public void ReadTest()
{
int siteNumber = 0;
DataManager target = new DataManager(siteNumber);
int dataItem = 2;
int transactionId = 0;
int timeStamp = 0;
int expected = 20;
int actual;
actual = target.Read(dataItem, transactionId, timeStamp);
Assert.AreEqual(expected, actual);
target.Write(2, 30, 2, 2);
target.CommitAllWrites(new Operation(Enumerations.OperationMode.Commit, 2, ts: 1));
actual = target.Read(dataItem, transactionId, timeStamp);
Assert.AreEqual(expected, actual);
timeStamp = 3;
expected = 30;
actual = target.Read(dataItem, transactionId, timeStamp);
Assert.AreEqual(expected, actual);
}
public void RecoverTest()
{
int siteNumber = 2;
DataManager target = new DataManager(siteNumber);
target.Write(2, 5, 1, 1);
// a different trasnaction reads the original data item
int actual = target.Read(2, 2);
Assert.AreEqual(20, actual);
// the same transaction will read the value it has written
actual = target.Read(2, 1);
Assert.AreEqual(5, actual);
// recover
target.Recover();
// same transaction can no longer see the value it ahs written (uncomitted value was lost)
actual = target.Read(2, 1);
Assert.AreEqual(20, actual);
// now write and commit, then recover
target.Write(2, 5, 1, 1);
target.CommitAllWrites(new Operation(Enumerations.OperationMode.Commit, 1, ts: 0));
target.Recover();
actual = target.Read(2, 1);
Assert.AreEqual(5, actual);
}
public void DeleteOldValuesTest()
{
int siteNumber = 0;
DataManager target = new DataManager(siteNumber);
int dataItem = 0;
int timeStamp = 2;
target.Write(2, 5, 1, timeStamp);
target.Write(4, 10, 1, timeStamp);
target.CommitAllWrites(new Operation(Enumerations.OperationMode.Commit, 1, ts: timeStamp));
timeStamp = 4;
target.Write(2, 10, 1, timeStamp);
target.Write(4, 10, 1, timeStamp);
target.CommitAllWrites(new Operation(Enumerations.OperationMode.Commit, 1, ts: timeStamp));
//Assert.AreEqual(3, target.DataItems[2].OldValues.Count);
//Assert.AreEqual(3, target.DataItems[4].OldValues.Count);
//target.DeleteOldValues(2, 3);
//Assert.AreEqual(1, target.DataItems[2].OldValues.Count);
//Assert.AreEqual(10, target.DataItems[2].OldValues[4]);
//target.DeleteOldValues(4, 1);
//Assert.AreEqual(2, target.DataItems[4].OldValues.Count);
//target.DeleteOldValues(4, 4);
//Assert.AreEqual(1, target.DataItems[4].OldValues.Count);
//Assert.AreEqual(10, target.DataItems[4].OldValues[4]);
}
