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indexfile.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.
 *
 ***************************************************************/


#include <fcntl.h>
#include <stdio.h>
#include <string>
#include <map>
#include "classad/classad_stl.h"
#include <sys/types.h>

BEGIN_NAMESPACE( classad )

typedef struct{
      int offset;
} tag; 

struct eqstr
{
      bool operator()(const char* s1, const char* s2) const
      {
            return strcmp(s1, s2) == 0;
      }
};

class IndexFile {
 public:
      void Init(int file_handler);
      bool FindInFile(std::string key,tag &offset);
      /** the cache in mem is full, so we write one classad back to file
            and wri
            @param s_id  the pointer to the ID
      */
      bool UpdateIndex(std::string key);
      bool WriteBack(std::string key, std::string ad);  
      //should delete it from file and index
      bool DeleteFromStorageFile(std::string key);
      bool UpdateIndex(std::string key, int offset);
      int First(std::string &key);
      int Next(std::string &key);
      std::string GetClassadFromFile(std::string key, int offset);
      bool  TruncateStorageFile();
      int  dump_index();
 private:
      classad_hash_map<std::string,int,StringHash> Index;
      classad_hash_map<std::string,int,StringHash>::iterator index_itr;
      int filed;
};

END_NAMESPACE

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