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- // Copyright (c) 2017 Uber Technologies, Inc.
- //
- // 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.
- package metrics
- import (
- "time"
- )
- // NSOptions defines the name and tags map associated with a factory namespace
- type NSOptions struct {
- Name string
- Tags map[string]string
- }
- // Options defines the information associated with a metric
- type Options struct {
- Name string
- Tags map[string]string
- Help string
- }
- // TimerOptions defines the information associated with a metric
- type TimerOptions struct {
- Name string
- Tags map[string]string
- Help string
- Buckets []time.Duration
- }
- // HistogramOptions defines the information associated with a metric
- type HistogramOptions struct {
- Name string
- Tags map[string]string
- Help string
- Buckets []float64
- }
- // Factory creates new metrics
- type Factory interface {
- Counter(metric Options) Counter
- Timer(metric TimerOptions) Timer
- Gauge(metric Options) Gauge
- Histogram(metric HistogramOptions) Histogram
- // Namespace returns a nested metrics factory.
- Namespace(scope NSOptions) Factory
- }
- // NullFactory is a metrics factory that returns NullCounter, NullTimer, and NullGauge.
- var NullFactory Factory = nullFactory{}
- type nullFactory struct{}
- func (nullFactory) Counter(options Options) Counter {
- return NullCounter
- }
- func (nullFactory) Timer(options TimerOptions) Timer {
- return NullTimer
- }
- func (nullFactory) Gauge(options Options) Gauge {
- return NullGauge
- }
- func (nullFactory) Histogram(options HistogramOptions) Histogram {
- return NullHistogram
- }
- func (nullFactory) Namespace(scope NSOptions) Factory { return NullFactory }
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