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// **********************************************************************
//
// Copyright (c) 2003-2014 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
#include <Ice/Ice.h>
#include <IceGrid/ReapThread.h>
using namespace std;
using namespace IceGrid;
ReapThread::ReapThread() :
IceUtil::Thread("Icegrid reaper thread"),
_terminated(false)
{
}
void
ReapThread::run()
{
vector<ReapableItem> reap;
while(true)
{
{
Lock sync(*this);
if(_terminated)
{
break;
}
calcWakeInterval();
//
// If the wake interval is zero then we wait forever.
//
if(_wakeInterval == IceUtil::Time())
{
wait();
}
else
{
timedWait(_wakeInterval);
}
if(_terminated)
{
break;
}
list<ReapableItem>::iterator p = _sessions.begin();
while(p != _sessions.end())
{
try
{
if(p->timeout == IceUtil::Time())
{
p->item->timestamp(); // This should throw if the reapable is destroyed.
++p;
}
else if((IceUtil::Time::now(IceUtil::Time::Monotonic) - p->item->timestamp()) > p->timeout)
{
reap.push_back(*p);
p = _sessions.erase(p);
}
else
{
++p;
}
}
catch(const Ice::ObjectNotExistException&)
{
p = _sessions.erase(p);
}
}
}
for(vector<ReapableItem>::const_iterator p = reap.begin(); p != reap.end(); ++p)
{
p->item->destroy(false);
}
reap.clear();
}
}
void
ReapThread::terminate()
{
list<ReapableItem> reap;
{
Lock sync(*this);
if(_terminated)
{
assert(_sessions.empty());
return;
}
_terminated = true;
notify();
reap.swap(_sessions);
}
for(list<ReapableItem>::iterator p = reap.begin(); p != reap.end(); ++p)
{
p->item->destroy(true);
}
}
void
ReapThread::add(const ReapablePtr& reapable, int timeout)
{
Lock sync(*this);
if(_terminated)
{
return;
}
//
// NOTE: registering a reapable with a null timeout is allowed. The reapable is reaped
// only when the reaper thread is shutdown.
//
//
// 10 seconds is the minimum permissable timeout.
//
if(timeout > 0 && timeout < 10)
{
timeout = 10;
}
ReapableItem item;
item.item = reapable;
item.timeout = timeout == 0 ? IceUtil::Time() : IceUtil::Time::seconds(timeout);
_sessions.push_back(item);
if(timeout > 0)
{
//
// If there is a new minimum wake interval then wake the reaping
// thread.
//
if(calcWakeInterval())
{
notify();
}
//
// Since we just added a new session with a non null timeout there
// must be a non-zero wakeInterval.
//
assert(_wakeInterval != IceUtil::Time());
}
}
//
// Returns true if the calculated wake interval is less than the current wake
// interval (or if the original wake interval was "forever").
//
bool
ReapThread::calcWakeInterval()
{
// Re-calculate minimum timeout
IceUtil::Time oldWakeInterval = _wakeInterval;
IceUtil::Time minimum;
bool first = true;
for(list<ReapableItem>::const_iterator p = _sessions.begin(); p != _sessions.end(); ++p)
{
if(p->timeout != IceUtil::Time() && (first || p->timeout < minimum))
{
minimum = p->timeout;
first = false;
}
}
_wakeInterval = minimum;
return oldWakeInterval == IceUtil::Time() || minimum < oldWakeInterval;
}
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