public static Func <string, bool> Exporter(int maxExport, Guid qid, PatientCohort cohort)
{
// small cohort, export them all
var csize = cohort.PatientIds.Count;
if (csize <= maxExport)
{
return((string _) => true);
}
// need a subset
var tmp = new HashSet <string>(cohort.PatientIds);
var set = new HashSet <string>();
var rnd = new Random(qid.GetHashCode());
foreach (var _ in Enumerable.Range(0, maxExport))
{
var done = false;
string candidate;
do
{
candidate = tmp.ElementAt(rnd.Next(csize - 1));
if (set.Add(candidate))
{
tmp.Remove(candidate);
csize--;
done = true;
}
} while (!done);
}
return((string patid) => set.Contains(patid));
}
/// <summary>
/// Provide an zero count of patients in the specified query.
/// Converts the query into a local validation context.
/// Validates the resulting context to ensure sensible construction.
/// Creates a queryId and empty cohort.
/// </summary>
/// <returns><see cref="Result">The count of patients in the cohort.</see></returns>
/// <param name="queryDTO">Abstract query representation.</param>
/// <param name="token">Cancellation token.</param>
/// <exception cref="OperationCanceledException"/>
/// <exception cref="LeafCompilerException"/>
/// <exception cref="ArgumentNullException"/>
/// <exception cref="LeafRPCException"/>
/// <exception cref="System.Data.Common.DbException"/>
async Task <Result> GatewayCount(IPatientCountQueryDTO queryDTO, CancellationToken token)
{
log.LogInformation("GatewayCount starting. DTO:{@DTO}", queryDTO);
Ensure.NotNull(queryDTO, nameof(queryDTO));
var ctx = await converter.GetPanelsAsync(queryDTO, token);
log.LogInformation("GatewayCount panel validation context. Context:{@Context}", ctx);
if (!ctx.PreflightPassed)
{
return(new Result
{
ValidationContext = ctx
});
}
validator.Validate(ctx);
token.ThrowIfCancellationRequested();
var cohort = new PatientCohort();
var qid = await CacheCohort(cohort);
return(new Result
{
ValidationContext = ctx,
Count = new PatientCount
{
QueryId = qid,
Value = cohort.Count,
SqlStatements = cohort.SqlStatements
}
});
}
async Task <Guid> CacheCohort(PatientCohort cohort)
{
try
{
log.LogInformation("Cohort caching started.");
var qid = await cohortCache.CreateUnsavedQueryAsync(cohort, user);
log.LogInformation("Cohort caching complete. QueryId:{@QueryId}, Panels:{@Panels}", qid, cohort.Panels.ToArray());
return(qid);
}
catch (InvalidOperationException ie)
{
log.LogError("Failed to cache cohort. Error:{Error}", ie.Message);
throw new LeafRPCException(LeafErrorCode.Internal, ie.Message, ie);
}
}