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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.
*
*/
// FIXME aconway 2008-04-24: Reminders for handler implementation.
//
// - execution.sync results must be communicated to SessionState::peerConfirmed.
//
//
#include "SessionState.h"
#include "qpid/amqp_0_10/exceptions.h"
#include "qpid/framing/AMQMethodBody.h"
#include <boost/bind.hpp>
#include <numeric>
namespace qpid {
using framing::AMQFrame;
using amqp_0_10::NotImplementedException;
/** A point in the session - command id + offset */
void SessionPoint::advance(const AMQFrame& f) {
if (f.isLastSegment() && f.isLastFrame()) {
++command;
offset = 0;
}
else {
// TODO aconway 2008-04-24: if we go to support for partial
// command replay, then it may be better to record the unframed
// data size in a command point rather than the framed size so
// that the relationship of fragment offsets to the replay
// list can be computed more easily.
//
offset += f.size();
}
}
bool SessionPoint::operator<(const SessionPoint& x) const {
return command < x.command || (command == x.command && offset < x.offset);
}
bool SessionPoint::operator==(const SessionPoint& x) const {
return command == x.command && offset == x.offset;
}
SendState::SendState(size_t syncSize, size_t killSize)
: replaySyncSize(syncSize), replayKillSize(killSize), unflushedSize() {}
void SendState::send(const AMQFrame& f) {
if (f.getMethod() && f.getMethod()->type() == 0)
return; // Don't replay control frames.
replayList.push_back(f);
unflushedSize += f.size();
sendPoint.advance(f);
}
bool SendState::needFlush() const { return unflushedSize >= replaySyncSize; }
void SendState::sendFlush() {
assert(flushPoint <= sendPoint);
flushPoint = sendPoint;
unflushedSize = 0;
}
void SendState::peerConfirmed(const SessionPoint& confirmed) {
ReplayList::iterator i = replayList.begin();
// Ignore peerConfirmed.offset, we don't support partial replay.
while (i != replayList.end() && replayPoint.command < confirmed.command) {
assert(replayPoint <= flushPoint);
replayPoint.advance(*i);
assert(replayPoint <= sendPoint);
if (replayPoint > flushPoint) {
flushPoint.advance(*i);
assert(replayPoint <= flushPoint);
unflushedSize -= i->size();
}
++i;
}
replayList.erase(replayList.begin(), i);
assert(replayPoint.offset == 0);
}
void SendState::peerCompleted(const SequenceSet& commands) {
if (commands.empty()) return;
sentCompleted += commands;
// Completion implies confirmation but we don't handle out-of-order
// confirmation, so confirm only the first contiguous range of commands.
peerConfirmed(SessionPoint(commands.rangesBegin()->end()));
}
bool ReceiveState::hasState() { return stateful; }
void ReceiveState::setExpecting(const SessionPoint& point) {
if (!hasState()) // initializing a new session.
expecting = received = point;
else { // setting point in an existing session.
if (point > received)
throw NotImplementedException("command-point out of bounds.");
expecting = point;
}
}
ReceiveState::ReceiveState() : stateful() {}
bool ReceiveState::receive(const AMQFrame& f) {
stateful = true;
expecting.advance(f);
if (expecting > received) {
received = expecting;
return true;
}
return false;
}
void ReceiveState::localCompleted(SequenceNumber command) {
assert(command < received.command); // Can't complete what we haven't received.
receivedCompleted += command;
}
void ReceiveState::peerKnownComplete(const SequenceSet& commands) {
receivedCompleted -= commands;
}
SessionId::SessionId(const std::string& u, const std::string& n) : userId(u), name(n) {}
bool SessionId::operator<(const SessionId& id) const {
return userId < id.userId || (userId == id.userId && name < id.name);
}
bool SessionId::operator==(const SessionId& id) const {
return id.name == name && id.userId == userId;
}
SessionState::Configuration::Configuration()
: replaySyncSize(std::numeric_limits<size_t>::max()),
replayKillSize(std::numeric_limits<size_t>::max()) {}
SessionState::SessionState(const SessionId& i, const Configuration& c)
: SendState(c.replaySyncSize, c.replayKillSize),
id(i), timeout(), config(c) {}
void SessionState::clear() { *this = SessionState(id, config); }
std::ostream& operator<<(std::ostream& o, const SessionPoint& p) {
return o << "(" << p.command.getValue() << "+" << p.offset << ")";
}
} // namespace qpid
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