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// **********************************************************************
//
// Copyright (c) 2003-2018 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/WaitQueue.h>
using namespace std;
using namespace IceGrid;
WaitItem::WaitItem()
{
}
WaitItem::~WaitItem()
{
}
const IceUtil::Time&
WaitItem:: getExpirationTime()
{
return _expiration;
}
void
WaitItem::setExpirationTime(const IceUtil::Time& time)
{
_expiration = time;
}
WaitQueue::WaitQueue() :
Thread("IceGrid wait queue thread"),
_destroyed(false)
{
}
void
WaitQueue::run()
{
while(true)
{
list<WaitItemPtr> expired;
{
Lock sync(*this);
if(_waitQueue.empty() && !_destroyed)
{
wait();
}
if(_destroyed)
{
break;
}
//
// Notify expired items.
//
while(!_waitQueue.empty() && !_destroyed)
{
WaitItemPtr item = _waitQueue.front();
if(item->getExpirationTime() <= IceUtil::Time::now(IceUtil::Time::Monotonic))
{
expired.push_back(item);
_waitQueue.pop_front();
}
else if(!expired.empty())
{
break;
}
else
{
//
// Wait until the next item expire or a notification. Note: in any case we
// get out of this loop to get a chance to execute the work queue.
//
timedWait(item->getExpirationTime() - IceUtil::Time::now(IceUtil::Time::Monotonic));
}
}
}
if(!expired.empty())
{
for(list<WaitItemPtr>::iterator p = expired.begin(); p != expired.end(); ++p)
{
try
{
(*p)->expired(false);
}
catch(const Ice::LocalException&)
{
//
// TODO: Add some tracing.
//
}
}
}
if(_destroyed)
{
break;
}
}
if(!_waitQueue.empty())
{
for(list<WaitItemPtr>::iterator p = _waitQueue.begin(); p != _waitQueue.end(); ++p)
{
(*p)->expired(true);
}
}
_waitQueue.clear(); // Break cyclic reference counts.
}
void
WaitQueue::destroy()
{
{
Lock sync(*this);
_destroyed = true;
notify();
}
getThreadControl().join();
}
void
WaitQueue::add(const WaitItemPtr& item, const IceUtil::Time& wait)
{
Lock sync(*this);
if(_destroyed)
{
return;
}
//
// We'll have to notify the thread if it's sleeping for good.
//
bool notifyThread = _waitQueue.empty();
IceUtil::Time expire = IceUtil::Time::now(IceUtil::Time::Monotonic) + wait;
item->setExpirationTime(expire);
list<WaitItemPtr>::iterator p = _waitQueue.begin();
while(p != _waitQueue.end())
{
if((*p)->getExpirationTime() >= expire)
{
break;
}
++p;
}
_waitQueue.insert(p, item);
if(notifyThread)
{
notify();
}
}
bool
WaitQueue::remove(const WaitItemPtr& item)
{
Lock sync(*this);
list<WaitItemPtr>::iterator p = _waitQueue.begin();
while(p != _waitQueue.end())
{
if((*p).get() == item.get())
{
_waitQueue.erase(p);
return true;
}
++p;
}
return false;
}
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