/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/Utilities/DCacheAdaptor/plugins/DCacheStorageMaker.cc

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#include "Utilities/StorageFactory/interface/StorageMaker.h"
#include "Utilities/StorageFactory/interface/StorageMakerFactory.h"
#include "Utilities/StorageFactory/interface/StorageFactory.h"
#include "Utilities/DCacheAdaptor/interface/DCacheFile.h"
#include "FWCore/Utilities/interface/Exception.h"
#include <unistd.h>
#include <dcap.h>

class DCacheStorageMaker : public StorageMaker
{
  static std::string normalise (const std::string &proto, const std::string &path)
  {
    size_t p = path.find("/pnfs");
    if (p < 3)
      return (proto == "gsidcap") ? proto + ':' + path.substr(p) : path.substr(p);

    // remove multiple "/"
    p = path.find_first_not_of('/');

    // it's url, return the full thing
    return proto + "://" + path.substr(p);
  }

public:

  virtual Storage *open (const std::string &proto,
                         const std::string &path,
                         int mode)
  {
    StorageFactory *f = StorageFactory::get();
    StorageFactory::ReadHint readHint = f->readHint();
    StorageFactory::CacheHint cacheHint = f->cacheHint();

    if (readHint != StorageFactory::READ_HINT_UNBUFFERED
        || cacheHint == StorageFactory::CACHE_HINT_STORAGE)
      mode &= ~IOFlags::OpenUnbuffered;
    else
      mode |= IOFlags::OpenUnbuffered;

    Storage *file = new DCacheFile(normalise(proto, path), mode);
    return f->wrapNonLocalFile(file, proto, std::string(), mode);
  }

  virtual void stagein (const std::string &proto,
                        const std::string &path)
  {
    std::string npath = normalise(proto, path);
    if (dc_stage(npath.c_str(), 0, 0) != 0) {
      cms::Exception ex("FileStageInError");
      ex << "Cannot stage in file '" << npath
         << "', error was: " << dc_strerror(dc_errno)
         << " (dc_errno=" << dc_errno << ")";
      ex.addContext("Calling DCacheStorageMaker::stagein()");
      throw ex;
    }
  }

  virtual bool check (const std::string &proto,
                      const std::string &path,
                      IOOffset *size = 0)
  {
    std::string testpath (normalise (proto, path));
    if (dc_access (testpath.c_str (), R_OK) != 0)
      return false;

    if (size)
    {
      struct stat64 buf;
      if (dc_stat64 (testpath.c_str (), &buf) != 0)
        return false;
        
      *size = buf.st_size;
    }

    return true;
  }

  virtual void setTimeout(unsigned int timeout) {
    if (timeout != 0) dc_setOpenTimeout(timeout);
  }
};

DEFINE_EDM_PLUGIN (StorageMakerFactory, DCacheStorageMaker, "dcache");
DEFINE_EDM_PLUGIN (StorageMakerFactory, DCacheStorageMaker, "dcap");
DEFINE_EDM_PLUGIN (StorageMakerFactory, DCacheStorageMaker, "gsidcap");