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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/OutputInterceptor.h"
#include "qpid/cluster/Connection.h"
#include "qpid/cluster/Cluster.h"
#include "qpid/framing/ClusterConnectionDeliverDoOutputBody.h"
#include "qpid/framing/AMQFrame.h"
#include "qpid/log/Statement.h"
#include <boost/current_function.hpp>
namespace qpid {
namespace cluster {
using namespace framing;
using namespace std;
NoOpConnectionOutputHandler OutputInterceptor::discardHandler;
OutputInterceptor::OutputInterceptor(Connection& p, sys::ConnectionOutputHandler& h)
: parent(p), closing(false), next(&h), sendMax(2048), sent(0), sentDoOutput(false)
{}
void OutputInterceptor::send(framing::AMQFrame& f) {
sys::Mutex::ScopedLock l(lock);
next->send(f);
}
void OutputInterceptor::activateOutput() {
sys::Mutex::ScopedLock l(lock);
if (parent.isCatchUp())
next->activateOutput();
else
sendDoOutput(sendMax, l);
}
void OutputInterceptor::abort() {
sys::Mutex::ScopedLock l(lock);
if (parent.isLocal()) {
next->abort();
}
}
void OutputInterceptor::giveReadCredit(int32_t credit) {
sys::Mutex::ScopedLock l(lock);
next->giveReadCredit(credit);
}
// Called in write thread when the IO layer has no more data to write.
// We only process IO callbacks in the write thread during catch-up.
// Normally we run doOutput only on delivery of doOutput requests.
bool OutputInterceptor::doOutput() {
parent.doCatchupIoCallbacks();
return false;
}
// Send output up to limit, calculate new limit.
void OutputInterceptor::deliverDoOutput(uint32_t limit) {
sys::Mutex::ScopedLock l(lock);
sentDoOutput = false;
sendMax = limit;
size_t newLimit = limit;
if (parent.isLocal()) {
size_t buffered = next->getBuffered();
if (buffered == 0 && sent == sendMax) // Could have sent more, increase the limit.
newLimit = sendMax*2;
else if (buffered > 0 && sent > 1) // Data left unsent, reduce the limit.
newLimit = (sendMax + sent) / 2;
}
sent = 0;
while (sent < limit) {
{
sys::Mutex::ScopedUnlock u(lock);
if (!parent.getBrokerConnection()->doOutput()) break;
}
++sent;
}
if (sent == limit) sendDoOutput(newLimit, l);
}
void OutputInterceptor::sendDoOutput(size_t newLimit, const sys::Mutex::ScopedLock&) {
if (parent.isLocal() && !sentDoOutput && !closing && parent.isAnnounced()) {
sentDoOutput = true;
parent.getCluster().getMulticast().mcastControl(
ClusterConnectionDeliverDoOutputBody(ProtocolVersion(), newLimit),
parent.getId());
}
}
// Called in connection thread when local connection closes.
void OutputInterceptor::closeOutput() {
sys::Mutex::ScopedLock l(lock);
closing = true;
next = &discardHandler;
}
void OutputInterceptor::close() {
sys::Mutex::ScopedLock l(lock);
next->close();
}
size_t OutputInterceptor::getBuffered() const {
sys::Mutex::ScopedLock l(lock);
return next->getBuffered();
}
}} // namespace qpid::cluster
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