/data/refman/pasoursint/CMSSW_5_2_7_hltpatch2/src/GeneratorInterface/ThePEGInterface/src/Proxy.cc

Go to the documentation of this file.

#include <map>

#include <boost/thread.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/weak_ptr.hpp>

#include "GeneratorInterface/ThePEGInterface/interface/Proxy.h"

using namespace ThePEG;

static boost::mutex mutex;

typedef std::map<ProxyBase::ProxyID, boost::weak_ptr<ProxyBase> > ProxyMap;

static ProxyMap *getProxyMapInstance()
{
        static struct Sentinel {
                Sentinel() : instance(new ProxyMap) {}
                ~Sentinel() { delete instance; instance = 0; }

                ProxyMap        *instance;
        } sentinel;

        return sentinel.instance;
}

ProxyBase::ProxyBase(ProxyID id) :
        id(id)
{
}

ProxyBase::~ProxyBase()
{
        boost::mutex::scoped_lock scoped_lock(mutex);

        ProxyMap *map = getProxyMapInstance();
        if (map)
                map->erase(id);
}

boost::shared_ptr<ProxyBase> ProxyBase::create(ctor_t ctor)
{
        static ProxyBase::ProxyID nextProxyID = 0;

        boost::mutex::scoped_lock scoped_lock(mutex);

        boost::shared_ptr<ProxyBase> proxy(ctor(++nextProxyID));

        ProxyMap *map = getProxyMapInstance();
        if (map)
                map->insert(ProxyMap::value_type(proxy->getID(), proxy));

        return proxy;
}

boost::shared_ptr<ProxyBase> ProxyBase::find(ProxyID id)
{
        boost::mutex::scoped_lock scoped_lock(mutex);

        ProxyMap *map = getProxyMapInstance();
        if (!map)
                return boost::shared_ptr<ProxyBase>();

        ProxyMap::const_iterator pos = map->find(id);
        if (pos == map->end())
                return boost::shared_ptr<ProxyBase>();

        return boost::shared_ptr<ProxyBase>(pos->second);
}