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from enum import Enum, auto


class DllmBlockType(Enum):
    """Type of a block during decoding."""

    IN_CONTEXT = auto()
    LAST_IN_CONTEXT = auto()
    OUT_OF_CONTEXT = auto()


class DllmBlockStatus(Enum):
    """State of a block during decoding."""

    DUMMY = auto()  # Placeholder block
    ACTIVE = auto()  # Currently being decoded
    TO_CACHE = auto()  # Ready to be cached
    IN_CACHE = auto()  # Already cached


class DllmReqStatus(Enum):
    """Status of a req during decoding."""

    # Waiting
    WAITING = auto()  # Waiting for prompts

    # Runtime states
    PENDING = auto()  # Pending to run
    PREFILLING = auto()  # Running prefilling
    DECODING = auto()  # Running decoding
    COMPLETED = auto()  # Completed generation

    # Finished
    FINISHED = auto()  # Completed generation