International Business Machines Corporation

Michael Dennis McKeehan

Erik Edward Voldal

Teresa Chung Kan

Andre Tost

Steven Jay Munroe

Kathryn Ann Bohrer

Randy Dee Baxter

Mark Alan Pasch

Kenneth James Lawrence

The preferred embodiment provides an improved system and method for registration of Resource Managers with Transaction Managers in an distributed processing environment. The preferred system and method creates and stores a transactional resource in a container when the first execution method goes to the Resource Manager. The transactional resource represents the Resource Manager to the Transaction Manager. The transactional resource uses X/Open static registration procedures to inform the Resource Manager about the new transaction. The transactional resource is then registered to the Transaction Manager. In this way, only those Resources Managers that are involved in a transaction are registered and made known to registered to the Transaction Manager. Additionally, because static registration procedures are used, the Transaction Manager maintains control of the transaction

Efficient registration for distributed transaction systems

An access mechanism and method for accessing objects in a distributed object system manages object accesses and causes all accesses within one transaction to be to either the home object or the local copy, whichever is accessed first. When an object is accessed for the first time in a given transaction, the requested access is granted. For example, if home access is requested to an object in a different process, a proxy is created to access the object in its home location. When the object is subsequently accessed within the same transaction, the access mechanism ensures that the same access is used to assure that changes are not being made to a home object and a local copy or to more than one local copy simultaneously. In an alternative embodiment an exception may be generated if the requested access cannot be provided.

Object-oriented apparatus and method for controlling accesses to objects in a distributed object environment

According to the present invention, an apparatus and method for creating new objects &ldquo;near&rdquo; existing objects is disclosed. In a preferred embodiment of the present invention, a desirable location for the new object is determined by making a series of observations and system level decisions. By examining the system parameters and creating new objects in physical locations where other, related objects currently reside, system performance in object-oriented systems can be greatly increased.

Object-oriented apparatus and method for determining new object location relative to an existing object

A method and computer program product are provided for implementing pushdown queries in a distributed object management system. A pushdown query to a system datastore is performed for a query type returning a single object. Responsive to the system datastore finding the match, checking whether the match refers to an object changed in the current transaction is performed. Responsive to the match not referring to a changed object, the object is returned. Responsive to the match referring to the changed object and the changed object matching the pushdown query, the changed object is returned. Responsive to the system datastore not finding the match, a list of changed objects in a current transaction is obtained. Each of the changed objects are in a current transactional state. An object query is performed on the changed objects in the list of changed objects. A multiple object pushdown query to the system datastore is performed for a query type returning multiple objects. Then the list of changed objects in the current transaction is obtained and the object query is performed on the changed objects. Results of the multiple object pushdown query and object query are merged and returned.

Method and computer program product for implementing pushdown query in a distributed object management system

A system, method, and apparatus for ensuring data integrity in a distributed object-oriented transaction processing environment, including support of single- and two-phased commit protocol transactions with a new protocol defined as a mixed-phase commit protocol. A root transaction manager on a server registers distributed object resources requested by a client application for a global transaction as being committable by either the single-phase, two-phase, or mixed-phase protocol. The root transaction manager commits the registered resources in accordance with the results of the registration step.

System and method for supporting mixed-phase transactions in an

An object-oriented framework mechanism for persistent storage systems provides an infrastructure that embodies the steps necessary for a framework consumer (i.e., user) to define persistent storage for any type of data not supported in an object-oriented system by extending the framework to fit a particular persistent storage environment. Certain core functions are provided by the framework, which interact with extensible functions. A user may thus define extensible functions that allow the framework to support many different types of persistent data stored in datastores capable of storing the persistent data.

Object-oriented framework mechanism for providing persistent storage

An object-oriented mechanism is disclosed that allows new configuration data to replace existing configuration data within an existing object-oriented program. The new configuration data allows an OO program to be quickly and easily generated from an existing OO program without manually changing the source code of the existing OO program. When a factory object creates an object in the existing OO program, the new configuration data that defines a modified class is used to create the object. In this manner class substitution or redefinition in an OO program is easily accomplished, thereby allowing a new OO program to be easily generated from an existing OO program (or framework).

Object-oriented apparatus and method for controlling configuration of

A system, method, and apparatus for enabling a thin client to participate in a global transaction in a distributed object-oriented transaction processing environment that commits resources according to a two-phased commit protocol. The thin client is configured with a pseudo-transaction manager (PTM), and a remote server managing the commit procedure is configured with an object transaction manager having an interface to the (PTM). When an application on the thin client sends a request to begin a transaction, the PTM creates a temporary propagation context including a Global ID identifying the transaction and sets a flag in the context to indicate that this is a new transaction. The context is sent to a remote server for execution of a remote method. Upon receipt, the remote server recognizes that this is a new transaction and creates a real propagation context including its Resource Coordinator Proxy ID, the global ID, and a Recovery Coordinator Name useful for a recovery process in the event of transaction failure. The real context is replied to the PTM, which updates and replaces its temporary context with the real context. The real context is then sent to any downstream remote server participating in the global transaction, and each (Subordinate) registers to the Resource Coordinator identified in the context. The real context containing the Global ID generated by the thin client is used by the PTM for requests to any servers involved in the transaction, while the remote server manages the two-phase commit procedure.

Growing community of inventors

Rochester, MN, United States of America

Michael Dennis McKeehan