Lease write(Entry entry, Transaction txn, long lease) throws TransactionException, RemoteException; long NO_WAIT = 0;. JavaSpaces Example by Example. 4. This interface is implemented by servers that export a * JavaSpaces technology service. The operations in this interface * are the public methods that all such. JavaSpaces is a powerful Jini service that provides a high-level tool for creating . For example, a distribute algorithm might require processes to work in lock.
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The intended audience is for intermediate to advanced programmers wanting to learn about JavaSpaces. Halter Published Nov 9, by Prentice Hall.
Using Leases with JavaSpaces. Next, he introduces the fundamental concepts of development, including entries, leasing, events, transactions, and persistence. That does not mean, however, that your application can have no security itself. Chapter 8, “Parallel Computing,” looks into some of the areas where you can get into performance trouble and also some of the ways in which JavaSpaces can be an aid to performance. Halter provides in-depth coverage of scalability and availability, concluding with detailed guidance on using security features based on Java 2 exammple to protect distributed JavaSpaces applications.
This chapter is intended to javaspacez familiarity and building blocks for these topics.
It covers a simple method of locating a single JavaSpace. Preface Preface Writing distributed programs is hard. Again, each of the topics is covered in a simple example examlle. Starting with the GUI. Doing this the first time can be a challenging experience.
Core Technologies, 2nd Edition. The Music Store Example. Piecing Together the Results. Register your product to gain access to bonus material or receive a coupon.
The hands-on, example-rich guide to JavaSpaces technology Building robust, scalable, high-performance distributed applications Up-to-the-minute coverage based on Jini 1. JavaSpaces exammple these capabilities with a very simple interface. The application presents a small ordering processing system. Chapter 7, “Sharing Fairly,” presents a more complex application example that makes use of and ties together many of the topics covered in earlier chapters.
Preface Writing distributed programs is hard. In a distributed application, JavaSpaces provides a shared virtual space that providers and requesters of objects can use to communicate easily.
A working knowledge of Java is needed, and an acquaintance with Jini concepts is very useful, but not required. Other Technologies of Examplle.
Each concept is presented in the context of simple examples at this point. This chapter shows you how some of the security features of Java can be currently used with JavaSpaces. In this book, I have tried to give complete examples for each of the concepts that are being discussed.
In Chapter 1, “About JavaSpaces” you explore what JavaSpaces are, how this book deals with them, and why anyone would want to use them. JavaSpaces is a Jini technology service. Effectively making use of the simple interface, however, requires a number of tools, both conceptual and practical. Chapter 10, “Wrapping It up” ties up any loose ends. Some common techniques for doing this, such as how to decide what computations could benefit from being distributed and how to distribute data, are discussed in this chapter.
To compile the classes for the synchronization example in Windows, use the following. Although an experienced Jini developer may skip this chapter, for beginners, this should be extremely valuable.
Obtaining and Installing JavaSpaces. This will be used exmple illustrate the concepts of sharing data in a fair and reliable manner. Starting the Supporting Services. In particular, some of the common problems, such as authorization configuration problems and improper codebase settings, are covered. This allows for the simple exchange of tasks, requests, and information in the form of Java objects.
You then look at what an Entry is and how it can be used. This chapter takes you through the process of installing Jini and JavaSpaces and running a simple application. Unlimited one-month access with your purchase. Book Sorry, this book is no longer in print. This should not be a surprising statement to anyone who has had to deal with a distributed programming environment in the past.
In particular, it uses the concept of a linked list to explore some of the differences between distributed and nondistributed data structures. You’ll learn powerful distributed programming techniques, including the effective use of data structures and collections; and better ways to improve performance, prevent deadlock, and take full advantage of parallelism.
A Prime Number Counter Application. Table of Contents Preface. Examples include using JavaSpaces as a mechanism for decoupled communication, application structuring, and parallel computing. Description Copyright Dimensions: This chapter covers locking and sharing issues and presents mechanisms, such as semaphores, for dealing with resource synchronization. Useful Places for Information.
This chapter covers some of the concepts involved with programming in a distributed environment. About This Book The intended audience is for intermediate to advanced programmers wanting to learn about JavaSpaces. Chapter 6, “Preventing Deadlock,” discusses mechanisms for allowing processes to avoid deadlock.
There are a number of ways to improve or degrade the performance of a distributed application.
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