/// <summary>
/// Returns a list of activations (along with the version number of the list) for the given grain.
/// If the grain is not found, null is returned.
/// </summary>
/// <param name="grain"></param>
/// <returns></returns>
internal AddressesAndTag LookUpActivations(GrainId grain)
{
var result = new AddressesAndTag();
lock (lockable)
{
IGrainInfo graininfo;
if (partitionData.TryGetValue(grain, out graininfo))
{
result.Addresses = new List<ActivationAddress>();
result.VersionTag = partitionData[grain].VersionTag;
foreach (var route in partitionData[grain].Instances)
{
if (IsValidSilo(route.Value.SiloAddress))
result.Addresses.Add(ActivationAddress.GetAddress(route.Value.SiloAddress, grain, route.Key));
}
}
}
return result;
}
/// <summary>
/// Returns a list of activations (along with the version number of the list) for the given grain.
/// If the grain is not found, null is returned.
/// </summary>
/// <param name="grain"></param>
/// <returns></returns>
internal AddressesAndTag LookUpActivations(GrainId grain)
{
var result = new AddressesAndTag();
ActivationId[] activationIds;
IActivationInfo[] activationInfos;
const int arrayReusingThreshold = 100;
int grainInfoInstancesCount;
lock (lockable)
{
IGrainInfo graininfo;
if (!partitionData.TryGetValue(grain, out graininfo))
{
return result;
}
result.VersionTag = graininfo.VersionTag;
grainInfoInstancesCount = graininfo.Instances.Count;
if (grainInfoInstancesCount < arrayReusingThreshold)
{
if ((activationIds = activationIdsHolder) == null)
{
activationIdsHolder = activationIds = new ActivationId[arrayReusingThreshold];
}
if ((activationInfos = activationInfosHolder) == null)
{
activationInfosHolder = activationInfos = new IActivationInfo[arrayReusingThreshold];
}
}
else
{
activationIds = new ActivationId[grainInfoInstancesCount];
activationInfos = new IActivationInfo[grainInfoInstancesCount];
}
graininfo.Instances.Keys.CopyTo(activationIds, 0);
graininfo.Instances.Values.CopyTo(activationInfos, 0);
}
result.Addresses = new List<ActivationAddress>(grainInfoInstancesCount);
for (var i = 0; i < grainInfoInstancesCount; i++)
{
var activationInfo = activationInfos[i];
if (IsValidSilo(activationInfo.SiloAddress))
{
result.Addresses.Add(ActivationAddress.GetAddress(activationInfo.SiloAddress, grain, activationIds[i]));
}
activationInfos[i] = null;
activationIds[i] = null;
}
return result;
}
public bool FastLookup(GrainId grain, out AddressesAndTag addresses)
{
return directory.LocalLookup(grain, out addresses) && addresses.Addresses != null && addresses.Addresses.Count > 0;
// NOTE: only check with the local directory cache.
// DO NOT check in the local activations TargetDirectory!!!
// The only source of truth about which activation should be legit to is the state of the ditributed directory.
// Everyone should converge to that (that is the meaning of "eventualy consistency - eventualy we converge to one truth").
// If we keep using the local activation, it may not be registered in th directory any more, but we will never know that and keep using it,
// thus volaiting the single-activation semantics and not converging even eventualy!
}
/// <summary>
/// Returns a list of activations (along with the version number of the list) for the given grain.
/// If the grain is not found, null is returned.
/// </summary>
/// <param name="grain"></param>
/// <returns></returns>
internal AddressesAndTag LookUpGrain(GrainId grain)
{
var result = new AddressesAndTag();
lock (lockable)
{
if (partitionData.ContainsKey(grain))
{
result.Addresses = new List<ActivationAddress>();
result.VersionTag = partitionData[grain].VersionTag;
foreach (var route in partitionData[grain].Instances.Where(route => IsValidSilo(route.Value.SiloAddress)))
{
result.Addresses.Add(ActivationAddress.GetAddress(route.Value.SiloAddress, grain, route.Key, route.Value.RegistrationStatus));
}
}
}
return result;
}
