Browsing by Author "Neal, Radford"

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    JADE: a distributed software prototyping environment
    (1983-04-01) Witten, Ian H.; Birtwistle, Graham M.; Cleary, John; Hill, David R.; Levinson, Danny; Lomow, Greg; Neal, Radford; Peterson, Murray; Unger, Brian W; Wyvill, Brian
    The Jade research project is aimed at building an environment which comfortably supports the design, construction, and testing of distributed computer systems. This note is an informal project description which delimits the scope of the work and identifies the research problems which are tackled. Some design issues are discussed, and progress to date is described.
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    JADE: a simulation & software prototyping environment
    (1983-11-01) Unger, Brian W; Birtwistle, Graham; Cleary, John; Hill, David; Lomow, Greg; Neal, Radford; Peterson, Murray; Witten, Ian; Wyvill, Brian
    Jade provides an integrated set of tools which are designed to support the development of distributed software and systems. The Jade environment provides tools for the design, implementation, debugging, testing, maintenance, and performance analysis of distributed, concurrent programs. Novel features of Jade are that it is based on the modelling and simulation of target distributed systems and partially automatic program generation is supported. The goals of Jade are to provide a cost effective software development environment that is both easy and comfortable to use, and which can produce more reliable, maintainable programs. This paper presents an overview of the Jade environment, describes its major components, and outlines the status of the project.
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    VISUALISING A SIMULATION USING ANIMATED PICTURES
    (1983-11-01) Birtwistle, Graham; Wyvill, Brian; Levinson, Danny; Neal, Radford
    We examine an application of Jaggies, a 2D graphics system designed as part of the Jade software prototyping environment. The Jade research project is aimed at building an environment which comfortably supports the design, construction, and testing of distributed computer systems. Jaggies is based on a hierarchical data structure and avoids storage of large picture files. In this application, Jaggies provides versatile support for the graphical display of the state of the Andes simulation interpreter. Jaggies pictures are represented as linked lists of objects. An object describes an instance of a picture or a primitive. The Jaggies data structure is accessed via a set of procedures which may be called from an application program. Some of the more unusual features of Jaggies are: the system maintains an internal model of the display which may be altered incrementally; the system may be distributed across several processors; and recursively structured pictures may be defined. In Andes a simulation running on a host machine communicates with one or more Jaggies programs running on a Jade graphics workstation using Jade Inter Process Communication (JIPC). The user first goes through a design phase in which graphical icons are defined to represent specific entities in the simulation. These icons are represented in a compact form as a Jaggies data structure which resides on the workstation. Simple real-time animation functions may also be specified. As the simulation progresses the icons appear when entities are created and move in accordance with commands from the simulation program. The user may interact with the graphics; for example, different views may be created and areas of interest may be re-scaled to show details. Andes is being implemented on a VAX/780 host machine and a Corvus Concept workstation.
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    VISUALISING A SIMULATION USING ANIMATED PICTURES
    (1983-11-01) Birtwistle, Graham; Wyvill, Brian; Levinson, Danny; Neal, Radford
    We examine an application of Jaggies, a 2D graphics system designed as part of the Jade software prototyping environment. The Jade research project is aimed at building an environment which comfortably supports the design, construction, and testing of distributed computer systems. Jaggies is based on a hierarchical data structure and avoids storage of large picture files. In this application, Jaggies provides versatile support for the graphical display of the state of the Andes simulation interpreter. Jaggies pictures are represented as linked lists of objects. An object describes an instance of a picture or a primitive. The Jaggies data structure is accessed via a set of procedures which may be called from an application program. Some of the more unusual features of Jaggies are: the system maintains an internal model of the display which may be altered incrementally; the system may be distributed across several processors; and recursively structured pictures may be defined. In Andes a simulation running on a host machine communicates with one or more Jaggies programs running on a Jade graphics workstation using Jade Inter Process Communication (JIPC). The user first goes through a design phase in which graphical icons are defined to represent specific entities in the simulation. These icons are represented in a compact form as a Jaggies data structure which resides on the workstation. Simple real-time animation functions may also be specified. As the simulation progresses the icons appear when entities are created and move in accordance with commands from the simulation program. The user may interact with the graphics; for example, different views may be created and areas of interest may be re-scaled to show details. Andes is being implemented on a VAX/780 host machine and a Corvus Concept workstation.