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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 ownersip. 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/broker/PriorityQueue.h"
#include "qpid/broker/Queue.h"
#include "qpid/broker/QueuedMessage.h"
#include "qpid/framing/reply_exceptions.h"
#include "qpid/log/Statement.h"
#include <cmath>
namespace qpid {
namespace broker {
PriorityQueue::PriorityQueue(int l) :
levels(l),
messages(levels, Deque()),
frontLevel(0), haveFront(false), cached(false) {}
bool PriorityQueue::deleted(const QueuedMessage& qm) {
bool deleted = fifo.deleted(qm);
if (deleted) erase(qm);
return deleted;
}
size_t PriorityQueue::size()
{
return fifo.size();
}
namespace {
bool before(QueuedMessage* a, QueuedMessage* b) { return *a < *b; }
}
void PriorityQueue::release(const QueuedMessage& message)
{
QueuedMessage* qm = fifo.releasePtr(message);
if (qm) {
uint p = getPriorityLevel(message);
messages[p].insert(
lower_bound(messages[p].begin(), messages[p].end(), qm, before), qm);
clearCache();
}
}
void PriorityQueue::erase(const QueuedMessage& qm) {
size_t i = getPriorityLevel(qm);
if (!messages[i].empty()) {
long diff = qm.position.getValue() - messages[i].front()->position.getValue();
if (diff < 0) return;
long maxEnd = std::min(size_t(diff), messages[i].size());
QueuedMessage mutableQm = qm; // need non-const qm for lower_bound
Deque::iterator l =
lower_bound(messages[i].begin(),messages[i].begin()+maxEnd, &mutableQm, before);
if (l != messages[i].end() && (*l)->position == qm.position) {
messages[i].erase(l);
clearCache();
return;
}
}
}
bool PriorityQueue::acquire(const framing::SequenceNumber& position, QueuedMessage& message)
{
bool acquired = fifo.acquire(position, message);
if (acquired) erase(message); // No longer available
return acquired;
}
bool PriorityQueue::find(const framing::SequenceNumber& position, QueuedMessage& message)
{
return fifo.find(position, message);
}
bool PriorityQueue::browse(
const framing::SequenceNumber& position, QueuedMessage& message, bool unacquired)
{
return fifo.browse(position, message, unacquired);
}
bool PriorityQueue::consume(QueuedMessage& message)
{
if (checkFront()) {
QueuedMessage* pm = messages[frontLevel].front();
messages[frontLevel].pop_front();
clearCache();
pm->status = QueuedMessage::ACQUIRED; // Updates FIFO index
message = *pm;
return true;
} else {
return false;
}
}
bool PriorityQueue::push(const QueuedMessage& added, QueuedMessage& /*not needed*/)
{
QueuedMessage* qmp = fifo.pushPtr(added);
messages[getPriorityLevel(added)].push_back(qmp);
clearCache();
return false; // Adding a message never causes one to be removed for deque
}
void PriorityQueue::updateAcquired(const QueuedMessage& acquired) {
fifo.updateAcquired(acquired);
}
void PriorityQueue::foreach(Functor f)
{
fifo.foreach(f);
}
void PriorityQueue::removeIf(Predicate p)
{
for (int priority = 0; priority < levels; ++priority) {
for (Deque::iterator i = messages[priority].begin(); i != messages[priority].end();) {
if (p(**i)) {
(*i)->status = QueuedMessage::DELETED; // Updates fifo index
i = messages[priority].erase(i);
clearCache();
} else {
++i;
}
}
}
fifo.clean();
}
uint PriorityQueue::getPriorityLevel(const QueuedMessage& m) const
{
uint priority = m.payload->getPriority();
//Use AMQP 0-10 approach to mapping priorities to a fixed level
//(see rule priority-level-implementation)
const uint firstLevel = 5 - uint(std::min(5.0, std::ceil((double) levels/2.0)));
if (priority <= firstLevel) return 0;
return std::min(priority - firstLevel, (uint)levels-1);
}
void PriorityQueue::clearCache()
{
cached = false;
}
bool PriorityQueue::findFrontLevel(uint& l, PriorityLevels& m)
{
for (int p = levels-1; p >= 0; --p) {
if (!m[p].empty()) {
l = p;
return true;
}
}
return false;
}
bool PriorityQueue::checkFront()
{
if (!cached) {
haveFront = findFrontLevel(frontLevel, messages);
cached = true;
}
return haveFront;
}
uint PriorityQueue::getPriority(const QueuedMessage& message)
{
const PriorityQueue* queue = dynamic_cast<const PriorityQueue*>(&(message.queue->getMessages()));
if (queue) return queue->getPriorityLevel(message);
else return 0;
}
}} // namespace qpid::broker
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