Alex D Herbert created RNG-115:
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Summary: JDKRandom to allow restore state when saved from a
different instance
Key: RNG-115
URL: https://issues.apache.org/jira/browse/RNG-115
Project: Commons RNG
Issue Type: Bug
Components: core
Affects Versions: 1.2
Reporter: Alex D Herbert
Assignee: Alex D Herbert
Currently the size of the serialized state of the java.util.Random used by
JDKRandom is saved to the instance when the state is saved. Thus the state
cannot be used to restore a different instance of the same class. This breaks
the contract of the RestorableUniformRandomProvider as the state should be
applicable to a different instance of the same class.
Fix this test to work:
{code:java}
@Test
public void testRestoreToNewInstance() {
final long seed = 8796746234L;
final JDKRandom rng1 = new JDKRandom(seed);
final JDKRandom rng2 = new JDKRandom(seed + 1);
final RandomProviderState state = rng1.saveState();
rng2.restoreState(state);
final int numRepeats = 1000;
for (int r = 0; r < numRepeats; r++) {
Assert.assertEquals(r + " nextInt", rng1.nextInt(), rng2.nextInt());
}
}
{code}
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