中间件技术在移动增值领域的设计与实现

中间件是构件化软件的一种表现形式，中间件抽象了典型的应用模式。以一个移动增值平台为例，阐述构件化中间件系统的基本技术及在移动增值领域的应用。通过移动中间件在实际应用系统的具体设计与模块实现，设计一种基于数据库为中介的通用移动增值服务平台，并具体分析中问件满足快速开发和增强系统稳定性的优点，以及在增值领域开发还需要关注的问题。阐述了用移动中间件建立通用移动增值服务系统的必然性。     

基于上下文感知移动中间件的研究与设计

移动环境和设备的限制,给移动开发带来了挑战。移动中间件能够为移动应用开发提供了一个很好的基础平台。叙述了自适应机制在中间件层实现的必要性,分析了传统面向对象中间件应用在移动计算环境中的不足。根据移动应用的需求,提出了一个基于上下文感知的移动中间件体系结构。     

中间件技术研究

中间件技术屏蔽了底层分布式环境的复杂性和异构性,简化了分布式应用程序的开发,使分布式应用程序的健壮性、可扩展性、可用性更好。本文介绍了中间件的定义、分类、主流中间件技术平台,能够隐藏底层网络环境的复杂性,处理平台之间的异构性,是分布式计算和系统集成的关键组件。本文介绍了中间件的基本概念,阐述了一种基于系统层次的分类方法,并详细讨论了现存各类中间件技术的特点、相关标准及发展应用情况。     

中间件技术在移动增值领域的设计与实现

中间件是构件化软件的一种表现形式,中间件抽象了典型的应用模式.以一个移动增值平台为例,阐述构件化中间件系统的基本技术及在移动增值领域的应用.通过移动中间件在实际应用系统的具体设计与模块实现,设计一种基于数据库为中介的通用移动增值服务平台,并具体分析中间件满足快速开发和增强系统稳定性的优点,以及在增值领域开发还需要关注的问题.阐述了用移动中间件建立通用移动增值服务系统的必然性.     

移动中间件

1.引言随着社会信息化进程的加快和各种无线接入技术的迅速发展,移动计算机网络得到突飞猛进的发展。同时,利用移动计算机网络开展分布式处理正在萌芽,而这一业务的实施需要使用互操作技术,移动中间件正是在此背景下应运而生。本文首先分析移动计算机网络的特点、传统中间件技术在移动环境下所面临的挑战,引出移动中间件必具特征,常见协议,并给出硬移动中间件系统框架。然后从软移动方面阐述了移动中间件,并阐述了一种既有硬移动,又有软移动的总线结构移动CARBA,最后给出测试和总结。     

基于中间件的移动BOSS系统的设计与实现

自Client／server体系结构问世以来，中间件作为分布式网络上异构平台的互联桥梁应运而生，使用中间件进行大型应用系统的设计开发已经成为潮流。针对移动BOSS系统当前存在的一些问题，结合移动BOSS系统的结构和功能，设计并实现了基于中间件的4层体系结构的移动BOSS系统。系统增强了安全性、稳定性。     

拓扑自适应的移动自组网P2P中间件系统

P2P计算模型以其独特的分布式特性为移动自组网这种信息和控制高度分布的网络架构提供了理想的上层计算框架,这种计算二元性使我们很自然地将P2P计算平台与移动自组网结合起来。本文讨论几种常见的P2P拓扑结构在各种应用环境下的优缺点,提出一种能够运行在移动自组网和Internet上,具有P2P网络拓扑独立性和设备平台独立性、能够为上层P2P应用程序提供路由和信息服务的中间件系统模型TPMM,为P2P在移动自组网上的应用提供一个开放、稳定、高效和安全的支撑平台,并给出TPMM在J2ME平台上的参考实现。     

基于Tuxedo中间件的分布式业务系统的实现

近年来,如何将异构平台之上的应用集成起来成为一个非常现实、困难的问题。中间件使得这种实现成为可能,它屏蔽了异构的平台,使得应用的开发不必关心底层与异构平台相关的实现细节。本文说明了中间件的定义和分类,并介绍了一种在原有的业务系统上集成中间件的方法,集成之后的系统能够集中式也可以分布式运行。     

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.     

一种基于Agent的移动应用框架设计与应用研究

随着无线网络的发展和移动设备的日益普及，人们对这种移动计算模式的应用需求逐渐增多，然而目前无线网络和移动设备同传统的固定网络和计算设备相比有很多局限性，基于传统计算模式的软件系统结构无法直接在新型的移动计算环境下应用。本文分析了移动计算环境的特点以及移动应用系统的设计需求，并提出一种基于agent的移动应用框架的设计方案t在该框架中我们还引入了中间层结构并且设计了无线交互协议，从而可以更好地适应移动计算的环境，本文最后把该框架应用于一个面向移动用户的服务发现系统中，从而验证了该框架在移动系统环境中具有较高的适应性和良好的使用性。     

FollowMeLite：用于普适计算的轻量级中间件平台

普适计算的目标是让环境和计算资源紧密结合，以便更好地为人类服务。为达到这一目标，移动设备和嵌入式设备构成了环境中计算资源的重要组成部分。然而，由于移动设备和嵌入式设备的计算资源有限，网络连接的多样性和不稳定性以及软硬件的异构性，开发用于这些设备的上下文感知应用复杂并且费时，其根本原因是缺乏一个统一的平台支持。为解决这一问题，我们提出了一种用于普适计算的轻量级中间件平台，叫做FollowMeLite。FollowMeLite是整个FollowMe普适计算基础结构中的一部分。它构建在OSGi之上，集成了基于本体的上下文模型和基于工作流的应用模型以及用于适应多种网络连接的通讯服务。通过部署不同的组件模块，FollowMeLite可以方便的适用于多种应用环境。     

面向多终端适配的移动中间件的设计与实现

随着3G技术的应用和推广,手机游戏、动漫、音频、视频等应用成为手机增值业务的重要发展方向.而现有的手机应用普遍存在两方面的问题:一是应用的开发比较复杂,需要面对不同的应用逻辑;二是手机应用需要支持各种不同的手机终端,适配工作量巨大.因此,本文在传统中间件、移动中间件思想的基础上,提出一种面向多终端适配的移动中间件的架构...     

一种数据仓库互操作框架的设计

为了节省网络带宽,加快各数据仓库之间互相访问速度,在Web服务器基础上构造了一个支持和应用移动Agent的数据仓库互操作框架.该框架采用中间件技术,能够在有限的网络资源下,避免大量数据的网络传输,提高查询效率,提高在网络连接断续和不稳定情况下互操作的可靠性,便于升级和维护,具有良好的伸缩性和适应性.     

Middleware services for P2P computing in wireless grid networks

Advances in network architecture are changing application and service delivery. The wireless industry, for example, now talks of service grids - collections of separate wireless services collated from across the network. However, with current limitations in mobile device capabilities, a scalable and efficient middleware platform is essential. The authors' new middleware architecture, called scalable inter-grid network adaptation layers (signal), integrates mobile devices with existing grid platforms to conduct peer-to-peer operations through proxy-based systems. Combining mobile P2P applications with grid technologies could ultimately give mobile devices the power of supercomputers.     

An antibody network inspired evolutionary framework for distributed object computing

In order to meet the increasing scale and users requirements for the distributed object computing (DOC) systems, their infrastructures are highly desirable to be redesigned. Based on the principles of immune system and the evolution mechanisms learned from an antibody network model, a novel evolutionary framework for DOC (E-DOC) is proposed. The antibody network model as well as the evolution process including clonal proliferation, immune elimination, and immune memory is studied. Then, E-DOC framework based on the antibody network is proposed, whose simulation platform is designed and implemented. On the platform, the evolutionary features are studied by: (1) diversity and stability of antibodies and genotypes, (2) detection and elimination of antigens, (3) effect of immune memory, and (4) tendency of eliminated and stimulated antigens. The experiment results show that the proposed framework can achieve the evolution ability and the promising performance, which are critical to DOC systems. E-DOC is extendable for the future design of distributed object middleware, such as WebSphere Application Server and BEA WebLogic Application Server.     

采用中间件在MIDP移动设备上实现非HTTP协议

CLDC/MIDP的移动设备都支持HTTP协议，对于HTTP之外的协议是否支持要视具体平台而定，这使得基于非HTTP协议的应用无法在所有移动设备上通用。通过在WEB服务器端部署中间件，将移动设备的网络功能后移到服务器端，从而使得针对其他协议的应用通过HTTP协议间接实现，达到一次编写多次使用的目的，而且，将MIDLET的大部分处理交由中间件处理可以提高系统效率，增强网络安全。     

Normalizing abstractions of heterogeneous robotic systems by using Roles: usability study in the administration of software and development tools

The modern approach for developing software in service robotics is through the use of robotics middleware platforms. Although the main concept is similar across platforms, their discrepancy among abstractions hinders the composition and administration of highly integrated systems, resulting in usability issues for the developers. We identify that this can be improved by normalizing the abstractions of the heterogeneous systems at runtime. We propose a framework that sets the concept of ‘Roles’ to define a novel method of creating and reasoning system models by normalizing abstractions to produce practical platform-agnostic representations of systems, which is implemented in a cross-platform infrastructure and a GUI. This paper verifies and validates the functionality and usability (by benchmarking) of the proposed framework through a case study using a real and a simulated mobile robot. The results from usage trials with test subjects showed improved usability, and demonstrated the overall advantage of using the proposed approach.     

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.     

An Adaptive Middleware for Context-Sensitive Communications for Real-Time Applications in Ubiquitous Computing Environments

Context-sensitivity is an important expected capability in applications in ubiquitous computing (ubicomp) environments. These applications need to use different contextual information from the user, host device, on board sensors, network, and the ambient environments to systematically adapt their actions. In addition, some context-sensitive applications may use specific contextual conditions to trigger impromptu and possibly short-lived interactions with applications in other devices. This property, referred to as context-sensitive or context-aware communications, allows applications to form short-range mobile ad hoc networks consisting of mobile and stationary devices, sensors, and other computing resources. Real-time applications, especially those having reactive behavior, running on embedded devices and requiring context-sensitive communications support, pose new challenges related to systematic representation of specific contexts, associations of contexts with real-time actions, timely context data collection and propagation, and transparent context-sensitive connection establishment. An object-based middleware can be effective to meet these challenges if such a middleware can provide a well-defined development framework as well as lightweight runtime services. In this paper, an adaptive and object-based middleware, called reconfigurable context-sensitive middleware (RCSM) is presented to facilitate context-sensitive communications in ubicomp environments. To facilitates context-sensitive communications, RCSM provides a context-aware interface definition language for specifying context-sensitive interfaces of real-time objects, an object container framework for generating interfaces-specific context-analyzers, and a context-sensitive object request broker for context-sensitive object discovery and impromptu connection management. RCSM is adaptive in the sense that depending on the context-sensitive behavior of the applications, it adapts its object discovery and connection management mechanisms.     

Mobile Agent在网络管理中应用

探讨了传统的基于SNMP协议的网络管理系统的不足，分析了集中式网络管理方法的局限性和比较了各种分布式网络管理技术优缺点后，提出了采用移动代理技术(Mobile Agent)来实现网络管理并描述了一种用于设计和开发网络管理系统的移动代理技术的概要性实现框架。文章表明在网络管理中采用移动代理技术可以很好地解决目前集中式网络管理中遇到的相关问题，能有效提高网络管理的可靠性和效率。