Transaction processor

A computer program product for processing a transaction, the computer program product comprising:

• one or more computer-readable storage devices and program instructions stored on at least one of the one or more tangible storage devices, the program instructions comprising:
• program instructions to receive a plurality of transaction request by multiple instances of transaction processing monitors, wherein each transaction request comprises details for updating a global database, and wherein each transaction request is simultaneously received by the multiple instances of transaction processing monitors and identical to the other transaction requests of the plurality of transaction requests;
• program instructions to determine, by a first transaction processing monitor of the multiple instances of transaction processing monitors when the transaction request in a queue of the transaction processing monitor, that a Unique Transaction Identifier(UTID) for a first transaction request is in a transaction state database;
• based on determining, by the first transaction processing monitor, that the UTID for the first transaction request is in the transaction state database, placing the first transaction request in a queue by each transaction processing monitor in an order in which it was received by the transaction processing monitor and receiving a second transaction request and determining whether a UTID for the second transaction request is in the transaction state database;
• based on determining that the global database has not begun updating the second transaction request, program instructions to update, by the first transaction processing monitor, an entry in the global database based on the details contained in the second transaction request and creating an entry in the transaction state database based on the UTID for the second transaction request, wherein the entry further comprises a status of the second transaction, and wherein the transaction status in the transaction state database is updated by a transaction state maintainer monitoring the update to the global database.

A computer system for processing a transaction, the computer system comprising:

• one or more processors, one or more computer-readable memories, one or more computer-readable storage devices, and program instructions stored on at least one of the one or more storage devices for execution by at least one of the one or more processors via at least one of the one or more memories, the program instructions comprising:
• program instructions to receive a plurality of transaction requests by multiple instances of transaction processing monitors, wherein the transaction request comprises details for updating a global database, and wherein each transaction request is simultaneously received by the multiple instances of transaction processing monitors and identical to the other transaction requests of the plurality of transaction requests;
• program instructions to determine, by a first transaction processing monitor of the multiple instances of transaction processing monitors when the transaction request in a queue of the transaction processing monitor, that a Unique Transaction Identifier(UTID) for a first transaction request is in a transaction state database;
• based on determining, by the first transaction processing monitor, that the UTID for the first transaction request is in the transaction state database, placing the first transaction request in a queue by each transaction processing monitor in an order in which it was received by the transaction processing monitor and receiving a second transaction request and determining whether a UTID for the second transaction request is in the transaction state database
• based on determining that the global database has not begun updating the second transaction request, program instructions to update, by the first transaction processing monitor, an entry in the global database based on the details contained in the second transaction request and creating an entry in the transaction state database based on the UTID for the second transaction request, wherein the entry further comprises a status of the second transaction, and wherein the transaction status in the transaction state database is updated by a transaction state maintainer monitoring the update to the global database.