January 1998
Intermediate to advanced
384 pages
10h 45m
English
Content preview from Java Distributed Computing
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Overview of JavaSpaces
The distributed application paradigm supported by JavaSpaces is one in which remote agents interact with each other indirectly through shared data object spaces. Objects are stored in a JavaSpace in the form of entries. Clients write entries into the space, read entries from the space, or take entries from the space, as shown in Figure 3.1.
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Figure C-1. JavaSpaces general architecture
Access to the entries in JavaSpaces is through a small set of basic operations:
- read
Read an entry from the space that matches a template.
- write
Add an entry to the space.
- take
Read and remove an entry from the space.
- notify
Send a notification through a given event handler if entries that match a template are added to the space. A notification request has a time-out period associated with it: if a matching entry isn’t added within the time-out period, the notify request fails and is dropped from the JavaSpace.
Multiple basic operations can be assembled into transactions that group basic operations into a single, atomic aggregate operation.
There can be many clients and many JavaSpaces in a given distributed application. One client, and even one transaction from one client, can access multiple JavaSpaces. So instead of one agent sending a message to another, or invoking a remote method directly on another object within an agent, agents interact by writing and reading objects in JavaSpaces. ...
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