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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems
* Copyright (c) 2010 Jay Pipes <jaypipes@gmail.com>
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file Transaction processing code
*/
#ifndef DRIZZLED_TRANSACTION_SERVICES_H
#define DRIZZLED_TRANSACTION_SERVICES_H
#include "drizzled/atomics.h"
#include "drizzled/message/transaction.pb.h"
namespace drizzled
{
/* some forward declarations needed */
namespace plugin
{
class MonitoredInTransaction;
class XaResourceManager;
class TransactionalStorageEngine;
}
class Session;
class NamedSavepoint;
/**
* This is a class which manages the XA transaction processing
* in the server
*/
class TransactionServices
{
public:
static const size_t DEFAULT_RECORD_SIZE= 100;
typedef uint64_t TransactionId;
/**
* Constructor
*/
TransactionServices()
{
/**
* @todo set transaction ID to the last one from an applier...
*/
current_transaction_id= 0;
}
/**
* Singleton method
* Returns the singleton instance of TransactionServices
*/
static inline TransactionServices &singleton()
{
static TransactionServices transaction_services;
return transaction_services;
}
/**
* Returns true if the transaction manager should construct
* Transaction and Statement messages, false otherwise.
*/
bool shouldConstructMessages();
/**
* Method which returns the active Transaction message
* for the supplied Session. If one is not found, a new Transaction
* message is allocated, initialized, and returned. It is possible that
* we may want to NOT increment the transaction id for a new Transaction
* object (e.g., splitting up Transactions into smaller chunks). The
* should_inc_trx_id flag controls if we do this.
*
* @param in_session The session processing the transaction
* @param should_inc_trx_id If true, increments the transaction id for a new trx
*/
message::Transaction *getActiveTransactionMessage(Session *in_session,
bool should_inc_trx_id= true);
/**
* Method which attaches a transaction context
* the supplied transaction based on the supplied Session's
* transaction information. This method also ensure the
* transaction message is attached properly to the Session object
*
* @param in_transaction The transaction message to initialize
* @param in_session The Session processing this transaction
* @param should_inc_trx_id If true, increments the transaction id for a new trx
*/
void initTransactionMessage(message::Transaction &in_transaction,
Session *in_session,
bool should_inc_trx_id);
/**
* Helper method which finalizes data members for the
* supplied transaction's context.
*
* @param in_transaction The transaction message to finalize
* @param in_session The Session processing this transaction
*/
void finalizeTransactionMessage(message::Transaction &in_transaction, Session *in_session);
/**
* Helper method which deletes transaction memory and
* unsets Session's transaction and statement messages.
*/
void cleanupTransactionMessage(message::Transaction *in_transaction,
Session *in_session);
/**
* Helper method which initializes a Statement message
*
* @param statement The statement to initialize
* @param in_type The type of the statement
* @param in_session The session processing this statement
*/
void initStatementMessage(message::Statement &statement,
message::Statement::Type in_type,
Session *in_session);
/**
* Finalizes a Statement message and sets the Session's statement
* message to NULL.
*
* @param statement The statement to initialize
* @param in_session The session processing this statement
*/
void finalizeStatementMessage(message::Statement &statement,
Session *in_session);
/** Helper method which returns an initialized Statement message for methods
* doing insertion of data.
*
* @param[in] in_session Pointer to the Session doing the processing
* @param[in] in_table Pointer to the Table object being inserted into
* @param[out] next_segment_id The next Statement segment id to be used
*/
message::Statement &getInsertStatement(Session *in_session,
Table *in_table,
uint32_t *next_segment_id);
/**
* Helper method which initializes the header message for
* insert operations.
*
* @param[in,out] statement Statement message container to modify
* @param[in] in_session Pointer to the Session doing the processing
* @param[in] in_table Pointer to the Table being inserted into
*/
void setInsertHeader(message::Statement &statement,
Session *in_session,
Table *in_table);
/**
* Helper method which returns an initialized Statement
* message for methods doing updates of data.
*
* @param[in] in_session Pointer to the Session doing the processing
* @param[in] in_table Pointer to the Table object being updated
* @param[in] old_record Pointer to the old data in the record
* @param[in] new_record Pointer to the new data in the record
* @param[out] next_segment_id The next Statement segment id to be used
*/
message::Statement &getUpdateStatement(Session *in_session,
Table *in_table,
const unsigned char *old_record,
const unsigned char *new_record,
uint32_t *next_segment_id);
/**
* Helper method which initializes the header message for
* update operations.
*
* @param[in,out] statement Statement message container to modify
* @param[in] in_session Pointer to the Session doing the processing
* @param[in] in_table Pointer to the Table being updated
* @param[in] old_record Pointer to the old data in the record
* @param[in] new_record Pointer to the new data in the record
*/
void setUpdateHeader(message::Statement &statement,
Session *in_session,
Table *in_table,
const unsigned char *old_record,
const unsigned char *new_record);
/**
* Helper method which returns an initialized Statement
* message for methods doing deletion of data.
*
* @param[in] in_session Pointer to the Session doing the processing
* @param[in] in_table Pointer to the Table object being deleted from
* @param[out] next_segment_id The next Statement segment id to be used
*/
message::Statement &getDeleteStatement(Session *in_session,
Table *in_table,
uint32_t *next_segment_id);
/**
* Helper method which initializes the header message for
* insert operations.
*
* @param[in,out] statement Statement message container to modify
* @param[in] in_session Pointer to the Session doing the processing
* @param[in] in_table Pointer to the Table being deleted from
*/
void setDeleteHeader(message::Statement &statement,
Session *in_session,
Table *in_table);
/**
* Commits a normal transaction (see above) and pushes the transaction
* message out to the replicators.
*
* @param in_session Pointer to the Session committing the transaction
*/
int commitTransactionMessage(Session *in_session);
/**
* Marks the current active transaction message as being rolled back and
* pushes the transaction message out to replicators.
*
* @param in_session Pointer to the Session committing the transaction
*/
void rollbackTransactionMessage(Session *in_session);
/**
* Creates a new InsertRecord GPB message and pushes it to
* replicators.
*
* @param in_session Pointer to the Session which has inserted a record
* @param in_table Pointer to the Table containing insert information
*
* Grr, returning "true" here on error because of the cursor
* reversed bool return crap...fix that.
*/
bool insertRecord(Session *in_session, Table *in_table);
/**
* Creates a new UpdateRecord GPB message and pushes it to
* replicators.
*
* @param in_session Pointer to the Session which has updated a record
* @param in_table Pointer to the Table containing update information
* @param old_record Pointer to the raw bytes representing the old record/row
* @param new_record Pointer to the raw bytes representing the new record/row
*/
void updateRecord(Session *in_session,
Table *in_table,
const unsigned char *old_record,
const unsigned char *new_record);
/**
* Creates a new DeleteRecord GPB message and pushes it to
* replicators.
*
* @param in_session Pointer to the Session which has deleted a record
* @param in_table Pointer to the Table containing delete information
* @param use_update_record If true, uses the values from the update row instead
*/
void deleteRecord(Session *in_session, Table *in_table, bool use_update_record= false);
/**
* Creates a CreateSchema Statement GPB message and adds it
* to the Session's active Transaction GPB message for pushing
* out to the replicator streams.
*
* @param[in] in_session Pointer to the Session which issued the statement
* @param[in] schema message::Schema message describing new schema
*/
void createSchema(Session *in_session, const message::Schema &schema);
/**
* Creates a DropSchema Statement GPB message and adds it
* to the Session's active Transaction GPB message for pushing
* out to the replicator streams.
*
* @param[in] in_session Pointer to the Session which issued the statement
* @param[in] schema_name message::Schema message describing new schema
*/
void dropSchema(Session *in_session, const std::string &schema_name);
/**
* Creates a CreateTable Statement GPB message and adds it
* to the Session's active Transaction GPB message for pushing
* out to the replicator streams.
*
* @param[in] in_session Pointer to the Session which issued the statement
* @param[in] table message::Table message describing new schema
*/
void createTable(Session *in_session, const message::Table &table);
/**
* Creates a DropTable Statement GPB message and adds it
* to the Session's active Transaction GPB message for pushing
* out to the replicator streams.
*
* @param[in] in_session Pointer to the Session which issued the statement
* @param[in] schema_name The schema of the table being dropped
* @param[in] table_name The table name of the table being dropped
* @param[in] if_exists Did the user specify an IF EXISTS clause?
*/
void dropTable(Session *in_session,
const std::string &schema_name,
const std::string &table_name,
bool if_exists);
/**
* Creates a TruncateTable Statement GPB message and adds it
* to the Session's active Transaction GPB message for pushing
* out to the replicator streams.
*
* @param[in] in_session Pointer to the Session which issued the statement
* @param[in] in_table The Table being truncated
*/
void truncateTable(Session *in_session, Table *in_table);
/**
* Creates a new RawSql GPB message and pushes it to
* replicators.
*
* @TODO With a real data dictionary, this really shouldn't
* be needed. CREATE TABLE would map to insertRecord call
* on the I_S, etc. Not sure what to do with administrative
* commands like CHECK TABLE, though..
*
* @param in_session Pointer to the Session which issued the statement
* @param query Query string
*/
void rawStatement(Session *in_session, const std::string &query);
/* transactions: interface to plugin::StorageEngine functions */
int commitPhaseOne(Session *session, bool all);
int rollbackTransaction(Session *session, bool all);
/* transactions: these functions never call plugin::StorageEngine functions directly */
int commitTransaction(Session *session, bool all);
int autocommitOrRollback(Session *session, int error);
/* savepoints */
int rollbackToSavepoint(Session *session, NamedSavepoint &sv);
int setSavepoint(Session *session, NamedSavepoint &sv);
int releaseSavepoint(Session *session, NamedSavepoint &sv);
/**
* Marks a storage engine as participating in a statement
* transaction.
*
* @note
*
* This method is idempotent
*
* @todo
*
* This method should not be called more than once per resource
* per statement, and therefore should not need to be idempotent.
* Put in assert()s to test this.
*
* @param[in] session Session pointer
* @param[in] monitored Descriptor for the resource which will be participating
* @param[in] engine Pointer to the TransactionalStorageEngine resource
*/
void registerResourceForStatement(Session *session,
plugin::MonitoredInTransaction *monitored,
plugin::TransactionalStorageEngine *engine);
/**
* Marks an XA storage engine as participating in a statement
* transaction.
*
* @note
*
* This method is idempotent
*
* @todo
*
* This method should not be called more than once per resource
* per statement, and therefore should not need to be idempotent.
* Put in assert()s to test this.
*
* @param[in] session Session pointer
* @param[in] monitored Descriptor for the resource which will be participating
* @param[in] engine Pointer to the TransactionalStorageEngine resource
* @param[in] resource_manager Pointer to the XaResourceManager resource manager
*/
void registerResourceForStatement(Session *session,
plugin::MonitoredInTransaction *monitored,
plugin::TransactionalStorageEngine *engine,
plugin::XaResourceManager *resource_manager);
/**
* Registers a resource manager in the "normal" transaction.
*
* @note
*
* This method is idempotent and must be idempotent
* because it can be called both by the above
* TransactionServices::registerResourceForStatement(),
* which occurs at the beginning of each SQL statement,
* and also manually when a BEGIN WORK/START TRANSACTION
* statement is executed. If the latter case (BEGIN WORK)
* is called, then subsequent contained statement transactions
* will call this method as well.
*
* @note
*
* This method checks to see if the supplied resource
* is also registered in the statement transaction, and
* if not, registers the resource in the statement
* transaction. This happens ONLY when the user has
* called BEGIN WORK/START TRANSACTION, which is the only
* time when this method is called except from the
* TransactionServices::registerResourceForStatement method.
*/
void registerResourceForTransaction(Session *session,
plugin::MonitoredInTransaction *monitored,
plugin::TransactionalStorageEngine *engine);
void registerResourceForTransaction(Session *session,
plugin::MonitoredInTransaction *monitored,
plugin::TransactionalStorageEngine *engine,
plugin::XaResourceManager *resource_manager);
TransactionId getNextTransactionId()
{
return current_transaction_id.increment();
}
TransactionId getCurrentTransactionId()
{
return current_transaction_id;
}
/**
* DEBUG ONLY. See plugin::TransactionLog::truncate()
*/
void resetTransactionId()
{
current_transaction_id= 0;
}
private:
atomic<TransactionId> current_transaction_id;
};
} /* namespace drizzled */
#endif /* DRIZZLED_TRANSACTION_SERVICES_H */
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