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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 "IncomingExecutionContext.h"
#include "qpid/Exception.h"
namespace qpid {
namespace broker {
using boost::intrusive_ptr;
using qpid::framing::AccumulatedAck;
using qpid::framing::SequenceNumber;
using qpid::framing::SequenceNumberSet;
void IncomingExecutionContext::noop()
{
complete(next());
}
void IncomingExecutionContext::flush()
{
for (Messages::iterator i = incomplete.begin(); i != incomplete.end(); ) {
if ((*i)->isEnqueueComplete()) {
complete((*i)->getCommandId());
i = incomplete.erase(i);
} else {
i++;
}
}
window.lwm = completed.mark;
}
void IncomingExecutionContext::sync()
{
while (completed.mark < window.hwm) {
wait();
}
}
void IncomingExecutionContext::sync(const SequenceNumber& point)
{
while (!isComplete(point)) {
wait();
}
}
/**
* Every call to next() should be followed be either a call to
* complete() - in the case of commands, which are always synchronous
* - or track() - in the case of messages which may be asynchronously
* stored.
*/
SequenceNumber IncomingExecutionContext::next()
{
return ++window.hwm;
}
void IncomingExecutionContext::complete(const SequenceNumber& command)
{
completed.update(command, command);
}
void IncomingExecutionContext::track(intrusive_ptr<Message> msg)
{
if (msg->isEnqueueComplete()) {
complete(msg->getCommandId());
} else {
incomplete.push_back(msg);
}
}
bool IncomingExecutionContext::isComplete(const SequenceNumber& command)
{
if (command > window.hwm) {
throw Exception(QPID_MSG("Bad sync request: point exceeds last command received ["
<< command.getValue() << " > " << window.hwm.getValue() << "]"));
}
return completed.covers(command);
}
const SequenceNumber& IncomingExecutionContext::getMark()
{
return completed.mark;
}
SequenceNumberSet IncomingExecutionContext::getRange()
{
SequenceNumberSet range;
completed.collectRanges(range);
return range;
}
void IncomingExecutionContext::wait()
{
check();
// for IO flush on the store
for (Messages::iterator i = incomplete.begin(); i != incomplete.end(); i++) {
(*i)->flush();
}
incomplete.front()->waitForEnqueueComplete();
flush();
}
/**
* This is a check of internal state consistency.
*/
void IncomingExecutionContext::check()
{
if (incomplete.empty()) {
if (window.hwm != completed.mark) {
//can only happen if there is a call to next() without a
//corresponding call to completed() or track() - or if
//there is a logical error in flush() or
//AccumulatedAck::update()
throw Exception(QPID_MSG("Completion tracking error: window.hwm="
<< window.hwm.getValue() << ", completed.mark="
<< completed.mark.getValue()));
}
}
}
}}
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