internal CRAErrorCode InstantiateVertex(string instanceName, string vertexName, string vertexDefinition, object vertexParameter, bool sharded)
{
var procDefRow = VertexTable.GetRowForVertexDefinition(_vertexTable, vertexDefinition);
string blobName = vertexName + "-" + instanceName;
// Serialize and write the vertex parameters to a blob
CloudBlobContainer container = _blobClient.GetContainerReference("cra");
container.CreateIfNotExistsAsync().Wait();
var blockBlob = container.GetBlockBlobReference(vertexDefinition + "/" + blobName);
CloudBlobStream blobStream = blockBlob.OpenWriteAsync().GetAwaiter().GetResult();
byte[] parameterBytes = Encoding.UTF8.GetBytes(
SerializationHelper.SerializeObject(vertexParameter));
blobStream.WriteByteArray(parameterBytes);
blobStream.Close();
// Add metadata
var newRow = new VertexTable(instanceName, vertexName, vertexDefinition, "", 0,
procDefRow.VertexCreateAction,
blobName,
false, sharded);
TableOperation insertOperation = TableOperation.InsertOrReplace(newRow);
_vertexTable.ExecuteAsync(insertOperation).Wait();
CRAErrorCode result = CRAErrorCode.Success;
// Send request to CRA instance
VertexTable instanceRow;
try
{
instanceRow = VertexTable.GetRowForInstance(_vertexTable, instanceName);
// Get a stream connection from the pool if available
Stream stream;
if (!TryGetSenderStreamFromPool(instanceRow.Address, instanceRow.Port.ToString(), out stream))
{
TcpClient client = new TcpClient(instanceRow.Address, instanceRow.Port);
client.NoDelay = true;
stream = client.GetStream();
if (SecureStreamConnectionDescriptor != null)
{
stream = SecureStreamConnectionDescriptor.CreateSecureClient(stream, instanceName);
}
}
stream.WriteInt32((int)CRATaskMessageType.LOAD_VERTEX);
stream.WriteByteArray(Encoding.UTF8.GetBytes(vertexName));
stream.WriteByteArray(Encoding.UTF8.GetBytes(vertexDefinition));
stream.WriteByteArray(Encoding.UTF8.GetBytes(newRow.VertexParameter));
result = (CRAErrorCode)stream.ReadInt32();
if (result != 0)
{
Console.WriteLine("Vertex was logically loaded. However, we received an error code from the hosting CRA instance: " + result);
}
// Add/Return stream connection to the pool
TryAddSenderStreamToPool(instanceRow.Address, instanceRow.Port.ToString(), stream);
}
catch
{
Console.WriteLine("The CRA instance appears to be down. Restart it and this vertex will be instantiated automatically");
}
return(result);
}