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BaseCallbackHandler Class — langchain Architecture

Architecture documentation for the BaseCallbackHandler class in base.py from the langchain codebase.

Class python

Entity Profile

Dependency Diagram

graph TD
  af283d05_75a6_5813_267b_f03a32501460["BaseCallbackHandler"]
  8d0067ae_0de0_c143_63e7_e97f7fd9f614["LLMManagerMixin"]
  af283d05_75a6_5813_267b_f03a32501460 -->|extends| 8d0067ae_0de0_c143_63e7_e97f7fd9f614
  59331c5d_55fc_8bfa_35c9_66bba01f8813["ChainManagerMixin"]
  af283d05_75a6_5813_267b_f03a32501460 -->|extends| 59331c5d_55fc_8bfa_35c9_66bba01f8813
  c9d25419_44e4_bde7_ebba_40ba46d3cb6a["ToolManagerMixin"]
  af283d05_75a6_5813_267b_f03a32501460 -->|extends| c9d25419_44e4_bde7_ebba_40ba46d3cb6a
  2ae8b961_1d1c_dfc1_f084_03c3a285b94a["RetrieverManagerMixin"]
  af283d05_75a6_5813_267b_f03a32501460 -->|extends| 2ae8b961_1d1c_dfc1_f084_03c3a285b94a
  3b53de05_0697_704a_50e8_c5f9aaeba5ae["CallbackManagerMixin"]
  af283d05_75a6_5813_267b_f03a32501460 -->|extends| 3b53de05_0697_704a_50e8_c5f9aaeba5ae
  cb81f035_6209_92da_5f1a_e74d00943d49["RunManagerMixin"]
  af283d05_75a6_5813_267b_f03a32501460 -->|extends| cb81f035_6209_92da_5f1a_e74d00943d49
  e787cbbd_76a7_b640_29ac_5595d6b9afee["base.py"]
  af283d05_75a6_5813_267b_f03a32501460 -->|defined in| e787cbbd_76a7_b640_29ac_5595d6b9afee
  fb21f968_7e97_cf3c_1bdc_68029773f387["ignore_llm()"]
  af283d05_75a6_5813_267b_f03a32501460 -->|method| fb21f968_7e97_cf3c_1bdc_68029773f387
  65abac8d_616d_0284_356c_f04093a5a909["ignore_retry()"]
  af283d05_75a6_5813_267b_f03a32501460 -->|method| 65abac8d_616d_0284_356c_f04093a5a909
  2c12eacd_f4fd_561d_53dc_3117a96a3f0d["ignore_chain()"]
  af283d05_75a6_5813_267b_f03a32501460 -->|method| 2c12eacd_f4fd_561d_53dc_3117a96a3f0d
  662c1a39_eb94_3901_56cc_b3a8f0780d6f["ignore_agent()"]
  af283d05_75a6_5813_267b_f03a32501460 -->|method| 662c1a39_eb94_3901_56cc_b3a8f0780d6f
  e1163d91_469d_5d4d_ce05_d59f3cd951ef["ignore_retriever()"]
  af283d05_75a6_5813_267b_f03a32501460 -->|method| e1163d91_469d_5d4d_ce05_d59f3cd951ef
  a2e30b2e_158f_862e_178f_2a892dff8267["ignore_chat_model()"]
  af283d05_75a6_5813_267b_f03a32501460 -->|method| a2e30b2e_158f_862e_178f_2a892dff8267
  00916715_52d2_d926_6910_014aaf8f9720["ignore_custom_event()"]
  af283d05_75a6_5813_267b_f03a32501460 -->|method| 00916715_52d2_d926_6910_014aaf8f9720

Relationship Graph

Source Code

libs/core/langchain_core/callbacks/base.py lines 435–484

class BaseCallbackHandler(
    LLMManagerMixin,
    ChainManagerMixin,
    ToolManagerMixin,
    RetrieverManagerMixin,
    CallbackManagerMixin,
    RunManagerMixin,
):
    """Base callback handler."""

    raise_error: bool = False
    """Whether to raise an error if an exception occurs."""

    run_inline: bool = False
    """Whether to run the callback inline."""

    @property
    def ignore_llm(self) -> bool:
        """Whether to ignore LLM callbacks."""
        return False

    @property
    def ignore_retry(self) -> bool:
        """Whether to ignore retry callbacks."""
        return False

    @property
    def ignore_chain(self) -> bool:
        """Whether to ignore chain callbacks."""
        return False

    @property
    def ignore_agent(self) -> bool:
        """Whether to ignore agent callbacks."""
        return False

    @property
    def ignore_retriever(self) -> bool:
        """Whether to ignore retriever callbacks."""
        return False

    @property
    def ignore_chat_model(self) -> bool:
        """Whether to ignore chat model callbacks."""
        return False

    @property
    def ignore_custom_event(self) -> bool:
        """Ignore custom event."""
        return False

Defined In

Extends

Source

Frequently Asked Questions

What is the BaseCallbackHandler class?
BaseCallbackHandler is a class in the langchain codebase, defined in libs/core/langchain_core/callbacks/base.py.
Where is BaseCallbackHandler defined?
BaseCallbackHandler is defined in libs/core/langchain_core/callbacks/base.py at line 435.
What does BaseCallbackHandler extend?
BaseCallbackHandler extends LLMManagerMixin, ChainManagerMixin, ToolManagerMixin, RetrieverManagerMixin, CallbackManagerMixin, RunManagerMixin.

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