1
0
mirror of https://github.com/open-telemetry/opentelemetry-go.git synced 2024-12-16 10:19:23 +02:00
opentelemetry-go/api/metric/global.go
Joshua MacDonald be8fb0b4e2 Golang metrics prototype (#100)
* initial metrics work

* rename cumulative to counter

* rename bidirectional to nonmonotonic

* rename unidirectional to monotonic

* rename nonnegative to signed

this changes the default semantics a bit - before the change measure
could record negative values by default, now it can't.

The specification draft currently specifies both NonNegative and
Signed, but I think it's a mistake.

* rename instrument to descriptor

* license

* rework measurement values

* make measurement value a tagged union

* simplify to one kind of metrics

* add observers

* change some interfaces to match the spec

* keep integral measurement separate from floating ones

* remove duplicated measurement type

* add checking for options

* reorder some fields and functions

* rename a function

to avoid confusion between the Handle type and the Measure type

* drop disabled field from descriptor

* add back typed API for metrics

* make metric options type safe

* merge alternatives into a single bool

* make value kind name less stuttery

* fix observation callback prototype

* drop context parameter from NewHandle

* drop useless parameter names

* make descriptor an opaque struct

* use a store helper

* handle comment fixes

* reword Alternate comment

* drop the "any value" metrics

* make measurement value simpler

* document value stuff

* add tests for values

* docs

* do not panic if there is no span ID in the event
2019-10-08 15:45:49 -07:00

34 lines
1011 B
Go

// Copyright 2019, OpenTelemetry 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 "sync/atomic"
var global atomic.Value
// GlobalMeter returns a meter registered as a global meter. If no
// meter is registered then an instance of noop Meter is returned.
func GlobalMeter() Meter {
if t := global.Load(); t != nil {
return t.(Meter)
}
return noopMeter{}
}
// SetGlobalMeter sets provided meter as a global meter.
func SetGlobalMeter(t Meter) {
global.Store(t)
}