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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 "OutputInterceptor.h"
#include "Connection.h"
#include "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;
NoOpConnectionOutputHandler OutputInterceptor::discardHandler;
OutputInterceptor::OutputInterceptor(Connection& p, sys::ConnectionOutputHandler& h)
: parent(p), closing(false), next(&h), sent(),
writeEstimate(p.getCluster().getWriteEstimate()),
moreOutput(), doingOutput()
{}
void OutputInterceptor::send(framing::AMQFrame& f) {
parent.getCluster().checkQuorum();
{
sys::Mutex::ScopedLock l(lock);
next->send(f);
}
if (!parent.isCatchUp())
sent += f.encodedSize();
}
void OutputInterceptor::activateOutput() {
if (parent.isCatchUp()) {
sys::Mutex::ScopedLock l(lock);
next->activateOutput();
}
else if (!closing) { // Don't send do ouput after output stopped.
QPID_LOG(trace, parent << " activateOutput - sending doOutput");
moreOutput = true;
sendDoOutput();
}
}
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 do nothing in the write thread, we run doOutput only on delivery
// of doOutput requests.
bool OutputInterceptor::doOutput() { return false; }
// Delivery of doOutput allows us to run the real connection doOutput()
// which tranfers frames to the codec for writing.
//
void OutputInterceptor::deliverDoOutput(size_t requested) {
size_t buf = getBuffered();
if (parent.isLocal())
writeEstimate.delivered(requested, sent, buf); // Update the estimate.
// Run the real doOutput() till we have added the requested data or there's nothing to output.
sent = 0;
do {
moreOutput = parent.getBrokerConnection().doOutput();
} while (sent < requested && moreOutput);
sent += buf; // Include buffered data in the sent total.
QPID_LOG(trace, parent << " delivereDoOutput: requested=" << requested << " sent=" << sent << " more=" << moreOutput);
if (parent.isLocal() && moreOutput) {
QPID_LOG(trace, parent << " deliverDoOutput - sending doOutput, more output available.");
sendDoOutput();
}
else
doingOutput = false;
}
// Send a doOutput request if one is not already in flight.
void OutputInterceptor::sendDoOutput() {
if (!parent.isLocal()) return;
doingOutput = true;
size_t request = writeEstimate.sending(getBuffered());
// Note we may send 0 size request if there's more than 2*estimate in the buffer.
// Send it anyway to keep the doOutput chain going until we are sure there's no more output
// (in deliverDoOutput)
//
parent.getCluster().getMulticast().mcastControl(
ClusterConnectionDeliverDoOutputBody(ProtocolVersion(), request), parent.getId());
QPID_LOG(trace, parent << "Send doOutput request for " << request);
}
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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