public void TestMVCC()
{
Site target = new Site(1);
// Setup the site
target.AddMessage(new Operation(Enumerations.OperationMode.Write, 1, 2, 5));
target.AddMessage(new Operation(Enumerations.OperationMode.Commit, 1, 2, ts:1));
target.AddMessage(new Operation(Enumerations.OperationMode.Read, 2, 2, ro: true, ts: 0));
List<Result> actual = target.Tick();
Result ROResult = actual.Find(matching => matching.IssuingTransaction == 2);
// RO should have read the original value of data item 2
Assert.AreEqual(20, ROResult.Val);
target.AddMessage(new Operation(Enumerations.OperationMode.Write, 3, 2, 50));
target.AddMessage(new Operation(Enumerations.OperationMode.Commit, 3, 2, ts: 2));
target.AddMessage(new Operation(Enumerations.OperationMode.Read, 4, 2, ro: true, ts: 2));
target.AddMessage(new Operation(Enumerations.OperationMode.Read, 5, 2, ro: true, ts: 0));
target.AddMessage(new Operation(Enumerations.OperationMode.Read, 6, 2, ro: true, ts: 3));
actual = target.Tick();
// transaction ID 4 has issued a read command with ts = 2, so it should read 5 (value committed at time 0, before ts=1)
ROResult = actual.Find(matching => matching.IssuingTransaction == 4);
Assert.AreEqual(5, ROResult.Val);
// transaction ID 5 has issued a read command with ts = 0, so it should read 20 (original value)
ROResult = actual.Find(matching => matching.IssuingTransaction == 5);
Assert.AreEqual(20, ROResult.Val);
// Transaction ID 6 has issued a read command with ts = 3, so it should read 50
ROResult = actual.Find(matching => matching.IssuingTransaction == 6);
Assert.AreEqual(50, ROResult.Val);
// a transction should read values written BEFORE its timestamp
target.AddMessage(new Operation(Enumerations.OperationMode.Write, 7, 4, 4));
target.AddMessage(new Operation(Enumerations.OperationMode.Commit, 7, ts: 1));
target.AddMessage(new Operation(Enumerations.OperationMode.Read, 8, 4, ro: true, ts: 1));
actual = target.Tick();
ROResult = actual.Find(matching => matching.IssuingTransaction == 8);
Assert.AreEqual(40, ROResult.Val);
}
public void TickTest()
{
Site target = new Site(1);
// setup the site
target.AddMessage(new Operation(Enumerations.OperationMode.Begin, 1));
target.AddMessage(new Operation(Enumerations.OperationMode.Read, 1, 2));
target.AddMessage(new Operation(Enumerations.OperationMode.Write, 1, 2, 40));
target.AddMessage(new Operation(Enumerations.OperationMode.Read, 2, 2));
target.AddMessage(new Operation(Enumerations.OperationMode.Write, 2, 4, 30));
target.AddMessage(new Operation(Enumerations.OperationMode.Read, 2, 4));
List<Result> actual = target.Tick();
List<Result> expected = new List<Result>();
expected.Add(new Result(1, Enumerations.OperationMode.Begin, 1, Enumerations.ResultStatus.Success,
new List<int>() {1}));
expected.Add(new Result(1, Enumerations.OperationMode.Read, 1, Enumerations.ResultStatus.Success,
new List<int>() {1}, 20, 2));
expected.Add(new Result(1, Enumerations.OperationMode.Write, 1, Enumerations.ResultStatus.Success,
new List<int>() {1}, dataItem: 2));
expected.Add(new Result(2, Enumerations.OperationMode.Read, 1, Enumerations.ResultStatus.Failure,
new List<int>() {1}, 0, 2));
expected.Add(new Result(2, Enumerations.OperationMode.Write, 1, Enumerations.ResultStatus.Success,
new List<int>() {2}, 0, 4));
expected.Add(new Result(2, Enumerations.OperationMode.Read, 1, Enumerations.ResultStatus.Success,
new List<int>() {2}, 30, 4));
for (int i = 0; i < Math.Max(actual.Count, expected.Count); i++)
{
Assert.AreEqual(expected[i].DataItem, actual[i].DataItem);
Assert.AreEqual(expected[i].Status, actual[i].Status);
Assert.AreEqual(expected[i].TransId[0], actual[i].TransId[0]);
Assert.AreEqual(expected[i].Val, actual[i].Val);
Assert.AreEqual(1, actual[i].SiteNumber);
Assert.AreEqual(expected[i].OpMode, actual[i].OpMode);
}
// Nothing should be returned because:
// a. no new operations were enqueued and
// b. no data items became free because of operations
actual = target.Tick();
Assert.AreEqual(0, actual.Count);
// make (1) release all locks and commit all values
// thus (2) can read data item 1 and should read the value committed by (1)
target.AddMessage(new Operation(Enumerations.OperationMode.Commit, 1));
target.AddMessage(new Operation(Enumerations.OperationMode.Read, 2, 2));
actual = target.Tick();
expected = new List<Result>();
expected.Add(new Result(1, Enumerations.OperationMode.Commit, 1, Enumerations.ResultStatus.Success,
new List<int>() {1}, dataItem:-1));
expected.Add(new Result(1, Enumerations.OperationMode.Read, 1, Enumerations.ResultStatus.Success,
new List<int>() {2}, 40, 2));
for (int i = 0; i < Math.Max(actual.Count, expected.Count); i++)
{
Assert.AreEqual(expected[i].DataItem, actual[i].DataItem);
Assert.AreEqual(expected[i].Status, actual[i].Status);
Assert.AreEqual(expected[i].TransId[0], actual[i].TransId[0]);
Assert.AreEqual(expected[i].Val, actual[i].Val);
Assert.AreEqual(1, actual[i].SiteNumber);
Assert.AreEqual(expected[i].OpMode, actual[i].OpMode);
}
}
/// <summary>
/// Date: 12/3/2011
/// A wrapper for site.AddMessage
/// </summary>
/// <param name = "site">The site.</param>
/// <param name = "op">The op.</param>
private void SendOpToSite(Site site, Operation op)
{
site.AddMessage(op);
}