transaction.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 __CLASSAD_TRANSACTION_H__
#define __CLASSAD_TRANSACTION_H__

#include <list>
#include <string>
#include "classad/sink.h"
#include "classad/view.h"

class Sock;

BEGIN_NAMESPACE( classad )

class ClassAd;
class ClassAdCollection;
    
class XactionRecord {
public:
    XactionRecord( ) { op = -1; key = ""; rec = 0; }
    bool operator==( const XactionRecord & ) const { return false; }
    bool operator< ( const XactionRecord & ) const { return false; }

    int     op;
    std::string key;
    ClassAd *rec;
    ClassAd *backup;
};

typedef std::list<XactionRecord> CollectionOpList;

class ServerTransaction {
public:
    ServerTransaction( );
    ~ServerTransaction( );

    inline void SetCollectionServer( ClassAdCollection *c ) { server=c; }
    inline void GetCollectionServer( ClassAdCollection *&c ){ c=server; } 
    inline void SetXactionName( const std::string &n ) { xactionName = n; }
    inline void GetXactionName(std::string &n ) const { n = xactionName; }
    inline void SetLocalXaction( bool l ) { local = l; }
    inline bool GetLocalXaction( ) const { return( local ); }

    void ClearRecords( );
    void AppendRecord( int, const std::string &, ClassAd * );
    bool Commit( );
    bool Log( FILE *fp, ClassAdUnParser *unp );
    ClassAd *ExtractErrorCause( );

    enum { ABSENT, ACTIVE, COMMITTED };

private:
    std::string             xactionName;
    bool                    local;
    ClassAdCollection       *server;
    CollectionOpList        opList;

    int                     xactionErrno;
    std::string             xactionErrMsg;
    ClassAd                 *xactionErrCause;
};


class ClientTransaction {
public:
    ClientTransaction( );
    ~ClientTransaction( );

    inline void SetServerAddr( const std::string &a, int p ) { addr=a; port=p; }
    inline void GetServerAddr( std::string &a, int &p ) const { a=addr; p=port; }
    inline void SetXactionName( const std::string &n ) { xactionName = n; }
    inline void GetXactionName( std::string &n ) const { n = xactionName; }
    inline void SetXactionState( char s ) { state = s; }
    inline char GetXactionState( ) const { return( state ); }

    bool LogCommit( FILE *, ClassAdUnParser *unp );
    bool LogAckCommit( FILE *, ClassAdUnParser *unp );
    bool LogAbort( FILE *, ClassAdUnParser *unp );

    enum { ACTIVE, PENDING };

private:
    std::string xactionName, addr;
    int     port;
    char    state;
};


END_NAMESPACE

#endif /* __CLASSAD_TRANSACTION_H__ */