By Tanenbaum
As allotted desktops develop into extra pervasive, there's a want for a publication that explains how their working platforms are designed and carried out. This publication, that is a revised and accelerated half II of the simplest promoting sleek working structures, fulfills that desire. KEY themes: It covers the fabric from the unique e-book, together with conversation, synchronization, strategies and dossier structures, and provides new fabric on allotted shared reminiscence. It additionally comprises four exact case reports, Amoeba, Mach, refrain, and OSF/DCE. Tanenbaum's trademark writing sort presents the reader with a radical but concise therapy of dispensed platforms.
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Extra resources for Distributed Operating Systems
Example text
When you look at any large enterprise in particular, you often notice a number of disparate systems built and bought over periods of time. Often these systems are incompatible with one another. The ability to link the systems becomes a crucial need for a large number of organizations. In addition, newly developed applications need to interoperate with the existing platforms, and the business needs to support applications written in different programming languages with different technologies. Also, companies need seamless interoperability across the organization between “purchased” software from different software vendors.
Hence, they do not need to be called web services. The protocol stack plays a major role in understanding SOA functionality. Therefore, we’ll discuss these protocols one by one. We will start with SOAP. CHAPTER 1 ■ INTRODUCING SERVICE-ORIENTED ARCHITECTURE ■Note Web services use metadata to describe what other endpoints need to know to interact with them. This includes WS-Policy (which describes the capabilities, requirements, and general characteristics), WSDL, and XML Schema. To bootstrap communication with web services and retrieve these and other types of |metadata, you use MEX, which is a specification that defines messages to retrieve metadata and policies associated with an endpoint.
Messages are the “cornerstones” of SOA. Messages enable you to create loosely coupled systems that can span multiple operating systems. SOA relies on messages not only to facilitate the business need but also to provide the “context” around the message (that is, the security context, the routing information of the message, whether you need to guarantee the delivery of the message, and so on). Now you’ll dive into more SOA details. Understanding Service-Oriented Architecture SOA and web services are the buzzwords that promise to solve all integration issues in the enterprise space.