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LargeJsonObjectExtensionDataSerializationState
Implements a mitigation for deserializing large JsonObject extension data properties.
Extension data properties use replace semantics when duplicate keys are encountered,
which is an O(n) operation for JsonObject resulting in O(n^2) total deserialization time.
This class mitigates the performance issue by storing the deserialized properties in a
temporary dictionary (which has O(1) updates) and copies them to the destination object
at the end of deserialization.
using System .
Collections .
Generic ;
using System .
Text .
Json .
Nodes ;
namespace System .
Text .
Json .
Serialization .
Converters
{
internal sealed class LargeJsonObjectExtensionDataSerializationState
{
public const int LargeObjectThreshold =
25 ;
private readonly Dictionary <
string ,
JsonNode >
_tempDictionary ;
public JsonObject Destination { get; }
public LargeJsonObjectExtensionDataSerializationState (
JsonObject destination )
{
StringComparer comparer = (
destination .
Options ?.
PropertyNameCaseInsensitive ??
false ) ?
StringComparer .
OrdinalIgnoreCase :
StringComparer .
Ordinal ;
Destination =
destination ;
_tempDictionary =
new Dictionary <
string ,
JsonNode >(
comparer );
}
public void AddProperty (
string key ,
JsonNode value )
{
_tempDictionary [
key ] =
value ;
}
public void Complete ()
{
foreach (
KeyValuePair <
string ,
JsonNode >
item in _tempDictionary ) {
Destination [
item .
Key ] =
item .
Value ;
}
}
}
}