aws_smithy_observability/
noop.rs

1/*
2 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
3 * SPDX-License-Identifier: Apache-2.0
4 */
5
6//! An noop implementation of the Meter traits
7
8use std::marker::PhantomData;
9use std::{fmt::Debug, sync::Arc};
10
11use crate::instruments::{
12    AsyncInstrumentBuilder, AsyncMeasure, Histogram, InstrumentBuilder, MonotonicCounter,
13    ProvideInstrument, UpDownCounter,
14};
15use crate::{
16    attributes::Attributes,
17    context::Context,
18    meter::{Meter, ProvideMeter},
19};
20
21#[derive(Debug)]
22pub(crate) struct NoopMeterProvider;
23impl ProvideMeter for NoopMeterProvider {
24    fn get_meter(&self, _scope: &'static str, _attributes: Option<&Attributes>) -> Meter {
25        Meter::new(Arc::new(NoopMeter))
26    }
27}
28
29#[derive(Debug)]
30pub(crate) struct NoopMeter;
31impl ProvideInstrument for NoopMeter {
32    fn create_gauge(
33        &self,
34        _builder: AsyncInstrumentBuilder<'_, Arc<dyn AsyncMeasure<Value = f64>>, f64>,
35    ) -> Arc<dyn AsyncMeasure<Value = f64>> {
36        Arc::new(NoopAsyncMeasurement(PhantomData::<f64>))
37    }
38
39    fn create_up_down_counter(
40        &self,
41        _builder: InstrumentBuilder<'_, Arc<dyn UpDownCounter>>,
42    ) -> Arc<dyn UpDownCounter> {
43        Arc::new(NoopUpDownCounter)
44    }
45
46    fn create_async_up_down_counter(
47        &self,
48        _builder: AsyncInstrumentBuilder<'_, Arc<dyn AsyncMeasure<Value = i64>>, i64>,
49    ) -> Arc<dyn AsyncMeasure<Value = i64>> {
50        Arc::new(NoopAsyncMeasurement(PhantomData::<i64>))
51    }
52
53    fn create_monotonic_counter(
54        &self,
55        _builder: InstrumentBuilder<'_, Arc<dyn MonotonicCounter>>,
56    ) -> Arc<dyn MonotonicCounter> {
57        Arc::new(NoopMonotonicCounter)
58    }
59
60    fn create_async_monotonic_counter(
61        &self,
62        _builder: AsyncInstrumentBuilder<'_, Arc<dyn AsyncMeasure<Value = u64>>, u64>,
63    ) -> Arc<dyn AsyncMeasure<Value = u64>> {
64        Arc::new(NoopAsyncMeasurement(PhantomData::<u64>))
65    }
66
67    fn create_histogram(
68        &self,
69        _builder: InstrumentBuilder<'_, Arc<dyn Histogram>>,
70    ) -> Arc<dyn Histogram> {
71        Arc::new(NoopHistogram)
72    }
73}
74
75#[derive(Debug)]
76struct NoopAsyncMeasurement<T: Send + Sync + Debug>(PhantomData<T>);
77impl<T: Send + Sync + Debug> AsyncMeasure for NoopAsyncMeasurement<T> {
78    type Value = T;
79
80    fn record(&self, _value: T, _attributes: Option<&Attributes>, _context: Option<&dyn Context>) {}
81
82    fn stop(&self) {}
83}
84
85#[derive(Debug)]
86struct NoopUpDownCounter;
87impl UpDownCounter for NoopUpDownCounter {
88    fn add(&self, _value: i64, _attributes: Option<&Attributes>, _context: Option<&dyn Context>) {}
89}
90
91#[derive(Debug)]
92struct NoopMonotonicCounter;
93impl MonotonicCounter for NoopMonotonicCounter {
94    fn add(&self, _value: u64, _attributes: Option<&Attributes>, _context: Option<&dyn Context>) {}
95}
96
97#[derive(Debug)]
98struct NoopHistogram;
99impl Histogram for NoopHistogram {
100    fn record(
101        &self,
102        _value: f64,
103        _attributes: Option<&Attributes>,
104        _context: Option<&dyn Context>,
105    ) {
106    }
107}
aws_smithy_observability/noop.rs

aws_smithy_observability/
noop.rs
