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// **********************************************************************
//
// Copyright (c) 2003-2010 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 <IceStorm/Observers.h>
#include <IceStorm/Instance.h>
#include <IceStorm/TraceLevels.h>
using namespace std;
using namespace IceStorm;
using namespace IceStormElection;
namespace
{
class AMI_ReplicaObserver_createTopicI : public AMI_ReplicaObserver_createTopic, public AMICall
{
public:
virtual void ice_response() { response(); }
virtual void ice_exception(const Ice::Exception& e) { exception(e); }
};
typedef IceUtil::Handle<AMI_ReplicaObserver_createTopicI> AMI_ReplicaObserver_createTopicIPtr;
class AMI_ReplicaObserver_addSubscriberI : public AMI_ReplicaObserver_addSubscriber, public AMICall
{
public:
virtual void ice_response() { response(); }
virtual void ice_exception(const Ice::Exception& e) { exception(e); }
};
typedef IceUtil::Handle<AMI_ReplicaObserver_addSubscriberI> AMI_ReplicaObserver_addSubscriberIPtr;
class AMI_ReplicaObserver_removeSubscriberI : public AMI_ReplicaObserver_removeSubscriber, public AMICall
{
public:
virtual void ice_response() { response(); }
virtual void ice_exception(const Ice::Exception& e) { exception(e); }
};
typedef IceUtil::Handle<AMI_ReplicaObserver_removeSubscriberI> AMI_ReplicaObserver_removeSubscriberIPtr;
class AMI_ReplicaObserver_destroyTopicI : public AMI_ReplicaObserver_destroyTopic, public AMICall
{
public:
virtual void ice_response() { response(); }
virtual void ice_exception(const Ice::Exception& e) { exception(e); }
};
typedef IceUtil::Handle<AMI_ReplicaObserver_destroyTopicI> AMI_ReplicaObserver_destroyTopicIPtr;
}
AMICall::AMICall() :
_response(false)
{
}
void
AMICall::response()
{
Lock sync(*this);
_response = true;
notify();
}
void
AMICall::exception(const IceUtil::Exception& e)
{
Lock sync(*this);
_response = true;
_ex.reset(e.ice_clone());
notify();
}
void
AMICall::waitResponse()
{
Lock sync(*this);
while(!_response)
{
wait();
}
if(_ex.get())
{
_ex->ice_throw();
}
}
Observers::Observers(const InstancePtr& instance) :
_traceLevels(instance->traceLevels()),
_majority(0)
{
}
void
Observers::setMajority(unsigned int majority)
{
_majority = majority;
}
bool
Observers::check()
{
Lock sync(*this);
if(_observers.size() >= _majority)
{
vector<ObserverInfo>::iterator p = _observers.begin();
while(p != _observers.end())
{
try
{
p->observer->ice_ping();
}
catch(const Ice::Exception& ex)
{
if(_traceLevels->replication > 0)
{
Ice::Trace out(_traceLevels->logger, _traceLevels->replicationCat);
out << "ice_ping failed: " << ex;
}
int id = p->id;
p = _observers.erase(p);
// COMPILERFIX: Just using following causes double unlock with C++Builder 2007
//IceUtil::Mutex::Lock sync(_reapedMutex);
_reapedMutex.lock();
_reaped.push_back(id);
_reapedMutex.unlock();
continue;
}
++p;
}
}
return _majority == 0 || _observers.size() >= _majority;
}
void
Observers::clear()
{
Lock sync(*this);
_observers.clear();
}
void
Observers::getReapedSlaves(std::vector<int>& d)
{
IceUtil::Mutex::Lock sync(_reapedMutex);
d.swap(_reaped);
}
void
Observers::init(const set<GroupNodeInfo>& slaves, const LogUpdate& llu, const TopicContentSeq& content)
{
{
IceUtil::Mutex::Lock sync(_reapedMutex);
_reaped.clear();
}
Lock sync(*this);
_observers.clear();
for(set<GroupNodeInfo>::const_iterator p = slaves.begin(); p != slaves.end(); ++p)
{
try
{
assert(p->observer);
//ReplicaObserverPrx observer = ReplicaObserverPrx::uncheckedCast(p->observer);
// 60s timeout for reliability in the event that a replica
// becomes unresponsive.
ReplicaObserverPrx observer = ReplicaObserverPrx::uncheckedCast(p->observer->ice_timeout(60 * 1000));
observer->init(llu, content);
_observers.push_back(ObserverInfo(p->id, observer));
}
catch(const Ice::Exception& ex)
{
if(_traceLevels->replication > 0)
{
Ice::Trace out(_traceLevels->logger, _traceLevels->replicationCat);
out << "error calling init on " << p->id << " ex: " << ex;
}
throw;
}
}
}
void
Observers::createTopic(const LogUpdate& llu, const string& name)
{
Lock sync(*this);
for(vector<ObserverInfo>::iterator p = _observers.begin(); p != _observers.end(); ++p)
{
AMI_ReplicaObserver_createTopicIPtr cb = new AMI_ReplicaObserver_createTopicI;
p->call = cb;
p->observer->createTopic_async(cb, llu, name);
}
wait("createTopic");
}
void
Observers::destroyTopic(const LogUpdate& llu, const string& id)
{
Lock sync(*this);
for(vector<ObserverInfo>::iterator p = _observers.begin(); p != _observers.end(); ++p)
{
AMI_ReplicaObserver_destroyTopicIPtr cb = new AMI_ReplicaObserver_destroyTopicI;
p->call = cb;
p->observer->destroyTopic_async(cb, llu, id);
}
wait("destroyTopic");
}
void
Observers::addSubscriber(const LogUpdate& llu, const string& name, const SubscriberRecord& rec)
{
Lock sync(*this);
for(vector<ObserverInfo>::iterator p = _observers.begin(); p != _observers.end(); ++p)
{
AMI_ReplicaObserver_addSubscriberIPtr cb = new AMI_ReplicaObserver_addSubscriberI;
p->call = cb;
p->observer->addSubscriber_async(cb, llu, name, rec);
}
wait("addSubscriber");
}
void
Observers::removeSubscriber(const LogUpdate& llu, const string& name, const Ice::IdentitySeq& id)
{
Lock sync(*this);
for(vector<ObserverInfo>::iterator p = _observers.begin(); p != _observers.end(); ++p)
{
AMI_ReplicaObserver_removeSubscriberIPtr cb = new AMI_ReplicaObserver_removeSubscriberI;
p->call = cb;
p->observer->removeSubscriber_async(cb, llu, name, id);
}
wait("removeSubscriber");
}
void
Observers::wait(const string& op)
{
vector<ObserverInfo>::iterator p = _observers.begin();
while(p != _observers.end())
{
try
{
p->call->waitResponse();
}
catch(const Ice::Exception& ex)
{
if(_traceLevels->replication > 0)
{
Ice::Trace out(_traceLevels->logger, _traceLevels->replicationCat);
out << op << ": " << ex;
}
int id = p->id;
p = _observers.erase(p);
// COMPILERFIX: Just using following causes double unlock with C++Builder 2007
//IceUtil::Mutex::Lock sync(_reapedMutex);
_reapedMutex.lock();
_reaped.push_back(id);
_reapedMutex.unlock();
continue;
}
++p;
}
// If we now no longer have the majority of observers we raise.
if(_observers.size() < _majority)
{
// TODO: Trace here?
//Ice::Trace out(_traceLevels->logger, _traceLevels->replicationCat);
//out << op;
throw Ice::UnknownException(__FILE__, __LINE__);
}
}
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