public void PropagatesExceptions()
{
AFnImpl fn = new AFnImpl();
fn._fn0 = () => { throw new Exception("future exception"); };
Future f = new Future(fn);
try
{
f.deref();
Assert.Fail("expected future exception");
}
catch (Exception ex)
{
Expect(ex.Message, EqualTo("Future has an error"));
Expect(ex.InnerException, Is.Not.Null);
Expect(ex.InnerException.Message, EqualTo("future exception"));
}
// Same result for subsequent derefs.
try
{
f.deref();
Assert.Fail("expected future exception");
}
catch (Exception ex)
{
Expect(ex.Message, EqualTo("Future has an error"));
Expect(ex.InnerException, Is.Not.Null);
Expect(ex.InnerException.Message, EqualTo("future exception"));
}
}
public static IFn CreateForReduce()
{
AFnImpl fn = new AFnImpl();
fn._fn2 = (object x, object y) => { return(Numbers.addP(x, y)); };
return(fn);
}
public static IFn CreateForReduce()
{
AFnImpl fn = new AFnImpl();
fn._fn2 = (object x, object y) => { return(((int)x) + ((int)y)); };
return(fn);
}
internal static IFn CreateForMetaAlter(IPersistentMap meta)
{
AFnImpl fn = new AFnImpl();
fn._fn0 = () => { return(meta); };
fn._fn1 = (object x) => { return(meta); };
return(fn);
}
public void SecondCancelReturnsFalse()
{
AFnImpl fn = new AFnImpl();
fn._fn0 = () => { while (true); };
Future f = new Future(fn);
Expect(f.cancel(true)).To.Equal(true));
Expect(f.cancel(true)).To.Equal(false));
}
public void DerefThrowsAfterCancellation()
{
AFnImpl fn = new AFnImpl();
fn._fn0 = () => { while (true); };
Future f = new Future(fn);
f.cancel(true);
f.deref();
}
public void CancelAbortsTheTask()
{
AFnImpl fn = new AFnImpl();
fn._fn0 = () => { while (true); };
Future f = new Future(fn);
Expect(f.isCancelled()).To.Equal(false));
Expect(f.cancel(true)).To.Equal(true));
Expect(f.isCancelled()).To.Equal(true));
}
public void CancelFailsAfterSuccessfulCompletion()
{
AFnImpl fn = new AFnImpl();
fn._fn0 = () => { return 42; };
Future f = new Future(fn);
Expect(f.deref()).To.Equal(42);
Expect(f.cancel(true)).To.Equal(false);
Expect(f.isCancelled()).To.Equal(false);
}
public void CachesResultForSubsequentCalls()
{
int i = 0;
AFnImpl fn = new AFnImpl();
fn._fn0 = () => Interlocked.Increment(ref i);
Future f = new Future(fn);
Expect(f.deref()).To.Equal(1);
Expect(f.deref()).To.Equal(1);
Expect(i).To.Equal(1);
}
public void ComputesTheValueOnAnotherThread()
{
int workerID = Thread.CurrentThread.ManagedThreadId;
AFnImpl fn = new AFnImpl();
fn._fn0 = () =>
{
workerID = Thread.CurrentThread.ManagedThreadId;
return 42;
};
Future f = new Future(fn);
Expect(f.deref()).To.Equal(42);
Expect(workerID).To.Not.Equal(Thread.CurrentThread.ManagedThreadId);
}