Web Auction System

Auctions are perhaps the oldest market places in history. For centuries, people were allowed to place a price on an item for sale. The person who pledged the highest amount won. Although there were no legal contracts and laws in place, the underlying concept remained the same; both buyer and seller gained something from the transaction. This Computer Science Masters project is aimed at designing an online auction system that is scalable, robust, and flexible to meet the increasing demands of secure and efficient transactions. This project proposes the use of a three-tier architecture system to conduct online auctions in order to ensure reliability, flexibility and scalability. The system uses HTML and JSP for the front end, WebLogic server as the middle tier, and Oracle as the backend database. This online auction system is built to ensure smooth and efficient transactions between buyers and sellers. This report describes the basic concepts underlying auctions, specifically online auctions. The report goes on to explain in detail the design and logic of the system by incorporating figures and screen shots for illustration

Automatic performance optimisation of component-based enterprise systems via redundancy

Component technologies, such as J2EE and .NET have been extensively adopted for building complex enterprise applications. These technologies help address complex functionality and flexibility problems and reduce development and maintenance costs. Nonetheless, current component technologies provide little support for predicting and controlling the emerging performance of software systems that are assembled from distinct components. Static component testing and tuning procedures provide insufficient performance guarantees for components deployed and run in diverse assemblies, under unpredictable workloads and on different platforms. Often, there is no single component implementation or deployment configuration that can yield optimal performance in all possible conditions under which a component may run. Manually optimising and adapting complex applications to changes in their running environment is a costly and error-prone management task. The thesis presents a solution for automatically optimising the performance of component-based enterprise systems. The proposed approach is based on the alternate usage of multiple component variants with equivalent functional characteristics, each one optimized for a different execution environment. A management framework automatically administers the available redundant variants and adapts the system to external changes. The framework uses runtime monitoring data to detect performance anomalies and significant variations in the application's execution environment. It automatically adapts the application so as to use the optimal component configuration under the current running conditions. An automatic clustering mechanism analyses monitoring data and infers information on the components' performance characteristics. System administrators use decision policies to state high-level performance goals and configure system management processes. A framework prototype has been implemented and tested for automatically managing a J2EE application. Obtained results prove the framework's capability to successfully manage a software system without human intervention. The management overhead induced during normal system execution and through management operations indicate the framework's feasibility

Design and Implementation of Multilevel Secure Database in Website

Multi-tier web server systems are used in many importantcontexts and their security is a major cause of concern.Such systems can exploit strategies. In this paper, a model was present based onthree-tier architecture (Client tier, Server tier and Database tier) and applying multilevel security on it. The database server tier consists of the DBMS or the database management system and the database and we built it off-line to reduce unauthorized access to sensitive data. The Client tier, which is usually a web browser, processes and displays HTML resources, issues HTML requests and processes the responses. These web browsers are HTTP clients that interact with the Web servers using standard protocols. The Middle or application server tier consists most of the application logic. Inputs receives from the clients and interacts with the database but only the results sent to application server then to client. This achieved by using multilevel of security to protect database, using Authorization, Password Encryption. The process of authorization done by allowing the access to proposed system pages depending on authorized level; Password encrypted using bcrypt with fallbacks on sha-256/512 with key stretching to protect it from cracking by any types of attack. Client-to-Application Server Protocol (CAP) uses the RC4A algorithm to provide data confidentiality to secure transmitted information from application server to client. Keywords: Authentication, Multi-tier model, Multi-Tier Security, Security, Data protection, Internet security

A Technology Proposal for a Management Information System for the Director’s Office, NAL.

This technology proposal attempts in giving a viable solution for a Management Information System (MIS) for the Director's Office. In today's IT scenario, an Organization's success greatly depends on its ability to get accurate and timely data on its operations of varied nature and to manage this data effectively to guide its activities and meet its goals. To cater to the information needs of an Organization or an Office like the Director's Office, information systems are developed and deployed to gather and process data in ways that produce a variety of information to the end-user. MIS can therefore can be defined as an integrated user-machine system for providing information to support operations, management and decision-making functions in an Organization. The system in a nutshell, utilizes computer hardware and software, manual procedures, models for analysis planning, control and decision-making and a database. Using state-of-the-art front-end and back-end web based tools, this technology proposal attempts to provide a single-point Information Management, Information Storage, Information Querying and Information Retrieval interface to the Director and his office for handling all information traffic flow in and out of the Director's Office

QoS control of E-business systems through performance modelling and estimation

E-business systems provide the infrastructure whereby parties interact electronically via business transactions. At peak loads, these systems are susceptible to large volumes of transactions and concurrent users and yet they are expected to maintain adequate performance levels. Over provisioning is an expensive solution. A good alternative is the adaptation of the system, managing and controlling its resources. We address these concerns by presenting a model that allows fast evaluation of performance metrics in terms of measurable or controllable parameters. The model can be used in order to (a) predict the performance of a system under given or assumed loading conditions and (b) to choose the optimal configuration set-up for certain controllable parameters with respect to specified performance measures. Firstly, we analyze the characteristics of E-business systems. This analysis leads to the analytical model, which is sufficiently general to capture the behaviour of a large class of commonly encountered architectures. We propose an approximate solution which is numerically efficient and fast. By mean of simulation, we prove that its accuracy is acceptable over a wide range of system configurations and different load levels. We further evaluate the approximate solution by comparing it to a real-life E-business system. A J2EE application of non-trivial size and complexity is deployed on a 2-tier system composed of the JBoss application server and a database server. We implement an infrastructure fully integrated on the application server, capable of monitoring the E-business system and controlling its configuration parameters. Finally, we use this infrastructure to quantify both the static parameters of the model and the observed performance. The latter are then compared with the metrics predicted by the model, showing that the approximate solution is almost exact in predicting performance and that it assesses the optimal system configuration very accurately.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Digital cockpits and decision support systems : design of technics and tools to extract and process data from heterogeneous databases

Tableau d'honneur de la Faculté des études supérieures et postdoctorales, 2006-200

Autonomous Recovery in Componentized Internet Applications

In this paper we show how to reduce downtime of J2EE applications by rapidly and automatically recovering from transient and intermittent software failures, without requiring application modifications. Our prototype combines three application-agnostic techniques: macroanalysis for fault detection and localization, microrebooting for rapid recovery, and external management of recovery actions. The individual techniques are autonomous and work across a wide range of componentized Internet applications, making them well-suited to the rapidly changing software of Internet services. The proposed framework has been integrated with JBoss, an open-source J2EE application server. Our prototype provides an execution platform that can automatically recover J2EE applications within seconds of the manifestation of a fault. Our system can provide a subset of a system's active end users with the illusion of continuous uptime, in spite of failures occurring behind the scenes, even when there is no functional redundancy in the system