Distributed Coordination-Based Systems - Maarten van Steen

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Coordination-Based Systems 13.2 Architectures Example: Jini/Javaspaces Coordination model Temporal and referential uncoupling by means of JavaSpaces, a tuple-based storage system. A tuple is a typed set of references to objects Tuples are stored in serialized, that is, marshaled form into a JavaSpace To read a tuple, construct a template, with some fields left open Match a template against a tuple through a field-by-field comparison 6 / 14
7 / 14 Coordination-Based Systems Example: Jini/Javaspaces 13.2 Architectures A Write A B Write B T Read T C Insert a copy of A Insert a copy of B Look for tuple that matches T Tuple instance A B B B A C Return C (and optionally remove it) A JavaSpace Write: A copy of a tuple (tuple instance) is stored in a JavaSpace Read: A template is compared to tuple instances; the first match returns a tuple instance Take: A template is compared to tuple instances; the first match returns a tuple instance and removes the matching instance from the JavaSpace
Page 1 and 2: Distributed Systems Principles and
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