Cole-Greer opened a new pull request, #3433:
URL: https://github.com/apache/tinkerpop/pull/3433
Add CompositePDT (0xF0) support enabling graph providers to define custom
types that serialize/deserialize seamlessly across all GLVs without driver-side
configuration. Replaces the TP3 CustomTypeSerializer mechanism.
Core (gremlin-core):
- Add @ProviderDefined annotation and immutable ProviderDefinedType POJO
- Add ProviderDefinedTypeSerializer for GraphBinary with wire format:
fully-qualified type string + fully-qualified fields map
- Add PdtGraphSONSerializersV4 with g:CompositePdt type tag
- Add ProviderDefinedTypeAdapter<T> and ProviderDefinedTypeRegistry with
ServiceLoader discovery, recursive hydration, and graceful degradation on
adapter failure
- Integrate auto-hydration into GraphBinaryReader and GraphSONMapper
- Add GraphBinaryWriter auto-conversion for @ProviderDefined objects
- Cache reflection metadata per class for performance
- Support inherited fields via superclass walking
- Remove legacy CUSTOM(0x00) type mechanism entirely
Gremlin-lang:
- Add PDT("name", ["key":value]) literal to ANTLR grammar
- Server-side parser constructs ProviderDefinedType from PDT literals
- All GLV translators emit PDT literal syntax
- Registry-based and annotation-based auto-dehydration in translators
- All TranslateVisitors handle PDT for cross-language translation
GLV support (all languages):
- Python: ProviderDefinedType, serializer, registry with @provider_defined
decorator, entry_points auto-discovery, registry wired through
Client/DriverRemoteConnection
- JavaScript: ProviderDefinedType, CompositePDTSerializer, registry with
explicit function pair registration, client options wiring
- Go: ProviderDefinedType struct, serializer/deserializer, PDTRegistry with
struct tags, RegisterFuncs, PDTProvider interface, client wiring
- .NET: ProviderDefinedType, CompositePDTSerializer, registry with
IProviderDefinedTypeAdapter<T>, [ProviderDefined] attribute with
IncludedFields/ExcludedFields, assembly scanning, IMessageSerializer
.SetPdtRegistry() interface method, client/connection wiring
Server and testing:
- PDT flows end-to-end through gremlin-server with TinkerGraph storing
original objects and conversion at serialization boundary
- Test-jar with Point, Address, Person test types for Docker server
- Integration tests in all GLVs using gremlin-lang PDT literals
- Traversal API tests covering raw PDT, registry hydration, and
annotation-based auto-dehydration round-trips
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