TAILIEUCHUNG - MIDDLEWARE NETWORKS- P6

MIDDLEWARE NETWORKS- P6: The material in this book is presented in three major parts: IP Technology Fundamentals, IP Service Platform Fundamentals, and Building the IP Platform. Part I of IP Technology Fundamentals presents key technologies and issues that lay the foundation for building IP service platforms. | 226 Middleware Networks Concept Design and Deployment two kinds of systems is highly instructive in regards to the specific middleware designs. IP networks are a prime example of distributed information. Rather than depend on global shared state or the correctness of every routing entry IP utilizes multiple distributed information bases located at the routers switches and end points. AS-needed computation shares information with the local neighborhood. These distributed properties facilitate large networks and global scale However these systems cannot easily locate specific information or control fine-grained resource allocations. such networks require substantial extensions - such as networking middleware - to support services-specific routing or bandwidth allocations. An important challenge is support of such state-dependent services - or an approximation of them - without compromising the stateless nature of IP. Conventional operating systems on the other hand retain localized and detailed information. Low-level data structures organize the information and facilitates the management of system resources including the virtual machine concept. Higher-level descriptions allow exercise of very precise control over system behavior for example by reference to a specific user s privileges. However as the number ofprocesses users and other resources increases the maintenance of this information becomes increasingly costly. systems therefore migrated towards distributed architectures that localize information for related tasks. Micro-kernel operating systems for example exploit this principle. In a similar manner the networking middleware combines multiple systems. This views the networking middleware as a large and distributed micro-kernel operating system. Linux is well-known for a similar approach. The power of Linux is the mechanisms to easily reconfigure the kernel while retaining Posix compliance. Linux s popularity is not due to its stability nor to serving as an .

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