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condor_file_agent.h

/***************************************************************
 *
 * Copyright (C) 1990-2007, Condor Team, Computer Sciences Department,
 * University of Wisconsin-Madison, WI.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you
 * may not use this file except in compliance with the License.  You may
 * obtain a copy of the License at
 * 
 *    http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 ***************************************************************/


#ifndef CONDOR_FILE_AGENT_H
#define CONDOR_FILE_AGENT_H

#include "condor_file.h"

/**
This object takes an existing CondorFile and arranges for
the entire thing to be moved to a local temp file, where
it can be accessed quickly. When the file is closed, the
local copy is moved back to the original location.
<p>
The temp file is chosen by using tmpnam(), which generally
choose a file in /var/tmp.  A better place can and should
be chosen when Condor moves toward using a general-purpose
caching mechanism at each host.
*/

00038 class CondorFileAgent : public CondorFile {
public:
      CondorFileAgent( CondorFile *f );
      virtual ~CondorFileAgent();

      virtual int open( const char *url, int flags, int mode );
      virtual int close();
      virtual int read( int offset, char *data, int length );
      virtual int write( int offset, char *data, int length );

      virtual int fcntl( int cmd, int arg );
      virtual int ioctl( int cmd, long arg );
      virtual int ftruncate( size_t length ); 
      virtual int fsync();
      virtual int flush();
      virtual int fstat( struct stat *buf );

      virtual int is_readable();
      virtual int is_writeable();
      virtual int is_seekable();

      virtual int get_size();
      virtual char const      *get_url();

      virtual int get_unmapped_fd();
      virtual int is_file_local();

private:
      CondorFile *original;
      CondorFile *local_copy;
      char *local_url;
      char *url;
};

#endif




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