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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#include "qpid/cluster/Multicaster.h"
#include "qpid/cluster/Cpg.h"
#include "qpid/log/Statement.h"
#include "qpid/framing/AMQBody.h"
#include "qpid/framing/AMQFrame.h"
#include <boost/bind.hpp>
#include <algorithm>
namespace qpid {
namespace cluster {
static const int MCAST_IOV_MAX=63; // Limit imposed by CPG
Multicaster::Multicaster(Cpg& cpg_,
const boost::shared_ptr<sys::Poller>& poller,
boost::function<void()> onError_) :
#if defined (QPID_LATENCY_TRACKER)
cpgLatency("CPG"),
#endif
onError(onError_), cpg(cpg_),
queue(boost::bind(&Multicaster::sendMcast, this, _1), poller),
holding(true),
ioVector(MCAST_IOV_MAX)
{
queue.start();
}
void Multicaster::mcastControl(const framing::AMQBody& body, const ConnectionId& id) {
QPID_LOG(trace, "MCAST " << id << ": " << body);
mcast(Event::control(body, id));
}
void Multicaster::mcastControl(const framing::AMQFrame& frame, const ConnectionId& id) {
QPID_LOG(trace, "MCAST " << id << ": " << frame);
mcast(Event::control(frame, id));
}
void Multicaster::mcastBuffer(const char* data, size_t size, const ConnectionId& id) {
Event e(DATA, id, size);
memcpy(e.getData(), data, size);
QPID_LOG(trace, "MCAST " << e);
mcast(e);
}
void Multicaster::mcast(const Event& e) {
{
sys::Mutex::ScopedLock l(lock);
LATENCY_TRACK(cpgLatency.start());
if (e.isConnection() && holding) {
holdingQueue.push_back(e);
return;
}
}
queue.push(e);
}
Multicaster::PollableEventQueue::Batch::const_iterator Multicaster::sendMcast(
const PollableEventQueue::Batch& events)
{
PollableEventQueue::Batch::const_iterator i = events.begin();
try {
while (i < events.end()) {
size_t count = std::min(MCAST_IOV_MAX, int(events.end() - i));
std::transform(i, i+count, ioVector.begin(),
boost::bind(&Event::toIovec, _1));
if (!cpg.mcast(&ioVector.front(), count)) {
QPID_LOG(trace, "CPG flow control, will resend "
<< events.end() - i << " events");
break;
}
i += count;
}
}
catch (const std::exception& e) {
QPID_LOG(critical, "Multicast error: " << e.what());
queue.stop();
onError();
}
return i;
}
void Multicaster::release() {
sys::Mutex::ScopedLock l(lock);
holding = false;
std::for_each(holdingQueue.begin(), holdingQueue.end(), boost::bind(&Multicaster::mcast, this, _1));
holdingQueue.clear();
}
}} // namespace qpid::cluster
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