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// **********************************************************************
//
// Copyright (c) 2001
// ZeroC, Inc.
// Huntsville, AL, USA
//
// All Rights Reserved
//
// **********************************************************************
#include <Ice/Ice.h>
#include <IceStorm/TopicManagerI.h>
#include <IceStorm/TopicI.h>
#include <IceStorm/Flusher.h>
#include <IceStorm/TraceLevels.h>
#include <functional>
using namespace IceStorm;
using namespace std;
TopicManagerI::TopicManagerI(const Ice::CommunicatorPtr& communicator, const Ice::ObjectAdapterPtr& adapter,
const TraceLevelsPtr& traceLevels, const Freeze::DBEnvironmentPtr& dbEnv,
const Freeze::DBPtr& db) :
_communicator(communicator),
_adapter(adapter),
_traceLevels(traceLevels),
_dbEnv(dbEnv),
_topics(db)
{
_flusher = new Flusher(_communicator, _traceLevels);
_factory = new SubscriberFactory(_traceLevels, _flusher);
//
// Recreate each of the topics in the dictionary. If the topic
// database doesn't exist then the topic was previously destroyed,
// but not removed from the _topics dictionary. Normally this
// should only occur upon a crash.
//
StringBoolDict::iterator p = _topics.begin();
while(p != _topics.end())
{
assert(_topicIMap.find(p->first) == _topicIMap.end());
try
{
installTopic("recreate", p->first, false);
++p;
}
catch(const Freeze::DBNotFoundException& ex)
{
if(_traceLevels->topicMgr > 0)
{
Ice::Trace out(_traceLevels->logger, _traceLevels->topicMgrCat);
out << ex;
}
StringBoolDict::iterator tmp = p;
++p;
_topics.erase(tmp);
}
}
}
TopicManagerI::~TopicManagerI()
{
}
TopicPrx
TopicManagerI::create(const string& name, const Ice::Current&)
{
// TODO: reader/writer mutex
IceUtil::Mutex::Lock sync(*this);
reap();
if(_topicIMap.find(name) != _topicIMap.end())
{
TopicExists ex;
ex.name = name;
throw ex;
}
installTopic("create", name, true);
_topics.insert(make_pair(name, true));
//
// The identity is the name of the Topic.
//
Ice::Identity id;
id.name = name;
return TopicPrx::uncheckedCast(_adapter->createProxy(id));
}
TopicPrx
TopicManagerI::retrieve(const string& name, const Ice::Current&) const
{
IceUtil::Mutex::Lock sync(*this);
TopicManagerI* const This = const_cast<TopicManagerI* const>(this);
This->reap();
if(_topicIMap.find(name) != _topicIMap.end())
{
Ice::Identity id;
id.name = name;
return TopicPrx::uncheckedCast(_adapter->createProxy(id));
}
NoSuchTopic ex;
ex.name = name;
throw ex;
}
//
// The arguments cannot be const & (for some reason)
//
static TopicDict::value_type
transformToTopicDict(TopicIMap::value_type p, Ice::ObjectAdapterPtr adapter)
{
Ice::Identity id;
id.name = p.first;
return TopicDict::value_type(p.first, TopicPrx::uncheckedCast(adapter->createProxy(id)));
}
TopicDict
TopicManagerI::retrieveAll(const Ice::Current&) const
{
IceUtil::Mutex::Lock sync(*this);
TopicManagerI* const This = const_cast<TopicManagerI* const>(this);
This->reap();
TopicDict all;
transform(_topicIMap.begin(), _topicIMap.end(), inserter(all, all.begin()),
bind2nd(ptr_fun(transformToTopicDict), _adapter));
return all;
}
void
TopicManagerI::subscribe(const QoS& qos, const Ice::ObjectPrx& subscriber, const Ice::Current&)
{
IceUtil::Mutex::Lock sync(*this);
Ice::Identity ident = subscriber->ice_getIdentity();
if(_traceLevels->topicMgr > 0)
{
Ice::Trace out(_traceLevels->logger, _traceLevels->topicMgrCat);
out << "Subscribe: " << Ice::identityToString(ident);
if(_traceLevels->topicMgr > 1)
{
out << " QoS: ";
for(QoS::const_iterator qi = qos.begin(); qi != qos.end() ; ++qi)
{
if(qi != qos.begin())
{
out << ',';
}
out << '[' << qi->first << "," << qi->second << ']';
}
}
}
//
// Ensure that the identities category refers to an existing
// channel.
//
TopicIMap::iterator elem = _topicIMap.find(ident.category);
if(elem == _topicIMap.end())
{
NoSuchTopic ex;
ex.name = ident.category;
throw ex;
}
//
// Subscribe to the topic.
//
elem->second->subscribe(subscriber, qos);
}
void
TopicManagerI::unsubscribe(const Ice::ObjectPrx& subscriber, const Ice::Current&)
{
IceUtil::Mutex::Lock sync(*this);
Ice::Identity ident = subscriber->ice_getIdentity();
if(_traceLevels->topicMgr > 0)
{
Ice::Trace out(_traceLevels->logger, _traceLevels->topicMgrCat);
out << "Unsubscribe: " << Ice::identityToString(ident);
}
TopicIMap::iterator elem = _topicIMap.find(ident.category);
if(elem != _topicIMap.end())
{
elem->second->unsubscribe(subscriber);
}
}
void
TopicManagerI::shutdown(const Ice::Current&)
{
_flusher->stopFlushing();
_communicator->shutdown();
}
void
TopicManagerI::reap()
{
//
// Always Called with mutex locked
//
// IceUtil::Mutex::Lock sync(*this);
//
TopicIMap::iterator i = _topicIMap.begin();
while(i != _topicIMap.end())
{
if(i->second->destroyed())
{
if(_traceLevels->topicMgr > 0)
{
Ice::Trace out(_traceLevels->logger, _traceLevels->topicMgrCat);
out << "Reaping " << i->first;
}
_topics.erase(i->first);
_topicIMap.erase(i++);
}
else
{
++i;
}
}
}
void
TopicManagerI::installTopic(const std::string& message, const std::string& name, bool create)
{
if(_traceLevels->topicMgr > 0)
{
Ice::Trace out(_traceLevels->logger, _traceLevels->topicMgrCat);
out << message << ' ' << name;
}
// TODO: instance
// TODO: reserved names?
// TODO: failure? cleanup database?
Freeze::DBPtr db = _dbEnv->openDB(name, create);
//
// Create topic implementation
//
TopicIPtr topicI = new TopicI(_adapter, _traceLevels, name, _factory, db);
//
// The identity is the name of the Topic.
//
Ice::Identity id;
id.name = name;
_adapter->add(topicI, id);
_topicIMap.insert(TopicIMap::value_type(name, topicI));
}
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