/// <summary>
/// Gets or executes teh result context
/// </summary>
public BisResultContext GetOrExecuteQuery(string name)
{
BisResultContext retVal = null;
if (!this.m_dataSources.TryGetValue(name, out retVal))
{
var viewDef = this.m_report.DataSource.FirstOrDefault(o => o.Name == name);
if (viewDef == null)
{
throw new KeyNotFoundException($"Datasource {name} not found");
}
viewDef = BiUtils.ResolveRefs(viewDef);
// Get the datasource for the execution engine
var dsource = (viewDef as BiViewDefinition)?.Query?.DataSources.FirstOrDefault(o => o.Name == "main") ?? (viewDef as BiViewDefinition)?.Query?.DataSources.FirstOrDefault() ??
(viewDef as BiQueryDefinition)?.DataSources.FirstOrDefault(o => o.Name == "main") ?? (viewDef as BiQueryDefinition)?.DataSources.FirstOrDefault();
IBiDataSource providerImplementation = null;
if (dsource.ProviderType != null)
{
providerImplementation = ApplicationServiceContext.Current.GetService <IServiceManager>().CreateInjected(dsource.ProviderType) as IBiDataSource;
}
else
{
providerImplementation = ApplicationServiceContext.Current.GetService <IBiDataSource>(); // Global default
}
// Load from cache instead of DB?
var cacheService = ApplicationServiceContext.Current.GetService <IAdhocCacheService>();
var key = $"{name}?{String.Join("&", this.Parameters.Select(o => $"{o.Key}={o.Value}"))}";
var cacheResult = cacheService?.Get <IEnumerable <dynamic> >(key);
int count = 10000;
if (this.m_maxResultSetSize.HasValue)
{
count = this.m_maxResultSetSize.Value;
}
else if (this.Parameters.TryGetValue("_count", out var parameterCount) && Int32.TryParse(parameterCount.ToString(), out var tCount))
{
count = tCount;
}
if (cacheResult != null)
{
return(new BisResultContext(null, this.Parameters, providerImplementation, cacheResult, DateTime.Now));
}
else if (viewDef is BiViewDefinition)
{
retVal = providerImplementation.ExecuteView(viewDef as BiViewDefinition, this.Parameters, 0, count);
}
else if (viewDef is BiQueryDefinition)
{
retVal = providerImplementation.ExecuteQuery(viewDef as BiQueryDefinition, this.Parameters, null, 0, count);
}
else
{
throw new InvalidOperationException($"Cannot determine data source type of {name}");
}
cacheService?.Add(key, retVal.Dataset, new TimeSpan(0, 1, 0));
this.m_dataSources.Add(name, retVal);
}
return(retVal);
}
/// <summary>
/// Pivot provider
/// </summary>
public BisResultContext Pivot(BisResultContext context, BiViewPivotDefinition pivot)
{
var buckets = new List <ExpandoObject>();
// First we must order by the pivot
context.Dataset.OrderBy(o => (o as IDictionary <String, Object>)[pivot.Key]);
// Algorithm for pivoting :
IDictionary <String, Object> cobject = null;
foreach (IDictionary <String, Object> itm in context.Dataset)
{
var key = itm[pivot.Key];
if (cobject == null || !key.Equals(cobject[pivot.Key]) && cobject.Count > 0)
{
cobject = new ExpandoObject();
cobject.Add(pivot.Key, key);
buckets.Add(cobject as ExpandoObject);
}
// Same key, so lets create or accumulate
var column = itm[pivot.Columns];
if (!cobject.ContainsKey(column.ToString()))
{
cobject.Add(column.ToString(), new List <Object>()
{
itm[pivot.Value]
});
}
else
{
var cvalue = cobject[column.ToString()] as List <Object>;
var avalue = itm[pivot.Value];
cvalue.Add(avalue);
}
}
// Now we have our buckets, we want to apply our aggregation function
var colNames = new List <String>();
var aggBuckets = new List <ExpandoObject>();
foreach (IDictionary <String, Object> itm in buckets.ToArray())
{
var newItm = new ExpandoObject() as IDictionary <String, Object>;
foreach (var value in itm)
{
if (value.Key == pivot.Key)
{
newItm[pivot.Key] = value.Value;
continue; // Don't de-bucket the object
}
var bucket = (value.Value as IEnumerable <Object>);
newItm[value.Key] = this.Aggregate((value.Value as List <Object>), pivot.AggregateFunction);
if (!colNames.Contains(value.Key))
{
colNames.Add(value.Key);
}
}
aggBuckets.Add(newItm as ExpandoObject);
}
// Add where necessary
var output = new List <ExpandoObject>();
foreach (IDictionary <String, Object> itm in aggBuckets)
{
var tuple = (new ExpandoObject() as IDictionary <String, Object>);
tuple[pivot.Key] = itm[pivot.Key];
foreach (var col in colNames)
{
if (itm.ContainsKey(col))
{
tuple[col] = itm[col];
}
else
{
tuple[col] = null;
}
}
output.Add(tuple as ExpandoObject);
}
return(new BisResultContext(context.QueryDefinition, context.Arguments, context.DataSource, output, context.StartTime.DateTime));
}
