public void CheckpointableStateManager_UnloadCanBeRetried()
{
var i = 0;
var fail = true;
var e = new TestEngine(
(_, ct, p) => Task.FromResult(true),
(_, ct, p) => Task.FromResult(true),
async p =>
{
if (Volatile.Read(ref fail))
{
var j = Interlocked.Increment(ref i) - 1;
throw new Exception("Oops! " + j);
}
await Task.Yield();
}
);
var s = new CheckpointableStateManager(e, new Uri("qe:/test"), traceSource: null);
try
{
s.UnloadAsync().Wait();
Assert.Fail();
}
catch (AggregateException ex)
{
ex.Handle(err => err.Message == "Oops! 0");
}
Assert.ThrowsExceptionAsync <InvalidOperationException>(() => s.CheckpointAsync(new TestWriter())).Wait();
Assert.ThrowsExceptionAsync <InvalidOperationException>(() => s.RecoverAsync(new TestReader())).Wait();
try
{
s.UnloadAsync().Wait();
Assert.Fail();
}
catch (AggregateException ex)
{
ex.Handle(err => err.Message == "Oops! 1");
}
Assert.ThrowsExceptionAsync <InvalidOperationException>(() => s.CheckpointAsync(new TestWriter())).Wait();
Assert.ThrowsExceptionAsync <InvalidOperationException>(() => s.RecoverAsync(new TestReader())).Wait();
Volatile.Write(ref fail, false);
s.UnloadAsync().Wait();
Assert.AreEqual(2, Volatile.Read(ref i));
Assert.ThrowsExceptionAsync <InvalidOperationException>(() => s.CheckpointAsync(new TestWriter())).Wait();
Assert.ThrowsExceptionAsync <InvalidOperationException>(() => s.RecoverAsync(new TestReader())).Wait();
s.UnloadAsync().Wait();
Assert.AreEqual(2, Volatile.Read(ref i));
}
public void CheckpointableStateManager_CheckpointCanBeCancelled()
{
var busy = new TaskCompletionSource <bool>();
var done = new TaskCompletionSource <bool>();
var cancelled = false;
var e = new TestEngine(
async(_, ct, p) => { ct.Register(() => cancelled = true); busy.SetResult(true); await done.Task; },
(_, ct, p) => Task.FromResult(true),
(p) => Task.FromResult(true)
);
var s = new CheckpointableStateManager(e, new Uri("qe:/test"), traceSource: null);
var cts = new CancellationTokenSource();
var t = s.CheckpointAsync(new TestWriter(), cts.Token);
busy.Task.Wait();
cts.Cancel();
done.SetResult(true);
t.Wait();
Assert.IsTrue(cancelled);
}
public void CheckpointableStateManager_UnloadDuringCheckpointQueuesUp()
{
var checkpointDone = new TaskCompletionSource <bool>();
var checkpointing = false;
var unloading = false;
var e = new TestEngine(
(_, ct, p) => { checkpointing = true; return(checkpointDone.Task); },
(_, ct, p) => Task.FromResult(true),
(p) => { unloading = true; return(Task.FromResult(true)); }
);
var s = new CheckpointableStateManager(e, new Uri("qe:/test"), traceSource: null);
var c = s.CheckpointAsync(new TestWriter());
Assert.IsTrue(checkpointing);
var u1 = s.UnloadAsync();
Assert.IsFalse(unloading);
var u2 = s.UnloadAsync();
Assert.IsFalse(unloading);
checkpointDone.SetResult(true);
c.Wait();
Assert.IsTrue(unloading);
u1.Wait();
u2.Wait();
}
public void CheckpointableStateManager_ErrorDuringCheckpointKeepsEngineRunning()
{
var fail = true;
var e = new TestEngine(
async(_, ct, p) =>
{
if (Volatile.Read(ref fail))
{
throw new ArithmeticException("Oops!");
}
await Task.Yield();
},
(_, ct, p) => Task.FromResult(true),
(p) => Task.FromResult(true)
);
var s = new CheckpointableStateManager(e, new Uri("qe:/test"), traceSource: null);
Assert.AreEqual(QueryEngineStatus.Running, s.Status);
Assert.ThrowsExceptionAsync <ArithmeticException>(() => s.CheckpointAsync(new TestWriter())).Wait();
Assert.AreEqual(QueryEngineStatus.Running, s.Status);
Assert.ThrowsExceptionAsync <ArithmeticException>(() => s.CheckpointAsync(new TestWriter())).Wait();
Assert.AreEqual(QueryEngineStatus.Running, s.Status);
Volatile.Write(ref fail, false);
s.CheckpointAsync(new TestWriter()).Wait();
Assert.AreEqual(QueryEngineStatus.Running, s.Status);
}
public void CheckpointableStateManager_CheckpointCanBeCancelledImmediately()
{
var e = new TestEngine(
(_, ct, p) => Task.FromResult(true),
(_, ct, p) => Task.FromResult(true),
(p) => Task.FromResult(true)
);
var s = new CheckpointableStateManager(e, new Uri("qe:/test"), traceSource: null);
var cts = new CancellationTokenSource();
cts.Cancel();
Assert.ThrowsExceptionAsync <OperationCanceledException>(() => s.CheckpointAsync(new TestWriter(), cts.Token)).Wait();
}
public void CheckpointableStateManager_StateWriterWrapper()
{
var engine = new WriterTestEngine();
var writer = new TestWriter();
var s = new CheckpointableStateManager(engine, new Uri("qe:/test"), traceSource: null);
s.CheckpointAsync(writer).Wait();
Assert.IsTrue(writer.Log.SequenceEqual(new[]
{
"GetItemWriter(foo, bar)",
"DeleteItem(qux, baz)",
"Rollback()",
"CommitAsync()",
"Dispose()",
}));
}
public void CheckpointableStateManager_UnloadDuringCheckpointCausesWriterShutdown()
{
var checkpointDone = new TaskCompletionSource <bool>();
var unloadStarted = new TaskCompletionSource <bool>();
var checkpointing = false;
var unloading = false;
var e = new TestEngine(
async(w, ct, p) =>
{
checkpointing = true;
await unloadStarted.Task;
Assert.ThrowsException <EngineUnloadedException>(() => w.DeleteItem("foo", "bar"));
Assert.ThrowsException <EngineUnloadedException>(() => w.GetItemWriter("foo", "bar"));
Assert.ThrowsException <EngineUnloadedException>(() => w.Rollback());
await Assert.ThrowsExceptionAsync <EngineUnloadedException>(() => w.CommitAsync());
await checkpointDone.Task;
},
(_, ct, p) => Task.FromResult(true),
(p) => { unloading = true; return(Task.FromResult(true)); }
);
var s = new CheckpointableStateManager(e, new Uri("qe:/test"), traceSource: null);
var c = s.CheckpointAsync(new TestWriter());
Assert.IsTrue(checkpointing);
var u = s.UnloadAsync();
Assert.IsFalse(unloading);
unloadStarted.SetResult(true);
checkpointDone.SetResult(true);
c.Wait();
Assert.IsTrue(unloading);
u.Wait();
}