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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 "LossyQueue.h"
#include "QueueDepth.h"
#include "qpid/framing/reply_exceptions.h"
#include "qpid/log/Statement.h"
namespace qpid {
namespace broker {
namespace {
bool isLowerPriorityThan(uint8_t priority, const Message& m)
{
return m.getPriority() <= priority;
}
}
LossyQueue::LossyQueue(const std::string& n, const QueueSettings& s, MessageStore* const ms, management::Manageable* p, Broker* b)
: Queue(n, s, ms, p, b) {}
bool LossyQueue::checkDepth(const QueueDepth& increment, const Message& message)
{
if (increment.getSize() > settings.maxDepth.getSize()) {
if (mgmtObject) {
mgmtObject->inc_discardsOverflow();
if (brokerMgmtObject)
brokerMgmtObject->inc_discardsOverflow();
}
throw qpid::framing::ResourceLimitExceededException(QPID_MSG("Message larger than configured maximum depth on "
<< name << ": size=" << increment.getSize() << ", max-size=" << settings.maxDepth.getSize()));
}
while (settings.maxDepth && (current + increment > settings.maxDepth)) {
QPID_LOG(debug, "purging " << name << ": current depth is [" << current << "], max depth is [" << settings.maxDepth << "], new message has size " << increment.getSize());
qpid::sys::Mutex::ScopedUnlock u(messageLock);
//TODO: arguably we should try and purge expired messages first but that is potentially expensive
if (remove(1, settings.priorities ? boost::bind(&isLowerPriorityThan, message.getPriority(), _1) : MessagePredicate(), MessageFunctor(), PURGE)) {
if (mgmtObject) {
mgmtObject->inc_discardsRing(1);
if (brokerMgmtObject)
brokerMgmtObject->inc_discardsRing(1);
}
} else {
//should only be the case for a non-empty queue if we are
//testing priority and there was no lower (or equal)
//priority message available to purge
break;
}
}
if (settings.maxDepth && (current + increment > settings.maxDepth)) {
//will only be the case where we were unable to purge another
//message, which should only be the case if we are purging
//based on priority and there was no message with a lower (or
//equal) priority than this one, meaning that we drop this
//current message
if (mgmtObject) {
mgmtObject->inc_discardsRing(1);
if (brokerMgmtObject)
brokerMgmtObject->inc_discardsRing(1);
}
return false;
} else {
//have sufficient space for this message
current += increment;
return true;
}
}
}} // namespace qpid::broker
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