private bool ReadAndAttach(
string partitionId,
string objectId,
string serverId,
string serverUrl,
out string value)
{
if (!timestamps.TryGetValue(partitionId, out MutableVectorClock timestamp))
{
timestamp = MutableVectorClock.Empty();
timestamps.Add(partitionId, timestamp);
}
if (AdvancedGrpcMessageLayer.Instance.Read(
serverUrl,
partitionId,
objectId,
out value,
timestamp.ToImmutable(),
out ImmutableVectorClock replicaTimestamp) &&
value != null)
{
timestamp.Merge(replicaTimestamp);
attachedId = serverId;
return(true);
}
return(false);
}
public void OnJoinPartitionRequest(JoinPartitionArguments arguments)
{
string partitionId = arguments.PartitionId;
partitionsDB.JoinPartition(arguments);
partitionsDB.TryGetPartition(partitionId, out ImmutableHashSet <string> serverIds);
// Only register partitions that the server belongs to for broadcast
if (serverIds.Contains(serverConfig.ServerId))
{
valueTimestamps.TryAdd(partitionId, MutableVectorClock.Empty());
emitedWritesTimestamps.TryAdd(partitionId, MutableVectorClock.Empty());
ReliableBroadcastLayer.Instance.RegisterPartition(partitionId, serverIds);
}
}
public bool Write(
string partitionId,
string objectId,
string value)
{
if (!namingService.ListPartition(partitionId, out ImmutableHashSet <string> serverIds))
{
return(false);
}
if (!timestamps.TryGetValue(partitionId, out MutableVectorClock timestamp))
{
timestamp = MutableVectorClock.Empty();
timestamps.Add(partitionId, timestamp);
}
foreach (string serverId in serverIds)
{
ImmutableVectorClock replicaTimestamp = null;
bool success = namingService.Lookup(serverId, out string serverUrl) &&
AdvancedGrpcMessageLayer.Instance.Write(
serverUrl,
partitionId,
objectId,
value,
timestamp.ToImmutable(),
out replicaTimestamp);
if (success)
{
timestamp.Merge(replicaTimestamp);
return(true);
}
}
return(false);
}