Unisys Corporation

Norman Roy Smith

Mark Joseph Rentmeesters

J Calvin Hale

James Albert Fontana

Anthony Reginald Pitchford

Sridhar Srinivasa Iyengar

Brian Edward Pattinson

Mireille Mathilde Staub

Lev Smorodinsky

Douglas Marshall Tolbert

Andrew David Milligan

Prabhakar Krishnamurthy Vellore

The method of the present invention is useful in a computer system including at least two server nodes, each of which can execute clustered server software. The program executes a method for monitoring failure situations to reduce downtime. The method includes the step of detecting an event causing one of the failure situations, and then the method determines if the event affects one of the server nodes. If it is determined the event does affect one of the server nodes, the method then determines if the event exceeds a threshold value. If it is determined the event exceeds a threshold value, the method executes a proactive failover. If the event is not specific to a cluster node, but indicates an impending or actual failure of the cluster software, the method identifies and initiates an appropriate action to fix the condition or provide a workaround (if available) that will preempt an impending failure of the cluster system or would enable a restarting of a failed cluster software.

Proactive method for ensuring availability in a clustered system

An estimator program is disclosed which performs method steps for estimating the availability of an application program that runs on any computer in a cluster of at least two computers. By the availability of an application program is herein meant the probability that at any particular time instant, at least one of the computers in the cluster will actually be servicing requests from external workstations to use the application program. In one embodiment, the estimator program begins by receiving input parameters which include 1) multiple downtime periods for each computer in the cluster that occur at respective frequencies due to various downtime sources, and 2) an application failover time period for switching the running of the application program from any one computer to another. From those input parameters, the estimator program estimates first and second annual stoppage times, and then determines the availability of the application program on the cluster from the sum of the first and second annual stoppage times.

Estimator program for estimating the availability of an application program that runs in a cluster of at least two computers

In a heterogeneous computer system including at least one Client CPU, at least one Server CPU and a common memory disposed therebetween for storing first and second operating systems that control operation of the Client and Server CPUs, respectively. There is provided Client and Server Programs, both of which are stored in the same common memory. The Client Program is executed by the Client CPU and the Server Program is executed by the Server CPU. A method and system is disclosed wherein the Server Program is adapted for making function calls to the Client Program and the Client Program is adapted for returning results of the called function to the Server Program. The Server Program includes Procedures for invoking a Client Program function, converting parameters and result data from a format compatible with the first operating system to one compatible with the second operating system.

System and method for performing external procedure calls from a server program to a client program while both are running in a heterogeneous computer

There is provided a system and method in a heterogeneous multiprocessing system for performing external procedure calls from a Client Program to a Server Program, both of which are stored in a common memory. The Client Program is executed by a first CPU under control of a first operating system and the Server Program is executed by a second CPU under control of a second operating system. The first and second operating systems are also stored in the common memory. The Client Program includes a Proxy Procedure for invoking a Server program function, and a Stub Procedure for converting parameter and result data from the first to the second operating system. The Client Program further includes a Protocol Procedure for passing data between the Client and Server CPUs.

System and method for performing external procedure calls from a client program to a server program while both are operating in a heterogenous computer

A system and method in a computer system for integrating software development tools and applications into the computer system in order to build, deploy and maintain enterprise business process applications in a heterogeneous development framework. Integration of the applications and software development tools are achieved through integration of the key elements of the computer system which are business models, domain models and components. In the process of integration the origin of a first newly developed/modified/existing business model is traced to a first newly developed/modified/existing domain model and these models are linked together. Next, the constituent components of a second newly developed/modified/existing domain model are traced to a newly developed/modified/existing set of components created and linked together. The system also involves recovery of constituent components from a newly developed/modified/existing system in a first heterogeneous environment and those constituent components are reconstructed into usable components inside a third newly developed/modified/existing domain model and are linked together. The process also involves recovery of a fourth newly developed/modified/existing domain model from a second heterogeneous environment and linking it to a second newly developed/modified/existing business model.

Software system development framework

There is provided a method in a heterogeneous computer system having at least two CPU's accessing a common memory, which memory has stored therein at least two distinct operating systems. Client and Server Programs are also stored in the common memory. The Client Program is adapted for making function calls to the Server Program and the Server Program is adapted for returning results of the called function to the Client Program. Moreover, the Server Program is adapted for making function calls back to the Client Program and for receiving results therefrom. The Client Program includes procedures for invoking a Server Program function, for converting parameters and result data from a format compatible with the first operating system to one compatible with the second operating system and for passing data between the Client CPU and the Server CPU. The Server Program includes Procedures for invoking a Client Program function and for converting parameters and result data from a format compatible with the second operating system to one compatible with the first operating system.

System and method for performing external procedure calls from a client

A method is disclosed for performing function calls from a first program operating under control of a first operating system running on a first CPU; to a second program operating under control of a second operating system running on a second CPU. The method operates in a heterogeneous multiprocessing system having a common memory accessible by each of the CPU's and disposed for storing the two different operating systems that actively run and control resources of the system. The method begins by initiating the second program. The first program then makes calls to the second program to perform a specific function while passing parameters thereto for processing according to the specific function. The second program processes the parameters according to the function; and, converts the results from a format compatible with the second program to a format compatible with the first program. The second program reactivates the first program for receipt of the results and once received the first program signals the second operating system to terminate operation.

System and method for performing external procedure calls in

A programmed computer system transforms a distinctive representation of a business model into a generic representation format, such as the Unified Modeling Language ('UML') object model. The system also transforms legacy business processes, including legacy applications into UML format. The UML format of the business model and legacy components are stored in a central repository. The system also allows the reverse engineering and reverse transformation of UML models into a distinctive representation of business models and application components. The transformation of business model information into a UML model is achieved by identifying the differences between these models and creating a bidirectional mapping of the differences. The system also allows for selective movement of objects and models between business process models and UML. In other words, a user may select individual objects to be moved between models.

Software development tool to accept object modeling data from a wide

A programmed computer system includes a set of development tools, each having a format used to store data and code files. The output data from a developmental tool is transformed into a generic format data which is saved in a repository. The repository also contains all output data, application components, and information as to the relationship between the entities and objects stored in the repository. Each tool employed during the development process puts information into the repository and takes information out of the repository. In this way, the system integrates the tools used in different parts of the development process by passing necessary information from one tool to another. Different tools are employed through each of the development stages, legacy integration, enterprise modeling, domain modeling, writing and editing of business logic, generating skeleton code, component building and wrapping and application deployment.

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Lake Forest, CA, United States of America

Norman Roy Smith