client.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/Ice.h>
#include <IceUtil/IceUtil.h>
#include <IceGrid/Registry.h>
#include <Hello.h>

using namespace std;
using namespace Demo;

class SessionKeepAliveThread : public IceUtil::Thread, public IceUtil::Monitor<IceUtil::Mutex>
{
public:

    SessionKeepAliveThread(const IceGrid::SessionPrx& session, long timeout) :
        _session(session),
        _timeout(IceUtil::Time::seconds(timeout)),
        _destroy(false)
    {
    }

    virtual void
    run()
    {
        Lock sync(*this);
        while(!_destroy)
        {
            timedWait(_timeout);
            if(_destroy)
            {
                break;
            }
            try
            {
                _session->keepAlive();
            }
            catch(const Ice::Exception&)
            {
                break;
            }
        }
    }

    void
    destroy()
    {
        Lock sync(*this);
        _destroy = true;
        notify();
    }

private:

    const IceGrid::SessionPrx _session;
    const IceUtil::Time _timeout;
    bool _destroy;
};

typedef IceUtil::Handle<SessionKeepAliveThread> SessionKeepAliveThreadPtr;

class HelloClient : public Ice::Application
{
public:

    virtual int run(int, char*[]);
    virtual void interruptCallback(int);

private:

    void cleanup();
    void menu();
    string trim(const string&);

    IceUtil::Mutex _mutex;
    IceGrid::SessionPrx _session;
    SessionKeepAliveThreadPtr _keepAlive;
};

int
main(int argc, char* argv[])
{
    HelloClient app;
    return app.main(argc, argv, "config.client");
}

int
HelloClient::run(int argc, char* argv[])
{
    int status = EXIT_SUCCESS;

    //
    // Since this is an interactive demo we want the custom interrupt
    // callback to be called when the process is interrupted.
    //
    callbackOnInterrupt();

    IceGrid::RegistryPrx registry = IceGrid::RegistryPrx::checkedCast(
        communicator()->stringToProxy("DemoIceGrid/Registry"));
    if(!registry)
    {
        cerr << argv[0] << ": could not contact registry" << endl;
        return EXIT_FAILURE;
    }

    while(true)
    {
        cout << "This demo accepts any user-id / password combination.\n";

        string id;
        cout << "user id: " << flush;
        getline(cin, id);
        id = trim(id);

        string password;
        cout << "password: " << flush;
        getline(cin, password);
        password = trim(password);

        try
        {
            IceUtil::Mutex::Lock sync(_mutex);
            _session = registry->createSession(id, password);
            break;
        }
        catch(const IceGrid::PermissionDeniedException& ex)
        {
            cout << "permission denied:\n" << ex.reason << endl;
        }
    }

    {
        IceUtil::Mutex::Lock sync(_mutex);
        _keepAlive = new SessionKeepAliveThread(_session, registry->getSessionTimeout() / 2);
        _keepAlive->start();
    }

    try
    {
        //
        // First try to retrieve object by identity, which will work
        // if the application-single.xml descriptor is used. Otherwise
        // we retrieve object by type, which will succeed if the
        // application-multiple.xml descriptor is used.
        //
        HelloPrx hello;
        try
        {
            hello = HelloPrx::checkedCast(_session->allocateObjectById(communicator()->stringToIdentity("hello")));
        }
        catch(const IceGrid::ObjectNotRegisteredException&)
        {
            hello = HelloPrx::checkedCast(_session->allocateObjectByType("::Demo::Hello"));
        }
        
        menu();
        
        char c;
        do
        {
            try
            {
                cout << "==> ";
                cin >> c;
                if(c == 't')
                {
                    hello->sayHello();
                }
                else if(c == 's')
                {
                    hello->shutdown();
                }
                else if(c == 'x')
                {
                    // Nothing to do
                }
                else if(c == '?')
                {
                    menu();
                }
                else
                {
                    cout << "unknown command `" << c << "'" << endl;
                    menu();
                }
            }
            catch(const Ice::Exception& ex)
            {
                cerr << ex << endl;
            }
        }
        while(cin.good() && c != 'x');
    }
    catch(const IceGrid::AllocationException& ex)
    {
        cerr << argv[0] << ": could not allocate object: " << ex.reason << endl;
        status = EXIT_FAILURE;
    }
    catch(...)
    {
        cerr << "unexpected exception" << endl;
        status = EXIT_FAILURE;
    }

    cleanup();
    return status;
}

void
HelloClient::interruptCallback(int)
{
    cleanup();

    try
    {
        communicator()->destroy();
    }
    catch(const IceUtil::Exception& ex)
    {
        cerr << appName() << ": " << ex << endl;
    }
    catch(...)
    {
        cerr << appName() << ": unknown exception" << endl;
    }
    exit(EXIT_SUCCESS);
}

void
HelloClient::cleanup()
{
    IceUtil::Mutex::Lock sync(_mutex);
    //
    // Destroy the keepAlive thread and the sesion object otherwise
    // the session will be kept allocated until the timeout occurs.
    // Destroying the session will release all allocated objects.
    //
    if(_keepAlive)
    {
        _keepAlive->destroy();
        _keepAlive->getThreadControl().join();
        _keepAlive = 0;
    }
    if(_session)
    {
        _session->destroy();
        _session = 0;
    }
}

void
HelloClient::menu()
{
    cout <<
        "usage:\n"
        "t: send greeting\n"
        "s: shutdown server\n"
        "x: exit\n"
        "?: help\n";
}

string
HelloClient::trim(const string& s)
{
    static const string delims = "\t\r\n ";
    string::size_type last = s.find_last_not_of(delims);
    if(last != string::npos)
    {
        return s.substr(s.find_first_not_of(delims), last+1);
    }
    return s;
}