_TestCallbackHandler Class — langchain Architecture

Architecture documentation for the _TestCallbackHandler class in chat_models.py from the langchain codebase.

Class python

Entity Profile

Dependency Diagram

graph TD
  212e5aee_8449_326c_9647_f58e4e338d9a["_TestCallbackHandler"]
  af283d05_75a6_5813_267b_f03a32501460["BaseCallbackHandler"]
  212e5aee_8449_326c_9647_f58e4e338d9a -->|extends| af283d05_75a6_5813_267b_f03a32501460
  c97ed773_97f8_2190_c0e8_546293fe345b["chat_models.py"]
  212e5aee_8449_326c_9647_f58e4e338d9a -->|defined in| c97ed773_97f8_2190_c0e8_546293fe345b
  0c051d26_948d_9a69_76a8_6eac2028941c["__init__()"]
  212e5aee_8449_326c_9647_f58e4e338d9a -->|method| 0c051d26_948d_9a69_76a8_6eac2028941c
  d2be06ee_6238_03bd_b802_0d4846c579c2["on_chat_model_start()"]
  212e5aee_8449_326c_9647_f58e4e338d9a -->|method| d2be06ee_6238_03bd_b802_0d4846c579c2

Relationship Graph

Source Code

libs/standard-tests/langchain_tests/integration_tests/chat_models.py lines 77–93

class _TestCallbackHandler(BaseCallbackHandler):
    options: list[dict[str, Any] | None]

    def __init__(self) -> None:
        super().__init__()
        self.options = []

    @override
    def on_chat_model_start(
        self,
        serialized: Any,
        messages: Any,
        *,
        options: dict[str, Any] | None = None,
        **kwargs: Any,
    ) -> None:
        self.options.append(options)