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BDBMetadataPlugin.h

/*
   Copyright (C) 2002 the Strongroom project

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   @author Ewald Snel
   @author Wouter de Vries
*/

#ifndef __BDBMETADATAPLUGIN_H
#define __BDBMETADATAPLUGIN_H

#include <pthread.h>
#include <db_cxx.h>

#include <MetadataPlugin.h>

    
class FastLock
{
public:
    FastLock() {}
    FastLock( pthread_t thread, int lockCount, int pending )
    : thread( thread ), lockCount( lockCount ), pending( pending ) {}

    pthread_t thread;
    int lockCount;
    int pending;
};


class BDBMetadataPlugin : public MetadataPlugin
{
public:
    BDBMetadataPlugin( const Config &cfg );
    ~BDBMetadataPlugin();

    bool init();

    CoreError create( NumID &docid, const Document &document );
    CoreError remove( NumID docid );
    CoreError update( NumID docid, const Document &document );
    CoreError get( NumID docid, Document &document );
    CoreError lock( NumID docid, DocumentLock lock );
    CoreError getLocks( map<NumID,DocumentLock> &locks );
    CoreError query( NumID first, int maxlen, map<NumID,NumID> &updates );

private:
    void fastLock( NumID docid );

    bool fastUnlock( NumID docid );

    bool fastTestLock( NumID docid );

    bool checkSysKeyOrSetDefault( const char *syskey, NumID defaultValue );
    bool increaseSysKey( DbTxn *txn, const char *syskey, NumID &value );
    bool getSyskey( DbTxn *mothertxn, const char *syskey, NumID &value );

    bool _initialized;
    
    DbEnv *dbEnvHandle;
    Db *docTableHandle;
    Db *updTableHandle;
    Db *lockTableHandle;
    Db *sysTableHandle;
    
    pthread_mutex_t mutex;
    pthread_cond_t cond;
    hash_map<NumID,FastLock,_hash_NumID> fastLocks;

    char* key_highest_docid;
    char* key_highest_updid;
    char* dbFilename;
};

#endif

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