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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 "Multicaster.h"
#include "qpid/cluster/Cpg.h"
#include "qpid/log/Statement.h"
namespace qpid {
namespace cluster {
namespace {
const size_t MAX_IOV = 60; // Limit imposed by CPG
struct ::iovec bufToIov(const BufferRef& buf) {
::iovec iov;
iov.iov_base = buf.begin();
iov.iov_len = buf.size();
return iov;
}
}
Multicaster::Multicaster(Cpg& cpg_,
const boost::shared_ptr<sys::Poller>& poller,
boost::function<void()> onError_) :
onError(onError_), cpg(cpg_),
queue(boost::bind(&Multicaster::sendMcast, this, _1), poller),
ioVector(MAX_IOV),
buffers(64*1024) // TODO aconway 2011-03-15: optimum size?
{
queue.start();
}
void Multicaster::mcast(const framing::AMQDataBlock& data) {
BufferRef bufRef = buffers.get(data.encodedSize());
framing::Buffer buf(bufRef.begin(), bufRef.size());
data.encode(buf);
queue.push(bufRef);
}
Multicaster::PollableEventQueue::Batch::const_iterator
Multicaster::sendMcast(const PollableEventQueue::Batch& buffers) {
try {
PollableEventQueue::Batch::const_iterator i = buffers.begin();
while( i != buffers.end()) {
size_t len = std::min(size_t(buffers.end() - i), MAX_IOV);
PollableEventQueue::Batch::const_iterator j = i + len;
std::transform(i, j, ioVector.begin(), &bufToIov);
if (!cpg.mcast(&ioVector[0], len)) {
// CPG didn't send because of CPG flow control.
return i;
}
i = j;
}
return i;
}
catch (const std::exception& e) {
QPID_LOG(critical, "Multicast error: " << e.what());
queue.stop();
onError();
return buffers.end();
}
}
}} // namespace qpid::cluster
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