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Leonid Fedorov
@ -44,17 +44,16 @@
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#endif
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#ifdef _MSC_VER
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#pragma warning (push)
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#pragma warning (disable : 4200)
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#pragma warning(push)
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#pragma warning(disable : 4200)
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#endif
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namespace BRM
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{
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/** @brief Issues transaction IDs and keeps track of the current system-wide version ID.
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*
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* This class's primary purpose is to keep track of the current system-wide version ID and issue transaction IDs.
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* It can be used simultaneously by multiple threads and processes.
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* This class's primary purpose is to keep track of the current system-wide version ID and issue transaction
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* IDs. It can be used simultaneously by multiple threads and processes.
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*
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* It uses system-wide semaphores and shared memory segments for IPC.
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* It allocates both if they don't already exist, but it only deallocates
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@ -91,204 +90,207 @@ namespace BRM
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class SessionManagerServer
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{
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public:
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/** @brief SID = Session ID */
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typedef uint32_t SID;
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public:
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/** @brief SID = Session ID */
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typedef uint32_t SID;
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// State flags. These bit values are stored in Overlay::state and reflect the current state of the system
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static const uint32_t SS_READY; /// bit 0 => Set by dmlProc one time when dmlProc is ready
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static const uint32_t SS_SUSPENDED; /// bit 1 => Set by console when the system has been suspended by user.
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static const uint32_t SS_SUSPEND_PENDING; /// bit 2 => Set by console when user wants to suspend, but writing is occuring.
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static const uint32_t SS_SHUTDOWN_PENDING; /// bit 3 => Set by console when user wants to shutdown, but writing is occuring.
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static const uint32_t SS_ROLLBACK; /// bit 4 => In combination with a PENDING flag, force a rollback as soom as possible.
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static const uint32_t SS_FORCE; /// bit 5 => In combination with a PENDING flag, force a shutdown without rollback.
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static const uint32_t SS_QUERY_READY; /// bit 6 => Set by ProcManager when system is ready for queries
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// State flags. These bit values are stored in Overlay::state and reflect the current state of the system
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static const uint32_t SS_READY; /// bit 0 => Set by dmlProc one time when dmlProc is ready
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static const uint32_t SS_SUSPENDED; /// bit 1 => Set by console when the system has been suspended by user.
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static const uint32_t
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SS_SUSPEND_PENDING; /// bit 2 => Set by console when user wants to suspend, but writing is occuring.
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static const uint32_t
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SS_SHUTDOWN_PENDING; /// bit 3 => Set by console when user wants to shutdown, but writing is occuring.
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static const uint32_t
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SS_ROLLBACK; /// bit 4 => In combination with a PENDING flag, force a rollback as soom as possible.
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static const uint32_t
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SS_FORCE; /// bit 5 => In combination with a PENDING flag, force a shutdown without rollback.
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static const uint32_t SS_QUERY_READY; /// bit 6 => Set by ProcManager when system is ready for queries
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/** @brief Constructor
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*
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* This sets up the shared memory segment & semaphores used by this
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* instance. No additional set-up calls are necessary.
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* @note throws ios_base::failure on file IO error, runtime_error for
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* other types of errors. It might be worthwhile to define additional
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* exceptions for all the different types of failures that can happen
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* here.
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*/
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EXPORT SessionManagerServer();
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/** @brief Constructor
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*
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* This sets up the shared memory segment & semaphores used by this
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* instance. No additional set-up calls are necessary.
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* @note throws ios_base::failure on file IO error, runtime_error for
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* other types of errors. It might be worthwhile to define additional
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* exceptions for all the different types of failures that can happen
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* here.
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*/
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EXPORT SessionManagerServer();
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/** @brief Destructor
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*
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* This detaches the shared memory segment. If DESTROYSHMSEG is defined and this
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* is the last reference to it, it will be saved to disk and destroyed.
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* It does not destroy the semaphores. Those persist until the system
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* is shut down.
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*/
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virtual ~SessionManagerServer();
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/** @brief Destructor
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*
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* This detaches the shared memory segment. If DESTROYSHMSEG is defined and this
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* is the last reference to it, it will be saved to disk and destroyed.
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* It does not destroy the semaphores. Those persist until the system
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* is shut down.
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*/
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virtual ~SessionManagerServer();
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/** @brief Gets the current version ID
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*
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* Gets the current version ID.
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*/
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EXPORT const QueryContext verID();
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/** @brief Gets the current version ID
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*
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* Gets the current version ID.
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*/
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EXPORT const QueryContext verID();
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/** @brief Gets the current version ID
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*
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* Gets the current version ID.
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*/
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EXPORT const QueryContext sysCatVerID();
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/** @brief Gets the current version ID
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*
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* Gets the current version ID.
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*/
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EXPORT const QueryContext sysCatVerID();
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/** @brief Gets a new Transaction ID
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*
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* Makes a new Transaction ID, associates it with the given session
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* and increments the system-wide version ID
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* @note This blocks until (# active transactions) \< MaxTxns unless block == false
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* @note Throws runtime_error on semaphore-related error
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* @note This will always return a valid TxnID unless block == false, in which case
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* it will return a valid TxnID iff it doesn't have to block.
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* @param session The session ID to associate with the transaction ID
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* @param block If true, this will block until there is an available slot, otherwise
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* it will return a TxnID marked invalid, signifying that it could not start a new transaction
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* @return The new transaction ID.
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*/
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EXPORT const TxnID newTxnID(const SID session, bool block = true, bool isDDL = false);
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/** @brief Gets a new Transaction ID
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*
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* Makes a new Transaction ID, associates it with the given session
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* and increments the system-wide version ID
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* @note This blocks until (# active transactions) \< MaxTxns unless block == false
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* @note Throws runtime_error on semaphore-related error
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* @note This will always return a valid TxnID unless block == false, in which case
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* it will return a valid TxnID iff it doesn't have to block.
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* @param session The session ID to associate with the transaction ID
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* @param block If true, this will block until there is an available slot, otherwise
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* it will return a TxnID marked invalid, signifying that it could not start a new transaction
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* @return The new transaction ID.
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*/
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EXPORT const TxnID newTxnID(const SID session, bool block = true, bool isDDL = false);
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/** @brief Record that a transaction has been committed
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*
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* Record that a transaction has been committed.
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* @note Throws runtime_error on a semaphore-related error, invalid_argument
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* when txnid can't be found
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* @param txnid The committed transaction ID. This is marked invalid
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* on return.
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*/
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void committed(TxnID& txn)
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{
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finishTransaction(txn);
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}
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/** @brief Record that a transaction has been committed
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*
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* Record that a transaction has been committed.
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* @note Throws runtime_error on a semaphore-related error, invalid_argument
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* when txnid can't be found
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* @param txnid The committed transaction ID. This is marked invalid
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* on return.
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*/
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void committed(TxnID& txn)
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{
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finishTransaction(txn);
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}
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/** @brief Record that a transaction has been rolled back
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*
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* Record that a transaction has been rolled back.
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* @note Throws runtime_error on a semaphore-related error, invalid_argument
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* when txnid can't be found
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* @param txnid The rolled back transaction ID. This is marked invalid
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* on return.
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*/
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void rolledback(TxnID& txn)
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{
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finishTransaction(txn);
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}
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/** @brief Record that a transaction has been rolled back
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*
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* Record that a transaction has been rolled back.
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* @note Throws runtime_error on a semaphore-related error, invalid_argument
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* when txnid can't be found
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* @param txnid The rolled back transaction ID. This is marked invalid
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* on return.
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*/
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void rolledback(TxnID& txn)
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{
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finishTransaction(txn);
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}
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/** @brief Gets the transaction ID associated with a given session ID
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*
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* Gets the transaction ID associated with a given session ID.
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* @note Throws runtime_error on a semaphore-related error
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* @param session The session ID
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* @return A valid transaction ID if there's an association; an invalid
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* one if there isn't.
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*/
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EXPORT const TxnID getTxnID(const SID session);
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/** @brief Gets the transaction ID associated with a given session ID
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*
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* Gets the transaction ID associated with a given session ID.
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* @note Throws runtime_error on a semaphore-related error
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* @param session The session ID
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* @return A valid transaction ID if there's an association; an invalid
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* one if there isn't.
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*/
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EXPORT const TxnID getTxnID(const SID session);
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/** @brief Gets an array containing all active SID-TID associations
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*
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* Gets an array containing the SID-TID associations of all active
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* transactions. This is intended to be used by another object
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* that can determine which sessions are still live and which
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* transactions need to go away.
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* @note Throws runtime_error on a semaphore-related error
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* @param len (out) the length of the array
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* @return A pointer to the array. Note: The caller is responsible for
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* deallocating it. Use delete[].
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*/
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EXPORT boost::shared_array<SIDTIDEntry> SIDTIDMap(int& len);
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/** @brief Gets an array containing all active SID-TID associations
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*
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* Gets an array containing the SID-TID associations of all active
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* transactions. This is intended to be used by another object
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* that can determine which sessions are still live and which
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* transactions need to go away.
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* @note Throws runtime_error on a semaphore-related error
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* @param len (out) the length of the array
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* @return A pointer to the array. Note: The caller is responsible for
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* deallocating it. Use delete[].
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*/
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EXPORT boost::shared_array<SIDTIDEntry> SIDTIDMap(int& len);
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/**
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* get a unique 32-bit number
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*/
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uint32_t getUnique32()
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{
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return atomicops::atomicInc(&unique32);
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}
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/**
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* get a unique 32-bit number
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*/
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uint32_t getUnique32()
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{
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return atomicops::atomicInc(&unique32);
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}
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/**
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* get a unique 64-bit number
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*/
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uint64_t getUnique64()
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{
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return atomicops::atomicInc(&unique64);
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}
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/**
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* get a unique 64-bit number
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*/
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uint64_t getUnique64()
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{
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return atomicops::atomicInc(&unique64);
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}
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/** @brief Resets the semaphores to their original state. For testing only.
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*
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* Resets the semaphores to their original state. For testing only.
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*/
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EXPORT void reset();
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/** @brief Resets the semaphores to their original state. For testing only.
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*
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* Resets the semaphores to their original state. For testing only.
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*/
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EXPORT void reset();
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/**
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* get the Txn ID filename
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*/
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std::string getTxnIDFilename() const
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{
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return txnidFilename;
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}
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/**
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* get the Txn ID filename
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*/
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std::string getTxnIDFilename() const
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{
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return txnidFilename;
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}
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/** @brief set system state info
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*
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* Sets the bits on in Overlay::systemState that are found on in
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* state. That is Overlay::systemState | state.
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*/
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EXPORT void setSystemState(uint32_t state);
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/** @brief set system state info
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*
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* Sets the bits on in Overlay::systemState that are found on in
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* state. That is Overlay::systemState | state.
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*/
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EXPORT void setSystemState(uint32_t state);
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/** @brief set system state info
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*
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* Clears the bits on in Overlay::systemState that are found on
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* in state. That is Overlay::systemState & ~state.
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*/
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EXPORT void clearSystemState(uint32_t state);
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/** @brief set system state info
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*
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* Clears the bits on in Overlay::systemState that are found on
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* in state. That is Overlay::systemState & ~state.
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*/
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EXPORT void clearSystemState(uint32_t state);
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/** @brief get system state info
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*
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* Returns the Overlay::systemState flags
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*/
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void getSystemState(uint32_t& state)
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{
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state = systemState;
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}
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/** @brief get system state info
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*
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* Returns the Overlay::systemState flags
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*/
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void getSystemState(uint32_t& state)
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{
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state = systemState;
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}
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/**
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* get the number of active txn's
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*/
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EXPORT uint32_t getTxnCount();
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/**
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* get the number of active txn's
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*/
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EXPORT uint32_t getTxnCount();
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private:
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SessionManagerServer(const SessionManagerServer&);
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SessionManagerServer& operator=(const SessionManagerServer&);
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private:
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SessionManagerServer(const SessionManagerServer&);
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SessionManagerServer& operator=(const SessionManagerServer&);
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void loadState();
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void saveSystemState();
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void finishTransaction(TxnID& txn);
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void saveSMTxnIDAndState();
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void loadState();
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void saveSystemState();
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void finishTransaction(TxnID& txn);
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void saveSMTxnIDAndState();
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volatile uint32_t unique32;
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volatile uint64_t unique64;
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volatile uint32_t unique32;
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volatile uint64_t unique64;
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int maxTxns; // the maximum number of concurrent transactions
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std::string txnidFilename;
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execplan::CalpontSystemCatalog::SCN _verID;
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execplan::CalpontSystemCatalog::SCN _sysCatVerID;
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uint32_t systemState;
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int maxTxns; // the maximum number of concurrent transactions
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std::string txnidFilename;
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execplan::CalpontSystemCatalog::SCN _verID;
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execplan::CalpontSystemCatalog::SCN _sysCatVerID;
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uint32_t systemState;
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std::map<SID, execplan::CalpontSystemCatalog::SCN> activeTxns;
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typedef std::map<SID, execplan::CalpontSystemCatalog::SCN>::iterator iterator;
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std::map<SID, execplan::CalpontSystemCatalog::SCN> activeTxns;
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typedef std::map<SID, execplan::CalpontSystemCatalog::SCN>::iterator iterator;
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boost::mutex mutex;
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boost::condition_variable condvar; // used to synthesize a semaphore
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uint32_t semValue;
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boost::mutex mutex;
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boost::condition_variable condvar; // used to synthesize a semaphore
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uint32_t semValue;
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};
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} //namespace
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} // namespace BRM
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#ifdef _MSC_VER
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#pragma warning (pop)
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#pragma warning(pop)
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#endif
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#undef EXPORT
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