International Business Machines Corporation

Iain Stuart Houston

Simon Antony Holdsworth

Thomas James Freund

Stanley Alan Smith

Simon Anthony Holdsworth

Edward Ellis Cobb

Robert Anthony Storey

An object oriented transaction processing system based on the Object Management Group Object Management Architecture provides effective transaction scheduling and servicing through a combination of Object Transaction Services and a Transactional Object Request Broker. The Object Transactional Services manage the information needed to provide reliability in transactions, including a two phase commit process to implement transaction atomicity. The transactional Object Request Broker includes a transaction monitor facility to schedule objects to respond to object transaction requests. The tunable transaction monitor increases the efficiency of transaction processing by optimizing use of computer system resources allocated to servicing transactions. The transaction monitor activates the objects necessary to satisfy a transaction request. Activation includes an ability to start new processes or threads of execution or to reuse existing processes or threads. The transaction monitor interfaces to the Object Request Broker are clearly defined allowing substitution of different transaction monitors as dictated by the application.

Object oriented transaction monitor for distributed transaction

A server concurrency control technique for use in a client/server computing system where a client sends a request to a server for access to a server resource involves receiving client requests of a plurality of lock requester types at a lock requester interface; comparing each of said requests against a lock requester set which has a lock requester type representation corresponding to a lock requester type of previously received client requests which are presently holding locks to server resources; and as a result of the comparing step, determining whether a newly received client request conflicts with previously received client requests which are currently holding locks to server resources.

Apparatus, method and computer program for providing arbitrary locking

A concurrency control mechanism for a client/server computing system analyzes each client request to determine whether it can be given concurrent access to a server's resources, along with other client requests which are presently accessing the server's resources. Each client request triggers the setting up of a lock request mode which contains conflict resolution logic based on the particulars of the corresponding request. When a new request comes in, the new request's newly created lock request mode is compared to the lock request modes of the previous requests which are currently accessing the server's resources and the conflict resolution logic is carried out to determine whether the new request should be also allowed access.

A system and process for enhancing procedural software using object oriented classes. Implementation classes are constructed that provide a defined object oriented interface to applications and are able to invoke the procedural software using defined procedural application program interfaces (APIs). New function is added to the software by adding classes that interface to the implementation classes or directly to the procedural API. The new function builds upon the procedural software without accessing the procedural software source code or modifying that source code.

System and method for functionally enhancing procedural software using

An apparatus for dispatching client requests within a server computer system, wherein the client requests are issued from at least one client computer system on a different platform from said server computer system and are passed through a communications channel to said server computer system, the apparatus comprising: a buffer having an input connected to said communications channel and an output; a plurality of parallel execution threads connected to said output of said buffer; and a scheduling means for distributing client requests stored in said buffer to said plurality of execution threads in a manner such that related client requests are sent to the same execution thread.

Apparatus and method for dispatching client method calls within a server

A method and system for implementing a Restart Service for the Object Transaction Service are described. The present invention provides a method and system which trigger restart of an OTS instance upon system recovery or upon system failure. The Restart Service runs independently of the client or server processes which it restarts. When a client or server enters a pending state for a transaction, a permanent record containing information to allow the OTS instance to be restarted is stored in a Restart Repository. In the event of system recovery being needed, or of a system failure, a Restart Daemon reads information from the Restart Repository and recreates the process context. The Recovery Service is initialized and log data replayed to a Transaction Manager to determine the outcome of pending transactions. Failed objects and instances of the OTS are restarted.

Growing community of inventors

Bradford Abbas, United Kingdom

Iain Stuart Houston