private void ParseRequest(DataRequest request, DataRequestBulk requestBulk, ParsedRequest parsedRequest, CancellationToken cancellation)
{
if (parsedRequest.SpecialCommand.IsSpecialCommand)
{
if (parsedRequest.SpecialCommand.CommandType != ParsedRequest.SpecialCommandData.SpecialCommandType.Defragment)
{
throw new CompilationException(
"Invalid special command type: " + parsedRequest.SpecialCommand.CommandType + ". Command text was: " + request.CommandText);
}
return;
}
// by now, we have all information about the request at hand, including parameter values data.
// parser will write results into cacheInfo object
m_parser.Parse(request, requestBulk, parsedRequest, cancellation);
if (parsedRequest.StatementType == StatementType.Delete || parsedRequest.StatementType == StatementType.Insert)
{
// for insert and delete, we need all columns' data ready for modification before we start
m_storageDriver.PrepareAllColumnsAndWait(parsedRequest.TargetEntity.DocumentType);
}
else
{
// for other statement types, we only need fields that we order by, filter on, fetch or update,
// and we need them in that particular order.
// schedule loading of sort order fields
foreach (var field in parsedRequest.BaseDataset.OrderClauseFields)
{
m_storageDriver.BeginPrepareColumnData(field.Item1);
}
// schedule loading of where clause fields
foreach (var field in parsedRequest.BaseDataset.WhereClauseFields)
{
m_storageDriver.BeginPrepareColumnData(field.FieldId);
}
// schedule loading of fetched fields
foreach (var field in parsedRequest.Select.SelectFields)
{
m_storageDriver.BeginPrepareColumnData(field.FieldId);
}
// schedule loading of inserted/updated fields
foreach (var field in parsedRequest.Modify.ModifiedFields)
{
m_storageDriver.BeginPrepareColumnData(field.FieldId);
}
}
}
/// <summary>
/// Computes an Int64 hash value for a request for use with dictionary of prepared requests.
/// </summary>
public static long GetRequestHash(DataRequest request, DataRequestBulk requestBulk, DataRequestParams requestParams)
{
if (request == null)
{
throw new ArgumentNullException("request");
}
if (request.HaveRequestBulk && requestBulk == null)
{
throw new ArgumentNullException("requestBulk");
}
if (request.HaveParameters && requestParams == null)
{
throw new ArgumentNullException("requestParams");
}
long hash;
int modulo;
InitHash(out hash, out modulo);
if (request.HaveRequestBulk)
{
AppendToHash(ref hash, modulo, (requestBulk.EntityName ?? string.Empty).GetHashCode());
AppendToHash(ref hash, modulo, (int)requestBulk.DbStatementType);
foreach (var f in requestBulk.FieldNames)
{
AppendToHash(ref hash, modulo, f.GetHashCode());
}
}
else
{
AppendToHash(ref hash, modulo, (request.CommandText ?? string.Empty).GetHashCode());
if (request.HaveParameters)
{
foreach (var dataType in requestParams.DataTypes)
{
AppendToHash(ref hash, modulo, (int)dataType);
}
foreach (var bitVectorData in requestParams.IsCollectionFlags)
{
AppendToHash(ref hash, modulo, bitVectorData);
}
}
}
return hash;
}
/// <summary>
/// Reads portion of request headers appropriate for caching into the cache buffer.
/// </summary>
public void ReadRequestHeaders(DataRequest request, DataRequestParams requestParams, DataRequestBulk requestBulk, ParsedRequest parsedRequest)
{
if (request == null)
{
throw new ArgumentNullException("requestParams");
}
CommandText = request.CommandText;
RequestParams.Clear();
RequestBulk.Clear();
if (request.HaveParameters)
{
RequestParams.DataTypes = requestParams.DataTypes;
RequestParams.IsCollectionFlags = requestParams.IsCollectionFlags;
RequestParams.Names = requestParams.Names;
// some values are written into parsed request during request read process
// have to replicate them in the cached version, because they are required for subsequent compilation
ParsedRequest.Params.Names = parsedRequest.Params.Names;
ParsedRequest.Params.DataTypes = parsedRequest.Params.DataTypes;
ParsedRequest.Params.OrdinalToLocalOrdinal = parsedRequest.Params.OrdinalToLocalOrdinal;
}
if (request.HaveRequestBulk)
{
RequestBulk.DbStatementType = requestBulk.DbStatementType;
RequestBulk.EntityName = requestBulk.EntityName;
RequestBulk.FieldNames = requestBulk.FieldNames;
// some values are written into parsed request during request read process
// have to replicate them in the cached version, because they are required for subsequent compilation
ParsedRequest.IsBulk = parsedRequest.IsBulk;
}
if (StringComparer.OrdinalIgnoreCase.Equals(CommandText, "defragment"))
{
ParsedRequest.SpecialCommand.IsSpecialCommand = true;
ParsedRequest.SpecialCommand.CommandType = ParsedRequest.SpecialCommandData.SpecialCommandType.Defragment;
}
HaveRequestHeaders = true;
}
private PqlMessage SendCommand(IDataService channel, DataRequest dataRequest, DataRequestParams dataRequestParams, DataRequestBulk dataRequestBulk)
{
var authContext = m_connection.ClientSecurityContext;
if (authContext == null)
{
throw new InvalidOperationException("Authentication context is not set on the thread");
}
if (string.IsNullOrWhiteSpace(authContext.TenantId))
{
throw new InvalidOperationException("Current authentication context does not have value for TenantId");
}
Message responseMessage;
using (var holder = PqlDataConnection.CommandStreams.Take(m_connection.CancellationTokenSource.Token))
{
holder.Item.Attach(dataRequest, dataRequestParams, dataRequestBulk);
var requestMessage = new PqlMessage(
holder.Item, new IDisposable[] {holder},
AuthContextSerializer.GetString(authContext),
m_connection.ConnectionProps.ScopeId,
m_connection.ConnectionProps.ProtocolVersion);
responseMessage = channel.Process(requestMessage);
}
var pqlMessage = responseMessage as PqlMessage;
if (pqlMessage != null)
{
return pqlMessage;
}
throw new DataException(string.Format(
"Message must be of type {0}. Actual type that came from WCF transport was {1}",
typeof(PqlMessage).AssemblyQualifiedName,
responseMessage.GetType().AssemblyQualifiedName));
}
private void ParsePqlStatementRequest(DataRequest request, ParsedRequest parsedRequest, CancellationToken cancellation)
{
ParseTree parseTree;
using (var poolAccessor = m_parsers.Take(cancellation))
{
try
{
parseTree = poolAccessor.Item.Parse(request.CommandText);
}
finally
{
// get rid of temp utility objects right now, to help them be reclaimed with Gen0
poolAccessor.Item.Reset();
}
}
if (parseTree.Status != ParseTreeStatus.Parsed)
{
throw new CompilationException(BuildParserErrorMessage(parseTree));
}
// root is a batch of Pql statements
var root = parseTree.Root;
if (root.ChildNodes == null || root.ChildNodes.Count != 1)
{
throw new CompilationException("Pql batch must contain exactly one statement", root);
}
var statementRoot = root.ChildNodes[0];
// run first round of syntactical analysis on the tree
if ("selectStmt".Equals(statementRoot.Term.Name))
{
parsedRequest.StatementType = StatementType.Select;
ParseSelectStatement(parsedRequest, statementRoot);
}
else if ("updateStmt".Equals(statementRoot.Term.Name))
{
parsedRequest.StatementType = StatementType.Update;
ParseUpdateStatement(parsedRequest, statementRoot);
}
else if ("insertStmt".Equals(statementRoot.Term.Name))
{
parsedRequest.StatementType = StatementType.Insert;
ParseInsertStatement(parsedRequest, statementRoot);
}
else if ("deleteStmt".Equals(statementRoot.Term.Name))
{
parsedRequest.StatementType = StatementType.Delete;
ParseDeleteStatement(parsedRequest, statementRoot);
}
else
{
throw new CompilationException("Invalid statement: " + statementRoot.Term.Name, statementRoot);
}
}
/// <summary>
/// Parses specified expression text, with a cancellation option.
/// May incur some waiting in highly concurrent environment, because the number of pooled parsers is limited.
/// </summary>
public void Parse(DataRequest request, DataRequestBulk requestBulk, ParsedRequest parsedRequest, CancellationToken cancellation)
{
if (request == null)
{
throw new ArgumentNullException("request");
}
if (parsedRequest == null)
{
throw new ArgumentNullException("parsedRequest");
}
if (cancellation == null)
{
throw new ArgumentNullException("cancellation");
}
if (request.HaveRequestBulk && requestBulk == null)
{
throw new ArgumentNullException("requestBulk");
}
if (request.HaveRequestBulk)
{
ParseBulkRequest(requestBulk, parsedRequest);
}
else
{
ParsePqlStatementRequest(request, parsedRequest, cancellation);
}
InitDriverFetchFields(parsedRequest);
}
/// <summary>
/// Ctr.
/// </summary>
/// <param name="process">Parent process, receives crash notifications</param>
/// <param name="tracer">Tracer object</param>
public RequestExecutionContext(IPqlEngineHostProcess process, ITracer tracer)
{
if (process == null)
{
throw new ArgumentNullException("process");
}
if (tracer == null)
{
throw new ArgumentNullException("tracer");
}
m_tracer = tracer;
m_process = process;
ParsedRequest = new ParsedRequest(false);
Request = new DataRequest();
RequestBulk = new DataRequestBulk();
RequestParameters = new DataRequestParams();
m_buffersRingItems = new []
{
new RequestExecutionBuffer(),
new RequestExecutionBuffer(),
new RequestExecutionBuffer()
};
}
