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scope.go
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scope.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package metrics
import "github.com/uber-go/tally"
type cachedMetricScope struct {
tally.Scope
counters map[string]tally.Counter
timers map[string]tally.Timer
gauges map[string]tally.Gauge
}
func newScope(scope tally.Scope, metricDefs map[MetricName]MetricType) tally.Scope {
s := &cachedMetricScope{
Scope: scope,
counters: make(map[string]tally.Counter),
timers: make(map[string]tally.Timer),
gauges: make(map[string]tally.Gauge),
}
for name, t := range metricDefs {
switch t {
case Counter:
s.counters[string(name)] = s.Scope.Counter(string(name))
case Timer:
s.timers[string(name)] = s.Scope.Timer(string(name))
case Gauge:
s.gauges[string(name)] = s.Scope.Gauge(string(name))
}
}
return s
}
func (s *cachedMetricScope) Counter(name string) tally.Counter {
counter, ok := s.counters[name]
if !ok {
// this is not a cached metric. Fall back to tally
counter = s.Scope.Counter(name)
}
return counter
}
func (s *cachedMetricScope) Timer(name string) tally.Timer {
timer, ok := s.timers[name]
if !ok {
// this is not a cached metric. Fall back to tally
timer = s.Scope.Timer(name)
}
return timer
}
func (s *cachedMetricScope) Gauge(name string) tally.Gauge {
gauge, ok := s.gauges[name]
if !ok {
// this is not a cached metric. Fall back to tally
gauge = s.Scope.Gauge(name)
}
return gauge
}