Repository: redis/redis-py
File: redis/connection.py (Python)

Code before:
        self._event_dispatcher = self.connection_kwargs.get("event_dispatcher", None)
        if self._event_dispatcher is None:
            self._event_dispatcher = EventDispatcher()

        # a lock to protect the critical section in _checkpid().
        # this lock is acquired when the process id changes, such as
        # after a fork. during this time, multiple threads in the child
        # process could attempt to acquire this lock. the first thread
        # to acquire the lock will reset the data structures and lock
        # object of this pool. subsequent threads acquiring this lock
        # will notice the first thread already did the work and simply
        # release the lock.

        self._fork_lock = threading.RLock()

        if self.cache is None:
            self._lock = threading.RLock()
        else:
            # TODO: To avoid breaking changes during the bug fix, we have to keep non-reentrant lock.
            # TODO: Remove this before next major version (7.0.0)
            self._lock = threading.Lock()

        self.reset()

    def __repr__(self) -> (str, str):
        return (
            f"<{type(self).__module__}.{type(self).__name__}"
            f"({repr(self.connection_class(**self.connection_kwargs))})>"
        )

    def get_protocol(self):
        """
        Returns:
            The RESP protocol version, or ``None`` if the protocol is not specified,
            in which case the server default will be used.
        """
        return self.connection_kwargs.get("protocol", None)

    def reset(self) -> None:
        self._created_connections = 0
        self._available_connections = []
        self._in_use_connections = set()

        # this must be the last operation in this method. while reset() is
        # called when holding _fork_lock, other threads in this process
        # can call _checkpid() which compares self.pid and os.getpid() without
        # holding any lock (for performance reasons). keeping this assignment
        # as the last operation ensures that those other threads will also
        # notice a pid difference and block waiting for the first thread to
        # release _fork_lock. when each of these threads eventually acquire
        # _fork_lock, they will notice that another thread already called

Review comment (suggestion):
The updated __repr__ avoids side effects by not instantiating a connection, which is good. To ensure deterministic output (if key order matters), consider explicitly controlling the order of connection_kwargs (e.g., by joining a list with a predefined key sequence) or document the ordering expectations.
```suggestion
        # Define a predefined key sequence for deterministic ordering
        predefined_order = ["host", "port", "db", "username", "password", "protocol"]
        # Sort keys: first by predefined order, then alphabetically for remaining keys
        sorted_keys = (
            [key for key in predefined_order if key in self.connection_kwargs]
            + sorted(k for k in self.connection_kwargs if k not in predefined_order)
        )
        conn_kwargs = ",".join([f"{k}={self.connection_kwargs[k]}" for k in sorted_keys])
```

Code after:
        self._event_dispatcher = self.connection_kwargs.get("event_dispatcher", None)
        if self._event_dispatcher is None:
            self._event_dispatcher = EventDispatcher()

        # a lock to protect the critical section in _checkpid().
        # this lock is acquired when the process id changes, such as
        # after a fork. during this time, multiple threads in the child
        # process could attempt to acquire this lock. the first thread
        # to acquire the lock will reset the data structures and lock
        # object of this pool. subsequent threads acquiring this lock
        # will notice the first thread already did the work and simply
        # release the lock.

        self._fork_lock = threading.RLock()

        if self.cache is None:
            self._lock = threading.RLock()
        else:
            # TODO: To avoid breaking changes during the bug fix, we have to keep non-reentrant lock.
            # TODO: Remove this before next major version (7.0.0)
            self._lock = threading.Lock()

        self.reset()

    def __repr__(self) -> str:
        conn_kwargs = ",".join([f"{k}={v}" for k, v in self.connection_kwargs.items()])
        return (
            f"<{self.__class__.__module__}.{self.__class__.__name__}"
            f"(<{self.connection_class.__module__}.{self.connection_class.__name__}"
            f"({conn_kwargs})>)>"
        )

    def get_protocol(self):
        """
        Returns:
            The RESP protocol version, or ``None`` if the protocol is not specified,
            in which case the server default will be used.
        """
        return self.connection_kwargs.get("protocol", None)

    def reset(self) -> None:
        self._created_connections = 0
        self._available_connections = []
        self._in_use_connections = set()

        # this must be the last operation in this method. while reset() is
        # called when holding _fork_lock, other threads in this process
        # can call _checkpid() which compares self.pid and os.getpid() without
        # holding any lock (for performance reasons). keeping this assignment
        # as the last operation ensures that those other threads will also
        # notice a pid difference and block waiting for the first thread to