from typing import Dict, Any, Iterable


class FixAdapter:
    def __init__(self, messages: Iterable[Dict[str, Any]]):
        self._messages = list(messages)

    def stream(self):
        # Yield messages emulating FIX field dicts
        for m in self._messages:
            yield {"venue": m.get("venue"), "signal": m.get("signal"), "value": m.get("value"), "ts": m.get("ts")}