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/*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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 GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* NonBlockingSender.cpp
* Copyright (C) 2013 Simon Newton
*/
#include "ola/Callback.h"
#include "ola/io/IOQueue.h"
#include "ola/io/IOStack.h"
#include "ola/io/NonBlockingSender.h"
namespace ola {
namespace io {
const unsigned int NonBlockingSender::DEFAULT_MAX_BUFFER_SIZE = 1024;
NonBlockingSender::NonBlockingSender(ola::io::ConnectedDescriptor *descriptor,
ola::io::SelectServerInterface *ss,
ola::io::MemoryBlockPool *memory_pool,
unsigned int max_buffer_size)
: m_descriptor(descriptor),
m_ss(ss),
m_output_buffer(memory_pool),
m_associated(false),
m_max_buffer_size(max_buffer_size) {
m_descriptor->SetOnWritable(
ola::NewCallback(this, &NonBlockingSender::PerformWrite));
}
NonBlockingSender::~NonBlockingSender() {
if (m_associated) {
m_ss->RemoveWriteDescriptor(m_descriptor);
}
m_descriptor->SetOnWritable(NULL);
}
bool NonBlockingSender::LimitReached() const {
return m_output_buffer.Size() >= m_max_buffer_size;
}
bool NonBlockingSender::SendMessage(ola::io::IOStack *stack) {
if (LimitReached()) {
return false;
}
stack->MoveToIOQueue(&m_output_buffer);
AssociateIfRequired();
return true;
}
bool NonBlockingSender::SendMessage(IOQueue *queue) {
if (LimitReached()) {
return false;
}
m_output_buffer.AppendMove(queue);
AssociateIfRequired();
return true;
}
/*
* Called when the descriptor is writeable, this does the actual write() call.
*/
void NonBlockingSender::PerformWrite() {
m_descriptor->Send(&m_output_buffer);
if (m_output_buffer.Empty() && m_associated) {
m_ss->RemoveWriteDescriptor(m_descriptor);
m_associated = false;
}
}
/*
* Associate our descriptor with the SelectServer if we have data to send.
*/
void NonBlockingSender::AssociateIfRequired() {
if (m_output_buffer.Empty()) {
return;
}
m_ss->AddWriteDescriptor(m_descriptor);
m_associated = true;
}
} // namespace io
} // namespace ola
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