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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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