基于反射的中间件QoS动态配置框架

提出一种基于反射的中间件服务质量（QoS）动态配置框架,在动态感知环境变化的基础上,利用QoS度量函数以及爬山算法寻找最佳资源配置,并采用反射机制动态调整中间件系统参数,以满足用户服务需求,从而实现系统在线性能的优化。仿真实验结果表明,该框架是有效的。     

基于MapXtreme的WebGIS中间件的研究与应用

提出了在MapXtreme基础上进行WebGIS中间件开发的设计方法。WebGIS中间件屏蔽了底层操作系统的复杂性，使程序开发人员面对一个简单而统一的开发环境，减少程序设计的复杂性。将WebGIS中间件技术应用于油田地质图的动态生成、发布中，解决了油田分布式多数据源的访问、管理和地质图的动态生成、发布以及地质对象信息查询等问题。     

一种应用于通信环境下的服务配置器框架

静态链接和配置服务的软件开发技术严重增加了网络应用的开发和维护开销,利用ACE服务配置器框架可以帮助软件开发者简化对应用的部署、配置、重配置。介绍ACE服务配置器框架的核心设计与实现,揭示该框架的动态重配置机制,并分析基于该框架实现的短信服务配置器的关键技术。     

基于中间件的动态重配置容错对象管理框架

该文从容错QoS角度出发，为现有的基于中间件的容错对象管理框架增加自适应特性．首先把动态童配置定义成容错属性集（及其实现）、计算环境和资源变化描述、动态调整算法三者之间的互动关系，然后采用反射模型和发布／订阅模型建立了一个动态重配置管理框架，可以使系统在发现计算环境的变化、定制动态调整算法等多方面得到有力的支持，为系统有效实施动态重配置奠定了基础．     

面向普适计算的动态自适应中间件模型

为了提高普适计算系统的开发效率, 设计了一个基于OSGi框架的动态普适计算中间件模型. 该中间件模型以OSGi框架为基础, 建立移动管理器管理用户和服务的移动, 利用上下文管理器来管理上下文, 动态调整自己的行为, 支持上下文感知应用. 通过标准的接口实现各种异构普适设备间的互操作性. 实验结果表明该中间件能够满足通用普适计算环境的要求, 对于普适计算系统的开发具有一定的借鉴意义.     

一种普适计算环境下自适应中间件

普适计算环境固有的内在复杂性对当前的基础软件提出了新的挑战,迫切需要一种具有感知和自适应能力的中间件.提出了一个由接口、框架和情境元模型组成的自适应中间件,给出了在CAR构件平台上的设计与实现.为获取构件信息和对外提供服务,接口元模型支持同步和异步接口.情境元模型在构件对象内建模情境信息,计算实体间以基于异步事件通知方式交互.框架元模型分类和管理构件,随着运行时计算环境的变化动态改变中间件的结构和行为.软件实体感知环境的变化,实体间以松耦合的方式交互,动态改变自身的结构和行为,满足普适计算环境下的动态自适应需求.     

上海网格中间件中基于负载平衡的调度框架

在网格环境中，实现动态的负载平衡在服务调度中起到了非常关键的作用。然而，网格环境中的资源的动态性决定了它难以被监控，自治性又决定了它难以被集中管理。为在网格中间件中实现服务调度的负载平衡，提供了一些具有参考价值的解决方案。介绍设计和实现调度框架的动机以及需要解决的问题，并深入探讨在上海网格中间件中设计和实现调度框架的思路，以及达到动态负载平衡的具体方案。     

QoS需求驱动的服务配置框架

为支持服务质量敏感的基于组件的分布式应用的开发,中间件需要为组件提供并配置各种服务质量服务的非功能性属性.目前的组件架构提供的服务配置方式大多是静态的,且没有考虑不同客户的需求.在对EJB架构进行研究的基础上,提出一种服务质量需求驱动的服务配置框架.研究了根据客户的服务质量需求,在组件实例级别自动生成服务配置决策并实施,实现对不同客户服务差分处理.框架是一个基于服务配置的决策模型,通过多选择背包问题生成服务配置策略.最后通过一个应用实例对框架进行了验证.     

基于分层混合专家神经网络的Web服务失效检测机制

利用反射中间件来检测导致服务失效的各种状态和参数，从服务内部动态调整服务运行状态和配置，可以有效地避免服务失效．将分层混合专家神经网络（Hierarchical Mixtures of Expert neural network, HME）配置在反射中间件的元层中，用来检测这些服务的失效环境状态，并解决引起Web服务失效的状态．利用极大似然（Expectation Maximization, EM）的学习策略对分层混合专家网络进行训练．实验和数据分析表明，HME网络作为反射中间件检测技术可以高效地对服务失效进行检测和辨识．     

基于OSGi的RFID中间件安全框架

针对原有射频识别(RFID)中间件存在恶意跟踪、修改、假冒等安全问题,提出一种RFID中间件可重构安全框架。采用SOA与OSGi的插件架构降低各组件间的耦合性、增加部分组件的重用性、发现与绑定可获取的组件服务,通过生命周期管理对各模块进行安全状态监控,实现实时动态操作管理。测试结果表明,该框架具有可动态扩充、集中管理以及高度模块化的特点,可提高RFID的应用效率,加强其可靠性与安全性。     

Integrated Development of Context-Aware Applications in Smart Spaces

When designing context-aware applications for smart spaces, developers must provide interface specifications for perceptual components, which often come from multiple vendors. The authors outline a set of structuring principles that leverage such specifications. IBM has introduced two tools that facilitate the development of smart space applications. Chilix is a middleware library for bridging disaggregated systems, and SitCom is an integrated development environment enabling context modeling, and simulation and lifecycle management of perceptual components. Chilix provides an attractive lightweight alternative to legacy middleware for distributed computing. SitCom supports perceptual component developers, service developers and context-modeling experts across the development life cycle.     

Middleware for pervasive computing: A survey

The rapidly emerging area of pervasive computing faces many challenging research issues critical to application developers. Wide heterogeneity of hardware, software, and network resources pose veritable coordination problems and demand thorough knowledge of individual elements and technologies. In order to ease this problem and to aid application developers, different middleware platforms have been proposed by researchers. Though the existing middleware solutions are useful, they themselves have varied features and contribute partially, for context, data, or service management related application developments. There is no single middleware solution that can address a majority of pervasive computing application development issues, due to the diverse underlying challenges. In this survey paper, we identify different design dimensions of pervasive computing middleware and investigate their use in providing various system services. In-depth analysis of the system services have been carried out and middleware systems have been carefully studied. With a view to aid future middleware developers, we also identify some challenging open research issues that have received little or no attention in existing middleware solutions.     

Arcademis: a framework for object‐oriented communication middleware development

This paper presents Arcademis, a Java‐based framework for communication middleware development. Arcademis consists of a set of abstract classes, interfaces and concrete components that define the general architecture of middleware systems. Its main objective is to support the implementation of non‐monolithic and easily configurable middleware platforms. Arcademis can be used by middleware developers to deploy systems that meet the requirements of a particular network or technology. Instances of Arcademis can also be customized by distributed systems engineers to meet the requirements of a particular application. For example, new transport protocols, connection management policies, authentication algorithms or invocation semantics can be easily configured in middleware platforms derived from Arcademis. In order to illustrate the use of the framework, the paper describes the RME system, a middleware derived from Arcademis that adds a remote method invocation service to the CLDC configuration of Java 2 Micro Edition (J2ME). Copyright © 2006 John Wiley & Sons, Ltd.     

REST架构工作流中间件设计与实现

为解决异构应用间的流程化协作问题,比较了主流的面向服务架构实现方案,研究了一种REST架构工作流中间件.该中间件以工作流支撑服务的形式发布,为工作流应用系统提供统一的流程管理环境和任务流转能力.结合需求细化了工作流中间件外部访问接口,详细介绍了REST架构工作流中间件的资源发布方式,以及资源使用过程中工作流控制数据和工作流相关数据的序列化方式,并以实例验证了中间件的可用性.     

A pluggable middleware architecture for developing context-aware mobile applications

The proliferation of powerful smartphone devices provides a great opportunity for context-aware mobile applications becoming mainstream. However, we argue that conventional software development techniques suffer because of the added complexity required for collecting and managing context information. This paper presents a component-based middleware architecture which facilitates the development and deployment of context-aware applications via reusable components. The main contribution of this approach is the combination of a development methodology with the middleware architecture, which together bring significant value to developers of context-aware applications. Further contributions include the following: The methodology utilizes separation of concerns, thus decreasing the developmental cost and improving the productivity. The design and implementation of context-aware applications are also eased via the use of reusable components, called context plug-ins. Finally, the middleware architecture facilitates the deployment and management of the context plug-ins in a resource-aware manner. The proposed methodology and middleware architecture are evaluated both quantitatively and qualitatively.     

A Review of Approaches to Developing Service Management Systems

As service management systems are deployed in an open service market environment, the pressures on their developers to shorten development times and improve the flexibility of systems will increase. Component reuse may help in alleviating some of these pressures; however, while object-oriented reuse is used in the definition of interfaces for management systems, the systematic application of reuse to the systems' internal design is not well established. This paper examines some of the approaches applicable to service management system development from the Telecommunications, Distributed Systems, Internet and Software Engineering fields. Experience in applying some of these approaches is presented, and based on this, refined approaches to service management system development are discussed.     

面向银行的一种中间件的前后处理过程

银行风险数据处理中间件是一种主要采用数据集市技术来支持银行各种风险监管系统的高层应用中间件。本文首先探讨了提出银行风险数据处理中间件的客观原因和对其进行研究的意义,构建出了中间件系统的体系结构,详细描述了各主要功能模块,并着重设计了面向前端和后端的应用服务接口,最后给出了中间件系统的一个应用实例。中间件系统提炼和封装了共同的银行风险数据处理逻辑,为前端各种风险管理应用提供统一的服务接口和平台,大大缩小了银行风险管理系统的开发周期和开发成本。