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// **********************************************************************
//
// Copyright (c) 2001
// MutableRealms, Inc.
// Huntsville, AL, USA
//
// All Rights Reserved
//
// **********************************************************************
#include <Ice/Ice.h>
#include <Ice/Functional.h>
#include <IceStorm/TopicI.h>
#include <IceStorm/Flusher.h>
#include <IceStorm/Subscriber.h>
#include <IceStorm/TraceLevels.h>
#include <algorithm>
using namespace IceStorm;
using namespace std;
namespace IceStorm
{
//
// The servant has a 1-1 association with a topic. It is used to
// receive events from Publishers.
//
class BlobjectI : public Ice::Blobject
{
public:
BlobjectI(const IceStorm::TopicSubscribersPtr& s) :
_subscribers(s)
{
}
~BlobjectI()
{
}
virtual void ice_invoke(const vector< Ice::Byte>&, vector< Ice::Byte>&, const Ice::Current&);
private:
//
// Set of associated subscribers
//
IceStorm::TopicSubscribersPtr _subscribers;
};
class TopicSubscribers : public IceUtil::Shared, public JTCMutex
{
public:
TopicSubscribers(const TraceLevelsPtr& traceLevels, const Ice::LoggerPtr& logger, const string& topic,
const FlusherPtr& flusher) :
_traceLevels(traceLevels),
_logger(logger),
_topic(topic),
_flusher(flusher)
{
}
~TopicSubscribers()
{
}
void
add(const Ice::ObjectPrx& s, const string& idPrefix, const QoS& qos)
{
//
// Create the full topic subscriber id (<prefix>#<topic>)
//
string id = idPrefix;
id += '#';
id += _topic;
//
// Change the identity of the proxy
//
Ice::ObjectPrx obj = s->ice_newIdentity(id);
SubscriberPtr subscriber = new Subscriber(_logger, _traceLevels, _flusher, qos, obj);
JTCSyncT<JTCMutex> sync(*this);
//
// Add to the set of subscribers
//
_subscribers.push_back(subscriber);
}
void
remove(const string& idPrefix)
{
JTCSyncT<JTCMutex> sync(*this);
//
// Create the full topic subscriber id (<prefix>#<topic>)
//
string id = idPrefix;
id += '#';
id += _topic;
SubscriberList::iterator i;
for (i = _subscribers.begin() ; i != _subscribers.end(); ++i)
{
if ((*i)->id() == id)
{
//
// This marks the subscriber as invalid. It will be
// removed on the next event publish.
//
(*i)->unsubscribe();
break;
}
}
//
// If the subscriber was not found then display a diagnostic
//
if (i == _subscribers.end())
{
if (_traceLevels->topic > 0)
{
ostringstream s;
s << _topic << ": " << id << "not subscribed.";
_logger->trace(_traceLevels->topicCat, s.str());
}
}
}
void
publish(const string& op, bool nonmutating, const vector< Ice::Byte>& blob)
{
JTCSyncT<JTCMutex> sync(*this);
//
// Using standard algorithms I don't think there is a way to
// do this in one pass. For instance, I thought about using
// remove_if - but the predicate needs to be a pure function
// (see Meyers for details). If this is fixed then fix Flusher
// also.
//
// remove_if doesn't work with handle types. remove_if also //
// isn't present in the STLport implementation
//
// _subscribers.remove_if(IceUtil::constMemFun(&Subscriber::invalid));
//
_subscribers.erase(remove_if(_subscribers.begin(), _subscribers.end(),
IceUtil::constMemFun(&Subscriber::invalid)), _subscribers.end());
for (SubscriberList::iterator i = _subscribers.begin(); i != _subscribers.end(); ++i)
{
(*i)->publish(op, nonmutating, blob);
}
//for_each(_subscribers.begin(), _subscribers.end(), Ice::memFun(&Subscriber::publish));
}
private:
TraceLevelsPtr _traceLevels;
Ice::LoggerPtr _logger;
string _topic;
FlusherPtr _flusher;
SubscriberList _subscribers;
};
} // End namespace IceStorm
void
BlobjectI::ice_invoke(const vector< Ice::Byte>& inParams, vector< Ice::Byte>& outParam, const Ice::Current& current)
{
_subscribers->publish(current.operation, current.nonmutating, inParams);
}
TopicI::TopicI(const Ice::ObjectAdapterPtr& adapter, const TraceLevelsPtr& traceLevels, const Ice::LoggerPtr& logger,
const string& name, const FlusherPtr& flusher) :
_adapter(adapter),
_traceLevels(traceLevels),
_logger(logger),
_name(name),
_flusher(flusher),
_destroyed(false)
{
_subscribers = new TopicSubscribers(_traceLevels, _logger, _name, _flusher);
//
// Create a servant per Topic to receive event data. The servants
// object-id is <topic>#publish. Active the object and save a
// reference to give to publishers.
//
_publisher = new BlobjectI(_subscribers);
string id = name;
id += '#';
id += "publish";
_adapter->add(_publisher, id);
_obj = adapter->createProxy(id);
}
TopicI::~TopicI()
{
}
string
TopicI::getName(const Ice::Current&)
{
return _name;
}
Ice::ObjectPrx
TopicI::getPublisher(const Ice::Current&)
{
return _obj;
}
void
TopicI::destroy(const Ice::Current&)
{
JTCSyncT<JTCMutex> sync(_destroyedMutex);
if (_traceLevels->topic > 0)
{
ostringstream s;
s << "Destroy " << _name;
_logger->trace(_traceLevels->topicCat, s.str());
}
_adapter->remove(_name);
_destroyed = true;
}
bool
TopicI::destroyed() const
{
JTCSyncT<JTCMutex> sync(_destroyedMutex);
return _destroyed;
}
void
TopicI::subscribe(const Ice::ObjectPrx& tmpl, const string& id, const QoS& qos)
{
_subscribers->add(tmpl, id, qos);
}
void
TopicI::unsubscribe(const string& id)
{
_subscribers->remove(id);
}
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