@Test
public void shouldWireUpAtExitHook() {
factory.registerExitHook();
try {
Runtime.getRuntime().addShutdownHook(factory.exitHook());
} catch (Exception e) {
assertThat(e.getMessage(), is("Hook previously registered"));
}
}
/**
* Parallelism available to a Scheduler.
*
* <p>This defaults to {@code Runtime.getRuntime().availableProcessors()} but can be overridden
* for use cases such as scheduling work on a computer cluster.
*
* @return the scheduler's available degree of parallelism.
*/
public int degreeOfParallelism() {
return Runtime.getRuntime().availableProcessors();
}