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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 "qpid/broker/Message.h"
#include "qpid/cluster/ExpiryPolicy.h"
#include "qpid/cluster/Multicaster.h"
#include "qpid/framing/ClusterMessageExpiredBody.h"
#include "qpid/sys/Time.h"
#include "qpid/sys/Timer.h"
#include "qpid/log/Statement.h"
namespace qpid {
namespace cluster {
ExpiryPolicy::ExpiryPolicy(Multicaster& m, const MemberId& id, sys::Timer& t)
: expiryId(1), expiredPolicy(new Expired), mcast(m), memberId(id), timer(t) {}
struct ExpiryTask : public sys::TimerTask {
ExpiryTask(const boost::intrusive_ptr<ExpiryPolicy>& policy, uint64_t id, sys::AbsTime when)
: TimerTask(when,"ExpiryPolicy"), expiryPolicy(policy), expiryId(id) {}
void fire() { expiryPolicy->sendExpire(expiryId); }
boost::intrusive_ptr<ExpiryPolicy> expiryPolicy;
const uint64_t expiryId;
};
// Called while receiving an update
void ExpiryPolicy::setId(uint64_t id) {
sys::Mutex::ScopedLock l(lock);
expiryId = id;
}
// Called while giving an update
uint64_t ExpiryPolicy::getId() const {
sys::Mutex::ScopedLock l(lock);
return expiryId;
}
// Called in enqueuing connection thread
void ExpiryPolicy::willExpire(broker::Message& m) {
uint64_t id;
{
// When messages are fanned out to multiple queues, update sends
// them as independenty messages so we can have multiple messages
// with the same expiry ID.
//
sys::Mutex::ScopedLock l(lock);
id = expiryId++;
if (!id) { // This is an update of an already-expired message.
m.setExpiryPolicy(expiredPolicy);
}
else {
assert(unexpiredByMessage.find(&m) == unexpiredByMessage.end());
// If this is an update, the id may already exist
unexpiredById.insert(IdMessageMap::value_type(id, &m));
unexpiredByMessage[&m] = id;
}
}
timer.add(new ExpiryTask(this, id, m.getExpiration()));
}
// Called in dequeueing connection thread
void ExpiryPolicy::forget(broker::Message& m) {
sys::Mutex::ScopedLock l(lock);
MessageIdMap::iterator i = unexpiredByMessage.find(&m);
assert(i != unexpiredByMessage.end());
unexpiredById.erase(i->second);
unexpiredByMessage.erase(i);
}
// Called in dequeueing connection or cleanup thread.
bool ExpiryPolicy::hasExpired(broker::Message& m) {
sys::Mutex::ScopedLock l(lock);
return unexpiredByMessage.find(&m) == unexpiredByMessage.end();
}
// Called in timer thread
void ExpiryPolicy::sendExpire(uint64_t id) {
{
sys::Mutex::ScopedLock l(lock);
// Don't multicast an expiry notice if message is already forgotten.
if (unexpiredById.find(id) == unexpiredById.end()) return;
}
mcast.mcastControl(framing::ClusterMessageExpiredBody(framing::ProtocolVersion(), id), memberId);
}
// Called in CPG deliver thread.
void ExpiryPolicy::deliverExpire(uint64_t id) {
sys::Mutex::ScopedLock l(lock);
std::pair<IdMessageMap::iterator, IdMessageMap::iterator> expired = unexpiredById.equal_range(id);
IdMessageMap::iterator i = expired.first;
while (i != expired.second) {
i->second->setExpiryPolicy(expiredPolicy); // hasExpired() == true;
unexpiredByMessage.erase(i->second);
unexpiredById.erase(i++);
}
}
// Called in update thread on the updater.
boost::optional<uint64_t> ExpiryPolicy::getId(broker::Message& m) {
sys::Mutex::ScopedLock l(lock);
MessageIdMap::iterator i = unexpiredByMessage.find(&m);
return i == unexpiredByMessage.end() ? boost::optional<uint64_t>() : i->second;
}
bool ExpiryPolicy::Expired::hasExpired(broker::Message&) { return true; }
void ExpiryPolicy::Expired::willExpire(broker::Message&) { }
}} // namespace qpid::cluster
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