timerwheel 0.1.0

// Copyright © 2026-present The Timerwheel Authors. 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
// limitations under the License.

use crate::executor::ExecutorMetrics;

/// Observer for executor metric snapshots.
pub trait MetricSink: Send + Sync + 'static {
    /// Receives a point-in-time metrics snapshot after executor metric changes.
    fn observe_metrics(&self, _metrics: ExecutorMetrics) {}
}

/// Metric sink that ignores all snapshots.
#[derive(Debug, Default)]
pub struct NoopMetricSink;

impl MetricSink for NoopMetricSink {}