path: root/storage/ndb/include/ndbapi/NdbTransaction.hpp

/* Copyright (c) 2003-2007 MySQL AB
   Use is subject to license terms

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA */

#ifndef NdbTransaction_H
#define NdbTransaction_H

#include <ndb_types.h>
#include "NdbError.hpp"
#include "NdbDictionary.hpp"
#include "Ndb.hpp"
#include "NdbOperation.hpp"

class NdbTransaction;
class NdbOperation;
class NdbScanOperation;
class NdbIndexScanOperation;
class NdbIndexOperation;
class NdbApiSignal;
class Ndb;
class NdbBlob;

#ifndef DOXYGEN_SHOULD_SKIP_INTERNAL
// to be documented later
/**
 * NdbAsynchCallback functions are used when executing asynchronous 
 * transactions (using NdbTransaction::executeAsynchPrepare, or 
 * NdbTransaction::executeAsynch).
 * The functions are called when the execute has finished.
 * See @ref secAsync for more information.
 */
typedef void (* NdbAsynchCallback)(int, NdbTransaction*, void*);
#endif

#ifndef DOXYGEN_SHOULD_SKIP_INTERNAL
enum AbortOption {
  DefaultAbortOption = NdbOperation::DefaultAbortOption,
  CommitIfFailFree = NdbOperation::AbortOnError,         
  TryCommit = NdbOperation::AbortOnError,
  AbortOnError= NdbOperation::AbortOnError,
  CommitAsMuchAsPossible = NdbOperation::AO_IgnoreError,
  AO_IgnoreError= NdbOperation::AO_IgnoreError
};
enum ExecType { 
  NoExecTypeDef = -1,
  Prepare,
  NoCommit,
  Commit,
  Rollback
};
#endif

/**
 * @class NdbTransaction
 * @brief Represents a transaction.
 *
 * A transaction (represented by an NdbTransaction object) 
 * belongs to an Ndb object and is created using 
 * Ndb::startTransaction().
 * A transaction consists of a list of operations 
 * (represented by NdbOperation, NdbScanOperation, NdbIndexOperation,
 *  and NdbIndexScanOperation objects). 
 * Each operation access exactly one table.
 *
 * After getting the NdbTransaction object, 
 * the first step is to get (allocate) an operation given the table name using
 * one of the methods getNdbOperation(), getNdbScanOperation(),
 * getNdbIndexOperation(), or getNdbIndexScanOperation().
 * Then the operation is defined. 
 * Several operations can be defined on the same 
 * NdbTransaction object, they will in that case be executed in parallell.
 * When all operations are defined, the execute()
 * method sends them to the NDB kernel for execution.
 *
 * The execute() method returns when the NDB kernel has 
 * completed execution of all operations defined before the call to 
 * execute(). All allocated operations should be properly defined 
 * before calling execute().
 *
 * A call to execute() uses one out of three types of execution:
 *  -# NdbTransaction::NoCommit  Executes operations without committing them.
 *  -# NdbTransaction::Commit    Executes remaining operation and commits the 
 *        	           complete transaction
 *  -# NdbTransaction::Rollback  Rollbacks the entire transaction.
 *
 * execute() is equipped with an extra error handling parameter. 
 * There are two alternatives:
 * -# NdbTransaction::AbortOnError (default).
 *    The transaction is aborted if there are any error during the
 *    execution
 * -# NdbTransaction::AO_IgnoreError
 *    Continue execution of transaction even if operation fails
 *
 */

/* FUTURE IMPLEMENTATION:
 * Later a prepare mode will be added when Ndb supports Prepare-To-Commit
 * The NdbTransaction can deliver the Transaction Id of the transaction.
 * After committing a transaction it is also possible to retrieve the 
 * global transaction checkpoint which the transaction was put in.
 *
 * FUTURE IMPLEMENTATION:
 * There are three methods for acquiring the NdbOperation. 
 * -# The first method is the normal where a table name is
 *    provided. In this case the primary key must be supplied through
 *    the use of the NdbOperation::equal methods on the NdbOperation object.
 * -# The second method provides the tuple identity of the tuple to be
 *    read.  The tuple identity contains a table identifier and will
 *    thus be possible to use to ensure the attribute names provided
 *    are correct.  If an object-oriented layer is put on top of NDB
 *    Cluster it is essential that all tables derived from a base
 *    class has the same attributes with the same type and the same
 *    name. Thus the application can use the tuple identity and need
 *    not known the table of the tuple.  As long as the table is
 *    derived from the known base class everything is ok.
 *    It is not possible to provide any primary key since it is 
 *    already supplied with the call to NdbTransaction::getNdbOperation. 
 * -# The third method is used when a scanned tuple is to be transferred to 
 *    another transaction. In this case it is not possible to define the 
 *    primary key since it came along from the scanned tuple.
 *
 */

class NdbTransaction
{
#ifndef DOXYGEN_SHOULD_SKIP_INTERNAL
  friend class Ndb;
  friend class NdbOperation;
  friend class NdbScanOperation;
  friend class NdbIndexOperation;
  friend class NdbIndexScanOperation;
  friend class NdbBlob;
  friend class ha_ndbcluster;
#endif

public:

  /**
   * Execution type of transaction
   */
  enum ExecType {
#ifndef DOXYGEN_SHOULD_SKIP_INTERNAL
    NoExecTypeDef=
    ::NoExecTypeDef,            ///< Erroneous type (Used for debugging only)
    Prepare= ::Prepare,         ///< <i>Missing explanation</i>
#endif
    NoCommit=                   ///< Execute the transaction as far as it has
                                ///< been defined, but do not yet commit it
#ifndef DOXYGEN_SHOULD_SKIP_INTERNAL
    ::NoCommit
#endif
    ,Commit=                    ///< Execute and try to commit the transaction
#ifndef DOXYGEN_SHOULD_SKIP_INTERNAL
    ::Commit
#endif
    ,Rollback                   ///< Rollback transaction
#ifndef DOXYGEN_SHOULD_SKIP_INTERNAL
    = ::Rollback
#endif
  };

#ifndef DOXYGEN_SHOULD_SKIP_INTERNAL
  /**
   * Convenience method to fetch this transaction's Ndb* object 
   */
  Ndb * getNdb() { 
    return theNdb; 
  }
#endif

#ifndef DOXYGEN_SHOULD_SKIP_DEPRECATED
  /**
   * Get an NdbOperation for a table.
   * Note that the operation has to be defined before it is executed.
   *
   * @note All operations within the same transaction need to 
   *       be initialized with this method.
   * 
   * @param  aTableName   The table name.
   * @return  Pointer to an NdbOperation object if successful, otherwise NULL.
   */
  NdbOperation* getNdbOperation(const char* aTableName);
#endif

  /**
   * Get an NdbOperation for a table.
   * Note that the operation has to be defined before it is executed.
   *
   * @note All operations within the same transaction need to 
   *       be initialized with this method.
   * 
   * @param  aTable  
   *         A table object (fetched by NdbDictionary::Dictionary::getTable)
   * @return  Pointer to an NdbOperation object if successful, otherwise NULL.
   */
  NdbOperation* getNdbOperation(const NdbDictionary::Table * aTable);

#ifndef DOXYGEN_SHOULD_SKIP_DEPRECATED
  /**
   * Get an operation from NdbScanOperation idlelist and 
   * get the NdbTransaction object which
   * was fetched by startTransaction pointing to this operation.
   *
   * @param  aTableName  The table name.
   * @return pointer to an NdbOperation object if successful, otherwise NULL
   */
  NdbScanOperation* getNdbScanOperation(const char* aTableName);
#endif

  /**
   * Get an operation from NdbScanOperation idlelist and 
   * get the NdbTransaction object which
   * was fetched by startTransaction pointing to this operation.
   *
   * @param  aTable  
   *         A table object (fetched by NdbDictionary::Dictionary::getTable)
   * @return pointer to an NdbOperation object if successful, otherwise NULL
   */
  NdbScanOperation* getNdbScanOperation(const NdbDictionary::Table * aTable);

#ifndef DOXYGEN_SHOULD_SKIP_DEPRECATED
  /**
   * Get an operation from NdbIndexScanOperation idlelist and 
   * get the NdbTransaction object which
   * was fetched by startTransaction pointing to this operation.
   *
   * @param  anIndexName  The index name.
   * @param  aTableName  The table name.
   * @return pointer to an NdbOperation object if successful, otherwise NULL
   */
  NdbIndexScanOperation* getNdbIndexScanOperation(const char* anIndexName,
						  const char* aTableName);
  NdbIndexScanOperation* getNdbIndexScanOperation
  (const NdbDictionary::Index *anIndex, const NdbDictionary::Table *aTable);
#endif
  
  /**
   * Get an operation from NdbIndexScanOperation idlelist and 
   * get the NdbTransaction object which
   * was fetched by startTransaction pointing to this operation.
   *
   * @param  anIndex  
             An index object (fetched by NdbDictionary::Dictionary::getIndex).
   * @return pointer to an NdbOperation object if successful, otherwise NULL
   */
  NdbIndexScanOperation* getNdbIndexScanOperation
  (const NdbDictionary::Index *anIndex);
  
#ifndef DOXYGEN_SHOULD_SKIP_DEPRECATED
  /**
   * Get an operation from NdbIndexOperation idlelist and 
   * get the NdbTransaction object that
   * was fetched by startTransaction pointing to this operation.
   *
   * @param   anIndexName   The index name (as created by createIndex).
   * @param   aTableName    The table name.
   * @return                Pointer to an NdbIndexOperation object if 
   *                        successful, otherwise NULL
   */
  NdbIndexOperation* getNdbIndexOperation(const char*  anIndexName,
                                          const char*  aTableName);
  NdbIndexOperation* getNdbIndexOperation(const NdbDictionary::Index *anIndex,
					  const NdbDictionary::Table *aTable);
#endif

  /**
   * Get an operation from NdbIndexOperation idlelist and 
   * get the NdbTransaction object that
   * was fetched by startTransaction pointing to this operation.
   *
   * @param   anIndex
   *          An index object (fetched by NdbDictionary::Dictionary::getIndex).
   * @return              Pointer to an NdbIndexOperation object if 
   *                      successful, otherwise NULL
   */
  NdbIndexOperation* getNdbIndexOperation(const NdbDictionary::Index *anIndex);

  /** 
   * @name Execute Transaction
   * @{
   */

  /**
   * Executes transaction.
   *
   * @param execType     Execution type:<br>
   *                     ExecType::NoCommit executes operations without 
   *                                        committing them.<br>
   *                     ExecType::Commit  executes remaining operations and 
   *                                       commits the complete transaction.<br>
   *                     ExecType::Rollback rollbacks the entire transaction.
   * @param abortOption  Handling of error while excuting
   *                     AbortOnError - Abort transaction if an operation fail
   *                     IgnoreError  - Accept failing operations
   * @param force        When operations should be sent to NDB Kernel.
   *                     (See @ref secAdapt.)
   *                     - 0: non-force, adaptive algorithm notices it 
   *                          (default); 
   *                     - 1: force send, adaptive algorithm notices it; 
   *                     - 2: non-force, adaptive algorithm do not notice 
   *                          the send.
   * @return 0 if successful otherwise -1.
   */
  int execute(ExecType execType,
	      NdbOperation::AbortOption = NdbOperation::DefaultAbortOption,
	      int force = 0 );
#ifndef DOXYGEN_SHOULD_SKIP_DEPRECATED
  int execute(::ExecType execType,
	      ::AbortOption abortOption = ::DefaultAbortOption,
	      int force = 0 ) {
    return execute ((ExecType)execType,
		    (NdbOperation::AbortOption)abortOption,
		    force); }
#endif

#ifndef DOXYGEN_SHOULD_SKIP_INTERNAL
  // to be documented later
  /**
   * Prepare an asynchronous transaction.
   *
   * See @ref secAsync for more information on
   * how to use this method.
   *
   * @param execType   Execution type:<br>
   *        ExecType::NoCommit executes operations without committing them.<br>
   *        ExecType::Commit   executes remaining operations and commits the 
   *                           complete transaction.<br>
   *        ExecType::Rollback rollbacks the entire transaction.
   * @param callback       A callback method.  This method gets 
   *                        called when the transaction has been 
   *                        executed.  See @ref ndbapi_async1.cpp 
   *                        for an example on how to specify and use 
   *                        a callback method.
   * @param anyObject       A void pointer.  This pointer is forwarded to the 
   *                        callback method and can be used to give 
   *                        the callback method some data to work on.
   *                        It is up to the application programmer 
   *                        to decide on the use of this pointer.
   * @param abortOption     see @ref execute
   */
  void executeAsynchPrepare(ExecType          execType,
			    NdbAsynchCallback callback,
			    void*             anyObject,
			    NdbOperation::AbortOption = NdbOperation::DefaultAbortOption);
#ifndef DOXYGEN_SHOULD_SKIP_DEPRECATED
  void executeAsynchPrepare(::ExecType       execType,
			    NdbAsynchCallback callback,
			    void*             anyObject,
			    ::AbortOption ao = ::DefaultAbortOption) {
    executeAsynchPrepare((ExecType)execType, callback, anyObject,
			 (NdbOperation::AbortOption)ao); }
#endif

  /**
   * Prepare and send an asynchronous transaction.
   *
   * This method perform the same action as 
   * NdbTransaction::executeAsynchPrepare
   * but also sends the operations to the NDB kernel.
   *
   * See NdbTransaction::executeAsynchPrepare for information
   * about the parameters of this method.
   *
   * See @ref secAsync for more information on
   * how to use this method.
   */
  void executeAsynch(ExecType            aTypeOfExec,
		     NdbAsynchCallback   aCallback,
		     void*               anyObject,
		     NdbOperation::AbortOption = NdbOperation::DefaultAbortOption,
                     int forceSend= 0);
#ifndef DOXYGEN_SHOULD_SKIP_DEPRECATED
  void executeAsynch(::ExecType         aTypeOfExec,
		     NdbAsynchCallback   aCallback,
		     void*               anyObject,
		     ::AbortOption abortOption= ::DefaultAbortOption,
                     int forceSend= 0)
  { executeAsynch((ExecType)aTypeOfExec, aCallback, anyObject,
		  (NdbOperation::AbortOption)abortOption, forceSend); }
#endif
#endif
  /**
   * Refresh
   * Update timeout counter of this transaction 
   * in the database. If you want to keep the transaction 
   * active in the database longer than the
   * transaction abort timeout.
   * @note It's not advised to take a lock on a record and keep it
   *       for a extended time since this can impact other transactions.
   *
   */
  int refresh();

  /**
   * Close transaction
   *
   * @note Equivalent to to calling Ndb::closeTransaction()
   */
#ifndef DOXYGEN_SHOULD_SKIP_INTERNAL
  /**
   * @note It is not allowed to call NdbTransaction::close after sending the
   *       transaction asynchronously before the callback method has 
   * 	   been called.
   *       (The application should keep track of the number of 
   *       outstanding transactions and wait until all of them 
   *       has completed before calling NdbTransaction::close).
   *       If the transaction is not committed it will be aborted.
   */
#endif
  void close();

#ifndef DOXYGEN_SHOULD_SKIP_INTERNAL
  /**
   * Restart transaction
   *
   *   Once a transaction has been completed successfully
   *     it can be started again wo/ calling closeTransaction/startTransaction
   *
   *  @note This method also releases completed operations
   *
   *  @note This method does not close open scans, 
   *        c.f. NdbScanOperation::close()
   *
   *  @note This method can only be called _directly_ after commit
   *        and only if commit is successful
   */
  int restart();
#endif

  /** @} *********************************************************************/

  /** 
   * @name Meta Information
   * @{
   */

  /**
   * Get global checkpoint identity (GCI) of transaction.
   *
   * Each committed transaction belong to a GCI.  
   * The log for the committed transaction is saved on 
   * disk when a global checkpoint occurs.
   * 
   * Whether or not the global checkpoint with this GCI has been 
   * saved on disk or not cannot be determined by this method.
   *
   * By comparing the GCI of a transaction with the value 
   * last GCI restored in a restarted NDB Cluster one can determine
   * whether the transaction was restored or not.
   *
   * @note Global Checkpoint Identity is undefined for scan transactions 
   *       (This is because no updates are performed in scan transactions.)
   *
   * @return GCI of transaction or -1 if GCI is not available.
   *         (Note that there has to be an NdbTransaction::execute call 
   *         with Ndb::Commit for the GCI to be available.)
   */
  int		getGCI();
			
  /**
   * Get transaction identity.
   *
   * @return  Transaction id.
   */
  Uint64	getTransactionId();

  /**
   * The commit status of the transaction.
   */
  enum CommitStatusType { 
    NotStarted,                   ///< Transaction not yet started
    Started,                      ///< <i>Missing explanation</i>
    Committed,                    ///< Transaction has been committed
    Aborted,                      ///< Transaction has been aborted
    NeedAbort                     ///< <i>Missing explanation</i>
  };

  /**
   * Get the commit status of the transaction.
   *
   * @return  The commit status of the transaction
   */
  CommitStatusType commitStatus();

  /** @} *********************************************************************/

  /** 
   * @name Error Handling
   * @{
   */

  /**
   * Get error object with information about the latest error.
   *
   * @return An error object with information about the latest error.
   */
  const NdbError & getNdbError() const;

  /**
   * Get the latest NdbOperation which had an error. 
   * This method is used on the NdbTransaction object to find the
   * NdbOperation causing an error.  
   * To find more information about the
   * actual error, use method NdbOperation::getNdbError()
   * on the returned NdbOperation object.
   *
   * @return The NdbOperation causing the latest error.
   */
  NdbOperation*	getNdbErrorOperation();

  /** 
   * Get the method number where the latest error occured.
   * 
   * @return Line number where latest error occured.
   */
  int getNdbErrorLine();

  /**
   * Get completed (i.e. executed) operations of a transaction
   *
   * This method should only be used <em>after</em> a transaction 
   * has been executed.  
   * - NdbTransaction::getNextCompletedOperation(NULL) returns the
   *   first NdbOperation object.
   * - NdbTransaction::getNextCompletedOperation(op) returns the
   *   NdbOperation object defined after the NdbOperation "op".
   * 
   * This method is typically used to fetch all NdbOperation:s of 
   * a transaction to check for errors (use NdbOperation::getNdbError 
   * to fetch the NdbError object of an NdbOperation).
   * 
   * @note This method should only be used after the transaction has been 
   *       executed and before the transaction has been closed.
   * 
   * @param   op Operation, NULL means get first operation
   * @return  Operation "after" op
   */
  const NdbOperation * getNextCompletedOperation(const NdbOperation * op)const;

#ifndef DOXYGEN_SHOULD_SKIP_INTERNAL
  const NdbOperation* getFirstDefinedOperation()const{return theFirstOpInList;}
  const NdbOperation* getLastDefinedOperation()const{return theLastOpInList;}

  /** @} *********************************************************************/

  /**
   * Execute the transaction in NoCommit mode if there are any not-yet
   * executed blob part operations of given types.  Otherwise do
   * nothing.  The flags argument is bitwise OR of (1 << optype) where
   * optype comes from NdbOperation::OperationType.  Only the basic PK
   * ops are used (read, insert, update, delete).
   */
  int executePendingBlobOps(Uint8 flags = 0xFF);

  /**
   * Get nodeId of TC for this transaction
   */
  Uint32 getConnectedNodeId(); // Get Connected node id
#endif

private:						
  /**
   * Release completed operations
   */
  void releaseCompletedOperations();

  typedef Uint64 TimeMillis_t;
  /**************************************************************************
   *	These methods are service methods to other classes in the NDBAPI.   *
   **************************************************************************/
 
  /**************************************************************************
   *	These are the create and delete methods of this class.              *
   **************************************************************************/
  NdbTransaction(Ndb* aNdb); 
  ~NdbTransaction();

  int init();           // Initialize connection object for new transaction

  int executeNoBlobs(ExecType execType, 
	             NdbOperation::AbortOption = NdbOperation::DefaultAbortOption,
	             int force = 0 );
  
  /**
   * Set Connected node id 
   * and sequence no
   */
  void setConnectedNodeId( Uint32 nodeId, Uint32 sequence); 

  void		setMyBlockReference( int );	  // Set my block refrerence
  void		setTC_ConnectPtr( Uint32 );	  // Sets TC Connect pointer
  int		getTC_ConnectPtr();		  // Gets TC Connect pointer
  void          setBuddyConPtr(Uint32);           // Sets Buddy Con Ptr
  Uint32        getBuddyConPtr();                 // Gets Buddy Con Ptr
  NdbTransaction* next();			  // Returns the next pointer
  void		next(NdbTransaction*);		  // Sets the next pointer

  enum ConStatusType { 
    NotConnected,
    Connecting,
    Connected,
    DisConnecting,
    ConnectFailure
  };
  ConStatusType Status();                 // Read the status information
  void		Status(ConStatusType);	  // Set the status information

  Uint32        get_send_size();                  // Get size to send
  void          set_send_size(Uint32);            // Set size to send;
  
  int  receiveDIHNDBTAMPER(NdbApiSignal* anApiSignal);
  int  receiveTCSEIZECONF(NdbApiSignal* anApiSignal); 
  int  receiveTCSEIZEREF(NdbApiSignal* anApiSignal);	
  int  receiveTCRELEASECONF(NdbApiSignal* anApiSignal);	
  int  receiveTCRELEASEREF(NdbApiSignal* anApiSignal);	
  int  receiveTC_COMMITCONF(const class TcCommitConf *);
  int  receiveTCKEYCONF(const class TcKeyConf *, Uint32 aDataLength);
  int  receiveTCKEY_FAILCONF(const class TcKeyFailConf *);
  int  receiveTCKEY_FAILREF(NdbApiSignal* anApiSignal);
  int  receiveTC_COMMITREF(NdbApiSignal* anApiSignal);		    	
  int  receiveTCROLLBACKCONF(NdbApiSignal* anApiSignal); // Rec TCPREPARECONF ?
  int  receiveTCROLLBACKREF(NdbApiSignal* anApiSignal);  // Rec TCPREPAREREF ?
  int  receiveTCROLLBACKREP(NdbApiSignal* anApiSignal);
  int  receiveTCINDXCONF(const class TcIndxConf *, Uint32 aDataLength);
  int  receiveTCINDXREF(NdbApiSignal*);
  int  receiveSCAN_TABREF(NdbApiSignal*);
  int  receiveSCAN_TABCONF(NdbApiSignal*, const Uint32*, Uint32 len);

  int 	doSend();	                // Send all operations
  int 	sendROLLBACK();	                // Send of an ROLLBACK
  int 	sendTC_HBREP();                 // Send a TCHBREP signal;
  int 	sendCOMMIT();                   // Send a TC_COMMITREQ signal;
  void	setGCI(int GCI);		// Set the global checkpoint identity
 
  int	OpCompleteFailure(NdbOperation*);
  int	OpCompleteSuccess();
  void	CompletedOperations();	        // Move active ops to list of completed
 
  void	OpSent();			// Operation Sent with success
  
  // Free connection related resources and close transaction
  void		release();              

  // Release all operations in connection
  void		releaseOperations();	

  // Release all cursor operations in connection
  void releaseOps(NdbOperation*);	
  void releaseScanOperations(NdbIndexScanOperation*);	
  bool releaseScanOperation(NdbIndexScanOperation** listhead,
			    NdbIndexScanOperation** listtail,
			    NdbIndexScanOperation* op);
  void releaseExecutedScanOperation(NdbIndexScanOperation*);
  
  // Set the transaction identity of the transaction
  void		setTransactionId(Uint64 aTransactionId);

  // Indicate something went wrong in the definition phase
  void		setErrorCode(int anErrorCode);		

  // Indicate something went wrong in the definition phase
  void		setOperationErrorCode(int anErrorCode);	

  // Indicate something went wrong in the definition phase
  void		setOperationErrorCodeAbort(int anErrorCode, int abortOption = -1);

  int		checkMagicNumber();		       // Verify correct object
  NdbOperation* getNdbOperation(const class NdbTableImpl* aTable,
                                NdbOperation* aNextOp = 0);
  NdbIndexScanOperation* getNdbScanOperation(const class NdbTableImpl* aTable);
  NdbIndexOperation* getNdbIndexOperation(const class NdbIndexImpl* anIndex, 
                                          const class NdbTableImpl* aTable,
                                          NdbOperation* aNextOp = 0);
  NdbIndexScanOperation* getNdbIndexScanOperation(const NdbIndexImpl* index,
						  const NdbTableImpl* table);
  
  void		handleExecuteCompletion();
  
  /****************************************************************************
   * These are the private variables of this class.
   ****************************************************************************/

  Uint32 ptr2int();
  Uint32 theId;

  // Keeps track of what the send method should do.
  enum SendStatusType { 
    NotInit,  
    InitState,  
    sendOperations,  
    sendCompleted, 
    sendCOMMITstate, 
    sendABORT, 
    sendABORTfail, 
    sendTC_ROLLBACK,  
    sendTC_COMMIT, 
    sendTC_OP       
  };
  SendStatusType theSendStatus; 
  NdbAsynchCallback  theCallbackFunction;    // Pointer to the callback function
  void*              theCallbackObject;      // The callback object pointer
  Uint32             theTransArrayIndex;     // Current index in a transaction 
                                             // array for this object
  TimeMillis_t       theStartTransTime;      // Start time of the transaction

  NdbError theError;	      	// Errorcode on transaction
  int	   theErrorLine;	// Method number of last error in NdbOperation
  NdbOperation*	theErrorOperation; // The NdbOperation where the error occurred

  Ndb* 		theNdb;			     // Pointer to Ndb object	   
  NdbTransaction* theNext;	      	     // Next pointer. Used in idle list.

  NdbOperation*	theFirstOpInList;	    // First operation in defining list.
  NdbOperation*	theLastOpInList;	    // Last operation in defining list.

  NdbOperation*	theFirstExecOpInList;	    // First executing operation in list
  NdbOperation*	theLastExecOpInList;	    // Last executing operation in list.


  NdbOperation*	theCompletedFirstOp;	    // First & last operation in completed 
  NdbOperation*	theCompletedLastOp;         // operation list.

  Uint32	theNoOfOpSent;				// How many operations have been sent	    
  Uint32	theNoOfOpCompleted;			// How many operations have completed
  Uint32	theMyRef;				// Our block reference		
  Uint32	theTCConPtr;				// Transaction Co-ordinator connection pointer.
  Uint64	theTransactionId;			// theTransactionId of the transaction
  Uint32	theGlobalCheckpointId;			// The gloabl checkpoint identity of the transaction
  Uint64 *p_latest_trans_gci;                           // Reference to latest gci for connection
  ConStatusType	theStatus;				// The status of the connection		
  enum CompletionStatus { 
    NotCompleted,
    CompletedSuccess,
    CompletedFailure,
    DefinitionFailure
  } theCompletionStatus;	  // The Completion status of the transaction
  CommitStatusType theCommitStatus;			// The commit status of the transaction
  Uint32	theMagicNumber;				// Magic Number to verify correct object

  Uint32	thePriority;				// Transaction Priority

  enum ReturnType {  ReturnSuccess,  ReturnFailure };
  ReturnType    theReturnStatus;			// Did we have any read/update/delete failing
							// to find the tuple.
  bool theTransactionIsStarted; 
  bool theInUseState;
  bool theSimpleState;

  enum ListState {  
    NotInList, 
    InPreparedList, 
    InSendList, 
    InCompletedList 
  } theListState;

  Uint32 theDBnode;       // The database node we are connected to  
  Uint32 theNodeSequence; // The sequence no of the db node
  bool theReleaseOnClose;

  /**
   * handle transaction spanning
   *   multiple TC/db nodes
   *
   * 1) Bitmask with used nodes
   * 2) Bitmask with nodes failed during op
   */
  Uint32 m_db_nodes[2];
  Uint32 m_failed_db_nodes[2];
  
  int report_node_failure(Uint32 id);

  // Scan operations
  bool m_waitForReply;     
  NdbIndexScanOperation* m_theFirstScanOperation;
  NdbIndexScanOperation* m_theLastScanOperation;
  
  NdbIndexScanOperation* m_firstExecutedScanOp;

  // Scan operations
  // The operation actually performing the scan
  NdbScanOperation* theScanningOp; 
  Uint32 theBuddyConPtr;
  // optim: any blobs
  bool theBlobFlag;
  Uint8 thePendingBlobOps;
  inline bool hasBlobOperation() { return theBlobFlag; }

  static void sendTC_COMMIT_ACK(class TransporterFacade *, NdbApiSignal *,
				Uint32 transId1, Uint32 transId2, 
				Uint32 aBlockRef);

  void completedFail(const char * s);
#ifdef VM_TRACE
  void printState();
#endif
  bool checkState_TransId(const Uint32 * transId) const;

  void remove_list(NdbOperation*& head, NdbOperation*);
  void define_scan_op(NdbIndexScanOperation*);

  friend class HugoOperations;
  friend struct Ndb_free_list_t<NdbTransaction>;
};

#ifndef DOXYGEN_SHOULD_SKIP_INTERNAL

inline
Uint32
NdbTransaction::get_send_size()
{
  return 0;
}

inline
void
NdbTransaction::set_send_size(Uint32 send_size)
{
  return;
}

#ifdef NDB_NO_DROPPED_SIGNAL
#include <stdlib.h>
#endif

inline
int
NdbTransaction::checkMagicNumber()
{
  if (theMagicNumber == 0x37412619)
    return 0;
  else {
#ifdef NDB_NO_DROPPED_SIGNAL
    abort();
#endif
    return -1;
  }
}

inline
bool
NdbTransaction::checkState_TransId(const Uint32 * transId) const {
  const Uint32 tTmp1 = transId[0];
  const Uint32 tTmp2 = transId[1];
  Uint64 tRecTransId = (Uint64)tTmp1 + ((Uint64)tTmp2 << 32);
  bool b = theStatus == Connected && theTransactionId == tRecTransId;
  return b;
}

/************************************************************************************************
void setTransactionId(Uint64 aTransactionId);

Remark:        Set the transaction identity. 
************************************************************************************************/
inline
void
NdbTransaction::setTransactionId(Uint64 aTransactionId)
{
  theTransactionId = aTransactionId;
}

inline
void			
NdbTransaction::setConnectedNodeId(Uint32 aNode, Uint32 aSequenceNo)
{
  theDBnode = aNode;
  theNodeSequence = aSequenceNo;
}	
/******************************************************************************
int getConnectedNodeId();

Return Value:	Return  theDBnode.
Remark:         Get Connected node id. 
******************************************************************************/
inline
Uint32			
NdbTransaction::getConnectedNodeId()
{
  return theDBnode;
}	
/******************************************************************************
void setMyBlockReference(int aBlockRef);

Parameters:     aBlockRef: The block refrerence.
Remark:         Set my block refrerence. 
******************************************************************************/
inline
void			
NdbTransaction::setMyBlockReference(int aBlockRef)	
{
  theMyRef = aBlockRef;
}
/******************************************************************************
void  setTC_ConnectPtr(Uint32 aTCConPtr);

Parameters:     aTCConPtr: The connection pointer.
Remark:         Sets TC Connect pointer. 
******************************************************************************/
inline
void			
NdbTransaction::setTC_ConnectPtr(Uint32 aTCConPtr)
{
  theTCConPtr = aTCConPtr;
}

/******************************************************************************
int  getTC_ConnectPtr();

Return Value:	Return  theTCConPtr.
Remark:         Gets TC Connect pointer. 
******************************************************************************/
inline
int			
NdbTransaction::getTC_ConnectPtr()
{
  return theTCConPtr;
}

inline
void
NdbTransaction::setBuddyConPtr(Uint32 aBuddyConPtr)
{
  theBuddyConPtr = aBuddyConPtr;
}

inline
Uint32 NdbTransaction::getBuddyConPtr()
{
  return theBuddyConPtr;
}

/******************************************************************************
NdbTransaction* next();

inline
void
NdbTransaction::setBuddyConPtr(Uint32 aBuddyConPtr)
{
  theBuddyConPtr = aBuddyConPtr;
}

inline
Uint32 NdbTransaction::getBuddyConPtr()
{
  return theBuddyConPtr;
}

Return Value:	Return  next pointer to NdbTransaction object.
Remark:         Get the next pointer. 
******************************************************************************/
inline
NdbTransaction*
NdbTransaction::next()
{
  return theNext;
}

/******************************************************************************
void next(NdbTransaction aTransaction);

Parameters:     aTransaction: The connection object. 
Remark:         Sets the next pointer. 
******************************************************************************/
inline
void
NdbTransaction::next(NdbTransaction* aTransaction)
{
  theNext = aTransaction;
}

/******************************************************************************
ConStatusType  Status();

Return Value    Return the ConStatusType.	
Parameters:     aStatus:  The status.
Remark:         Sets Connect status. 
******************************************************************************/
inline
NdbTransaction::ConStatusType			
NdbTransaction::Status()
{
  return theStatus;
}

/******************************************************************************
void  Status(ConStatusType aStatus);

Parameters:     aStatus: The status.
Remark:         Sets Connect status. 
******************************************************************************/
inline
void			
NdbTransaction::Status( ConStatusType aStatus )
{
  theStatus = aStatus;
}


/******************************************************************************
 void    	setGCI();

Remark:		Set global checkpoint identity of the transaction
******************************************************************************/
inline
void
NdbTransaction::setGCI(int aGlobalCheckpointId)
{
  theGlobalCheckpointId = aGlobalCheckpointId;
}

/******************************************************************************
void OpSent();

Remark:       An operation was sent with success that expects a response.
******************************************************************************/
inline
void 
NdbTransaction::OpSent()
{
  theNoOfOpSent++;
}

/******************************************************************************
void executePendingBlobOps();
******************************************************************************/
#include <stdlib.h>
inline
int
NdbTransaction::executePendingBlobOps(Uint8 flags)
{
  if (thePendingBlobOps & flags) {
    // not executeNoBlobs because there can be new ops with blobs
    return execute(NoCommit);
  }
  return 0;
}

inline
Uint32
NdbTransaction::ptr2int(){
  return theId;
}

typedef NdbTransaction NdbConnection;

#endif // ifndef DOXYGEN_SHOULD_SKIP_INTERNAL

#endif