server.cpp

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// server.cpp,v 1.3 2002/01/06 15:48:40 schmidt Exp

// ============================================================================
//
// = LIBRARY
//    TAO/examples/Advanced/ch_8_and_10
//
// = FILENAME
//    server.cpp
//
// = AUTHORS
//   Source code used in TAO has been modified and adapted from the code
//   provided in the book, "Advanced CORBA Programming with C++" by Michi
//   Henning and Steve Vinoski. Copyright 1999. Addison-Wesley, Reading,
//   MA.
//
//   Modified for TAO by Mike Moran <[e-mail]>
//
// ============================================================================

#include    "server.h"
#include    <algorithm>
#include    "icp.h"
//#include    <iostream.h>
//#include    <assert.h>
//----------------------------------------------------------------


// Generic ostream inserter for exceptions. Inserts the exception
// name, if available, and the repository ID otherwise.

#if 0    //This inserter may or may not be needed for your ORB.

static ostream &
operator<<(ostream & os, const CORBA::Exception & e)
{
    CORBA::Any tmp;
    tmp <<= e;
    CORBA::TypeCode_var tc = tmp.type();
    const char * p = tc->name();
    if (*p != '\0')
        os << p;
    else
        os << tc->id();
    return os;
}

#endif

//----------------------------------------------------------------

Controller_impl * Thermometer_impl::m_ctrl; // static member

// Helper function to read the model string from a device.

CCS::ModelType
Thermometer_impl::
get_model()
{
    char buf[32];
    assert(ICP_get(m_anum, "model", buf, sizeof(buf)) == 0);
    return CORBA::string_dup(buf);
}

// Helper function to read the temperature from a device.

CCS::TempType
Thermometer_impl::
get_temp()
{
    short temp;
    assert(
        ICP_get(m_anum, "temperature", &temp, sizeof(temp)
    ) == 0);
    return temp;
}

// Helper function to read the location from a device.

CCS::LocType
Thermometer_impl::
get_loc()
{
    char buf[32];
    assert(ICP_get(m_anum, "location", buf, sizeof(buf)) == 0);
    return CORBA::string_dup(buf);
}

// Helper function to set the location of a device.

void
Thermometer_impl::
set_loc(const char * loc)
{
    assert(ICP_set(m_anum, "location", loc) == 0);
}

// Constructor.

Thermometer_impl::
Thermometer_impl(
    CCS::AssetType      anum,
    const char *        location
) : m_anum(anum)
{
    assert(ICP_online(anum) == 0);  // Mark device as on-line
    set_loc(location);
    m_ctrl->add_impl(anum, this);   // Add self to controller's map
}

// Destructor.

Thermometer_impl::
~Thermometer_impl()
{
    try {
        m_ctrl->remove_impl(m_anum); // Remove self from map
        ICP_offline(m_anum);         // Mark device as off-line
    }
    catch (...) {
        assert(0);      // Prevent exceptions from escaping
    }
}

// IDL model attribute.

CCS::ModelType
Thermometer_impl::
model() throw(CORBA::SystemException)
{
    return get_model();
}

// IDL asset_num attribute.

CCS::AssetType
Thermometer_impl::
asset_num() throw(CORBA::SystemException)
{
    return m_anum;
}

// IDL temperature attribute.

CCS::TempType
Thermometer_impl::
temperature() throw(CORBA::SystemException)
{
    return get_temp();
}

// IDL location attribute accessor.

CCS::LocType
Thermometer_impl::
location() throw(CORBA::SystemException)
{
    return get_loc();
}

// IDL location attribute modifier.

void
Thermometer_impl::
location(const char * loc) throw(CORBA::SystemException)
{
    set_loc(loc);
}
    
//----------------------------------------------------------------

// Helper function to get a thermostat's nominal temperature.

CCS::TempType
Thermostat_impl::
get_nominal_temp()
{
    short temp;
    assert(
        ICP_get(m_anum, "nominal_temp", &temp, sizeof(temp)
    ) == 0);
    return temp;
}

// Helper function to set a thermostat's nominal temperature.

CCS::TempType
Thermostat_impl::
set_nominal_temp(CCS::TempType new_temp)
throw(CCS::Thermostat::BadTemp)
{
    short old_temp;

    // We need to return the previous nominal temperature,
    // so we first read the current nominal temperature before
    // changing it.
    assert(ICP_get(
                m_anum, "nominal_temp",
                &old_temp, sizeof(old_temp)
           ) == 0
    );
    
    // Now set the nominal temperature to the new value.
    if (ICP_set(m_anum, "nominal_temp", &new_temp) != 0) {

        // If ICP_set() failed, read this thermostat's minimum
        // and maximum so we can initialize the BadTemp exception.
        CCS::Thermostat::BtData btd;
        ICP_get(
            m_anum, "MIN_TEMP",
            &btd.min_permitted, sizeof(btd.min_permitted)
        );
        ICP_get(
            m_anum, "MAX_TEMP",
            &btd.max_permitted, sizeof(btd.max_permitted)
        );
        btd.requested = new_temp;
        btd.error_msg = CORBA::string_dup(
            new_temp > btd.max_permitted ? "Too hot" : "Too cold"
        );
        throw CCS::Thermostat::BadTemp(btd);
    }
    return old_temp;
}

// Constructor.

Thermostat_impl::
Thermostat_impl(
    CCS::AssetType      anum,
    const char *        location,
    CCS::TempType       nominal_temp
) : Thermometer_impl(anum, location)
{
    // Base Thermometer_impl constructor does most of the
    // work, so we need only set the nominal temperature here.
    set_nominal_temp(nominal_temp);
}

// IDL get_nominal operation.

CCS::TempType
Thermostat_impl::
get_nominal() throw(CORBA::SystemException)
{
    return get_nominal_temp();
}

// IDL set_nominal operation.

CCS::TempType
Thermostat_impl::
set_nominal(CCS::TempType new_temp)
throw(CORBA::SystemException, CCS::Thermostat::BadTemp)
{
    return set_nominal_temp(new_temp);
}

//----------------------------------------------------------------

// Helper function for thermometers and thermostats to
// add themselves to the m_assets map.

void
Controller_impl::
add_impl(CCS::AssetType anum, Thermometer_impl * tip)
{
    m_assets[anum] = tip;
}

// Helper function for thermometers and thermostats to
// remove themselves from the m_assets map.

void
Controller_impl::
remove_impl(CCS::AssetType anum)
{
    m_assets.erase(anum);
}

// IDL list operation.

CCS::Controller::ThermometerSeq *
Controller_impl::
list() throw(CORBA::SystemException)
{
    // Create a new thermometer sequence. Because we know
    // the number of elements we will put onto the sequence,
    // we use the maximum constructor.
    CCS::Controller::ThermometerSeq_var listv
        = new CCS::Controller::ThermometerSeq(m_assets.size());
    listv->length(m_assets.size());

    // Loop over the m_assets map and create a
    // reference for each device.
    CORBA::ULong count = 0;
    AssetMap::iterator i;
    for (i = m_assets.begin(); i != m_assets.end(); i++)
        listv[count++] = i->second->_this();
    return listv._retn();
}

// IDL change operation.

void
Controller_impl::
change(
    const CCS::Controller::ThermostatSeq &  tlist,
    CORBA::Short                            delta
) throw(CORBA::SystemException, CCS::Controller::EChange)
{
    CCS::Controller::EChange ec;    // Just in case we need it

    // We cannot add a delta value to a thermostat's temperature
    // directly, so for each thermostat, we read the nominal
    // temperature, add the delta value to it, and write
    // it back again.
    for (CORBA::ULong i = 0; i < tlist.length(); i++) {
        if (CORBA::is_nil(tlist[i]))
            continue;                       // Skip nil references

        // Read nominal temp and update it.
        CCS::TempType tnom = tlist[i]->get_nominal();
        tnom += delta;
        try {
            tlist[i]->set_nominal(tnom);
        }
        catch (const CCS::Thermostat::BadTemp & bt) {
            // If the update failed because the temperature
            // is out of range, we add the thermostat's info
            // to the errors sequence.
            CORBA::ULong len = ec.errors.length();
            ec.errors.length(len + 1);
            ec.errors[len].tmstat_ref = tlist[i].in ();
            ec.errors[len].info = bt.details;
        }
    }

    // If we encountered errors in the above loop,
    // we will have added elements to the errors sequence.
    if (ec.errors.length() != 0)
        throw ec;
}

// IDL find operation

void
Controller_impl::
find(CCS::Controller::SearchSeq & slist)
throw(CORBA::SystemException)
{
    // Loop over input list and look up each device.
    CORBA::ULong listlen = slist.length();
    for (CORBA::ULong i = 0; i < listlen; i++) {

        AssetMap::iterator where;   // Iterator for asset map
        int num_found = 0;          // Num matched per iteration

        // Assume we will not find a matching device.
        slist[i].device = CCS::Thermometer::_nil();

        // Work out whether we are searching by asset,
        // model, or location.
        CCS::Controller::SearchCriterion sc = slist[i].key._d();
        if (sc == CCS::Controller::ASSET) {
            // Search for matching asset number.
            where = m_assets.find(slist[i].key.asset_num());
            if (where != m_assets.end())
                slist[i].device = where->second->_this();
        } else {
            // Search for model or location string.
            const char * search_str;
            if (sc == CCS::Controller::LOCATION)
                search_str = slist[i].key.loc();
            else
                search_str = slist[i].key.model_desc();

            // Find first matching device (if any).
            where = find_if(
                        m_assets.begin(), m_assets.end(),
                        StrFinder(sc, search_str)
                    );
            
            // While there are matches...
            while (where != m_assets.end()) {
                if (num_found == 0) {
                    // First match overwrites reference
                    // in search record.
                    slist[i].device = where->second->_this();
                } else {
                    // Each further match appends a new
                    // element to the search sequence.
                    CORBA::ULong len = slist.length();
                    slist.length(len + 1);
                    slist[len].key = slist[i].key;
                    slist[len].device = where->second->_this();
                }
                num_found++;

                // Find next matching device with this key.
                where = find_if(
                            ++where, m_assets.end(),
                            StrFinder(sc, search_str)
                        );
            }
        }
    }
    cerr << "end" << endl;
}

//----------------------------------------------------------------

int
main(int argc, char * argv[])
{
    try {
        // Initialize orb
        CORBA::ORB_var orb = CORBA::ORB_init(argc, argv);

        // Get reference to Root POA.
        CORBA::Object_var obj
            = orb->resolve_initial_references("RootPOA");
        PortableServer::POA_var poa
            = PortableServer::POA::_narrow(obj.in());

        // Activate POA manager
        PortableServer::POAManager_var mgr
            = poa->the_POAManager();
        mgr->activate();

        // Create a controller and set static m_ctrl member
        // for thermostats and thermometers.
        Controller_impl ctrl_servant;
        Thermometer_impl::m_ctrl = &ctrl_servant;

        // Write controller stringified reference to stdout
        CCS::Controller_var ctrl = ctrl_servant._this();
        CORBA::String_var str = orb->object_to_string(ctrl.in());
        cout << str.in() << endl << endl;

        // Create a few devices. (Thermometers have odd asset
        // numbers, thermostats have even asset numbers.)
        Thermometer_impl thermo1(2029, "Deep Thought");
        Thermometer_impl thermo2(8053, "HAL");
        Thermometer_impl thermo3(1027, "ENIAC");

        Thermostat_impl tmstat1(3032, "Colossus", 68);
        Thermostat_impl tmstat2(4026, "ENIAC", 60);
        Thermostat_impl tmstat3(4088, "ENIAC", 50);
        Thermostat_impl tmstat4(8042, "HAL", 40);

        // Accept requests
        orb->run();
    }
    catch (const CORBA::Exception & e) {
        cerr << "Uncaught CORBA exception: " << e << endl;
        return 1;
    }
    catch (...) {
        assert(0);  // Unexpected exception, dump core
    }
    return 0;
}