This new edition provides a comprehensive overview of emerging distributed-systems technologies and includes many state-of-the-art infrastructures and technologies. It also offers exercises and historical contexts for each of the technologies.

Peers In A Client Server World provides a comprehensive overview of emerging peer-to-peer (P2P) technologies that have revolutionized the way we think about distributed computing and the internet. These technologies are compared to alternative solutions, most notably web services and Grid computing but also other technologies, such as client/server based systems and agent technologies. A wide range of diverse middleware and application-based technologies are covered, such as JXTA, Jini, Globus, Web services, OGSA, J2EE, Napster and Gnutella, with an emphasis given on the architecture employed and security model chosen. Each technology and its capabilities are analyzed in the context of the degree of centralization or decentralization they employ. A resulting taxonomy is created that gives the reader a context in which to consider the most advanced and broad ranging distributed systems available today, and provides them with an essential reference text for designing new distributed systems.

Common Themes.- Discovery Protocols.- Structured Document Types.- Distributed Security Techniques.- Distributed Environments.- The Web.- Peer-2-Peer Environments.- Web Services.- Distributed Objects and Agent Technologies.- Grid Computing.- Protocols and Architectures I - P2P Applications.- Gnutella.- Scalability.- Freenet.- BitTorrent.- Protocols and Architectures II - Middleware.- Jini.- Jxta.- Web Services Protocols.- OGSA.- Web 2.0.- On the Horizon.- Deployment.- Distributed Object Deployment Using Jini.- P2P Deployment Using Jxta.- Web Services Deployment.- Web Deployment Using Atom.- ERRATA.

Over the past several years, Internet users have changed in their usage p- terns from predominately client/server-based Web server interactions to also involving the use of more decentralized applications, where they contribute more equally in the role of the application as a whole, and further to d- tributed communities based around the Web. Distributed systems take many forms, appear in many areas and range from truly decentralized systems, like Gnutella, Skype and Jxta, centrally indexed brokered systems like Web s- vices and Jini and centrally coordinated systems like SETI@home. From P2P and Grids and Services on the Web Evolving Distributed Communities provides a comprehensive overview of the emerging trends in peer-to-peer (P2P), distributed objects, Web Services, the Web, and Grid computing technologies, which have rede ned the way we think about d- tributed computing and the Internet. The book has four main themes: d- tributed environments, protocols and architectures for applications, protocols and architectures focusing on middleware and nally deployment of these middleware systems, providing real-world examples of their usage.