+
+        inline explicit message_t (size_t size_)
+        {
+            int rc = zmq_msg_init_size (&msg, size_);
+            if (rc != 0)
+                throw error_t ();
+        }
+
+        inline message_t (void *data_, size_t size_, free_fn *ffn_,
+            void *hint_ = NULL)
+        {
+            int rc = zmq_msg_init_data (&msg, data_, size_, ffn_, hint_);
+            if (rc != 0)
+                throw error_t ();
+        }
+
+#ifdef ZMQ_HAS_RVALUE_REFS
+        inline message_t (message_t &&rhs) : msg (rhs.msg)
+        {
+            int rc = zmq_msg_init (&rhs.msg);
+            if (rc != 0)
+                throw error_t ();
+        }
+
+        inline message_t &operator = (message_t &&rhs)
+        {
+            std::swap (msg, rhs.msg);
+            return *this;
+        }
+#endif
+
+        inline ~message_t ()
+        {
+            int rc = zmq_msg_close (&msg);
+            ZMQ_ASSERT (rc == 0);
+        }
+
+        inline void rebuild ()
+        {
+            int rc = zmq_msg_close (&msg);
+            if (rc != 0)
+                throw error_t ();
+            rc = zmq_msg_init (&msg);
+            if (rc != 0)
+                throw error_t ();
+        }
+
+        inline void rebuild (size_t size_)
+        {
+            int rc = zmq_msg_close (&msg);
+            if (rc != 0)
+                throw error_t ();
+            rc = zmq_msg_init_size (&msg, size_);
+            if (rc != 0)
+                throw error_t ();
+        }
+
+        inline void rebuild (void *data_, size_t size_, free_fn *ffn_,
+            void *hint_ = NULL)
+        {
+            int rc = zmq_msg_close (&msg);
+            if (rc != 0)
+                throw error_t ();
+            rc = zmq_msg_init_data (&msg, data_, size_, ffn_, hint_);
+            if (rc != 0)
+                throw error_t ();
+        }
+
+        inline void move (message_t *msg_)
+        {
+            int rc = zmq_msg_move (&msg, &(msg_->msg));
+            if (rc != 0)
+                throw error_t ();
+        }
+
+        inline void copy (message_t *msg_)
+        {
+            int rc = zmq_msg_copy (&msg, &(msg_->msg));
+            if (rc != 0)
+                throw error_t ();
+        }
+
+        inline bool more ()
+        {
+            int rc = zmq_msg_more (&msg);
+            return rc != 0;
+        }
+
+        inline void *data ()
+        {
+            return zmq_msg_data (&msg);
+        }
+
+        inline const void* data () const
+        {
+            return zmq_msg_data (const_cast<zmq_msg_t*>(&msg));
+        }
+
+        inline size_t size () const
+        {
+            return zmq_msg_size (const_cast<zmq_msg_t*>(&msg));
+        }
+
+    private:
+
+        //  The underlying message
+        zmq_msg_t msg;
+
+        //  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 ()
+        {
+            ptr = zmq_ctx_new ();
+            if (ptr == NULL)
+                throw error_t ();
+        }
+
+
+        inline explicit context_t (int io_threads_, int max_sockets_ = ZMQ_MAX_SOCKETS_DFLT)
+        {
+            ptr = zmq_ctx_new ();
+            if (ptr == NULL)
+                throw error_t ();
+
+            int rc = zmq_ctx_set (ptr, ZMQ_IO_THREADS, io_threads_);
+            ZMQ_ASSERT (rc == 0);
+
+            rc = zmq_ctx_set (ptr, ZMQ_MAX_SOCKETS, max_sockets_);
+            ZMQ_ASSERT (rc == 0);
+        }
+
+#ifdef ZMQ_HAS_RVALUE_REFS
+        inline context_t (context_t &&rhs) : ptr (rhs.ptr)
+        {
+            rhs.ptr = NULL;
+        }
+        inline context_t &operator = (context_t &&rhs)
+        {
+            std::swap (ptr, rhs.ptr);
+            return *this;
+        }
+#endif
+
+        inline ~context_t ()
+        {
+            close();
+        }
+
+        inline void close()
+        {
+            if (ptr == NULL)
+                return;
+            int rc = zmq_ctx_destroy (ptr);
+            ZMQ_ASSERT (rc == 0);
+            ptr = NULL;
+        }
+
+        //  Be careful with this, it's probably only useful for
+        //  using the C api together with an existing C++ api.
+        //  Normally you should never need to use this.
+        inline operator void* ()
+        {
+            return ptr;
+        }
+
+    private:
+
+        void *ptr;
+
+        context_t (const context_t&);
+        void operator = (const context_t&);
+    };
+
+    class socket_t
+    {
+        friend class monitor_t;
+    public:
+
+        inline socket_t (context_t &context_, int type_)
+        {
+            ctxptr = context_.ptr;
+            ptr = zmq_socket (context_.ptr, type_);
+            if (ptr == NULL)
+                throw error_t ();
+        }
+
+#ifdef ZMQ_HAS_RVALUE_REFS
+        inline socket_t(socket_t&& rhs) : ptr(rhs.ptr)
+        {
+            rhs.ptr = NULL;
+        }
+        inline socket_t& operator=(socket_t&& rhs)
+        {
+            std::swap(ptr, rhs.ptr);
+            return *this;
+        }
+#endif
+
+        inline ~socket_t ()
+        {
+            close();
+        }
+
+        inline operator void* ()
+        {
+            return ptr;
+        }
+
+        inline void close()
+        {
+            if(ptr == NULL)
+                // already closed
+                return ;
+            int rc = zmq_close (ptr);
+            ZMQ_ASSERT (rc == 0);
+            ptr = 0 ;
+        }
+
+        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 getsockopt (int option_, void *optval_,
+            size_t *optvallen_)
+        {
+            int rc = zmq_getsockopt (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 unbind (const char *addr_)
+        {
+            int rc = zmq_unbind (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 void disconnect (const char *addr_)
+        {
+            int rc = zmq_disconnect (ptr, addr_);
+            if (rc != 0)
+                throw error_t ();
+        }
+
+        inline bool connected()
+        {
+            return(ptr != NULL);
+        }
+        
+        inline size_t send (const void *buf_, size_t len_, int flags_ = 0)
+        {
+            int nbytes = zmq_send (ptr, buf_, len_, flags_);
+            if (nbytes >= 0)
+                return (size_t) nbytes;
+            if (zmq_errno () == EAGAIN)
+                return 0;
+            throw error_t ();
+        }
+
+        inline bool send (message_t &msg_, int flags_ = 0)
+        {
+            int nbytes = zmq_msg_send (&(msg_.msg), ptr, flags_);
+            if (nbytes >= 0)
+                return true;
+            if (zmq_errno () == EAGAIN)
+                return false;
+            throw error_t ();
+        }
+
+        inline size_t recv (void *buf_, size_t len_, int flags_ = 0)
+        {
+            int nbytes = zmq_recv (ptr, buf_, len_, flags_);
+            if (nbytes >= 0)
+                return (size_t) nbytes;
+            if (zmq_errno () == EAGAIN)
+                return 0;
+            throw error_t ();
+        }
+
+        inline bool recv (message_t *msg_, int flags_ = 0)
+        {
+            int nbytes = zmq_msg_recv (&(msg_->msg), ptr, flags_);
+            if (nbytes >= 0)
+                return true;
+            if (zmq_errno () == EAGAIN)
+                return false;
+            throw error_t ();
+        }
+        
+    private:
+        void *ptr;
+        void *ctxptr;
+
+        socket_t (const socket_t&) ZMQ_DELETED_FUNCTION;
+        void operator = (const socket_t&) ZMQ_DELETED_FUNCTION;
+    };
+
+    class monitor_t
+    {
+    public:
+        monitor_t() : socketPtr(NULL) {}
+        virtual ~monitor_t() {}
+
+        void monitor(socket_t &socket, const char *addr_, int events = ZMQ_EVENT_ALL)
+        {
+            int rc = zmq_socket_monitor(socket.ptr, addr_, events);
+            if (rc != 0)
+                throw error_t ();
+
+            socketPtr = socket.ptr;
+            void *s = zmq_socket (socket.ctxptr, ZMQ_PAIR);
+            assert (s);
+
+            rc = zmq_connect (s, addr_);
+            assert (rc == 0);
+            
+            on_monitor_started();
+            
+            while (true) {
+                zmq_msg_t eventMsg;
+                zmq_msg_init (&eventMsg);
+                rc = zmq_recvmsg (s, &eventMsg, 0);
+                if (rc == -1 && zmq_errno() == ETERM)
+                    break;
+                assert (rc != -1);
+                zmq_event_t* event = static_cast<zmq_event_t*>(zmq_msg_data (&eventMsg));
+                
+#ifdef ZMQ_NEW_MONITOR_EVENT_LAYOUT
+                zmq_msg_t addrMsg;
+                zmq_msg_init (&addrMsg);
+                rc = zmq_recvmsg (s, &addrMsg, 0);
+                if (rc == -1 && zmq_errno() == ETERM)
+                    break;
+                assert (rc != -1);
+                const char* str = static_cast<const char*>(zmq_msg_data (&addrMsg));
+                std::string address(str, str + zmq_msg_size(&addrMsg));
+                zmq_msg_close (&addrMsg);
+#else
+                // Bit of a hack, but all events in the zmq_event_t union have the same layout so this will work for all event types.
+                std::string address = event->data.connected.addr;
+#endif
+
+#ifdef ZMQ_EVENT_MONITOR_STOPPED
+                if (event->event == ZMQ_EVENT_MONITOR_STOPPED)
+                    break;
+#endif
+
+                switch (event->event) {
+                case ZMQ_EVENT_CONNECTED:
+                    on_event_connected(*event, address.c_str());
+                    break;
+                case ZMQ_EVENT_CONNECT_DELAYED:
+                    on_event_connect_delayed(*event, address.c_str());
+                    break;
+                case ZMQ_EVENT_CONNECT_RETRIED:
+                    on_event_connect_retried(*event, address.c_str());
+                    break;
+                case ZMQ_EVENT_LISTENING:
+                    on_event_listening(*event, address.c_str());
+                    break;
+                case ZMQ_EVENT_BIND_FAILED:
+                    on_event_bind_failed(*event, address.c_str());
+                    break;
+                case ZMQ_EVENT_ACCEPTED:
+                    on_event_accepted(*event, address.c_str());
+                    break;
+                case ZMQ_EVENT_ACCEPT_FAILED:
+                    on_event_accept_failed(*event, address.c_str());
+                    break;
+                case ZMQ_EVENT_CLOSED:
+                    on_event_closed(*event, address.c_str());
+                    break;
+                case ZMQ_EVENT_CLOSE_FAILED:
+                    on_event_close_failed(*event, address.c_str());
+                    break;
+                case ZMQ_EVENT_DISCONNECTED:
+                    on_event_disconnected(*event, address.c_str());
+                    break;
+                default:
+                    on_event_unknown(*event, address.c_str());
+                    break;
+                }
+                zmq_msg_close (&eventMsg);
+            }
+            zmq_close (s);
+            socketPtr = NULL;
+        }
+
+#ifdef ZMQ_EVENT_MONITOR_STOPPED
+        void abort()
+        {
+            if (socketPtr)
+                zmq_socket_monitor(socketPtr, NULL, 0);
+        }
+#endif
+        virtual void on_monitor_started() {}
+        virtual void on_event_connected(const zmq_event_t &event_, const char* addr_) { (void)event_; (void)addr_; }
+        virtual void on_event_connect_delayed(const zmq_event_t &event_, const char* addr_) { (void)event_; (void)addr_; }
+        virtual void on_event_connect_retried(const zmq_event_t &event_, const char* addr_) { (void)event_; (void)addr_; }
+        virtual void on_event_listening(const zmq_event_t &event_, const char* addr_) { (void)event_; (void)addr_; }
+        virtual void on_event_bind_failed(const zmq_event_t &event_, const char* addr_) { (void)event_; (void)addr_; }
+        virtual void on_event_accepted(const zmq_event_t &event_, const char* addr_) { (void)event_; (void)addr_; }
+        virtual void on_event_accept_failed(const zmq_event_t &event_, const char* addr_) { (void)event_; (void)addr_; }
+        virtual void on_event_closed(const zmq_event_t &event_, const char* addr_) { (void)event_; (void)addr_; }
+        virtual void on_event_close_failed(const zmq_event_t &event_, const char* addr_) { (void)event_; (void)addr_; }
+        virtual void on_event_disconnected(const zmq_event_t &event_, const char* addr_) { (void)event_; (void)addr_; }
+        virtual void on_event_unknown(const zmq_event_t &event_, const char* addr_) { (void)event_; (void)addr_; }
+    private:
+        void* socketPtr;
+    };
+}
+
+#endif

ZeroMQ persistent buffer V.1