public virtual async Task <FindResults <TResult> > FindAsAsync <TResult>(IRepositoryQuery query, ICommandOptions options = null) where TResult : class, new()
{
if (query == null)
{
query = new RepositoryQuery();
}
bool useSnapshotPaging = options.ShouldUseSnapshotPaging();
// don't use caching with snapshot paging.
bool allowCaching = IsCacheEnabled && useSnapshotPaging == false;
options = ConfigureOptions(options);
await OnBeforeQueryAsync(query, options, typeof(TResult)).AnyContext();
async Task <FindResults <TResult> > GetNextPageFunc(FindResults <TResult> r)
{
var previousResults = r;
if (previousResults == null)
{
throw new ArgumentException(nameof(r));
}
string scrollId = previousResults.GetScrollId();
if (!String.IsNullOrEmpty(scrollId))
{
var scrollResponse = await _client.ScrollAsync <TResult>(options.GetSnapshotLifetime(), scrollId).AnyContext();
if (_logger.IsEnabled(Microsoft.Extensions.Logging.LogLevel.Trace))
{
_logger.LogTrace(scrollResponse.GetRequest());
}
var results = scrollResponse.ToFindResults();
results.Page = previousResults.Page + 1;
results.HasMore = scrollResponse.Hits.Count >= options.GetLimit();
return(results);
}
if (options.ShouldUseSearchAfterPaging())
{
var lastDocument = previousResults.Documents.LastOrDefault();
if (lastDocument != null)
{
var searchAfterValues = new List <object>();
var sorts = query.GetSorts();
if (sorts.Count > 0)
{
foreach (var sort in query.GetSorts())
{
if (sort.SortKey.Property?.DeclaringType == lastDocument.GetType())
{
searchAfterValues.Add(sort.SortKey.Property.GetValue(lastDocument));
}
else if (typeof(TResult) == typeof(T) && sort.SortKey.Expression is Expression <Func <T, object> > valueGetterExpression)
{
var valueGetter = valueGetterExpression.Compile();
var typedLastDocument = lastDocument as T;
if (typedLastDocument != null)
{
var value = valueGetter.Invoke(typedLastDocument);
searchAfterValues.Add(value);
}
}
else if (sort.SortKey.Name != null)
{
var propertyInfo = lastDocument.GetType().GetProperty(sort.SortKey.Name);
if (propertyInfo != null)
{
searchAfterValues.Add(propertyInfo.GetValue(lastDocument));
}
}
else
{
// TODO: going to to need to take the Expression and pull the string name from it
}
}
}
else if (lastDocument is IIdentity lastDocumentId)
{
searchAfterValues.Add(lastDocumentId.Id);
}
if (searchAfterValues.Count > 0)
{
options.SearchAfter(searchAfterValues.ToArray());
}
else
{
throw new ArgumentException("Unable to automatically calculate values for SearchAfterPaging.");
}
}
}
if (options == null)
{
return(new FindResults <TResult>());
}
options?.PageNumber(!options.HasPageNumber() ? 2 : options.GetPage() + 1);
return(await FindAsAsync <TResult>(query, options).AnyContext());
}
string cacheSuffix = options?.HasPageLimit() == true?String.Concat(options.GetPage().ToString(), ":", options.GetLimit().ToString()) : null;
FindResults <TResult> result;
if (allowCaching)
{
result = await GetCachedQueryResultAsync <FindResults <TResult> >(options, cacheSuffix : cacheSuffix).AnyContext();
if (result != null)
{
((IGetNextPage <TResult>)result).GetNextPageFunc = async r => await GetNextPageFunc(r).AnyContext();
return(result);
}
}
ISearchResponse <TResult> response;
if (useSnapshotPaging == false || !options.HasSnapshotScrollId())
{
var searchDescriptor = await CreateSearchDescriptorAsync(query, options).AnyContext();
if (useSnapshotPaging)
{
searchDescriptor.Scroll(options.GetSnapshotLifetime());
}
response = await _client.SearchAsync <TResult>(searchDescriptor).AnyContext();
}
else
{
response = await _client.ScrollAsync <TResult>(options.GetSnapshotLifetime(), options.GetSnapshotScrollId()).AnyContext();
}
if (_logger.IsEnabled(Microsoft.Extensions.Logging.LogLevel.Trace))
{
_logger.LogTrace(response.GetRequest());
}
if (!response.IsValid)
{
if (response.ApiCall.HttpStatusCode.GetValueOrDefault() == 404)
{
return(new FindResults <TResult>());
}
string message = response.GetErrorMessage();
_logger.LogError(response.OriginalException, message);
throw new ApplicationException(message, response.OriginalException);
}
if (useSnapshotPaging)
{
result = response.ToFindResults();
result.HasMore = response.Hits.Count >= options.GetLimit();
((IGetNextPage <TResult>)result).GetNextPageFunc = GetNextPageFunc;
}
else if (options.HasPageLimit())
{
int limit = options.GetLimit();
result = response.ToFindResults(limit);
result.HasMore = response.Hits.Count > limit;
((IGetNextPage <TResult>)result).GetNextPageFunc = GetNextPageFunc;
}
else
{
result = response.ToFindResults();
}
result.Page = options.GetPage();
if (!allowCaching)
{
return(result);
}
var nextPageFunc = ((IGetNextPage <TResult>)result).GetNextPageFunc;
((IGetNextPage <TResult>)result).GetNextPageFunc = null;
await SetCachedQueryResultAsync(options, result, cacheSuffix : cacheSuffix).AnyContext();
((IGetNextPage <TResult>)result).GetNextPageFunc = nextPageFunc;
return(result);
}