public void Evaluate()
{
if (!_evaluatable)
{
throw new InvalidOperationException("Evaluate() can be called only once");
}
// initialize context
_strategy.Initialize(_context, _strategyParameterValues);
// Get all trading objects
_allTradingObjects = _provider.GetAllTradingObjects();
// Get last warm up data periods
_firstNonWarmupDataPeriods = _provider.GetFirstNonWarmupDataPeriods();
// evaluating
var lastPeriodTime = DateTime.MinValue;
Bar[] lastPeriodData = null;
var periods = _provider.GetAllPeriodsOrdered();
bool fullTradingDataReached = false;
for (var periodIndex = 0; periodIndex < periods.Length; ++periodIndex)
{
var thisPeriodTime = periods[periodIndex];
var thisPeriodData = _provider.GetDataOfPeriod(thisPeriodTime);
if (thisPeriodData.Length != _allTradingObjects.Length)
{
throw new InvalidOperationException("the number of data returned does not match the number of trading object");
}
// process pure warm up data.
if (_firstNonWarmupDataPeriods.All(t => t > thisPeriodTime))
{
// update metrics that registered by strategy
_context.MetricManager.BeginUpdateMetrics();
_context.MetricManager.UpdateMetrics(_allTradingObjects, thisPeriodData);
_context.MetricManager.EndUpdateMetrics();
continue;
}
// remove warm up data if necessary
var originalThisPeriodData = thisPeriodData;
if (!fullTradingDataReached)
{
if (_firstNonWarmupDataPeriods.All(t => t <= thisPeriodTime))
{
// from now on, all data are useful trading data
fullTradingDataReached = true;
}
else
{
thisPeriodData = new Bar[originalThisPeriodData.Length];
Array.Copy(originalThisPeriodData, thisPeriodData, thisPeriodData.Length);
for (int i = 0; i < thisPeriodData.Length; ++i)
{
if (thisPeriodData[i].Time < _firstNonWarmupDataPeriods[i])
{
thisPeriodData[i].Time = Bar.InvalidTime;
}
}
}
}
// set current period data in context
_context.SetCurrentPeriodData(thisPeriodData);
// start a new period
_strategy.StartPeriod(thisPeriodTime);
// assign all instructions in next period to current period because new period starts
_currentPeriodInstructions.Clear();
_currentPeriodInstructions.AddRange(_nextPeriodInstructions);
_nextPeriodInstructions.Clear();
// run instructions left over from previous period
RunCurrentPeriodInstructions(lastPeriodData, thisPeriodData, thisPeriodTime);
#if DEBUG
// check data
if (thisPeriodData.Any(bar => bar.Time != Bar.InvalidTime && bar.Time != thisPeriodTime))
{
throw new InvalidOperationException("Time in bar data is different with the time returned by data provider");
}
#endif
// update metrics that registered by strategy.
// here we should always use original data to update metrics.
_context.MetricManager.BeginUpdateMetrics();
_context.MetricManager.UpdateMetrics(_allTradingObjects, originalThisPeriodData);
_context.MetricManager.EndUpdateMetrics();
// update position lasted period count
foreach (var code in _context.GetAllPositionCodes())
{
int tradingObjectIndex = _provider.GetIndexOfTradingObject(code);
if (thisPeriodData[tradingObjectIndex].Time != Bar.InvalidTime)
{
foreach (var position in _context.GetPositionDetails(code))
{
if (position.BuyTime < thisPeriodTime)
{
position.IncreaseLastedPeriodCount();
}
}
}
}
// evaluate bar data
_strategy.Evaluate(_allTradingObjects, thisPeriodData);
// get instructions and add them to pending instruction list
var instructions = _strategy.RetrieveInstructions().ToArray();
if (instructions.Any(i => i.Action == TradingAction.OpenLong))
{
// update active account only if there is open long instruction
_activeAccountId++;
_activeAccountId %= _numberOfAccounts;
// decide if instructions should be excuted in current account
if (_activeAccountId != _accountId)
{
// remove OpenLong instructions
instructions = instructions.Where(i => i.Action != TradingAction.OpenLong).ToArray();
}
}
if (instructions.Any())
{
foreach (var instruction in instructions)
{
UpdateInstructionWithDefaultPriceWhenNecessary(instruction);
if (instruction.Price.Period == TradingPricePeriod.CurrentPeriod)
{
_currentPeriodInstructions.Add(instruction);
}
else if (instruction.Price.Period == TradingPricePeriod.NextPeriod)
{
_nextPeriodInstructions.Add(instruction);
}
else
{
throw new InvalidProgramException("unsupported price period");
}
}
// run instructions for current period
RunCurrentPeriodInstructions(lastPeriodData, thisPeriodData, thisPeriodTime);
}
// end period
_strategy.EndPeriod();
// reset current period data in context
_context.SetCurrentPeriodData(null);
// update last period time and data
lastPeriodTime = thisPeriodTime;
lastPeriodData = thisPeriodData;
// update progress event
if (OnEvaluationProgress != null)
{
OnEvaluationProgress(
this,
new EvaluationProgressEventArgs(
thisPeriodTime,
(double)(periodIndex + 1) / periods.Length));
}
}
// finish evaluation
_strategy.Finish();
// Sell all equities forcibly.
ClearEquityForcibly(lastPeriodTime);
// clear all pending instructions.
_currentPeriodInstructions.Clear();
_nextPeriodInstructions.Clear();
// update 'evaluatable' flag to avoid this function be called twice
_evaluatable = false;
}
public void Predicate()
{
if (!_predicatable)
{
throw new InvalidOperationException("Predicate() can be called only once");
}
// initialize context
_strategy.Initialize(_context, _strategyParameterValues);
// Get all trading objects
_allTradingObjects = _provider.GetAllTradingObjects();
// Get last warm up data periods
_firstNonWarmupDataPeriods = _provider.GetFirstNonWarmupDataPeriods();
// evaluating
var lastPeriodTime = DateTime.MinValue;
Bar[] lastPeriodData = null;
var periods = _provider.GetAllPeriodsOrdered();
bool fullTradingDataReached = false;
for (var periodIndex = 0; periodIndex < periods.Length; ++periodIndex)
{
var thisPeriodTime = periods[periodIndex];
var thisPeriodData = _provider.GetDataOfPeriod(thisPeriodTime);
if (thisPeriodData.Length != _allTradingObjects.Length)
{
throw new InvalidOperationException("the number of data returned does not match the number of trading object");
}
// process pure warm up data.
if (_firstNonWarmupDataPeriods.All(t => t > thisPeriodTime))
{
// update metrics that registered by strategy
_context.MetricManager.BeginUpdateMetrics();
_context.MetricManager.UpdateMetrics(_allTradingObjects, thisPeriodData);
_context.MetricManager.EndUpdateMetrics();
continue;
}
// remove warm up data if necessary
var originalThisPeriodData = thisPeriodData;
if (!fullTradingDataReached)
{
if (_firstNonWarmupDataPeriods.All(t => t <= thisPeriodTime))
{
// from now on, all data are useful trading data
fullTradingDataReached = true;
}
else
{
thisPeriodData = new Bar[originalThisPeriodData.Length];
Array.Copy(originalThisPeriodData, thisPeriodData, thisPeriodData.Length);
for (int i = 0; i < thisPeriodData.Length; ++i)
{
if (thisPeriodData[i].Time < _firstNonWarmupDataPeriods[i])
{
thisPeriodData[i].Time = Bar.InvalidTime;
}
}
}
}
// set current period data in context
_context.SetCurrentPeriodData(thisPeriodData);
// start a new period
_strategy.StartPeriod(thisPeriodTime);
// assign all instructions in next period to current period because new period starts
_currentPeriodInstructions.Clear();
_currentPeriodInstructions.AddRange(_nextPeriodInstructions);
_nextPeriodInstructions.Clear();
// run instructions left over from previous period
RunCurrentPeriodInstructions(lastPeriodData, thisPeriodData, thisPeriodTime);
#if DEBUG
// check data
if (thisPeriodData.Any(bar => bar.Time != Bar.InvalidTime && bar.Time != thisPeriodTime))
{
throw new InvalidOperationException("Time in bar data is different with the time returned by data provider");
}
#endif
// update metrics that registered by strategy.
// here we should always use original data to update metrics.
_context.MetricManager.BeginUpdateMetrics();
_context.MetricManager.UpdateMetrics(_allTradingObjects, originalThisPeriodData);
_context.MetricManager.EndUpdateMetrics();
// add active positions
if (_unprocessedActivePositions.Any())
{
var positions = _unprocessedActivePositions.Where(p => p.BuyTime <= thisPeriodTime);
if (positions.Any())
{
foreach (var position in positions)
{
_equityManager.ManualAddPosition(position);
}
_unprocessedActivePositions = _unprocessedActivePositions.Where(p => p.BuyTime > thisPeriodTime).ToList();
}
}
// evaluate bar data
_strategy.Evaluate(_allTradingObjects, thisPeriodData);
// get instructions and add them to pending instruction list
var instructions = _strategy.RetrieveInstructions().ToArray();
if (instructions.Any())
{
if (thisPeriodTime == periods[periods.Length - 1])
{
_predicatedTransactions = instructions
.Select(ins => BuildTransactionFromInstruction(ins, thisPeriodTime, thisPeriodData[ins.TradingObject.Index]))
.ToList();
}
else
{
foreach (var instruction in instructions)
{
UpdateInstructionWithDefaultPriceWhenNecessary(instruction);
if (instruction.Price.Period == TradingPricePeriod.CurrentPeriod)
{
_currentPeriodInstructions.Add(instruction);
}
else if (instruction.Price.Period == TradingPricePeriod.NextPeriod)
{
_nextPeriodInstructions.Add(instruction);
}
else
{
throw new InvalidProgramException("unsupported price period");
}
}
// run instructions for current period
RunCurrentPeriodInstructions(lastPeriodData, thisPeriodData, thisPeriodTime);
}
}
// end period
_strategy.EndPeriod();
// reset current period data in context
_context.SetCurrentPeriodData(null);
// update last period time and data
lastPeriodTime = thisPeriodTime;
lastPeriodData = thisPeriodData;
}
// finish evaluation
_strategy.Finish();
// clear all pending instructions.
_currentPeriodInstructions.Clear();
_nextPeriodInstructions.Clear();
// update flag to avoid this function be called twice
_predicatable = false;
}
