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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 WARRANTIE4bS OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#include "SessionState.h"
#include "qpid/framing/reply_exceptions.h"
#include "qpid/framing/constants.h"
#include "qpid/framing/AMQMethodBody.h"
#include "qpid/log/Statement.h"
#include <algorithm>
#include <boost/bind.hpp>
#include <boost/none.hpp>
namespace qpid {
namespace framing {
SessionState::SessionState(uint32_t ack, bool enableReplay, const Uuid& uuid) :
state(ATTACHED),
id(uuid),
lastReceived(u_int32_t(-1)),
lastSent(u_int32_t(-1)),
ackInterval(ack),
sendAckAt(lastReceived+ackInterval),
solicitAckAt(lastSent+ackInterval),
ackSolicited(false),
resumable(enableReplay)
{}
SessionState::SessionState(const Uuid& uuid) :
state(ATTACHED),
id(uuid),
lastReceived(u_int32_t(-1)),
lastSent(u_int32_t(-1)),
ackInterval(0),
sendAckAt(0),
solicitAckAt(0),
ackSolicited(false),
resumable(false)
{
}
namespace {
bool isSessionCommand(const AMQFrame& f) {
return f.getMethod() && f.getMethod()->amqpClassId() == SESSION_CLASS_ID;
}
}
boost::optional<SequenceNumber> SessionState::received(const AMQFrame& f) {
if (isSessionCommand(f))
return boost::none;
if (state==RESUMING)
throw CommandInvalidException(
QPID_MSG("Invalid frame: Resuming session, expected session-ack"));
assert(state = ATTACHED);
++lastReceived;
if (ackInterval && lastReceived == sendAckAt)
return sendingAck();
else
return boost::none;
}
bool SessionState::sent(const AMQFrame& f) {
if (isSessionCommand(f))
return false;
if (resumable) {
sys::Mutex::ScopedLock l(unackedLock);
unackedOut.push_back(f);
}
++lastSent;
return ackInterval &&
(state!=RESUMING) &&
(lastSent == solicitAckAt) &&
sendingSolicit();
}
SessionState::Replay SessionState::replay() {
sys::Mutex::ScopedLock l(unackedLock);
Replay r(unackedOut.size());
std::copy(unackedOut.begin(), unackedOut.end(), r.begin());
return r;
}
void SessionState::receivedAck(SequenceNumber acked) {
if (state==RESUMING) state=ATTACHED;
assert(state==ATTACHED);
if (lastSent < acked)
throw InvalidArgumentException("Invalid sequence number in ack");
size_t keep = lastSent - acked;
if (keep < unackedOut.size()) {
sys::Mutex::ScopedLock l(unackedLock);
unackedOut.erase(unackedOut.begin(), unackedOut.end()-keep);
}
solicitAckAt = std::max(solicitAckAt, SequenceNumber(acked+ackInterval));
}
SequenceNumber SessionState::sendingAck() {
sendAckAt = lastReceived+ackInterval;
return lastReceived;
}
bool SessionState::sendingSolicit() {
assert(state == ATTACHED);
if (ackSolicited)
return false;
solicitAckAt = lastSent + ackInterval;
return ackInterval != 0;
}
SequenceNumber SessionState::resuming() {
if (!resumable)
throw InternalErrorException("Session is not resumable");
state = RESUMING;
return sendingAck();
}
void SessionState::suspend() {
state = SUSPENDED;
}
}} // namespace qpid::framing
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