public void NestedTransactionAndRollback()
{
var needleA = Transact.CreateNeedle(5);
var needleB = Transact.CreateNeedle(1);
var thread = new Thread(() =>
{
using (var transaction = new Transact())
{
needleB.Value = 2;
transaction.Commit();
using (var transact = new Transact())
{
needleA.Value = 9;
Assert.AreEqual(9, needleA.Value);
Assert.AreEqual(2, needleB.Value);
transact.Commit();
}
Assert.AreEqual(9, needleA.Value);
Assert.AreEqual(2, needleB.Value);
transaction.Rollback();
Assert.AreEqual(5, needleA.Value);
Assert.AreEqual(2, needleB.Value);
using (new Transact())
{
needleA.Value = 13;
Assert.AreEqual(13, needleA.Value);
Assert.AreEqual(2, needleB.Value);
transaction.Rollback();
Assert.AreEqual(5, needleA.Value);
Assert.AreEqual(2, needleB.Value);
}
needleA.Value = 15;
transaction.Commit();
}
});
thread.Start();
thread.Join();
Assert.AreEqual(15, needleA.Value);
Assert.AreEqual(2, needleB.Value);
}
public void MultipleCommit() // TODO: Review
{
var needle = Transact.CreateNeedle(1);
using (var autoResetEvent = new AutoResetEvent(false))
{
new Thread
(
() =>
{
using (var transaction = new Transact())
{
needle.Value = 2;
transaction.Commit();
needle.Value = 3;
transaction.Commit();
needle.Value = 5;
transaction.Rollback();
autoResetEvent.Set();
}
}
).Start();
autoResetEvent.WaitOne();
Assert.AreEqual(3, needle.Value);
}
}
public void Rollback()
{
var needleA = Transact.CreateNeedle(5);
var needleB = Transact.CreateNeedle(5);
try
{
using (var transact = new Transact())
{
const int Movement = 2;
needleA.Value += Movement;
ThrowException();
// Really, it is evident this code will not run
needleB.Value -= Movement;
transact.Commit();
}
}
catch (Exception exception)
{
// Catch'em all
GC.KeepAlive(exception);
}
// We did not commit
Assert.AreEqual(5, needleA.Value);
Assert.AreEqual(5, needleB.Value);
//---
using (var transact = new Transact())
{
needleA.Value = 9;
Assert.AreEqual(9, needleA.Value);
Assert.AreEqual(5, needleB.Value);
transact.Rollback();
Assert.AreEqual(5, needleA.Value);
Assert.AreEqual(5, needleB.Value);
}
// We did rollback
Assert.AreEqual(5, needleA.Value);
Assert.AreEqual(5, needleB.Value);
using (var transact = new Transact())
{
needleA.Value = 9;
Assert.AreEqual(9, needleA.Value);
Assert.AreEqual(5, needleB.Value);
transact.Rollback();
Assert.AreEqual(5, needleA.Value);
Assert.AreEqual(5, needleB.Value);
needleA.Value = 11;
Assert.AreEqual(11, needleA.Value);
Assert.AreEqual(5, needleB.Value);
transact.Commit();
}
// We did rollback and commit again
Assert.AreEqual(11, needleA.Value);
Assert.AreEqual(5, needleB.Value);
}