'''
Copyright 2020 The Ray Authors.

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
limitations under the License.

This source file is adapted here because ray does not fully support Windows.

Copyright (c) Microsoft Corporation.
'''

from flaml.tune import trial_runner
from flaml.tune.trial import Trial


class TrialScheduler:
    """Interface for implementing a Trial Scheduler class."""

    CONTINUE = "CONTINUE"  #: Status for continuing trial execution
    PAUSE = "PAUSE"  #: Status for pausing trial execution
    STOP = "STOP"  #: Status for stopping trial execution

    def on_trial_add(self, trial_runner: "trial_runner.TrialRunner",
                     trial: Trial):
        pass

    def on_trial_remove(self, trial_runner: "trial_runner.TrialRunner",
                        trial: Trial):
        pass