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// **********************************************************************
//
// Copyright (c) 2003-2009 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>
#include <IceGrid/Internal.h>
namespace IceGrid
{
template<class TPrx>
class SessionKeepAliveThread : public IceUtil::Thread, public IceUtil::Monitor<IceUtil::Mutex>
{
enum State
{
Disconnected,
Connected,
InProgress,
Destroyed
};
enum Action
{
Connect,
Disconnect,
KeepAlive,
None
};
public:
SessionKeepAliveThread(const InternalRegistryPrx& registry, const Ice::LoggerPtr& logger) :
IceUtil::Thread("IceGrid session keepalive thread"),
_registry(registry),
_logger(logger),
_state(InProgress),
_nextAction(None)
{
}
virtual void
run()
{
TPrx session;
InternalRegistryPrx registry;
IceUtil::Time timeout = IceUtil::Time::seconds(15);
Action action = Connect;
try
{
while(true)
{
{
Lock sync(*this);
if(_state == Destroyed)
{
break;
}
//
// Update the current state.
//
assert(_state == InProgress);
_state = session ? Connected : Disconnected;
_session = session;
if(_session)
{
_registry = registry;
}
if(_nextAction == Connect && _state == Connected)
{
_nextAction = KeepAlive;
}
else if(_nextAction == Disconnect && _state == Disconnected)
{
_nextAction = None;
}
else if(_nextAction == KeepAlive && _state == Disconnected)
{
_nextAction = Connect;
}
notifyAll();
//
// Wait if there's nothing to do and if we are
// connected or if we've just tried to connect.
//
if(_nextAction == None)
{
if(_state == Connected || action == Connect || action == KeepAlive)
{
IceUtil::Time now = IceUtil::Time::now();
IceUtil::Time wakeTime = now + timeout;
while(_state != Destroyed && _nextAction == None && wakeTime > now)
{
timedWait(wakeTime - now);
now = IceUtil::Time::now();
}
}
if(_nextAction == None)
{
_nextAction = session ? KeepAlive : Connect;
}
}
if(_state == Destroyed)
{
break;
}
assert(_nextAction != None);
action = _nextAction;
registry = InternalRegistryPrx::uncheckedCast(
_registry->ice_timeout(static_cast<int>(timeout.toMilliSeconds())));
_nextAction = None;
_state = InProgress;
notifyAll();
}
switch(action)
{
case Connect:
assert(!session);
session = createSession(registry, timeout);
break;
case Disconnect:
assert(session);
destroySession(session);
session = 0;
break;
case KeepAlive:
assert(session);
if(!keepAlive(session))
{
session = createSession(registry, timeout);
}
break;
case None:
default:
assert(false);
}
}
//
// Destroy the session.
//
if(_nextAction == Disconnect && session)
{
destroySession(session);
}
}
catch(const std::exception& ex)
{
Ice::Error out(_logger);
out << "unknown exception in session manager keep alive thread:\n" << ex.what();
throw;
}
catch(...)
{
Ice::Error out(_logger);
out << "unknown exception in session manager keep alive thread";
throw;
}
}
virtual bool
waitForCreate()
{
Lock sync(*this);
while(_state != Destroyed && _state != Connected)
{
wait();
}
return _state != Destroyed;
}
virtual void
tryCreateSession(bool waitForTry = true, const IceUtil::Time& timeout = IceUtil::Time())
{
{
Lock sync(*this);
if(_state == Destroyed)
{
return;
}
if(_state == Connected)
{
_nextAction = KeepAlive;
}
else
{
_nextAction = Connect;
}
notifyAll();
}
if(waitForTry)
{
Lock sync(*this);
// Wait until the action is executed and the state changes.
while(_nextAction == Connect || _nextAction == KeepAlive || _state == InProgress)
{
if(timeout == IceUtil::Time())
{
wait();
}
else
{
if(!timedWait(timeout))
{
break;
}
}
}
}
}
void
destroyActiveSession()
{
Lock sync(*this);
if(_state == Destroyed || _state == Disconnected)
{
return;
}
_nextAction = Disconnect;
notifyAll();
}
bool
terminateIfDisconnected()
{
Lock sync(*this);
if(_state != Disconnected)
{
return false; // Nothing we can do for now.
}
assert(_state != Destroyed);
_state = Destroyed;
_nextAction = None;
notifyAll();
return true;
}
void
terminate(bool destroySession = true)
{
Lock sync(*this);
if(_state == Destroyed)
{
return;
}
assert(_state != Destroyed);
_state = Destroyed;
_nextAction = destroySession ? Disconnect : None;
notifyAll();
}
TPrx
getSession()
{
Lock sync(*this);
return _session;
}
void
setRegistry(const InternalRegistryPrx& registry)
{
Lock sync(*this);
_registry = registry;
}
InternalRegistryPrx
getRegistry() const
{
Lock sync(*this);
return _registry;
}
virtual TPrx createSession(InternalRegistryPrx&, IceUtil::Time&) = 0;
virtual void destroySession(const TPrx&) = 0;
virtual bool keepAlive(const TPrx&) = 0;
protected:
InternalRegistryPrx _registry;
Ice::LoggerPtr _logger;
TPrx _session;
State _state;
Action _nextAction;
};
};
#endif
|
