public void TestWriteLock()
{
var systemClock = new SystemClock();
var site = new Site(1, new SiteList(systemClock), systemClock);
var tempVariable = new Variable(1, site, systemClock);
var transactionOne = new Transaction("T1", systemClock);
var transactionTwo = new Transaction("T2", systemClock);
var result = tempVariable.GetWriteLock(transactionOne);
Assert.IsTrue(result.Contains(transactionOne));
Assert.IsTrue(tempVariable.WriteLockHolder == transactionOne);
var resultTwo = tempVariable.GetReadLock(transactionTwo);
Assert.IsFalse(resultTwo.Contains(transactionTwo));
Assert.IsTrue(resultTwo.Contains(transactionOne));
var resultThree = tempVariable.GetWriteLock(transactionTwo);
Assert.IsFalse(resultThree.Contains(transactionTwo));
Assert.IsTrue(resultThree.Contains(transactionOne));
tempVariable.RemoveWriteLock(transactionOne);
Assert.IsTrue(tempVariable.WriteLockHolder == null);
}
/// <summary>
/// Initializes a copy of a variable class.
/// </summary>
/// <param name="tempVariable">The temp variable.</param>
public Variable(Variable tempVariable)
{
throw new NotImplementedException();
SystemClock = tempVariable.SystemClock;
VariableHistory = new List<VariableValue>();
Id = tempVariable.Id;
foreach (VariableValue tempValue in tempVariable.VariableHistory)
VariableHistory.Add(tempValue);
}
/// <summary>
/// If the transaction should abort, if not, it waits.
/// </summary>
/// <param name="variableToAccess">The variable to access.</param>
/// <param name="transactionSeekingLock">The transaction seeking lock.</param>
public static bool ShouldAbort(Variable variableToAccess, Transaction transactionSeekingLock)
{
bool shouldAbort = false;
//if we try to access a lock held by an older transaction
if (variableToAccess.WriteLockHolder != null && variableToAccess.WriteLockHolder.StartTime < transactionSeekingLock.StartTime)
return true; //we abort
else
{
//if we are waiting on a younger transaction to finish
if (variableToAccess.WriteLockHolder != null && variableToAccess.WriteLockHolder.StartTime > transactionSeekingLock.StartTime)
shouldAbort = false;
//check the read locks
foreach (Transaction tempTrans in variableToAccess.ReadLockHolders)
{
if (tempTrans.StartTime < transactionSeekingLock.StartTime)
shouldAbort = true;
}
}
return shouldAbort;
}
public void TestVariableResetOnFailure()
{
var systemClock = new SystemClock();
var site = new Site(1, new SiteList(systemClock), systemClock);
var variable = new Variable(1, site, systemClock);
var transactionOne = new Transaction("T1", systemClock);
variable.GetReadLock(transactionOne);
variable.GetWriteLock(transactionOne);
Assert.IsTrue(variable.IsReadLocked);
Assert.IsTrue(variable.IsWriteLocked);
Assert.IsTrue(variable.ReadLockHolders.Contains(transactionOne));
Assert.IsTrue(variable.WriteLockHolder == transactionOne);
variable.ResetToComitted();
Assert.IsFalse(variable.IsReadLocked);
Assert.IsFalse(variable.IsWriteLocked);
Assert.IsFalse(variable.ReadLockHolders.Contains(transactionOne));
Assert.IsFalse(variable.WriteLockHolder == transactionOne);
}
public void TestAcquireAndRemoveReadLock()
{
var systemClock = new SystemClock();
var site = new Site(1, new SiteList(systemClock), systemClock);
var tempVariable = new Variable(1, site, systemClock);
var transactionOne = new Transaction("T1", systemClock);
var transactionTwo = new Transaction("T2", systemClock);
var result = tempVariable.GetReadLock(transactionOne);
Assert.IsTrue(result.Contains(transactionOne));
var result2 = tempVariable.GetReadLock(transactionTwo);
Assert.IsTrue(result.Contains(transactionOne));
Assert.IsTrue(result.Contains(transactionTwo));
tempVariable.RemoveReadLock(transactionOne);
Assert.IsFalse(tempVariable.ReadLockHolders.Contains(transactionOne));
tempVariable.RemoveReadLock(transactionTwo);
Assert.IsFalse(tempVariable.ReadLockHolders.Contains(transactionTwo));
}
//[TestMethod]
public void TestMethod1()
{
var systemClock = new SystemClock();
var siteList = new SiteList(systemClock);
var siteOne = new Site(1, siteList, systemClock);
var siteTwo = new Site(2, siteList, systemClock);
siteList.AddSite(siteOne);
siteList.AddSite(siteTwo);
var variableOne = new Variable(2, siteOne, systemClock);
var variableTwo = new Variable(2, siteTwo, systemClock);
var transaction = new Transaction("test", systemClock);
siteOne.VariableList.Add(variableOne);
siteTwo.VariableList.Add(variableTwo);
Assert.IsTrue(variableOne.GetWriteLock(transaction).Contains(transaction));
Assert.IsTrue(variableTwo.GetWriteLock(transaction).Contains(transaction));
variableOne.Set("5");
variableOne.CommitValue();
variableOne.Set("4");
var affectedTranasactions = siteOne.Fail();
Assert.IsTrue(siteOne.IsFailed);
siteOne.Recover();
Assert.IsTrue(affectedTranasactions.Contains(transaction));
Assert.IsTrue(
transaction.AwaitingReReplication.Contains(new ValueSitePair() { Site = siteOne, Variable = variableOne }));
Assert.IsFalse(siteOne.IsFailed);
}
public bool Equals(Variable obj)
{
return obj.Id == this.Id;
}
