Xholon runtime framework Xholon runtime framework executes applications that are event-driven or that have highly dynamic structure or behavior.
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Xholon runtime framework Description

Xholon runtime framework executes applications that are event-driven or that have highly dynamic structure or behavior. Xholon runtime framework executes applications that are event-driven or that have highly dynamic structure or behavior. Specify your models using XML and Java, or using third-party UML2 tools and MDA transformations. To get started, read or actively work through the basic HelloWorld tutorial. It's a very simple application, but it demonstrates many of the main concepts. For more detail on the concepts behind Xholon, you might want to read one of the papers that's been published. These describe how to model cells and other complex biological entities using tools designed for developing real-time and embedded systems.This earlier work used Rational Rose RealTime and C++, rather than the current Java. Xholon is intended to be a runtime framework that can execute the same types of systems described in those papers, plus many more traditional non-biological event-driven systems.The goal of the Cellontro sister project is to develop complex biological simulations using the Xholon framework. Most of the features described in the published papers have been re-implemented as Cellontro applications using Xholon. Also have a look at the sample applications that are included with the Xholon software. These give an idea of the range of applications that can be supported by the Xholon runtime framework.These have been employed as use cases to determine what functionality is most important in Xholon. The digital watch simulation is a good example of a Xholon application with a hierarchical state machine, developed using a UML modeling tool.A Xholon is essentially a holon. A holon is an entity that lives within a hierarchical structure, and is both a whole and a part at the same time. In mainstream computer science terms, a Xholon is a node in a tree. The node has a single parent, possibly one or more children, and possibly one or more siblings. A Xholon may also be an active agent able to interact in real-time with other Xholons in the tree. In UML2 terminology, a Xholon is a structured classifier that may exist as a part within other structured classifiers, and that may in turn contain other structured classifiers as parts of itself. The result is a hierarchical containment structure, nested to an arbitrary number of levels.As a part, a Xholon plays a specific role within another structured classifier. Xholons are UML classes that are subsequently refined using UML2 composite structure diagrams. Structured classifiers interact with each other through ports, by passing messages or by making function calls. Using the more philosophical terminology used to describe holons, a Xholon is something that is simultaneously both a whole and a part. Since everything in the universe is a holon, then everything running within a computer application should be a Xholon. The term holon was invented by Arthur Koestler in 1967. The Xholon Project is inspired by biological concepts. A major incentive behind the project is to build a run-time environment that is equally adapted to running simulations of biological systems, and to running more traditional real-time, embedded and other event-driven reactive systems. Xholon applications may contain structures that are highly mutable. A Xholon is an active agent that can modify the tree structure in which it lives. It can navigate the tree to interact with any other node, it can add, delete or modify other nodes, it can exchange messages with other nodes, and it can move itself to another position within the tree. The Xholon Project incorporates many concepts of the Real-time Object-Oriented Modeling (ROOM) methodology, much of which has been incorporated into UML2. At the same time, Xholon removes some of the limitations of ROOM to allow for greater flexibility, mutability and mobility of active objects. The Xholon run-time can serve as a target for a Model Driven Architecture (MDA) transformation pipeline. MDA stresses the importance of models, and the ability to transform those models, through a series of steps, into an executing target system. You can create your model using a UML tool such as Gentleware's Poseidon or NoMagic's MagicDraw, save the model as an XMI file, transform it using XSLT (or by some other MDA means) into a Xholon model and application, and then execute the model.What's New in This Release:· The new Xholon Eclipse plugin is a UML/SysML/FSM (Finite State Machine) simulation environment.· The plug-in transforms your MagicDraw and Topcased (UML) model into Java and XML, compiles, and immediately executes it.· It also partially works with Poseidon, Topcased (SysML), and ArgoUML.· Viewers provide runtime animation of state machines, sequence diagrams, and timing diagrams.· There is initial support for export of models to Quantum Event Processor, State Machine Compiler, and State Chart XML formats.· The full Xholon tool includes all of the above functionality, plus much more.

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