internal LockSession(ILockManagerImplementation manager, string path, object shardingID, string description = null, int?maxAgeSec = null)
{
if (path.IsNullOrWhiteSpace())
{
throw new LockingException(StringConsts.ARGUMENT_ERROR + "LockSession.ctor(path==null|empty)");
}
if (shardingID == null)
{
throw new LockingException(StringConsts.ARGUMENT_ERROR + "LockSession.ctor(shardingID==null)");
}
Data = new Server.LockSessionData(new LockSessionID(null), description, maxAgeSec);
Manager = manager;
Path = path;
ShardingID = shardingID;
try
{
var shardingHash = shardingID.GetHashCode();
var zone = manager.App.GetMetabase().CatalogReg.NavigateZone(Path);
var primaryZgovs = zone
.FindNearestParentZoneGovernors(iAmZoneGovernor: false, filter: (host) => !host.IsZGovLockFailover, transcendNOC: true)
.OrderBy(host => host.Name)
.ToArray();
if (primaryZgovs.Length < 1)
{
throw new LockingException(StringConsts.LOCK_SESSION_PATH_LEVEL_NO_ZGOVS_ERROR.Args(Path));
}
var failoverZgovs = zone
.FindNearestParentZoneGovernors(iAmZoneGovernor: false, filter: (host) => host.IsZGovLockFailover, transcendNOC: true)
.OrderBy(host => host.Name)
.ToArray();
if (failoverZgovs.Length > 0 &&
(primaryZgovs.Length != failoverZgovs.Length ||
!primaryZgovs[0].ParentZone.IsLogicallyTheSame(failoverZgovs[0].ParentZone))
)
{
throw new LockingException(StringConsts.LOCK_SESSION_ZGOV_SETUP_ERROR.Args(primaryZgovs[0].ParentZone.RegionPath));
}
var idx = (shardingHash & CoreConsts.ABS_HASH_MASK) % primaryZgovs.Length;
ServerHostPrimary = primaryZgovs[idx].RegionPath;
if (failoverZgovs.Length > 0)
{
ServerHostSecondary = failoverZgovs[idx].RegionPath;
}
}
catch (Exception error)
{
throw new LockingException(StringConsts.LOCK_SESSION_PATH_ERROR.Args(Path, error.ToMessageWithType()), error);
}
}
public LockTransactionResult ExecuteLockTransaction(LockSessionData session, LockTransaction transaction)
{
var result = executeLockTransaction(session, transaction);
if (m_InstrumentationEnabled)
{
var key = result.Status == LockStatus.TransactionOK ? "OK" //for speed not to concat strings
: result.Status.ToString() + ':' + result.ErrorCause.ToString();
m_stat_ExecuteTranCalls.IncrementLong(key);
}
return(result);
}
private LockTransactionResult executeLockTransaction(LockSessionData session, LockTransaction transaction)
{
if (!Running)
{
return(LockTransactionResult.CallFailed);
}
Interlocked.Increment(ref m_CurrentServerCalls);
if (session == null || transaction == null)
{
throw new LockingException(StringConsts.ARGUMENT_ERROR + GetType().Name + ".ExecuteLockTransaction(session|transaction==null)");
}
var isPing = transaction.Statements == null;
if (!isPing && transaction.Namespace.IsNullOrWhiteSpace())
{
throw new LockingException(StringConsts.ARGUMENT_ERROR + GetType().Name + ".ExecuteLockTransaction(transaction.Namespace==null|empty)");
}
var sapp = App.AsSky();
var currentTrustLevel = CurrentTrustLevel;
var appRunTimeSec = (uint)(DateTime.UtcNow - m_StartTimeUTC).TotalSeconds;
//insufficient runtime period length or trust level
if (transaction.MinimumRequiredRuntimeSec > appRunTimeSec ||
transaction.MinimumRequiredTrustLevel > currentTrustLevel)
{
return(new LockTransactionResult(transaction.ID,
sapp.HostName,
LockStatus.TransactionError,
LockErrorCause.MinimumRequirements,
null,
appRunTimeSec,
currentTrustLevel,
null));
}
var sid = session.ID.ToString();
var ss = m_Sessions.GetOrRegister(sid, (sd) => new ServerLockSession(sd), session);
lock (ss)
{
if (ss.Disposed)
{
return(new LockTransactionResult(transaction.ID,
sapp.HostName,
LockStatus.TransactionError,
LockErrorCause.SessionExpired,
null,
appRunTimeSec,
currentTrustLevel,
null));
}
ss.m_LastInteractionUTC = App.TimeSource.UTCNow;
if (isPing)//ping just touches session above
{
return(new LockTransactionResult(transaction.ID,
sapp.HostName,
LockStatus.TransactionOK,
LockErrorCause.Unspecified,
null,
appRunTimeSec,
currentTrustLevel,
null));
}
var ns = m_Namespaces.GetOrRegister <object>(transaction.Namespace, (_) => new Namespace(App, transaction.Namespace), null);
var ectx = new EvalContext(ss, ns, transaction);
prepareTransaction(ectx); //prepare is not under the lock
LockTransactionResult result;
lock (ns) //execute is UNDER THE LOCK
result = executeTransaction(ectx, appRunTimeSec, currentTrustLevel);
return(result);
}
}
internal ServerLockSession(LockSessionData data)
{
Data = data;
}
