private void AcquireLock()
{
ulong cas;
var lockPOCO = Get(LockKey, out cas);
if (lockPOCO != null)
{
CheckLockPocoIsMyLock(lockPOCO);
}
var storeKeyLock = new StoreKeyLock()
{
Expiry = Expires, WorkerId = WorkerId, IsConfirmed = true
};
Set(LockKey, storeKeyLock, cas);
}
private void CheckLockPocoIsMyLock(StoreKeyLock lockPOCO, bool isMyLock = false)
{
if (lockPOCO != null)
{
if (lockPOCO.Expiry >= DateTime.UtcNow)
{
if (WorkerId != lockPOCO.WorkerId)
{
throw new LockException("This worker " + WorkerId + " has already locked key " + LockKey);
}
else if (!isMyLock)
{
throw new LockException("Cannot acquire lock for " + LockKey + " as it has already been locked by " + WorkerId);
}
}
//otherwise the lock has expired so continue
}
else
{
throw new ArgumentNullException("Lock POCO is null");
}
}
private void Set(string key, StoreKeyLock value, ulong cas)
{
Provider.Set(key, Serializer.Serialize(value), cas);
}
private void Set(string key, StoreKeyLock value)
{
Provider.Set(key, Serializer.Serialize(value));
}
