private static IEnumerable <TResult> GetFromCache <TResult>(OeParseUriContext parseUriContext, T dbContext, Db.OeQueryCache queryCache)
{
Db.QueryCacheItem queryCacheItem = queryCache.GetQuery(parseUriContext);
Func <QueryContext, IEnumerable <TResult> > queryExecutor;
if (queryCacheItem == null)
{
IQueryable query = parseUriContext.EntitySetAdapter.GetEntitySet(dbContext);
var parameterVisitor = new OeConstantToParameterVisitor();
Expression expression = parseUriContext.CreateExpression(query, parameterVisitor);
queryExecutor = dbContext.CreateQueryExecutor <TResult>(expression);
queryCache.AddQuery(parseUriContext, queryExecutor, parameterVisitor.ConstantToParameterMapper);
parseUriContext.ParameterValues = parameterVisitor.ParameterValues;
}
else
{
queryExecutor = (Func <QueryContext, IEnumerable <TResult> >)queryCacheItem.Query;
parseUriContext.EntryFactory = queryCacheItem.EntryFactory;
}
var queryContextFactory = dbContext.GetService <IQueryContextFactory>();
var queryContext = queryContextFactory.Create();
foreach (Db.OeQueryCacheDbParameterValue parameterValue in parseUriContext.ParameterValues)
{
queryContext.AddParameter(parameterValue.ParameterName, parameterValue.ParameterValue);
}
return(queryExecutor(queryContext));
}
private static IAsyncEnumerable <TResult> GetFromCache <TResult>(OeQueryContext queryContext, T dbContext, Db.OeQueryCache queryCache)
{
OeCacheContext cacheContext = queryContext.CreateCacheContext();
Db.QueryCacheItem queryCacheItem = queryCache.GetQuery(cacheContext);
Func <QueryContext, IAsyncEnumerable <TResult> > queryExecutor;
Expression countExpression;
IReadOnlyList <Db.OeQueryCacheDbParameterValue> parameterValues;
if (queryCacheItem == null)
{
IQueryable query = queryContext.EntitySetAdapter.GetEntitySet(dbContext);
var parameterVisitor = new OeConstantToParameterVisitor(false);
Expression expression = queryContext.CreateExpression(query, parameterVisitor);
queryExecutor = dbContext.CreateAsyncQueryExecutor <TResult>(expression);
countExpression = queryContext.CreateCountExpression(query, expression);
queryCache.AddQuery(queryContext.CreateCacheContext(parameterVisitor.ConstantToParameterMapper), queryExecutor, countExpression,
queryContext.EntryFactory, queryContext.SkipTokenParser?.Accessors);
parameterValues = parameterVisitor.ParameterValues;
}
else
{
queryExecutor = (Func <QueryContext, IAsyncEnumerable <TResult> >)queryCacheItem.Query;
queryContext.EntryFactory = queryCacheItem.EntryFactory;
if (queryContext.SkipTokenParser != null)
{
queryContext.SkipTokenParser.Accessors = queryCacheItem.SkipTokenAccessors;
}
countExpression = queryCacheItem.CountExpression;
parameterValues = cacheContext.ParameterValues;
}
var queryContextFactory = dbContext.GetService <IQueryContextFactory>();
QueryContext efQueryContext = queryContextFactory.Create();
foreach (Db.OeQueryCacheDbParameterValue parameterValue in parameterValues)
{
efQueryContext.AddParameter(parameterValue.ParameterName, parameterValue.ParameterValue);
}
if (queryContext.ODataUri.QueryCount.GetValueOrDefault())
{
queryContext.CountExpression = new OeParameterToVariableVisitor().Translate(countExpression, parameterValues);
}
return(queryExecutor(efQueryContext));
}
