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e0246e32d7
This patch addresses serveral issues: 1. It gathers message related functionality scattered over whole codebase into a single class. 2. It makes zmq_msg_t an opaque datatype. Internals of the class don't pollute zmq.h header file. 3. zmq_msg_t size decreases from 48 to 32 bytes. That saves ~33% of memory in scenarios with large amount of small messages. Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
95 lines
2.8 KiB
C++
95 lines
2.8 KiB
C++
/*
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Copyright (c) 2007-2011 iMatix Corporation
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Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
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This file is part of 0MQ.
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0MQ is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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0MQ is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "encoder.hpp"
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#include "i_inout.hpp"
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#include "wire.hpp"
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zmq::encoder_t::encoder_t (size_t bufsize_) :
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encoder_base_t <encoder_t> (bufsize_),
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source (NULL)
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{
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int rc = in_progress.init ();
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errno_assert (rc == 0);
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// Write 0 bytes to the batch and go to message_ready state.
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next_step (NULL, 0, &encoder_t::message_ready, true);
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}
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zmq::encoder_t::~encoder_t ()
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{
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int rc = in_progress.close ();
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errno_assert (rc == 0);
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}
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void zmq::encoder_t::set_inout (i_inout *source_)
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{
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source = source_;
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}
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bool zmq::encoder_t::size_ready ()
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{
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// Write message body into the buffer.
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next_step (in_progress.data (), in_progress.size (),
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&encoder_t::message_ready, false);
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return true;
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}
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bool zmq::encoder_t::message_ready ()
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{
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// Destroy content of the old message.
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int rc = in_progress.close ();
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errno_assert (rc == 0);
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// Read new message. If there is none, return false.
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// Note that new state is set only if write is successful. That way
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// unsuccessful write will cause retry on the next state machine
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// invocation.
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if (!source || !source->read (&in_progress)) {
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rc = in_progress.init ();
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errno_assert (rc == 0);
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return false;
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}
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// Get the message size.
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size_t size = in_progress.size ();
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// Account for the 'flags' byte.
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size++;
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// For messages less than 255 bytes long, write one byte of message size.
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// For longer messages write 0xff escape character followed by 8-byte
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// message size. In both cases 'flags' field follows.
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if (size < 255) {
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tmpbuf [0] = (unsigned char) size;
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tmpbuf [1] = (in_progress.flags () & ~msg_t::shared);
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next_step (tmpbuf, 2, &encoder_t::size_ready,
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!(in_progress.flags () & msg_t::more));
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}
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else {
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tmpbuf [0] = 0xff;
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put_uint64 (tmpbuf + 1, size);
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tmpbuf [9] = (in_progress.flags () & ~msg_t::shared);
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next_step (tmpbuf, 10, &encoder_t::size_ready,
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!(in_progress.flags () & msg_t::more));
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}
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return true;
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}
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