Imported Upstream version 2.0.7.dfsgupstream/2.0.7.dfsg

1 files changed, 195 insertions, 0 deletions

diff --git a/src/zmq_engine.cpp b/src/zmq_engine.cpp
new file mode 100644
index 0000000..41b10c8
--- /dev/null
+++ b/src/zmq_engine.cpp
@@ -0,0 +1,195 @@
+/*
+    Copyright (c) 2007-2010 iMatix Corporation
+
+    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/>.
+*/
+
+#include "platform.hpp"
+#if defined ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#endif
+
+#include <string.h>
+#include <new>
+
+#include "zmq_engine.hpp"
+#include "zmq_connecter.hpp"
+#include "io_thread.hpp"
+#include "i_inout.hpp"
+#include "config.hpp"
+#include "err.hpp"
+
+zmq::zmq_engine_t::zmq_engine_t (io_thread_t *parent_, fd_t fd_,
+      const options_t &options_, bool reconnect_, 
+      const char *protocol_, const char *address_) :
+    io_object_t (parent_),
+    inpos (NULL),
+    insize (0),
+    decoder (in_batch_size),
+    outpos (NULL),
+    outsize (0),
+    encoder (out_batch_size),
+    inout (NULL),
+    options (options_),
+    reconnect (reconnect_)
+{
+    if (reconnect) {
+        protocol = protocol_;
+        address = address_;
+    }
+
+    //  Initialise the underlying socket.
+    int rc = tcp_socket.open (fd_, options.sndbuf, options.rcvbuf);
+    zmq_assert (rc == 0);
+}
+
+zmq::zmq_engine_t::~zmq_engine_t ()
+{
+}
+
+void zmq::zmq_engine_t::plug (i_inout *inout_)
+{
+    zmq_assert (!inout);
+
+    encoder.set_inout (inout_);
+    decoder.set_inout (inout_);
+
+    handle = add_fd (tcp_socket.get_fd ());
+    set_pollin (handle);
+    set_pollout (handle);
+
+    inout = inout_;
+
+    //  Flush all the data that may have been already received downstream.
+    in_event ();
+}
+
+void zmq::zmq_engine_t::unplug ()
+{
+    rm_fd (handle);
+    encoder.set_inout (NULL);
+    decoder.set_inout (NULL);
+    inout = NULL;
+}
+
+void zmq::zmq_engine_t::in_event ()
+{
+    bool disconnection = false;
+
+    //  If there's no data to process in the buffer...
+    if (!insize) {
+
+        //  Retrieve the buffer and read as much data as possible.
+        decoder.get_buffer (&inpos, &insize);
+        insize = tcp_socket.read (inpos, insize);
+
+        //  Check whether the peer has closed the connection.
+        if (insize == (size_t) -1) {
+            insize = 0;
+            disconnection = true;
+        }
+    }
+
+    //  Push the data to the decoder.
+    size_t processed = decoder.process_buffer (inpos, insize);
+
+    //  Stop polling for input if we got stuck.
+    if (processed < insize) {
+
+        //  This may happen if queue limits are in effect or when
+        //  init object reads all required information from the socket
+        //  and rejects to read more data.
+        reset_pollin (handle);
+    }
+
+    //  Adjust the buffer.
+    inpos += processed;
+    insize -= processed;
+
+    //  Flush all messages the decoder may have produced.
+    inout->flush ();
+
+    if (disconnection)
+        error ();
+}
+
+void zmq::zmq_engine_t::out_event ()
+{
+    //  If write buffer is empty, try to read new data from the encoder.
+    if (!outsize) {
+
+        outpos = NULL;
+        encoder.get_data (&outpos, &outsize);
+        
+        //  If there is no data to send, stop polling for output.
+        if (outsize == 0) {
+            reset_pollout (handle);
+            return;
+        }
+    }
+
+    //  If there are any data to write in write buffer, write as much as
+    //  possible to the socket.
+    int nbytes = tcp_socket.write (outpos, outsize);
+
+    //  Handle problems with the connection.
+    if (nbytes == -1) {
+        error ();
+        return;
+    }
+
+    outpos += nbytes;
+    outsize -= nbytes;
+}
+
+void zmq::zmq_engine_t::revive ()
+{
+    set_pollout (handle);
+
+    //  Speculative write: The assumption is that at the moment new message
+    //  was sent by the user the socket is probably available for writing.
+    //  Thus we try to write the data to socket avoiding polling for POLLOUT.
+    //  Consequently, the latency should be better in request/reply scenarios.
+    out_event ();
+}
+
+void zmq::zmq_engine_t::resume_input ()
+{
+    set_pollin (handle);
+
+    in_event ();
+}
+
+void zmq::zmq_engine_t::error ()
+{
+    zmq_assert (inout);
+
+    zmq_connecter_t *reconnecter = NULL;
+    if (reconnect) {
+
+        //  Create a connecter object to attempt reconnect.
+        //  Ask it to wait for a while before reconnecting.
+        reconnecter = new (std::nothrow) zmq_connecter_t (
+            inout->get_io_thread (), inout->get_owner (),
+            options, inout->get_ordinal (), true);
+        zmq_assert (reconnecter);
+        reconnecter->set_address (protocol.c_str(), address.c_str ());
+    }
+
+    inout->detach (reconnecter);
+    unplug ();
+    delete this;
+}