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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/amqp_0_10/Connection.h"
#include "qpid/log/Statement.h"
#include "qpid/amqp_0_10/exceptions.h"
#include "qpid/framing/AMQFrame.h"
#include "qpid/framing/Buffer.h"
#include "qpid/framing/ProtocolInitiation.h"
namespace qpid {
namespace amqp_0_10 {
using sys::Mutex;
Connection::Connection(sys::OutputControl& o, const std::string& id, bool _isClient)
: pushClosed(false), popClosed(false), output(o), identifier(id), initialized(false),
isClient(_isClient), buffered(0), version(0,10)
{}
void Connection::setInputHandler(std::auto_ptr<sys::ConnectionInputHandler> c) {
connection = c;
}
size_t Connection::decode(const char* buffer, size_t size) {
framing::Buffer in(const_cast<char*>(buffer), size);
if (isClient && !initialized) {
//read in protocol header
framing::ProtocolInitiation pi;
if (pi.decode(in)) {
if(!(pi==version))
throw Exception(QPID_MSG("Unsupported version: " << pi
<< " supported version " << version));
QPID_LOG(trace, "RECV [" << identifier << "]: INIT(" << pi << ")");
}
initialized = true;
}
framing::AMQFrame frame;
while(frame.decode(in)) {
QPID_LOG(trace, "RECV [" << identifier << "]: " << frame);
connection->received(frame);
}
return in.getPosition();
}
bool Connection::canEncode() {
Mutex::ScopedLock l(frameQueueLock);
if (!popClosed) {
Mutex::ScopedUnlock u(frameQueueLock);
connection->doOutput();
}
return !popClosed && ((!isClient && !initialized) || !frameQueue.empty());
}
bool Connection::isClosed() const {
Mutex::ScopedLock l(frameQueueLock);
return pushClosed && popClosed;
}
size_t Connection::encode(const char* buffer, size_t size) {
{ // Swap frameQueue data into workQueue to avoid holding lock while we encode.
Mutex::ScopedLock l(frameQueueLock);
if (popClosed) return 0; // Can't pop any more frames.
assert(workQueue.empty());
workQueue.swap(frameQueue);
}
framing::Buffer out(const_cast<char*>(buffer), size);
if (!isClient && !initialized) {
framing::ProtocolInitiation pi(getVersion());
pi.encode(out);
initialized = true;
QPID_LOG(trace, "SENT [" << identifier << "]: INIT(" << pi << ")");
}
size_t frameSize=0;
size_t encoded=0;
while (!workQueue.empty() && ((frameSize=workQueue.front().encodedSize()) <= out.available())) {
workQueue.front().encode(out);
QPID_LOG(trace, "SENT [" << identifier << "]: " << workQueue.front());
workQueue.pop_front();
encoded += frameSize;
if (workQueue.empty() && out.available() > 0) {
// try to get more output
connection->doOutput();
Mutex::ScopedLock l(frameQueueLock);
workQueue.swap(frameQueue); // Need to get any new frames into the work queue
}
}
assert(workQueue.empty() || workQueue.front().encodedSize() <= size);
if (!workQueue.empty() && workQueue.front().encodedSize() > size)
throw InternalErrorException(QPID_MSG("Frame too large for buffer."));
{
Mutex::ScopedLock l(frameQueueLock);
buffered -= encoded;
// Put back any frames we did not encode.
frameQueue.insert(frameQueue.begin(), workQueue.begin(), workQueue.end());
workQueue.clear();
if (frameQueue.empty() && pushClosed)
popClosed = true;
}
return out.getPosition();
}
void Connection::abort() { output.abort(); }
void Connection::activateOutput() { output.activateOutput(); }
void Connection::giveReadCredit(int32_t credit) { output.giveReadCredit(credit); }
void Connection::close() {
// No more frames can be pushed onto the queue.
// Frames aleady on the queue can be popped.
Mutex::ScopedLock l(frameQueueLock);
pushClosed = true;
}
void Connection::closed() {
connection->closed();
}
void Connection::send(framing::AMQFrame& f) {
{
Mutex::ScopedLock l(frameQueueLock);
if (!pushClosed)
frameQueue.push_back(f);
buffered += f.encodedSize();
}
activateOutput();
}
framing::ProtocolVersion Connection::getVersion() const {
return version;
}
void Connection::setVersion(const framing::ProtocolVersion& v) {
version = v;
}
size_t Connection::getBuffered() const {
Mutex::ScopedLock l(frameQueueLock);
return buffered;
}
}} // namespace qpid::amqp_0_10
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