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// **********************************************************************
//
// Copyright (c) 2003
// ZeroC, Inc.
// Billerica, MA, USA
//
// All Rights Reserved.
//
// Ice is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License version 2 as published by
// the Free Software Foundation.
//
// **********************************************************************
#include <Ice/Application.h>
#include <IceStorm/IceStorm.h>
#include <IceUtil/UUID.h>
#include <ClockI.h>
#include <list>
using namespace std;
class Subscriber : public Ice::Application
{
public:
virtual int run(int, char*[]);
};
int
main(int argc, char* argv[])
{
Subscriber app;
return app.main(argc, argv, "config");
}
int
Subscriber::run(int argc, char* argv[])
{
Ice::PropertiesPtr properties = communicator()->getProperties();
const string proxyProperty = "IceStorm.TopicManager.Proxy";
string proxy = properties->getProperty(proxyProperty);
if(proxy.empty())
{
cerr << appName() << ": property `" << proxyProperty << "' not set" << endl;
return EXIT_FAILURE;
}
Ice::ObjectPrx base = communicator()->stringToProxy(proxy);
IceStorm::TopicManagerPrx manager = IceStorm::TopicManagerPrx::checkedCast(base);
if(!manager)
{
cerr << appName() << ": invalid proxy" << endl;
return EXIT_FAILURE;
}
//
// Gather the set of topics to which to subscribe. It is either
// the set provided on the command line, or the topic "time".
//
Ice::StringSeq topics;
if(argc > 1)
{
for(int i = 1; i < argc; ++i)
{
topics.push_back(argv[i]);
}
}
else
{
topics.push_back("time");
}
//
// Set the requested quality of service "reliability" =
// "batch". This tells IceStorm to send events to the subscriber
// in batches at regular intervals.
//
IceStorm::QoS qos;
qos["reliability"] = "batch";
//
// Create the servant to receive the events.
//
Ice::ObjectAdapterPtr adapter = communicator()->createObjectAdapter("Clock.Subscriber");
Ice::ObjectPtr clock = new ClockI();
//
// Create a UUID to use in the name field of the the object
// identity. The same UUID can be used for the identity of each
// Subscriber object since the category field will differ.
//
string uuid = IceUtil::generateUUID();
//
// List of all subscribers.
//
list<Ice::ObjectPrx> subscribers;
//
// Add the servant to the adapter for the given
// topics. Alternatively a ServantLocator could have been used for
// the same purpose.
//
for(Ice::StringSeq::iterator p = topics.begin(); p != topics.end(); ++p)
{
//
// The category is the name of the topic.
//
Ice::Identity ident;
ident.category = *p;
ident.name = uuid;
//
// Add a Servant for the Ice Object.
//
Ice::ObjectPrx object = adapter->add(clock, ident);
try
{
manager->subscribe(qos, object);
}
catch(const IceStorm::NoSuchTopic& e)
{
cerr << appName() << ": " << e << " name: " << e.name << endl;
break;
}
//
// Add to the set of subscribers _after_ subscribing. This
// ensures that only subscribed subscribers are unsubscribed
// in the case of an error.
//
subscribers.push_back(object);
}
//
// Unless there is a subscriber per topic then there was some
// problem. If there was an error the application should terminate
// without accepting any events.
//
if(subscribers.size() == topics.size())
{
adapter->activate();
communicator()->waitForShutdown();
}
//
// Unsubscribe all subscribed objects.
//
for(list<Ice::ObjectPrx>::const_iterator q = subscribers.begin(); q != subscribers.end(); ++q)
{
try
{
manager->unsubscribe(*q);
}
catch(const IceStorm::NoSuchTopic& e)
{
cerr << appName() << ": " << e << " name: " << e.name << endl;
}
}
return EXIT_SUCCESS;
}
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