public void LockCancellationToken_IsCancelled_AfterLosingLock()
{
var config = new RemoteLockerTesterConfig
{
LockersCount = 1,
LocalRivalOptimization = LocalRivalOptimization.Disabled,
LockTtl = TimeSpan.FromSeconds(5),
LockMetadataTtl = TimeSpan.FromMinutes(1),
KeepLockAliveInterval = TimeSpan.FromSeconds(3),
ChangeLockRowThreshold = 10,
TimestampProviderStochasticType = TimestampProviderStochasticType.None,
CassandraClusterSettings = SingleCassandraNodeSetUpFixture.CreateCassandraClusterSettings(attempts: 1, timeout: TimeSpan.FromSeconds(1)),
};
using (var tester = new RemoteLockerTester(config))
{
var lockId = Guid.NewGuid().ToString();
using (var lock1 = tester[0].Lock(lockId))
{
Assert.That(lock1.LockAliveToken.IsCancellationRequested, Is.False);
// waiting more than LockTtl * 0.5 with no lock prolongation
Thread.Sleep(config.KeepLockAliveInterval);
Assert.That(lock1.LockAliveToken.IsCancellationRequested, Is.True);
}
}
}
public void LockIsKeptAlive_Failure()
{
var config = new RemoteLockerTesterConfig
{
LockersCount = 2,
LocalRivalOptimization = LocalRivalOptimization.Disabled,
LockTtl = TimeSpan.FromSeconds(5),
LockMetadataTtl = TimeSpan.FromMinutes(1),
KeepLockAliveInterval = TimeSpan.FromSeconds(10),
ChangeLockRowThreshold = 10,
TimestampProviderStochasticType = TimestampProviderStochasticType.None,
CassandraClusterSettings = SingleCassandraNodeSetUpFixture.CreateCassandraClusterSettings(attempts: 1, timeout: TimeSpan.FromSeconds(1)),
};
using (var tester = new RemoteLockerTester(config))
{
var lockId = Guid.NewGuid().ToString();
var lock1 = tester[0].Lock(lockId);
Thread.Sleep(TimeSpan.FromSeconds(3));
Assert.That(tester[1].TryGetLock(lockId, out var lock2), Is.False);
Thread.Sleep(TimeSpan.FromSeconds(4)); // waiting in total: 3 + 4 = 1*1 + 5 + 1 sec
Assert.That(tester[1].TryGetLock(lockId, out lock2), Is.True);
lock2.Dispose();
lock1.Dispose();
}
}
public RemoteLockerTester(RemoteLockerTesterConfig config = null)
{
config = config ?? RemoteLockerTesterConfig.Default();
var localRivalOptimizationIsEnabled = config.LocalRivalOptimization != LocalRivalOptimization.Disabled;
var serializer = new Serializer(new AllPropertiesExtractor(), null, GroBufOptions.MergeOnRead);
ICassandraCluster cassandraCluster = new CassandraCluster(config.CassandraClusterSettings, logger);
if (config.CassandraFailProbability.HasValue)
{
cassandraCluster = new FailedCassandraCluster(cassandraCluster, config.CassandraFailProbability.Value);
}
var timestampProvider = new StochasticTimestampProvider(config.TimestampProviderStochasticType, config.LockTtl);
var implementationSettings = new CassandraRemoteLockImplementationSettings(timestampProvider, SingleCassandraNodeSetUpFixture.RemoteLockKeyspace, SingleCassandraNodeSetUpFixture.RemoteLockColumnFamily, config.LockTtl, config.LockMetadataTtl, config.KeepLockAliveInterval, config.ChangeLockRowThreshold);
var cassandraRemoteLockImplementation = new CassandraRemoteLockImplementation(cassandraCluster, serializer, implementationSettings);
remoteLockers = new RemoteLocker[config.LockersCount];
remoteLockerMetrics = new RemoteLockerMetrics("dummyKeyspace");
if (localRivalOptimizationIsEnabled)
{
var remoteLocker = new RemoteLocker(cassandraRemoteLockImplementation, remoteLockerMetrics, logger);
for (var i = 0; i < config.LockersCount; i++)
{
remoteLockers[i] = remoteLocker;
}
}
else
{
for (var i = 0; i < config.LockersCount; i++)
{
remoteLockers[i] = new RemoteLocker(new CassandraRemoteLockImplementation(cassandraCluster, serializer, implementationSettings), remoteLockerMetrics, logger);
}
}
// it is important to use another CassandraCluster (with another setting of attempts, for example)
cassandraRemoteLockImplementationForCheckings = new CassandraRemoteLockImplementation(new CassandraCluster(SingleCassandraNodeSetUpFixture.CreateCassandraClusterSettings(), logger), serializer, implementationSettings);
}