/// <summary>
/// TM dies before receiving Done from all RMs, on recovery, TM should recommit
/// </summary>
public void TMFailsBeforeReceivingAllDone2PC()
{
StartUp();
Transaction t = WorkflowControl.Start();
TransactionManager.SelfDestruct(false, true);
WorkflowControl.AddCars(t, "Seattle", 10, 100);
ThreadPool.QueueUserWorkItem(o => WorkflowControl.Commit(t));
// TM shall be kill, now restart it
Console.Write("TM is killed, next is to restart it");
Pause();
StartTM();
// Wait to make sure all recover job is done
// shall see the transaction recommits.
t = WorkflowControl.Start();
string actual = PrintCars();
Assert.AreEqual("Vegas,1,3;NewYork,10,30;", actual);
actual = PrintRooms();
Assert.AreEqual("Vegas,2,1;NewYork,20,10;", actual);
actual = PrintFlights();
Assert.AreEqual("SEA->LAX,10,2;LAX->LAV,12,3;SEA->JFK,8,4;", actual);
actual = PrintCustomers();
Assert.AreEqual("", actual);
}
/// <summary>
/// Add an itinerary, kill RM before commit. Restart the RMs and you can see nothing changed (still c1 state). Demo shadow copy works after failure
/// </summary>
public void UncommittedScenario()
{
StartUp();
Console.WriteLine("Flight RM shall terminate before transaction commits. ");
Customer c = new Customer("12345678-1234-1234-1234-123456789012");
FlightsRM.SelfDestruct(2, 0, 0, 0);
string[] flights = new string[] { "SEA->LAX", "LAX->LAV" };
try
{
WorkflowControl.ReserveItinerary(c, flights, "Vegas", true, true);
}
catch (WebException e)
{
// Expected error because one of the RM will be selfdestroyed.
Console.WriteLine(e.Message);
}
Console.WriteLine("Restarting flight RM");
StartFlightsRM();
Transaction t = WorkflowControl.Start();
string actual = WorkflowControl.QueryItinerary(t, c);
Console.WriteLine(actual);
Assert.AreEqual("", actual);
actual = PrintCars();
Assert.AreEqual("Vegas,1,3;NewYork,10,30;", actual);
actual = PrintRooms();
Assert.AreEqual("Vegas,2,1;NewYork,20,10;", actual);
actual = PrintFlights();
Assert.AreEqual("SEA->LAX,10,2;LAX->LAV,12,3;SEA->JFK,8,4;", actual);
actual = PrintCustomers();
Assert.AreEqual("", actual);
}
/// <summary>
/// All RM prepared, one RM dies before receiving Commit, on recovery, the RM should recover the transaction, WC shouldn’t notice this
/// </summary>
public void ReCommitAfterRmFailTransaction2PC()
{
StartUp();
CarsRM.SelfDestruct(0, 0, 1, 0);
Customer c = new Customer("12345678-1234-1234-1234-123456789012");
string[] flights = new string[] { "SEA->LAX", "LAX->LAV" };
ThreadPool.QueueUserWorkItem(o => { Thread.Sleep(1000); CarsRM.SelfDestruct(0, 0, 0, 0); });
WorkflowControl.ReserveItinerary(c, flights, "Vegas", true, true);
// We shall see some commit retry message from TM but the transaction shall success.
Transaction t = WorkflowControl.Start();
string actual = WorkflowControl.QueryItinerary(t, c);
Console.WriteLine(actual);
Assert.AreEqual("F:SEA->LAX,F:LAX->LAV,C:Vegas,R:Vegas", actual);
actual = PrintCars();
Assert.AreEqual("Vegas,0,3;NewYork,10,30;", actual);
actual = PrintRooms();
Assert.AreEqual("Vegas,1,1;NewYork,20,10;", actual);
actual = PrintFlights();
Assert.AreEqual("SEA->LAX,9,2;LAX->LAV,11,3;SEA->JFK,8,4;", actual);
actual = PrintCustomers();
Assert.AreEqual("12345678-1234-1234-1234-123456789012;", actual);
}
/// <summary>
/// All RMs returns prepared, except one fails to prepare, the transaction should abort
/// </summary>
public void RollbackAfterRmFailTransaction2PC()
{
StartUp();
CarsRM.SelfDestruct(0, 1, 0, 0);
Customer c = new Customer("12345678-1234-1234-1234-123456789012");
string[] flights = new string[] { "SEA->LAX", "LAX->LAV" };
WorkflowControl.ReserveItinerary(c, flights, "Vegas", true, true);
// We shall see some rollback message from TM.
Console.WriteLine("One RM failed at prepare. TM will rollback all prepared RMs");
Pause();
Transaction t = WorkflowControl.Start();
string actual = WorkflowControl.QueryItinerary(t, c);
Console.WriteLine(actual);
Assert.AreEqual("", actual);
actual = PrintCars();
Assert.AreEqual("Vegas,1,3;NewYork,10,30;", actual);
actual = PrintRooms();
Assert.AreEqual("Vegas,2,1;NewYork,20,10;", actual);
actual = PrintFlights();
Assert.AreEqual("SEA->LAX,10,2;LAX->LAV,12,3;SEA->JFK,8,4;", actual);
actual = PrintCustomers();
Assert.AreEqual("", actual);
}
/// <summary>
/// T1, T2 write R1, T1 commit, T2 abort, see only T1's change in. Demo abort.
/// </summary>
public void ConcurrentCommitAbort()
{
StartUp();
Transaction t1 = WorkflowControl.Start();
Transaction t2 = WorkflowControl.Start();
AutoResetEvent sync1 = new AutoResetEvent(false);
AutoResetEvent sync2 = new AutoResetEvent(false);
ThreadPool.QueueUserWorkItem(o =>
{
WorkflowControl.AddCars(t1, "Seattle", 1, 3);
WorkflowControl.Commit(t1);
sync1.Set();
});
ThreadPool.QueueUserWorkItem(o =>
{
WorkflowControl.AddCars(t2, "Seattle", 2, 2);
WorkflowControl.Abort(t2);
sync2.Set();
});
// here is just to make sure t2 commits before t1, so the price will be 2.
sync1.WaitOne();
sync2.WaitOne();
string actual = PrintCars();
Assert.AreEqual("Vegas,1,3;NewYork,10,30;Seattle,1,3;", actual);
}
private void InitInventory()
{
Transaction t = WorkflowControl.Start();
WorkflowControl.AddCars(t, "Vegas", 1, 3);
WorkflowControl.AddRooms(t, "Vegas", 2, 1);
WorkflowControl.AddCars(t, "NewYork", 10, 30);
WorkflowControl.AddRooms(t, "NewYork", 20, 10);
WorkflowControl.AddSeats(t, "SEA->LAX", 10, 2);
WorkflowControl.AddSeats(t, "LAX->LAV", 12, 3);
WorkflowControl.AddSeats(t, "SEA->JFK", 8, 4);
WorkflowControl.Commit(t);
}
/// <summary>
/// Submit an itinerary with car, flight and hotel. Show the values are updated. Demo Read, write and commit.
/// </summary>
public void AddOneItinerary()
{
StartUp();
Customer c = new Customer("12345678-1234-1234-1234-123456789012");
string[] flights = new string[] { "SEA->LAX", "LAX->LAV" };
WorkflowControl.ReserveItinerary(c, flights, "Vegas", true, true);
Transaction t = WorkflowControl.Start();
string actual = WorkflowControl.QueryItinerary(t, c);
Console.WriteLine(actual);
Assert.AreEqual("F:SEA->LAX,F:LAX->LAV,C:Vegas,R:Vegas", actual);
actual = PrintCars();
Assert.AreEqual("Vegas,0,3;NewYork,10,30;", actual);
actual = PrintRooms();
Assert.AreEqual("Vegas,1,1;NewYork,20,10;", actual);
actual = PrintFlights();
Assert.AreEqual("SEA->LAX,9,2;LAX->LAV,11,3;SEA->JFK,8,4;", actual);
actual = PrintCustomers();
Assert.AreEqual("12345678-1234-1234-1234-123456789012;", actual);
}