public void ModeExecutionAndPublication()
{
int invoke = 0;
bool fail = true;
LazyExpiry <int> lz = new LazyExpiry <int>(() => { ++invoke; if (fail)
{
throw new TestException();
}
else
{
return(Tuple.Create(99, future));
} }, LazyThreadSafetyMode.ExecutionAndPublication);
try
{
int x = lz.Value;
throw new FailException("#1");
}
catch (TestException) { }
Assert.True(1 == invoke, "#2");
try
{
int x = lz.Value;
throw new FailException("#3");
}
catch (TestException) { }
Assert.True(2 == invoke, "#4");
fail = false;
{ int x = lz.Value; }
Assert.True(3 == invoke, "#6"); // since two initializations failed, we get the value once it has not
}
public void ModeNone()
{
int x;
bool fail = true;
LazyExpiry <int> lz = new LazyExpiry <int>(() => { if (fail)
{
throw new TestException();
}
else
{
return(Tuple.Create(99, future));
} }, LazyThreadSafetyMode.None);
try
{
x = lz.Value;
throw new FailException("#1");
}
catch (TestException) { }
try
{
x = lz.Value;
throw new FailException("#2");
}
catch (TestException) { }
fail = false;
x = lz.Value;
// since lazy now can get a value, it should not fail
}
public void Expired_lazy()
{
counter = 42;
var x = new LazyExpiry <int>(() => Tuple.Create(counter++, DateTime.Now.AddDays(-1)));
Assert.True(42 == x.Value, "#1");
Assert.True(43 == x.Value, "#2");
Assert.True(44 == x.Value, "#3");
}
public void EnsureSingleThreadSafeExecution()
{
counter = 42;
bool started = false;
var l = new LazyExpiry <int>(delegate() { return(Tuple.Create(counter++, future)); });
bool failed = false;
object monitor = new object();
var threads = new Thread[4];
for (int i = 0; i < threads.Length; ++i)
{
threads[i] = new Thread(delegate()
{
lock (monitor)
{
if (!started)
{
if (!Monitor.Wait(monitor, 2000))
{
failed = true;
}
}
}
int val = l.Value;
});
}
for (int i = 0; i < threads.Length; ++i)
{
threads[i].Start();
}
lock (monitor)
{
started = true;
Monitor.PulseAll(monitor);
}
for (int i = 0; i < threads.Length; ++i)
{
threads[i].Join();
}
Assert.False(failed);
Assert.Equal(42, l.Value);
}
public void ModePublicationOnly()
{
bool fail = true;
int invoke = 0;
LazyExpiry <int> lz = new LazyExpiry <int>(() => { ++invoke; if (fail)
{
throw new TestException();
}
else
{
return(Tuple.Create(99, future));
} }, LazyThreadSafetyMode.PublicationOnly);
try
{
int x = lz.Value;
throw new FailException("#1");
}
catch (TestException) { }
try
{
int x = lz.Value;
throw new FailException("#2");
}
catch (TestException) { }
Assert.True(2 == invoke, "#3");
fail = false;
Assert.True(99 == lz.Value, "#4");
Assert.True(3 == invoke, "#5");
invoke = 0;
bool rec = true;
lz = new LazyExpiry <int>(() => { ++invoke; bool r = rec; rec = false; return(Tuple.Create(r ? lz.Value : 88, future)); }, LazyThreadSafetyMode.PublicationOnly);
Assert.True(88 == lz.Value, "#6");
Assert.True(2 == invoke, "#7");
}
public void NotThreadSafe()
{
var l2 = new LazyExpiry <int>(delegate() { return(Tuple.Create(42, future)); });
Assert.Equal(42, l2.Value);
}
public void Trivial_Lazy()
{
var x = new LazyExpiry <int>(Return22);
Assert.True(22 == x.Value, "#1");
}