Rapid Real-Time Interdisciplinary Ocean Forecasting Using Adaptive Sampling and Adaptive Modeling and Legacy Codes: Component Encapsulation Using XML

Abstract. We present the high level architecture of a real-time inter-disciplinary ocean forecasting system that employs adaptive elements in both modeling and sampling. We also discuss an important issue that arises in creating an integrated, web-accessible framework for such a system out of existing stand-alone components: transparent support for handling legacy binaries. Such binaries, that are most common in scien-tific applications, expect a standard input stream, maybe some command line options, a set of input files and generate a set of output files as well as standard output and error streams. Legacy applications of this form are encapsulated using XML. We present a method that uses XML doc-uments to describe the parameters for executing a binary.

OVERLAPPING OPTIMIZATION WITH PARSING THROUGH METAGRAMMARS

ABSTRACT This paper describes techniques for improving the performance of meta framework developed by combining C++ and Java language segments through reducing the number of bytecodes generated. Augmented versions of existing languages can be developed by combining good properties of those languages. It increases the flexibility of programmers in using language constructs of those languages. The framework identifies and parses source code with C++ and Java language statements using metagrammar developed and create a unified AST for the hybrid source code. Bytecodes are generated for AST and interpreted. The performance of Bytecodes can be improved through optimization techniques associated with metagrammars, like constant propagation which identifies constant values for variables and propagate it to the place where the variable occurs and replace it with corresponding value. Function inlining and exception optimization greatly improves the execution time performance of Bytecodes. Optimization through metagrammars eliminates rigorous analysis of bytecodes to identify hot spots and optimize them

WIEDERGEWINNUNG VON WEB SERVICES AUS VORHANDENEN ALTSYSTEMEN

Dieser Beitrag beschreibt einen Werkzeugkasten für die Ableitung von Web Services aus bestehenden COBOL Programmen auf dem IBM Mainframe. Das erste Werkzeug - COBAudit – dient dazu potentielle Web Services zu identifizieren. Das zweite Werkzeug -COBStrip – markiert den Programmpfad zum gewünschten Ergebnis und kommentiert den Rest des Codes aus. Das dritte Werkzeug - COBWrap – kapselt den ausgewählten Codebaustein und transformiert ihn in eine ausführbare Komponente. Das vierte Werkzeug – COBLink – verbindet die gekapselte Komponente mit dem Web über eine WSDL Schnittstelle. Die Werkzeuge werden zurzeit an einem großen Bausparsystem mit 12 Millionen COBOL Anweisungen erprobt. Der Beitrag beschreibt den Stand dieser Arbeit relativ zum allgemeinen State of the Art auf dem Gebiet

On the effect of exploiting gpus for a more Eco-sustainable lease of life

It has been estimated that about 2% of global carbon dioxide emissions can be attributed to IT systems. Green (or sustainable) computing refers to supporting business critical computing needs with the least possible amount of power. This phenomenon changes the priorities in the design of new software systems and in the way companies handle existing ones. In this paper, we present the results of a research project aimed to develop a migration strategy to give an existing software system a new and more eco-sustainable lease of life. We applied a strategy for migrating a subject system that performs intensive and massive computation to a target architecture based on a Graphics Processing Unit (GPU). We validated our solution on a system for path finding robot simulations. An analysis on execution time and energy consumption indicated that: (i) the execution time of the migrated system is less than the execution time of the original system; and (ii) the migrated system reduces energy waste, so suggesting that it is more eco-sustainable than its original version. Our findings improve the body of knowledge on the effect of using the GPU in green computing. © 2015 World Scientific Publishing Company

Developing Legacy System Migration Methods and Tools for Technology Transfer

This paper presents the research results of an ongoing technology transfer project carried out in coopera- tion between the University of Salerno and a small software company. The project is aimed at developing and transferring migration technology to the industrial partner. The partner should be enabled to migrate monolithic multi-user COBOL legacy systems to a multi-tier Web-based architecture. The assessment of the legacy systems of the partner company revealed that these systems had a very low level of decompos- ability with spaghetti-like code and embedded control flow and database accesses within the user interface descriptions. For this reason, it was decided to adopt an incremental migration strategy based on the reengineering of the user interface using Web technology, on the transformation of interactive legacy programs into batch programs, and the wrapping of the legacy programs. A middleware framework links the new Web-based user interface with the Wrapped Legacy System. An Eclipse plug-in, named MELIS (migration environment for legacy information systems), was also developed to support the migration process. Both the migration strategy and the tool have been applied to two essential subsystems of the most business critical legacy system of the partner company

Bridging the Gap between Legacy Services and Web Services

International audienceWeb Services is an increasingly used instantiation of Service-Oriented Architectures (SOA) that relies on standard Internet protocols to produce services that are highly interoperable. Other types of services, relying on legacy application layer protocols, however, cannot be composed directly. A promising solution is to implement wrappers to translate between the application layer protocols and the WS protocol. Doing so manually, however, requires a high level of expertise, in the relevant application layer protocols, in low-level network and system programming, and in the Web Service paradigm itself. In this paper, we introduce a generative language based approach for constructing wrappers to facilitate the migration of legacy service functionalities to Web Services. To this end, we have designed the Janus domain-specific language, which provides developers with a high-level way to describe the operations that are required to encapsulate legacy service functionalities. We have successfully used Janus to develop a number of wrappers, including wrappers for IMAP and SMTP servers, for a RTSP-compliant media server and for UPnP service discovery. Preliminary experiments show that Janus-based WS wrappers have performance comparable to manually written wrappers

Evaluating Legacy System Migration Technologies through Empirical Studies

We present two controlled experiments conducted with master students and practitioners and a case study conducted with practitioners to evaluate the use of MELIS (Migration Environment for Legacy Information Systems) for the migration of legacy COBOL programs to the web. MELIS has been developed as an Eclipse plug-in within a technology transfer project conducted with a small software company [16]. The partner company has developed and marketed in the last 30 years several COBOL systems that need to be migrated to the web, due to the increasing requests of the customers. The goal of the technology transfer project was to define a systematic migration strategy and the supporting tools to migrate these COBOL systems to the web and make the partner company an owner of the developed technology. The goal of the controlled experiments and case study was to evaluate the effectiveness of introducing MELIS in the partner company and compare it with traditional software development environments. The results of the overall experimentation show that the use of MELIS increases the productivity and reduces the gap between novice and expert software engineers

The encapsulation of legacy binaries using and XML-based approach with applications in ocean forecasting

Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.Includes bibliographical references (p. 85-87).This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.This thesis presents an XML-based approach for the encapsulation of legacy binaries. A method that utilizes XML documents to describe the various parameters and settings for the compilation and execution of an encapsulated binary is discussed. The binary is treated as a black-box component and the XML description for that binary contains relevant restrictions, such as input and output files and runtime parameters read in from the standard input stream. The proposed XML schema design constrains the aforementioned XML descriptions of binaries. The usage parameters for the binaries are expressed by such XML documents. A prototype system is then able to take any of these schema-conforming XML descriptions and display the relevant user controls in a graphical user interface (GUI). Instead of editing obscure script files, the user can make changes to build-time and runtime parameters for a binary using the presented system interface. After validating the user inputs, the system generates the required script files automatically and proceeds to compile and/or execute the binary. The Primary Equation Model binary of the Harvard Ocean Prediction System (HOPS) was successfully encapsulated using the presented approach. The customization and control of the binary's compilation and execution through a GUI was achieved.by Robert C. Chang.M.Eng

Migration d'interfaces utilisateurs textuelles de systèmes patrimoniaux vers le Web

Les interfaces utilisateurs détiennent une importance non négligeable dans tout logiciel applicatif, car elles constituent le premier contact entre les utilisateurs et le logiciel. La migration d'interfaces utilisateurs textuelles de systèmes patrimoniaux vers le Web vise à remédier les problèmes liés à l'accès limité de tels systèmes tout en améliorant l'aspect et la convivialité de ces interfaces. Fréquemment, cela implique à la fois le changement de la plate-forme d'exécution - d'une plate-forme textuelle vers une architecture Web - et la refonte complète des interfaces vers une technologie de présentation Web. Ce mémoire est une synthèse des méthodes et des techniques de migration d'interfaces utilisateurs textuelles vers le Web. Nous y abordons, dans un premier temps, les notions reliées aux systèmes patrimoniaux et au Web. Cela permet d'établir le contexte de notre étude à savoir l'environnement de départ et l'environnement cible dans une migration d'interfaces utilisateurs vers le Web. Dans un deuxième temps, nous exposons différentes techniques et approches de migration d'interfaces utilisateurs. Finalement, nous terminons notre présentation avec trois exemples de plates-formes de migration d'interfaces utilisateurs