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// **********************************************************************
//
// Copyright (c) 2003-2008 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 <IceUtil/IceUtil.h>
#include <Ice/Ice.h>
#include <IceStorm/IceStorm.h>
#include <IceGrid/Query.h>
#include <Clock.h>
#include <set>
using namespace std;
using namespace Demo;
class InstanceCheckThread : public IceUtil::Thread, public IceUtil::Monitor<IceUtil::Mutex>
{
public:
InstanceCheckThread(const IceGrid::QueryPrx& query, const string& topicName, const Ice::ObjectPrx& clock,
const Ice::ObjectPrx& managerReplica, const set<IceStorm::TopicManagerPrx>& managers,
const Ice::ObjectPrx& topicReplica, const set<IceStorm::TopicPrx>& topics) :
_query(query),
_topicName(topicName),
_clock(clock),
_managerReplica(managerReplica),
_managers(managers),
_topicReplica(topicReplica),
_topics(topics),
_timeout(IceUtil::Time::seconds(10)),
_terminated(false)
{
}
virtual void
run()
{
Lock sync(*this);
while(!_terminated)
{
timedWait(_timeout);
if(!_terminated)
{
try
{
//
// Check if there are any new topic managers in the replicas list.
//
Ice::ObjectProxySeq managers = _query->findAllReplicas(_managerReplica);
Ice::ObjectProxySeq::const_iterator p;
for(p = managers.begin(); p != managers.end(); ++p)
{
IceStorm::TopicManagerPrx manager = IceStorm::TopicManagerPrx::uncheckedCast(*p);
if(_managers.find(manager) == _managers.end())
{
//
// Create the topic on the new topic manager if it does
// not already exist.
//
try
{
manager->retrieve(_topicName);
}
catch(const IceStorm::NoSuchTopic&)
{
manager->create(_topicName);
}
//
// Since the topic proxy returned by the retrieval/creation
// is a replicated proxy we cannot use it to subscribe to the
// new instance. Instead we have to retrive all the topics and
// find the new one.
//
Ice::ObjectProxySeq topics = _query->findAllReplicas(_topicReplica);
Ice::ObjectProxySeq::const_iterator q;
for(q = topics.begin(); q != topics.end(); ++q)
{
IceStorm::TopicPrx topic = IceStorm::TopicPrx::uncheckedCast(*q);;
if(_topics.find(topic) == _topics.end())
{
try
{
topic->subscribeAndGetPublisher(IceStorm::QoS(), _clock);
}
catch(const IceStorm::AlreadySubscribed&)
{
// Ignore
}
_topics.insert(topic);
_managers.insert(manager);
break;
}
}
}
}
}
catch(const Ice::Exception& ex)
{
cerr << "warning: exception while checking for new IceStorm instances: " << ex << endl;
}
}
}
}
void
terminate()
{
Lock sync(*this);
_terminated = true;
notify();
}
private:
const IceGrid::QueryPrx _query;
const string _topicName;
const Ice::ObjectPrx _clock;
const Ice::ObjectPrx _managerReplica;
set<IceStorm::TopicManagerPrx> _managers;
const Ice::ObjectPrx _topicReplica;
set<IceStorm::TopicPrx> _topics;
const IceUtil::Time _timeout;
bool _terminated;
};
typedef IceUtil::Handle<InstanceCheckThread> InstanceCheckThreadPtr;
class ClockI : public Clock
{
public:
virtual void
tick(const string& time, const Ice::Current&)
{
cout << time << endl;
}
};
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.sub");
}
int
Subscriber::run(int argc, char* argv[])
{
if(argc > 2)
{
cerr << appName() << ": too many arguments" << endl;
return EXIT_FAILURE;
}
Ice::PropertiesPtr properties = communicator()->getProperties();
IceGrid::QueryPrx query = IceGrid::QueryPrx::uncheckedCast(communicator()->stringToProxy("DemoIceGrid/Query"));
Ice::ObjectPrx managerReplica = communicator()->stringToProxy("DemoIceStorm/TopicManager");
Ice::ObjectProxySeq objSeq = query->findAllReplicas(managerReplica);
if(objSeq.size() == 0)
{
cerr << appName() << ": no topic managers found, make sure application was deployed." << endl;
return EXIT_FAILURE;
}
string topicName = "time";
if(argc != 1)
{
topicName = argv[1];
}
//
// Create the servant to receive the events.
//
Ice::ObjectAdapterPtr adapter = communicator()->createObjectAdapter("Clock.Subscriber");
//
// We want to use oneway batch messages.
//
Ice::ObjectPrx clock = adapter->addWithUUID(new ClockI)->ice_batchOneway();
//
// Get all the topic managers and create the topic if necessary.
//
IceStorm::TopicPrx topicReplica;
set<IceStorm::TopicManagerPrx> managers;
Ice::ObjectProxySeq::const_iterator p;
for(p = objSeq.begin(); p != objSeq.end(); ++p)
{
IceStorm::TopicManagerPrx manager = IceStorm::TopicManagerPrx::checkedCast(*p);
managers.insert(manager);
try
{
topicReplica = manager->retrieve(topicName);
}
catch(const IceStorm::NoSuchTopic&)
{
try
{
topicReplica = manager->create(topicName);
}
catch(const IceStorm::TopicExists&)
{
cerr << appName() << ": temporary failure. try again." << endl;
return EXIT_FAILURE;
}
}
}
//
// Get all the topics and subscribe. We can't use the proxies returned by
// the topic creation above because they are repicated proxies, and not
// specific proxies for each individual topic.
//
IceStorm::TopicPrx topic;
objSeq = query->findAllReplicas(topicReplica);
set<IceStorm::TopicPrx> topics;
for(p = objSeq.begin(); p != objSeq.end(); ++p)
{
topic = IceStorm::TopicPrx::uncheckedCast(*p);
topic->subscribeAndGetPublisher(IceStorm::QoS(), clock);
topics.insert(topic);
}
//
// Create and start thread to check for new IceStorm instances coming online.
//
InstanceCheckThreadPtr instanceCheck =
new InstanceCheckThread(query, topicName, clock, managerReplica, managers, topicReplica, topics);
instanceCheck->start();
adapter->activate();
shutdownOnInterrupt();
communicator()->waitForShutdown();
instanceCheck->terminate();
instanceCheck->getThreadControl().join();
//
// Unsubscribe from all topics.
//
objSeq = query->findAllReplicas(topicReplica);
for(p = objSeq.begin(); p != objSeq.end(); ++p)
{
topic = IceStorm::TopicPrx::uncheckedCast(*p);
topic->unsubscribe(clock);
}
return EXIT_SUCCESS;
}
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