Configuration Maintenance for Distributed Applications Management

The MANDAS project has defined a layered architecture for the management of distributed applications. In this paper we examine a vertical slice of this architecture, namely the management applications and services related to configuration management. We introduce an information model which captures the configuration information for distributed applications and discuss a repository service based on the model. We define a set of services and management applications to support maintenance of configuration information, and describe how the different types of configuration information are collected. Finally, we present two management applications that use configuration information.     

基于组件的计算机辅助工艺规划与管理系统

本文介绍了一个基于组件的计算机辅助工艺规划与管理系统（CAPPM），包括：工艺规划、技术文档、产品结构和数控程序管理子系统．系统采用基于Web的Windows DNA结构，建立了一组包括外观类、业务逻辑类和数据库访问类的业务逻辑组件．当外部环境变化时，用户可根据实际需求，定制满足生产要求的CAPPM系统，提高了系统的重用和重构能力．系统采用可扩展标记语言XML通讯，增强了Web环境下系统信息交互的性能．目前，CAPPM系统正在沈阳第一机床厂应用．     

基于组件和设计模式的仓库系统框架

本文从仓库管理的需求出发，应用软件的组件和设计模式思想，设计实现了一个仓库的框架．该框架提供了仓库管理的仓库结构、仓库创建、业务管理、仓库分析和控制等基础功能．使用本框架所设计的组件和服务，通过具体应用的配置和简单扩展，可以高效高质量地建立起多层体系结构的仓库应用系统．本文的框架已经在实际仓库系统中获得应用．     

An architecture for managing virtual circuit and virtual path services in ATM networks

ATM networks rely on the Virtual Circuit (VC) and Virtual Path (VP) concepts to provide unicast connection-oriented services with Quality of Service (QoS) guarantees. This paper presents a model for managing the configuration and performance of the VC and VP services in these networks. The model consists of a connection management architecture that provides the services and is instrumented for network management purposes, and a network management architecture that uses the OSI management model to provide access to the appropriate service monitoring and control functions. The network management architecture proposes complete managed object definitions that achieve a variety of monitoring and control objectives: service configuration, service performance at the call and cell level, and service control. The latter includes the capability to establish VPs and control their allocated networking capacity and also control parameters of the signaling system that affect the performance of the VC service. The architecture was implemented in its entirety on the Xunet ATM testbed, and several experiments were conducted to illustrate the trade-off between the throughput of the VC service and the allocation of capacity to VPs. The experiments further demonstrated that the signaling system can create throughput bottlenecks in the absence of VPs in the network, and therefore, the network operator can increase performance by controlling the VP distribution.     

Network-aware service placement and selection algorithms on large-scale overlay networks

Currently many service providers offer their services on a private and proprietary hard- and software infrastructure. These infrastructures often share many similarities. Hence we believe a generic service management architecture, that allows service providers to offer a large array of different services on a single infrastructure or multiple providers to offer their services cooperatively, would provide many advantages over current silo-based approaches. Additionally, by allowing the distributed service management components to cooperate in a peer-to-peer overlay network, scalability and resilience of the system could be greatly improved.In this paper we propose an optimal algorithm, based on an integer linear programming (ILP) formulation, and several heuristics to support such a generic overlay-based service management architecture. More specifically, we propose algorithms for dynamically allocating server and network resources to a set of services and selecting a suitable service instance for each client. Service instances are placed on a set of servers, taking into account server resource constraints (e.g. CPU and memory). Unlike existing algorithms for this problem, those proposed in this paper also support service level agreements (SLAs), which take the form of Quality of Service demands such as transmission latency constraints and bandwidth requirements. The optimisation goal is to maximise the percentage of satisfied demand (answered requests) and minimise the total number of required overlay servers, while satisfying the SLAs and resource constraints. Additionally, we propose an extension that allows the algorithms to find overlay routing paths to improve the transmission latency for latency-sensitive services.Extensive simulations were performed to evaluate the performance and scalability of the heuristics. They showed that in many cases the heuristics perform close to optimal and they scale well in terms of network size.     

支持演化的Web服务框架研究

经过多年的研究和实践,软件配置管理已经成为一种成熟的软件开发规范和技术。然而对于基于Web服务的EAI(企业应用集成)来说,这依然是一个难题。论文提出了一个支持服务演化的Web服务框架。这个框架引入基于服务项的权限控制和动态服务配置管理来构成整个面向EAI的Web服务系统。这样,EAI环境中的各Web服务就可以在系统的配置管理支持下进行演化。     

Active Robust Resource Management in Cluster Computing Using Policies

We present an implementation of a policy-based management architecture for emerging communications and computing paradigms such as Active Networks and the Grid. To manage such open, highly distributed and decentralized environments, an approach based on policy concepts is adopted, allowing support for active, dynamic adaptability in network elements, services and end-user applications, as well as achieving decentralization and distribution. We present our flexible, extensible policy and event specifications in XML, and describe our management architecture. One key feature of our approach is the distributed infrastructure: the Directory and the Management Information Distribution system. The second feature is the Resource and Security Management elements residing on the multi-node managed systems. These combine to provide a light-weight, self-organizing management architecture. As an applications example, we describe the implementation of our management system applied to the Application Level Active Networking (ALAN) environment, implemented in the European Commission Information Society Technologies (IST) project ANDROID.     

基于移动Agent的特种无线网络管理仿真建模

本文将移动Agent技术和分布式网络管理技术应用于保障特种作战的无线网络中,提出了一种基于移动A-gent的新型无线网络管理模型。该模型具有良好的可伸缩性,具备一定的抗干扰和抗毁能力。根据此模型构建了诸军兵种特种联合作战概念仿真系统,为移动Agent技术应用于特种作战网络环境以及其他战场环境中的可行性和优越性提供了定性定量分析的依据。     

Towards integration of service and network management in TINA

The Telecommunications Information Networking Architecture (TINA) defines a framework to support the rapid and flexible deployment and management of a wide range of multi-media, multi-party services in a multi-vendor telecommunications environment. The TINA approach applies opendistributed processing (ODP) and object-oriented design techniques to specify the control and management of the telecommunications services and infrastructure. Management in TINA is applied to the different components of the architecture, services and resources, and to thedistributed processingenvironment (DPE) that provides distribution transparencies and communication capabilities among TINA components. Management in TINA is based on TMN and extended with ODP concepts, as TINA is not concerned with just network management, but also systems management. TINA management architecture addresses aspects of distribution, interoperability, dynamic manager/managed roles, and integration with service control functions. TINA service management concerns different activities of the service life-cycle, from four main aspects: access session management, service session management, user session management and communication session management. The TINA network resource model supports requirements from both network management activities and service connectivity needs.     

Analyzing the effectiveness of fault-management architectures in layered distributed systems

Fault management infrastructure in distributed systems includes manager processes and agents with various kinds of interactions for monitoring and surveillance of the status of the application software and hardware. The system architecture now includes these additional components and interactions, and they affect the system availability. This paper describes an architecture model called MAMA (Model for Availability Management Architecture) with an architecture definition language MAMA-dl for the combination of the application and management parts, and its analysis. The analysis extends the Fault Tolerant Layered Queueing Model to account for propagation of knowledge of the system state in the management sub-architecture. The model is demonstrated on a problem of placement of manager tasks in a system.     

The evolution support environment system

The evolution support environment (ESE) system, which provides a framework for capturing and making available semantic information about software components of an evolving software system, is described. The goal in the design of the ESE system was to provide integrated support for management of software architecture configuration, life-cycle configuration, and version control. Software architecture configuration management allows tracking of interconnections among software components that make up a system. Life-cycle management allows traceability among specifications, design, code, and test cases during software development. Adding version control allows specific versions of software objects and their associated objects, such as specifications and test cases, to be retrieved. The authors' experience with the use of the system is discussed     

Web-Based Customer Management of VPNs

The use of Virtual Private Networks (VPNs) is one of the major trends in the integrated broadband communications environment. Currently, the control and management of VPN resources is mainly supported by the provider of the bearer telecommunication services, and VPN customers have no control over these resources. The increasing importance of the broadband communication infrastructure in corporate operations and transactions is stressing the requirement for a customizable configuration, operation and management of VPN services. First, this paper discusses the evolution of VPN environments towards customized VPN configurations and goal-driven management of these VPNs. VPN service characteristics and management requirements are analyzed. Then, the paper introduces the proposed customer management architecture satisfying these requirements. The architecture is based on the multi-level virtualization of network resources through the partitioning of resources in the provider's shared communication infrastructure and the dynamic allocation of these resources to customers. A Web-based distributed approach is used for implementing the proposed customer management of VPNs.     

基于产品结构与配置管理为核心的PDM体系结构

在分析现行PDM的体系结构及其应用推广中存在的问题的基础上，提出了PDM的一种新的研究思路——面向企业的产品结构与配置管理(EOPSCM)。研究了EOPSCM的3层架构及其功能、协同工作环境的构建及其支持，并从应用集成和技术路线两个方面对EOPSCM系统集成进行了相关分析。     

Managing service level agreements in Premium IP networks: a business-oriented approach

This paper presents a market-enabling framework where users, content providers and network operators can interact in the seamless, transparent sale and delivery of a wide range of services. The framework allows for dynamic creation, configuration and delivery of services with quality assurance, via automated management of Service Level Agreements (SLAs). We propose an approach relying on a systemic treatment of business, service and network layer issues, which translates into a layered architecture where components belonging to different levels interact on the basis of a mediation paradigm. We use mediation as a generic term for a combination of negotiation, brokerage and state notification, jointly concurring to the realization of the entire life-cycle of a service.     

A model-driven framework for enterprise service management

With a steady pace of adoption of service-oriented architecture, enterprises have made significant progresses in implementing various kinds of Web services and converting existing applications to service-oriented architecture. As a significant number of services have been put into actual use, many service-oriented enterprises are faced with the problem of how to manage these services efficiently. In this paper, we propose a model-driven framework for a more efficient management of these services. In this framework, the creation and maintenance of enterprise integration solutions are modeled by flows, finite state machines (FSMs), role-based access control (RBAC) among other formal systems models as well as appropriate decision models. For instance, each enterprise integration solution would be modeled as composite services that can be described by respective flow, FSM and RBAC models. These solution models can then be stored, and later retrieved for the execution of these composite services. Furthermore, formal systems and decision models are also used to maintain and update these service-oriented solutions to improve the efficiency and quality of service management by taking advantage of the underlying service-oriented architecture.     

A Software Agent Architecture for Network Management: Case Studies and Experience Gained

Current Network Management paradigms are rigid and lack flexibility. This makes the task of managing a highly evolving and dynamic network difficult to cope with. This paper presents the results of our work on Agent technology as a new paradigm for developing Network Management applications. First, we present our agent architecture that is built in a way that allows the agent to acquire new capabilities at runtime. Second, we present two case studies implemented with a prototype of this agent architecture. The first case study consists of an agent system in which faulty agents are automatically detected, their tasks then being reallocated to other agents, thus providing a fault-tolerant management system. The second case study deals with the configuration of heterogeneous ATM networks to establish end-to-end permanent virtual channels. Finally, we evaluate our agent architecture and the agent paradigm in general when applied to Network Management.     

基于对象Petri网的配置管理系统模型研究

提出用对象Petri网对结构管理和版本管理中配置项的状态变化情况进行描述，并结合已有的对工作流程的描述，使配置管理有一个统一的模型，分析配置管理系统的结构以及它在整个CASE系统中的地位和作用，根据配置项在数据库中的进化情况，详细分析配置管理过程中的数据流动情况，最后提出一种采用三层C／S,基于CORBA进行集成配置管理体系结构，这有利于提高系统的开发性和可扩展性。     

Internet Based Reconfigurable Architecture for CAPP Development and Customization

To realize the abilities of reconfiguration, flexibility and integration with other enterprise applications, Intemet/Intranet based CAPP architecture is presented in this paper, The architecture should be implemented for certain special domain to form the domain process planning framework and the domain framework could be developed to practical enterprise CAPP application. With regard to the characteristic of product family process planning in certain specialty domain, the CAPP applications are customized based on the framework derived from the architecture. The architecture has the colranon functions and services process planning. The architecture generalizes traditional functions and services into components, such as the guidance of process indexing and process variation, resource management and so on. These functions are supplied in the form of web services. In .the mean time, the data interfaces needed for integration are defined and implemented with XML technology, The customization of CAPP framework to eleetromotor product family based on the architecture, and CAPP application system for specifically electromotor enterprise based on the framework is illustrated,     

架构软件配置管理模型

软件架构是设计实现大规模软件的基础,并且追踪和控制软件架构的演化是十分必要的。但是许多传统的软件配置管理工具将软件仅看做一个文件集合,而不是一个架构,这造成软件设计领域（架构层）与软件配置管理领域（文件层）的脱节。提出了软件架构配置管理模型,它可以对软件架构进行版本控制和配置管理。     

Supporting Cooperative Software Processes in a Decentralized and Nomadic World

Recent advances in wireless networks enable decentralized cooperative and nomadic work scenarios where mobile users can interact in performing some tasks without being permanently online. Scenarios where connectivity is transient and the network topology may change dynamically are considered. Connectivity among nodes does not require the support offered by a permanent infrastructure but may rely on ad hoc networking facilities. In this paper, a scenario in which a nomadic group of software engineers cooperate in developing an application is investigated. The proposed solution, however, is not software process specific but holds for other cases where shared documents are developed cooperatively by a number of interacting nomadic partners. Support tools for these groups are normally based on a client-server architecture, which appears to be unsuitable in highly dynamic environments. Peer-to-peer solutions, which do not rely on services provided by centralized servers, look more promising. This paper presents a fully decentralized cooperative infrastructure centered around peer-to-peer versioning system (PeerVerSy), a configuration management tool based on a peer-to-peer architecture, which supports cooperative services even when some of the collaborating nodes are offline. Some preliminary experiences gained from its use in a teaching environment are also discussed