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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 "PeriodicTimerImpl.h"
#include "Cluster.h"
#include "qpid/framing/ProtocolVersion.h"
#include "qpid/framing/ClusterPeriodicTimerBody.h"
namespace qpid {
namespace cluster {
PeriodicTimerImpl::PeriodicTimerImpl(Cluster& c) : cluster(c) {}
PeriodicTimerImpl::TaskEntry::TaskEntry(
Cluster& c, const Task& t, sys::Duration d, const std::string& n)
: TimerTask(d), cluster(c), timer(c.getBroker().getTimer()),
task(t), name(n), inFlight(false)
{
timer.add(this);
}
void PeriodicTimerImpl::TaskEntry::fire() {
setupNextFire();
timer.add(this);
bool isElder = cluster.isElder(); // Call outside lock to avoid deadlock.
sys::Mutex::ScopedLock l(lock);
// Only the elder mcasts.
// Don't mcast another if we haven't yet received the last one.
if (isElder && !inFlight) {
QPID_LOG(trace, "Sending periodic-timer control for " << name);
inFlight = true;
cluster.getMulticast().mcastControl(
framing::ClusterPeriodicTimerBody(framing::ProtocolVersion(), name),
cluster.getId());
}
}
void PeriodicTimerImpl::TaskEntry::deliver() {
task();
sys::Mutex::ScopedLock l(lock);
inFlight = false;
}
void PeriodicTimerImpl::add(
const Task& task, sys::Duration period, const std::string& name)
{
sys::Mutex::ScopedLock l(lock);
QPID_LOG(debug, "Periodic timer add entry for " << name);
if (map.find(name) != map.end())
throw Exception(QPID_MSG("Cluster timer task name added twice: " << name));
map[name] = new TaskEntry(cluster, task, period, name);
}
void PeriodicTimerImpl::deliver(const std::string& name) {
Map::iterator i;
{
sys::Mutex::ScopedLock l(lock);
i = map.find(name);
if (i == map.end())
throw Exception(QPID_MSG("Cluster timer unknown task: " << name));
}
QPID_LOG(debug, "Periodic timer execute " << name);
i->second->deliver();
}
}} // namespace qpid::cluster
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