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// **********************************************************************
//
// Copyright (c) 2003-2006 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.
//
// **********************************************************************
#ifndef ICE_GRID_SESSION_MANAGER_H
#define ICE_GRID_SESSION_MANAGER_H
#include <IceUtil/Handle.h>
#include <IceUtil/Mutex.h>
#include <IceUtil/Monitor.h>
#include <IceUtil/Thread.h>
#include <IceGrid/Query.h>
namespace IceGrid
{
template<class TPrx, class FPrx>
class SessionKeepAliveThread : public IceUtil::Thread, public IceUtil::Monitor<IceUtil::Mutex>
{
enum State
{
Disconnected,
Connected,
Retry,
DestroySession,
Destroyed
};
public:
SessionKeepAliveThread(const FPrx& factory) :
_factory(factory),
_state(Disconnected)
{
}
virtual void
run()
{
TPrx session;
FPrx factory = _factory;
bool updateState = false;
IceUtil::Time timeout = IceUtil::Time::seconds(10);
bool destroy = false;
while(true)
{
//
// Send a keep alive message to the session.
//
if(session)
{
if(!keepAlive(session))
{
session = 0;
}
updateState |= !session;
}
//
// If the session isn't established yet, try to create a new
// session.
//
if(!session)
{
session = createSession(factory, timeout);
updateState |= session;
}
//
// If we failed to create the session with the factory and
// the factory proxy is a direct proxy, we check with the
// Query interface if the factory proxy was updated. It's
// possible that the factory was restarted for example.
//
if(!session && !factory->ice_getEndpoints().empty())
{
std::string instanceName = factory->ice_getIdentity().category;
try
{
QueryPrx query = QueryPrx::uncheckedCast(
factory->ice_getCommunicator()->stringToProxy(instanceName + "/Query"));
Ice::ObjectPrx obj = query->findObjectById(factory->ice_getIdentity());
FPrx newFactory = FPrx::uncheckedCast(obj);
if(newFactory != factory)
{
session = createSession(newFactory, timeout);
factory = newFactory;
updateState |= session;
}
}
catch(const Ice::LocalException&)
{
}
}
if(updateState)
{
Lock sync(*this);
if(_state != Destroyed)
{
_state = session ? Connected : Disconnected;
}
_factory = factory;
_session = session;
notifyAll();
}
//
// Wait for the configured timeout duration.
//
{
Lock sync(*this);
if(_state == Connected || _state == Disconnected)
{
timedWait(timeout);
}
if(_state == Destroyed)
{
break;
}
if(_state == DestroySession && session)
{
destroy = true;
}
updateState = _state == Retry || _state == DestroySession;
factory = _factory;
}
if(destroy)
{
assert(session);
destroySession(session);
destroy = false;
session = 0;
}
}
//
// Destroy the session.
//
if(session)
{
destroySession(session);
}
}
virtual bool
waitForCreate()
{
Lock sync(*this);
while(_state != Destroyed && _state != Connected)
{
wait();
}
return _state != Destroyed;
}
virtual bool
tryCreateSession(FPrx factory)
{
{
Lock sync(*this);
while(_state == Retry)
{
wait();
}
if(_state == Destroyed)
{
return false;
}
_state = Retry;
if(factory)
{
_factory = factory;
}
notifyAll();
}
{
Lock sync(*this);
while(_state == Retry)
{
wait();
}
}
return true;
}
void
destroyActiveSession()
{
Lock sync(*this);
_state = DestroySession;
notifyAll();
}
void
terminate()
{
Lock sync(*this);
_state = Destroyed;
notifyAll();
}
TPrx
getSession()
{
Lock sync(*this);
return _session;
}
virtual TPrx createSession(const FPrx&, IceUtil::Time&) = 0;
virtual void destroySession(const TPrx&) = 0;
virtual bool keepAlive(const TPrx&) = 0;
protected:
FPrx _factory;
TPrx _session;
State _state;
};
};
#endif
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