By Danny Lange, Mitsuru Oshima
ISBN-10: 0201325829
ISBN-13: 9780201325829
The definitive consultant on find out how to application cellular web brokers in Java utilizing the Aglet API. This e-book covers the cellular agent paradigm and the way it's carried out within the Java platform. It additionally presents info at the complete API and covers complicated issues reminiscent of Agent layout styles and safety.
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Extra resources for Programming and Deploying Java(TM) Mobile Agents with Aglets(TM)
Example text
Unfortunately, there is no inherent synchronisation in this mechanism and it is easy for one process to write a value to memory for storage, and have another process overwrite it with a new value, or even erroneous data. To combat this problem, new techniques for synchronisation between processes were developed such as semaphores [Dijkstra68b], monitors [Hoare74] and sequences [Reed79]. A further communication mechanism developed was known as a Message queue. Message queues allow any process to write to a named queue and for any process to read from the queue.
In examining today’s distribution mechanisms we show that the fundamental abstraction in these systems is one of location transparency. Further, we demonstrate that the emergence of location transparency is a result of the layers of abstraction found beneath it. We argue that by using this approach we are attempting to impose an unsuitable abstraction onto the underlying hardware substrate. 2 The Advent of Distribution Before the invention of computers, processing information was both slow and tedious [Rose90].
To combat this problem, new techniques for synchronisation between processes were developed such as semaphores [Dijkstra68b], monitors [Hoare74] and sequences [Reed79]. A further communication mechanism developed was known as a Message queue. Message queues allow any process to write to a named queue and for any process to read from the queue. Synchronisation is inherent in the read/write operations and the message queue, which between them can support asynchronous communication between many different processes [Simon96].
Programming and Deploying Java(TM) Mobile Agents with Aglets(TM) by Danny Lange, Mitsuru Oshima
by Kevin
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