channelProviderLocal.cpp

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/* channelProviderLocal.cpp */
#include <epicsThread.h>
#include <pv/serverContext.h>
#include <pv/syncChannelFind.h>
#include <pv/pvTimeStamp.h>
#include <pv/rpcService.h>
#include <pv/timeStamp.h>

#define epicsExportSharedSymbols
#include "pv/pvStructureCopy.h"
#include "pv/pvDatabase.h"
#include "pv/channelProviderLocal.h"

using namespace epics::pvData;
using namespace epics::pvAccess;
using namespace epics::pvCopy;
using std::tr1::static_pointer_cast;
using std::tr1::dynamic_pointer_cast;
using std::cout;
using std::endl;
using std::string;

namespace epics { namespace pvDatabase {

static string providerName("local");
static ChannelProviderLocalPtr channelProvider;

class LocalChannelProviderFactory : public ChannelProviderFactory
{
public:
    POINTER_DEFINITIONS(LocalChannelProviderFactory);
    virtual string getFactoryName() { return providerName;}
    virtual  ChannelProvider::shared_pointer sharedInstance()
    {
        if(!channelProvider) channelProvider = ChannelProviderLocalPtr(new ChannelProviderLocal());
        return channelProvider;
    }
    virtual  ChannelProvider::shared_pointer newInstance()
    {
        throw std::logic_error(
            "LocalChannelProviderFactory::newInstance() not Implemented");
    }
};


ChannelProviderLocalPtr getChannelProviderLocal()
{
    static int firstTime = 1;
    if (firstTime) {
        firstTime = 0;
        ChannelProviderFactory::shared_pointer factory(
             new  LocalChannelProviderFactory());
         ChannelProviderRegistry::servers()->add(factory);
    }
    ChannelProvider::shared_pointer channelProvider =
        ChannelProviderRegistry::servers()->getProvider(providerName);
    return std::tr1::dynamic_pointer_cast<ChannelProviderLocal>(channelProvider);
}

ChannelProviderLocal::ChannelProviderLocal()
: pvDatabase(PVDatabase::getMaster()),
  traceLevel(0)
{
    if(traceLevel>0) {
        cout << "ChannelProviderLocal::ChannelProviderLocal()\n";
    }
}

ChannelProviderLocal::~ChannelProviderLocal()
{
    if(traceLevel>0) {
        cout << "ChannelProviderLocal::~ChannelProviderLocal()\n";
    }
}

std::tr1::shared_ptr<ChannelProvider> ChannelProviderLocal::getChannelProvider()
{
    return shared_from_this();
}

string ChannelProviderLocal::getProviderName()
{
    return providerName;
}

ChannelFind::shared_pointer ChannelProviderLocal::channelFind(
    string const & channelName,
    ChannelFindRequester::shared_pointer  const &channelFindRequester)
{
    if(traceLevel>1) {
        cout << "ChannelProviderLocal::channelFind " << "channelName" << endl;
    }
    PVDatabasePtr pvdb(pvDatabase.lock());
    if(!pvdb) {
        Status notFoundStatus(Status::STATUSTYPE_ERROR,"pvDatabase was deleted");
        channelFindRequester->channelFindResult(
            notFoundStatus,
            shared_from_this(),
            false);
    }
    PVRecordPtr pvRecord = pvdb->findRecord(channelName);
    if(pvRecord) {
        channelFindRequester->channelFindResult(
            Status::Ok,
            shared_from_this(),
            true);

    } else {
        Status notFoundStatus(Status::STATUSTYPE_ERROR,"pv not found");
        channelFindRequester->channelFindResult(
            notFoundStatus,
            shared_from_this(),
            false);
    }
    return shared_from_this();
}

ChannelFind::shared_pointer ChannelProviderLocal::channelList(
    ChannelListRequester::shared_pointer const & channelListRequester)
{
    if(traceLevel>1) {
        cout << "ChannelProviderLocal::channelList\n";
    }
    PVDatabasePtr pvdb(pvDatabase.lock());
    if(!pvdb)throw std::logic_error("pvDatabase was deleted");
    PVStringArrayPtr records(pvdb->getRecordNames());
    channelListRequester->channelListResult(
        Status::Ok, shared_from_this(), records->view(), false);
    return shared_from_this();
}

Channel::shared_pointer ChannelProviderLocal::createChannel(
    string const & channelName,
    ChannelRequester::shared_pointer  const &channelRequester,
    short priority)
{
    if(traceLevel>1) {
        cout << "ChannelProviderLocal::createChannel " << "channelName" << endl;
    }
    ChannelLocalPtr channel;
    Status status = Status::Ok;
    PVDatabasePtr pvdb(pvDatabase.lock());
    if(!pvdb) {
        status = Status::error("pvDatabase was deleted");
    } else {
        PVRecordPtr pvRecord = pvdb->findRecord(channelName);
        if(pvRecord) {
            channel = ChannelLocalPtr(new ChannelLocal(
                shared_from_this(),channelRequester,pvRecord));
            pvRecord->addPVRecordClient(channel);
       } else {
            status = Status::error("pv not found");
       }
    }
    channelRequester->channelCreated(status,channel);
    return channel;
}

Channel::shared_pointer ChannelProviderLocal::createChannel(
    string const & channelName,
    ChannelRequester::shared_pointer  const &channelRequester,
    short priority,
    string const &address)
{
    if(!address.empty()) throw std::invalid_argument("address not allowed for local implementation");
    return createChannel(channelName, channelRequester, priority);
}

}}