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/
registry.go
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/
registry.go
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// Copyright 2018, OpenCensus 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.
package metric
import (
"go.opencensus.io/metric/metricdata"
"log"
"time"
)
// Registry creates and manages a set of gauges.
// External synchronization is required if you want to add gauges to the same
// registry from multiple goroutines.
type Registry struct {
gauges map[string]*gauge
}
// NewRegistry initializes a new Registry.
func NewRegistry() *Registry {
return &Registry{
gauges: make(map[string]*gauge),
}
}
// AddFloat64Gauge creates and adds a new float64-valued gauge to this registry.
func (r *Registry) AddFloat64Gauge(name, description string, unit metricdata.Unit, labelKeys ...string) *Float64Gauge {
f := &Float64Gauge{
g: gauge{
isFloat: true,
},
}
r.initGauge(&f.g, labelKeys, name, description, unit)
return f
}
// AddInt64Gauge creates and adds a new int64-valued gauge to this registry.
func (r *Registry) AddInt64Gauge(name, description string, unit metricdata.Unit, labelKeys ...string) *Int64Gauge {
i := &Int64Gauge{}
r.initGauge(&i.g, labelKeys, name, description, unit)
return i
}
func (r *Registry) initGauge(g *gauge, labelKeys []string, name string, description string, unit metricdata.Unit) *gauge {
existing, ok := r.gauges[name]
if ok {
if existing.isFloat != g.isFloat {
log.Panicf("Gauge with name %s already exists with a different type", name)
}
}
g.keys = labelKeys
g.start = time.Now()
g.desc = metricdata.Descriptor{
Name: name,
Description: description,
Unit: unit,
LabelKeys: labelKeys,
}
r.gauges[name] = g
return g
}
// ReadAll reads all gauges in this registry and returns their values as metrics.
func (r *Registry) ReadAll() []*metricdata.Metric {
ms := make([]*metricdata.Metric, 0, len(r.gauges))
for _, g := range r.gauges {
ms = append(ms, g.read())
}
return ms
}