// case 5 or 6.
public async Task FailedTransactionWillBeRetriedOnNewEvent()
{
var persistentCollector = new TestPersistentCollectorFailure();
var persistentCollectors = new List <IPersistentCollector>()
{
persistentCollector
};
var eventCollector = new EventCollector(persistentCollectors);
var partitionId = new Guid();
persistentCollector.DontAcceptChangesNow();
await Assert.ThrowsAnyAsync <Exception>(async() =>
await eventCollector.TransactionApplied(partitionId, 0, 1, this.Data));
persistentCollector.AcceptChangesNow();
await eventCollector.TransactionApplied(partitionId, 1, 2, this.Data);
var changes = persistentCollector.Changes;
Assert.True(1 == changes.Count);
Assert.Equal(2, changes[0].Transactions.Count);
Assert.Equal(1, changes[0].Transactions[0].Lsn);
Assert.Equal(2, changes[0].Transactions[1].Lsn);
}
// case 7 and more :)
public async Task RandomizedRealWorldTest()
{
var persistentCollector = new TestPersistentCollectorFailure();
var persistentCollectors = new List <IPersistentCollector>()
{
persistentCollector
};
var eventCollector = new EventCollector(persistentCollectors);
var partitionId = new Guid();
var rand = new Random();
const int MaxTimeToWaitInMs = 1000 * 20; // 20 seconds of test
Func <Task> randomPCFailureFunc = async() => {
var watch = Stopwatch.StartNew();
while (watch.ElapsedMilliseconds < MaxTimeToWaitInMs)
{
if (rand.Next(0, 10) < 3) // fail upload 30% time.
{
persistentCollector.DontAcceptChangesNow();
}
else
{
persistentCollector.AcceptChangesNow();
}
await Task.Delay(rand.Next(3, 20));
}
};
var lsnTaskDict = new Dictionary <long, Task>();
var lsn = 0;
Func <Task> addEvents = async() => {
var watch = Stopwatch.StartNew();
while (watch.ElapsedMilliseconds < MaxTimeToWaitInMs)
{
var t = eventCollector.TransactionApplied(partitionId, lsn - 1, lsn, this.Data);
lsnTaskDict.Add(lsn, t);
lsn += 1;
if (rand.Next(0, 10) < 4) // sleep 40% time.
{
await Task.Delay(rand.Next(0, 10));
}
}
};
Task.WaitAll(new Task[] { randomPCFailureFunc(), addEvents() });
persistentCollector.AcceptChangesNow();
await eventCollector.TransactionApplied(partitionId, lsn - 1, lsn, this.Data);
var changes = persistentCollector.Changes;
var allTransactions = changes.SelectMany((pc) => pc.Transactions).ToList();
var monotinicallyIncreasingLsns = allTransactions.Zip(allTransactions.Skip(1), (t1, t2) => t1.Lsn + 1 == t2.Lsn)
.All(b => b == true);
Assert.True(monotinicallyIncreasingLsns, "Some transaction is lost.");
Assert.True(allTransactions[0].Lsn == 0, "First lsn is not right");
Assert.True(allTransactions.Last().Lsn == lsn, "Last lsn is not right");
}