subscriber.cpp

ICE-3.2 一个开源的中间件

// **********************************************************************
//
// Copyright (c) 2003-2007 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 <Ice/Application.h>
#include <IceStorm/IceStorm.h>
#include <IceGrid/Query.h>
#include <IceUtil/UUID.h>

#include <Clock.h>

#include <map>

using namespace std;
using namespace Demo;

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[])
{
    Ice::PropertiesPtr properties = communicator()->getProperties();

    IceGrid::QueryPrx query = IceGrid::QueryPrx::uncheckedCast(communicator()->stringToProxy("DemoIceGrid/Query"));
    Ice::ObjectProxySeq managers = query->findAllReplicas(query->findObjectByType("::IceStorm::TopicManager"));
    if(managers.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();

    IceStorm::TopicPrx topic;
    Ice::ObjectProxySeq::const_iterator p;
    for(p = managers.begin(); p != managers.end(); ++p)
    {
        //
        // Add a Servant for the Ice Object.
        //
        IceStorm::TopicManagerPrx manager = IceStorm::TopicManagerPrx::checkedCast(*p);

        try
        {
            topic = manager->retrieve(topicName);
        }
        catch(const IceStorm::NoSuchTopic&)
        {
            try
            {
                topic = manager->create(topicName);
            }
            catch(const IceStorm::TopicExists&)
            {
                cerr << appName() << ": temporary failure. try again." << endl;
                return EXIT_FAILURE;
            }
        }
    }

    Ice::ObjectProxySeq topics = query->findAllReplicas(topic);
    for(p = topics.begin(); p != topics.end(); ++p)
    {
        topic = IceStorm::TopicPrx::uncheckedCast(*p);
        topic->subscribeAndGetPublisher(IceStorm::QoS(), clock);
    }

    adapter->activate();
    shutdownOnInterrupt();
    communicator()->waitForShutdown();

    //
    // Unsubscribe all subscribed objects.
    //
    for(p = topics.begin(); p != topics.end(); ++p)
    {
        topic = IceStorm::TopicPrx::uncheckedCast(*p);
        topic->unsubscribe(clock);
    }

    return EXIT_SUCCESS;
}