/// <summary>
/// Get cache key hashes for both the query and the settings.
/// </summary>
/// <remarks>
/// Note: we need to do both in the same context, so that a single StructuredQueryHashingContext can do all of the GUID normalizations together.
/// </remarks>
/// <returns>A hash string</returns>
private static string GetCacheKeyTokens(StructuredQuery query, QuerySqlBuilderSettings settings)
{
if (query == null)
{
throw new ArgumentNullException("query");
}
using (new StructuredQueryHashingContext( ))
{
string queryHash = query.CacheKeyToken();
byte[] clientAggregateBytes = null;
if (settings.ClientAggregate != null)
{
clientAggregateBytes = settings.ClientAggregate.Serialize( );
}
byte[] sharedParameterBytes = null;
if (settings.SharedParameters != null)
{
using (var memoryStream = new MemoryStream( ))
{
// Serialize the query
Serializer.Serialize(memoryStream, settings.SharedParameters);
memoryStream.Flush( );
sharedParameterBytes = memoryStream.ToArray( );
}
}
byte[] hashValue = HashValues(clientAggregateBytes, sharedParameterBytes);
string settingsHash = string.Empty;
if (hashValue != null)
{
settingsHash = Convert.ToBase64String(hashValue);
}
string key = string.Concat(queryHash, " / ", settingsHash);
return(key);
}
}
public void Test_GetCacheKeyToken_Stability( )
{
StructuredQuery sq1 = ReportHelpers.BuildFilterQuery("Name='test1'", new ReadiNow.Model.EntityRef("test:person"), true);
sq1.SelectColumns.Add(new SelectColumn {
Expression = new ResourceExpression(sq1.RootEntity, "core:name")
});
StructuredQuery sq2 = ReportHelpers.BuildFilterQuery("Name='test1'", new ReadiNow.Model.EntityRef("test:person"), true);
sq2.SelectColumns.Add(new SelectColumn {
Expression = new ResourceExpression(sq2.RootEntity, "core:name")
});
string token1 = sq1.CacheKeyToken( );
string token2 = sq2.CacheKeyToken( );
Assert.That(token1, Is.EqualTo(token2).And.Not.Null);
}
public void Test_GetCacheKeyToken_Concurrent( )
{
StructuredQuery sq1 = ReportHelpers.BuildFilterQuery("Name='test1'", new ReadiNow.Model.EntityRef("test:person"), true);
sq1.SelectColumns.Add(new SelectColumn {
Expression = new ResourceExpression(sq1.RootEntity, "core:name")
});
StructuredQuery sq2 = ReportHelpers.BuildFilterQuery("Name='test1'", new ReadiNow.Model.EntityRef("test:person"), true);
sq2.SelectColumns.Add(new SelectColumn {
Expression = new ResourceExpression(sq2.RootEntity, "core:name")
});
string token1 = null;
string token2 = null;
Task.WaitAll(
Task.Factory.StartNew(() => { token1 = sq1.CacheKeyToken( ); }),
Task.Factory.StartNew(() => { token2 = sq2.CacheKeyToken( ); })
);
Assert.That(token1, Is.EqualTo(token2).And.Not.Null);
}