Source code for flwr.app.message_type

# Copyright 2026 Flower Labs GmbH. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
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# ==============================================================================
"""MessageType constants."""

from __future__ import annotations



[docs]
class MessageType:
    """Message type."""

    TRAIN = "train"
    EVALUATE = "evaluate"
    QUERY = "query"

    def __new__(cls) -> MessageType:
        """Prevent instantiation."""
        raise TypeError(f"{cls.__name__} cannot be instantiated.")