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cache.go
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cache.go
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// Copyright (c) 2022 The Jaeger Authors.
// Copyright (c) 2018 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 expvar
import (
"sync"
"github.com/jaegertracing/jaeger/pkg/metrics"
)
type cache struct {
lock sync.Mutex
counters map[string]metrics.Counter
gauges map[string]metrics.Gauge
timers map[string]metrics.Timer
histograms map[string]metrics.Histogram
}
func newCache() *cache {
return &cache{
counters: make(map[string]metrics.Counter),
gauges: make(map[string]metrics.Gauge),
timers: make(map[string]metrics.Timer),
histograms: make(map[string]metrics.Histogram),
}
}
func (r *cache) getOrSetCounter(name string, create func() metrics.Counter) metrics.Counter {
r.lock.Lock()
defer r.lock.Unlock()
c, ok := r.counters[name]
if !ok {
c = create()
r.counters[name] = c
}
return c
}
func (r *cache) getOrSetGauge(name string, create func() metrics.Gauge) metrics.Gauge {
r.lock.Lock()
defer r.lock.Unlock()
g, ok := r.gauges[name]
if !ok {
g = create()
r.gauges[name] = g
}
return g
}
func (r *cache) getOrSetTimer(name string, create func() metrics.Timer) metrics.Timer {
r.lock.Lock()
defer r.lock.Unlock()
t, ok := r.timers[name]
if !ok {
t = create()
r.timers[name] = t
}
return t
}
func (r *cache) getOrSetHistogram(name string, create func() metrics.Histogram) metrics.Histogram {
r.lock.Lock()
defer r.lock.Unlock()
t, ok := r.histograms[name]
if !ok {
t = create()
r.histograms[name] = t
}
return t
}