private static IAsyncEnumerable <TResult> GetFromCache <TResult>(OeQueryContext queryContext, T dbContext, Cache.OeQueryCache queryCache,
out MethodCallExpression countExpression)
{
countExpression = null;
Cache.OeCacheContext cacheContext = queryContext.CreateCacheContext();
Cache.OeQueryCacheItem queryCacheItem = queryCache.GetQuery(cacheContext);
Func <QueryContext, IAsyncEnumerable <TResult> > queryExecutor;
IReadOnlyList <Cache.OeQueryCacheDbParameterValue> parameterValues;
IQueryable query = queryContext.EntitySetAdapter.GetEntitySet(dbContext);
if (queryCacheItem == null)
{
var parameterVisitor = new OeConstantToParameterVisitor();
Expression expression = queryContext.CreateExpression(parameterVisitor);
expression = queryContext.TranslateSource(dbContext, expression);
queryExecutor = dbContext.CreateAsyncQueryExecutor <TResult>(expression);
countExpression = OeQueryContext.CreateCountExpression(expression);
queryCache.AddQuery(queryContext.CreateCacheContext(parameterVisitor.ConstantToParameterMapper), queryExecutor, countExpression,
queryContext.EntryFactory, queryContext.SkipTokenAccessors);
parameterValues = parameterVisitor.ParameterValues;
}
else
{
queryExecutor = (Func <QueryContext, IAsyncEnumerable <TResult> >)queryCacheItem.Query;
queryContext.EntryFactory = queryCacheItem.EntryFactory;
queryContext.SkipTokenAccessors = queryCacheItem.SkipTokenAccessors;
countExpression = queryCacheItem.CountExpression;
parameterValues = cacheContext.ParameterValues;
}
var queryContextFactory = dbContext.GetService <IQueryContextFactory>();
QueryContext efQueryContext = queryContextFactory.Create();
foreach (Cache.OeQueryCacheDbParameterValue parameterValue in parameterValues)
{
efQueryContext.AddParameter(parameterValue.ParameterName, parameterValue.ParameterValue);
}
if (queryContext.ODataUri.QueryCount.GetValueOrDefault())
{
countExpression = (MethodCallExpression)queryContext.TranslateSource(dbContext, countExpression);
countExpression = (MethodCallExpression) new OeParameterToVariableVisitor().Translate(countExpression, parameterValues);
}
else
{
countExpression = null;
}
return(queryExecutor(efQueryContext));
}
private static Expression GetFromCache(OeQueryContext queryContext, T dbContext, Cache.OeQueryCache queryCache,
out MethodCallExpression countExpression)
{
Cache.OeCacheContext cacheContext = queryContext.CreateCacheContext();
Cache.OeQueryCacheItem queryCacheItem = queryCache.GetQuery(cacheContext);
Expression expression;
IReadOnlyList <Cache.OeQueryCacheDbParameterValue> parameterValues;
if (queryCacheItem == null)
{
var parameterVisitor = new OeConstantToParameterVisitor();
expression = queryContext.CreateExpression(parameterVisitor);
expression = new OeEf6EnumerableToQuerableVisitor().Visit(expression);
cacheContext = queryContext.CreateCacheContext(parameterVisitor.ConstantToParameterMapper);
if (queryContext.EntryFactory == null)
{
countExpression = null;
}
else
{
countExpression = queryContext.CreateCountExpression(expression);
}
queryCache.AddQuery(cacheContext, expression, countExpression, queryContext.EntryFactory);
parameterValues = parameterVisitor.ParameterValues;
}
else
{
expression = (Expression)queryCacheItem.Query;
queryContext.EntryFactory = queryCacheItem.EntryFactory;
countExpression = queryCacheItem.CountExpression;
parameterValues = cacheContext.ParameterValues;
}
expression = new OeParameterToVariableVisitor().Translate(expression, parameterValues);
expression = queryContext.TranslateSource(dbContext, expression);
if (queryContext.IsQueryCount() && countExpression != null)
{
countExpression = (MethodCallExpression)queryContext.TranslateSource(dbContext, countExpression);
countExpression = (MethodCallExpression) new OeParameterToVariableVisitor().Translate(countExpression, parameterValues);
}
else
{
countExpression = null;
}
return(expression);
}
private static Expression GetFromCache(OeQueryContext queryContext, T dbContext, Cache.OeQueryCache queryCache,
out MethodCallExpression countExpression)
{
Cache.OeCacheContext cacheContext = queryContext.CreateCacheContext();
Cache.OeQueryCacheItem queryCacheItem = queryCache.GetQuery(cacheContext);
Expression expression;
IReadOnlyList <Cache.OeQueryCacheDbParameterValue> parameterValues;
IQueryable query = queryContext.EntitySetAdapter.GetEntitySet(dbContext);
if (queryCacheItem == null)
{
var parameterVisitor = new OeConstantToParameterVisitor();
expression = queryContext.CreateExpression(parameterVisitor);
expression = new EnumerableToQuerableVisitor().Visit(expression);
countExpression = OeQueryContext.CreateCountExpression(expression);
queryCache.AddQuery(queryContext.CreateCacheContext(parameterVisitor.ConstantToParameterMapper), expression, countExpression,
queryContext.EntryFactory, queryContext.SkipTokenAccessors);
parameterValues = parameterVisitor.ParameterValues;
}
else
{
expression = (Expression)queryCacheItem.Query;
queryContext.EntryFactory = queryCacheItem.EntryFactory;
queryContext.SkipTokenAccessors = queryCacheItem.SkipTokenAccessors;
countExpression = queryCacheItem.CountExpression;
parameterValues = cacheContext.ParameterValues;
}
expression = new OeParameterToVariableVisitor().Translate(expression, parameterValues);
expression = queryContext.TranslateSource(dbContext, expression);
if (queryContext.ODataUri.QueryCount.GetValueOrDefault())
{
countExpression = (MethodCallExpression)queryContext.TranslateSource(dbContext, countExpression);
countExpression = (MethodCallExpression) new OeParameterToVariableVisitor().Translate(countExpression, parameterValues);
}
else
{
countExpression = null;
}
return(expression);
}
