Implement a replicated tuple space using the algorithm of Xu and Liskov [1989]. Explain how this algorithm uses the semantics of tuple space operations to optimize the replication strategy.
What will be an ideal response?
This is a programming exercise left to the reader with further details of the algorithm found in the Xu and Liskov paper.
In terms of optimization, this algorithm is based around a deep understanding of the semantics of tuples spaces and the associated operations, recognizing that tuples are immutable, that reads do not interfere with the tuple space and it is only necessary to find one tuple (which may be local or may be found nearby), that take operations only need to lock tuples spaces until the appropriate tuple is selected for deletion with this supplemented by the additional rules, again extracted from the required semantics associated with the concurrent execution of different operations.
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The variable that accumulates a total of the numbers in a running total is called a(n) ____________.
a. counter b. sentinel c. entity d. accumulator
What is the output of the following program?
``` public class Test { public static void main(String[] args) { int[][] values = {{3, 4, 5, 1}, {33, 6, 1, 2}}; int v = values[0][0]; for (int[] list : values) for (int element : list) if (v > element) v = element; System.out.print(v); } } ``` a. 1 b. 3 c. 5 d. 6 e. 33