JAVASPACES PRINCIPLES PATTERNS AND PRACTICE PDF

This important book and its many examples will help you learn about distributed and parallel programming. I highly recommend it to students, programmers, and the technically curious. JavaSpaces technology, a powerful Jini service from Sun Microsystems, facilitates building distributed applications for the Internet and Intranets. The JavaSpaces model involves persistent object exchange "areas" in which remote processes can coordinate their actions and exchange data. It provides a necessary ubiquitous, cross-platform framework for distributed computing, emerging as a key technology in this expanding field. This book introduces the JavaSpaces architecture, provides a definitive and comprehensive description of the model, and demonstrates how to use it to develop distributed computing applications.

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Object Spaces[ edit ] Object Spaces is a paradigm for development of distributed computing applications. It is characterized by the existence of logical entities, called Object Spaces. All the participants of the distributed application share an Object Space.

A provider of a service encapsulates the service as an Object , and puts it in the Object Space. Clients of a service then access the Object Space, find out which object provides the needed service, and have the request serviced by the object.

Object Spaces, as a computing paradigm, was put forward in the s by David Gelernter at Yale University. Gelernter developed a language called Linda to support the concept of global object coordination. Object Space can be thought of as a virtual repository, shared amongst providers and accessors of network services, which are themselves abstracted as objects. Processes communicate among each other using these shared objects — by updating the state of the objects as and when needed.

An object, when deposited into a space, needs to be registered with an Object Directory in the Object Space. Any processes can then identify the object from the Object Directory, using properties lookup, where the property specifying the criteria for the lookup of the object is its name or some other property which uniquely identifies it. A process may choose to wait for an object to be placed in the Object Space, if the needed object is not already present.

Objects, when deposited in an Object Space are passive, i. Instead, the accessing process must retrieve it from the Object Space into its local memory, use the service provided by the object, update the state of the object and place it back into the Object Space.

This paradigm inherently provides mutual exclusion. Because once an object is accessed, it has to be removed from the Object Space, and is placed back only after it has been released. This means that no other process can access an object while it is being used by one process, thereby ensuring mutual exclusion. JavaSpaces[ edit ] JavaSpaces is a service specification providing a distributed object exchange and coordination mechanism which may or may not be persistent for Java objects.

It is used to store the distributed system state and implement distributed algorithms. In a JavaSpace, all communication partners peers communicate and coordinate by sharing state. Distribution can also be to remote locations; however, this is rare as JavaSpaces are usually used for low-latency , high-performance applications rather than reliable object caching.

The most common software pattern used in JavaSpaces is the Master-Worker pattern. The Master hands out units of work to the "space", and these are read, processed and written back to the space by the workers. In a typical environment there are several "spaces", several masters and many workers; the workers are usually designed to be generic, i.

JavaSpaces is part of the Java Jini technology, which on its own has not been a commercial success. JavaSpaces remains a niche technology mostly used in the financial services and telco industries where it continues to maintain a faithful following. First, an object to be shared in the Object Space is made. Such an object is called an Entry in JavaSpace terminology. Here, the Entry is used to encapsulate a service which returns a Hello World!

The server which provides this service will create an Object Space, or JavaSpace. The Entry is then written into the JavaSpace. The client reads the entry from the JavaSpace and invokes its method to access the service, updating its usage count by doing so. The updated Entry is written back to the JavaSpace.

Addison-Wesley Professional, 1. Addison Wesley, ,.

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JavaSpaces principles, patterns, and practice

This important book and its many examples will help you learn about distributed and parallel programming. I highly recommend it to students, programmers, and the technically curious. JavaSpaces technology, a powerful Jini service from Sun Microsystems, facilitates building distributed applications for the Internet and Intranets. The JavaSpaces model involves persistent object exchange "areas" in which remote processes can coordinate their actions and exchange data. It provides a necessary ubiquitous, cross-platform framework for distributed computing, emerging as a key technology in this expanding field. This book introduces the JavaSpaces architecture, provides a definitive and comprehensive description of the model, and demonstrates how to use it to develop distributed computing applications.

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