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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 "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;
OutputInterceptor::OutputInterceptor(cluster::Connection& p, sys::ConnectionOutputHandler& h)
: parent(p), next(h), sent(), moreOutput(), doingOutput()
{}
void OutputInterceptor::send(framing::AMQFrame& f) {
Locker l(lock);
next.send(f);
sent += f.size();
}
void OutputInterceptor::activateOutput() {
Locker l(lock);
moreOutput = true;
sendDoOutput();
}
// 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 stocks up the write buffers with data.
//
void OutputInterceptor::deliverDoOutput(size_t requested) {
Locker l(lock);
size_t buf = next.getBuffered();
if (parent.isLocal())
writeEstimate.delivered(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 {
sys::Mutex::ScopedUnlock u(lock);
moreOutput = parent.getBrokerConnection().doOutput();
} while (sent < requested && moreOutput);
sent += buf; // Include buffered data in the sent total.
QPID_LOG(trace, "Delivered doOutput: requested=" << requested << " output=" << sent << " more=" << moreOutput);
if (parent.isLocal() && moreOutput)
sendDoOutput();
else
doingOutput = false;
}
void OutputInterceptor::startDoOutput() {
if (!doingOutput)
sendDoOutput();
}
// Send a doOutput request if one is not already in flight.
void OutputInterceptor::sendDoOutput() {
// Call with lock held.
// FIXME aconway 2008-08-28: used to have || parent.getClosed())
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().send(AMQFrame(in_place<ClusterConnectionDeliverDoOutputBody>(
framing::ProtocolVersion(), request)), parent.getId());
QPID_LOG(trace, &parent << "Send doOutput request for " << request);
}
}} // namespace qpid::cluster
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