SOA --ThoughtWorks Architect

本文探讨了服务导向架构(SOA)在大型复杂系统开发中的应用。SOA通过创建模块化且灵活的服务来简化系统复杂度,保持业务的灵活性与扩展性。ThoughtWorks分享了其在SOA领域的经验,强调了良好设计对于成功实现SOA的重要性。

http://www.thoughtworks.com/what-we-do /service-oriented-architecture.html

 

Large-scale applications are complex to develop and to live with. The key to simplifying them and living with them is to create modular, flexible systems. However this isn't easy. ThoughtWorks has extensive, proven experience of developing large-scale systems that live and evolve with the businesses that host them.

Service Oriented Architectures (SOA) are widely recognized as a pattern for modular, flexible and scalable solutions. (SOA被广泛认为是解决模块化、灵活性和规模化的范式或说某种价值体系。)Unfortunately they are also widely hyped as silver bullets, and as reasons to buy expensive middleware to support them.

SOA systems are difficult to do well, and the technologies surrounding them do not deliver any silver bullets, though they do make some new techniques available to the experienced development team. The principal issue for developers of SOA systems is, as always, the creation of effective interfaces between services that keep them loosely-coupled, thereby maintaining flexibility in use.

ThoughtWorks' approach to SOA is to align services within a SOA on business boundaries and to model the interactions between services on business interactions. We design interfaces between services in the context of specific real interactions from the perspective of clients of the service. Together these techniques result in interfaces between services that are designed to fulfil specific tasks, but because they are designed from the perspective of the client, hide the detail of how the service achieves its task.

From our perspective, good design, rather than technology choice, is the determinant of successful SOA.

SOA is an approach that is common to many of our projects, whether they are specifically "SOA" projects or not. These projects range in complexity from the implementation of a single service to the creation of SOA systems that provide the information infrastructure for entire businesses.

ThoughtWorks delivers world-class solutions using the relevant techniques and technologies on a daily basis.

基于51单片机,实现对直流电机的调速、测速以及正反转控制。项目包含完整的仿真文件、源程序、原理图和PCB设计文件,适合学习和实践51单片机在电机控制方面的应用。 功能特点 调速控制:通过按键调整PWM占空比,实现电机的速度调节。 测速功能:采用霍尔传感器非接触式测速,实时显示电机转速。 正反转控制:通过按键切换电机的正转和反转状态。 LCD显示:使用LCD1602液晶显示屏,显示当前的转速和PWM占空比。 硬件组成 主控制器:STC89C51/52单片机(与AT89S51/52、AT89C51/52通用)。 测速传感器:霍尔传感器,用于非接触式测速。 显示模块:LCD1602液晶显示屏,显示转速和占空比。 电机驱动:采用双H桥电路,控制电机的正反转和调速。 软件设计 编程语言:C语言。 开发环境:Keil uVision。 仿真工具:Proteus。 使用说明 液晶屏显示: 第一行显示电机转速(单位:转/分)。 第二行显示PWM占空比(0~100%)。 按键功能: 1键:加速键,短按占空比加1,长按连续加。 2键:减速键,短按占空比减1,长按连续减。 3键:反转切换键,按下后电机反转。 4键:正转切换键,按下后电机正转。 5键:开始暂停键,按一下开始,再按一下暂停。 注意事项 磁铁和霍尔元件的距离应保持在2mm左右,过近可能会在电机转动时碰到霍尔元件,过远则可能导致霍尔元件无法检测到磁铁。 资源文件 仿真文件:Proteus仿真文件,用于模拟电机控制系统的运行。 源程序:Keil uVision项目文件,包含完整的C语言源代码。 原理图:电路设计原理图,详细展示了各模块的连接方式。 PCB设计:PCB布局文件,可用于实际电路板的制作。
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