public DataEngine(ITracer tracer, string instanceName, int maxConcurrency, IStorageDriver storageDriver, DataContainerDescriptor containerDescriptor)
{
if (tracer == null)
{
throw new ArgumentNullException("tracer");
}
if (maxConcurrency <= 0 || maxConcurrency > 10000)
{
throw new ArgumentOutOfRangeException("maxConcurrency");
}
if (storageDriver == null)
{
throw new ArgumentNullException("storageDriver");
}
if (containerDescriptor == null)
{
throw new ArgumentNullException("containerDescriptor");
}
m_tracer = tracer;
m_containerDescriptor = containerDescriptor;
m_maxConcurrency = maxConcurrency;
m_parsedRequestCache = new ParsedRequestCache(instanceName);
m_storageDriver = storageDriver;
m_parser = new QueryParser(containerDescriptor, maxConcurrency);
m_activeProcessors = new ConcurrentDictionary <RequestExecutionContext, Task>(m_maxConcurrency, m_maxConcurrency);
m_utcLastUsedAt = DateTime.UtcNow;
}
private void ReadRequest(RequestExecutionContext context)
{
Serializer.MergeWithLengthPrefix(context.RequestMessage.Stream, context.Request, PrefixStyle.Base128);
if (context.Request.PrepareOnly)
{
// prevent any ambiguities
context.Request.ReturnDataset = false;
}
if (context.Request.HaveParameters)
{
context.ParsedRequest.HaveParametersDataInput = true;
Serializer.MergeWithLengthPrefix(context.RequestMessage.Stream, context.RequestParameters, PrefixStyle.Base128);
ReadParametersDataInput(context);
}
if (context.Request.HaveRequestBulk)
{
context.ParsedRequest.IsBulk = true;
Serializer.MergeWithLengthPrefix(context.RequestMessage.Stream, context.RequestBulk, PrefixStyle.Base128);
// after this point in stream, bulk input data will be read by instance of InputDataStreamEnumerator
// e.g. we're not yet done reading the request stream here
}
if (m_tracer.IsInfoEnabled)
{
var cmdText = context.Request.CommandText;
if (string.IsNullOrEmpty(cmdText) && context.Request.HaveRequestBulk)
{
cmdText = string.Format("Bulk {0} with {2} items on {1}", context.RequestBulk.DbStatementType, context.RequestBulk.EntityName, context.RequestBulk.InputItemsCount);
}
m_tracer.Info("Received command: " + cmdText);
}
// bring up cache record
var cacheKey = ParsedRequestCache.GetRequestHash(context.Request, context.RequestBulk, context.RequestParameters);
var cacheInfo = m_parsedRequestCache.AddOrGetExisting(cacheKey, context.Request.HaveParameters);
context.AttachCachedInfo(cacheInfo);
// populate cache record
if (!cacheInfo.HaveRequestHeaders)
{
lock (cacheInfo)
{
cacheInfo.CheckIsError();
if (!cacheInfo.HaveRequestHeaders)
{
cacheInfo.ReadRequestHeaders(context.Request, context.RequestParameters, context.RequestBulk, context.ParsedRequest);
}
}
}
}
