/// <summary>
/// Refer to CachingQuerySqlBuilder.MutateResultToMatchCurrentQuery
/// </summary>
internal static QueryResult MutateResultToMatchCurrentQuery(CachingQueryRunnerValue cacheValue, StructuredQuery currentQuery)
{
if (cacheValue == null)
{
throw new ArgumentNullException("cacheValue");
}
if (currentQuery == null)
{
throw new ArgumentNullException("currentQuery");
}
// Clone result
QueryBuild queryBuild = CachingQuerySqlBuilder.MutateResultToMatchCurrentQuery(cacheValue.QueryResult.QueryBuild, cacheValue.OriginalQuery, currentQuery);
QueryResult result = cacheValue.QueryResult.ShallowClone(queryBuild);
return(result);
}
/// <summary>
/// Try to get the value from cache, with logging.
/// </summary>
private bool TryGetOrAdd(CachingQueryRunnerKey key, MessageContext msg, out CachingQueryRunnerValue result, Func <CachingQueryRunnerKey, CachingQueryRunnerValue> valueFactory)
{
bool foundValue;
foundValue = Cache.TryGetOrAdd(key, out result, valueFactory);
msg.Append(() => "CachingQueryRunner key:" + key);
if (foundValue)
{
var cacheValue = result;
msg.Append(() => "CachingQueryRunner cache hit");
msg.Append(() => $"Entry originally cached at {cacheValue.CacheTime}");
}
else
{
msg.Append(() => "CachingQueryRunner cache miss");
}
return(foundValue);
}
/// <summary>
/// Build the SQL, or collect it from cache.
/// </summary>
/// <param name="query"></param>
/// <param name="settings"></param>
/// <returns></returns>
public QueryResult ExecuteQuery(StructuredQuery query, QuerySettings settings)
{
// Validate
if (query == null)
{
throw new ArgumentNullException("query");
}
if (QueryRunner == null)
{
throw new InvalidOperationException("QueryRunner not set.");
}
if (settings == null)
{
settings = new QuerySettings( );
}
// Determine if we should cache .. and the cache key
QueryBuild builtQuery;
CachingQueryRunnerKey key;
CacheContext queryBuilderCacheContext;
using (queryBuilderCacheContext = new CacheContext())
{
key = CreateCacheKeyAndQuery(query, settings, out builtQuery);
}
// A null key means that the ersult should not participate in caching
if (key == null)
{
return(RunQueryImpl(query, settings, builtQuery));
}
CachingQueryRunnerValue cacheValue;
using (MessageContext msg = new MessageContext("Reports"))
{
// Check for force recalculation
if (settings.RefreshCachedResult)
{
msg.Append(() => "CachingQueryRunner refreshed forced");
Cache.Remove(key);
}
// Run query
bool fromCache = TryGetOrAdd(key, msg, out cacheValue, callbackKey =>
{
using (CacheContext cacheContext = new CacheContext( ))
{
QueryResult queryResult = RunQueryImpl(query, settings, builtQuery);
cacheValue = new CachingQueryRunnerValue(query, queryResult);
// Add the cache context entries to the appropriate CacheInvalidator
_cacheInvalidator.AddInvalidations(cacheContext, callbackKey);
_cacheInvalidator.AddInvalidations(queryBuilderCacheContext, callbackKey);
}
return(cacheValue);
});
if (fromCache && CacheContext.IsSet())
{
using (CacheContext cacheContext = CacheContext.GetContext( ))
{
// Add the already stored changes that should invalidate this cache
// entry to any outer or containing cache contexts.
cacheContext.AddInvalidationsFor(_cacheInvalidator, key);
}
}
}
if (cacheValue == null)
{
throw new Exception("Assert false");
}
// Mutate returned result to be suitable for current query
QueryResult result;
if (cacheValue.OriginalQuery == query)
{
result = cacheValue.QueryResult;
}
else
{
result = MutateResultToMatchCurrentQuery(cacheValue, query);
}
return(result);
}
