131 lines
4.7 KiB
Go
131 lines
4.7 KiB
Go
// Copyright The 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 instrument // import "go.opentelemetry.io/otel/metric/instrument"
|
|
|
|
import (
|
|
"context"
|
|
|
|
"go.opentelemetry.io/otel/attribute"
|
|
)
|
|
|
|
// Float64Observable describes a set of instruments used asynchronously to
|
|
// record float64 measurements once per collection cycle. Observations of
|
|
// these instruments are only made within a callback.
|
|
//
|
|
// Warning: methods may be added to this interface in minor releases.
|
|
type Float64Observable interface {
|
|
Asynchronous
|
|
|
|
float64Observable()
|
|
}
|
|
|
|
// Float64ObservableCounter is an instrument used to asynchronously record
|
|
// increasing float64 measurements once per collection cycle. Observations are
|
|
// only made within a callback for this instrument. The value observed is
|
|
// assumed the to be the cumulative sum of the count.
|
|
//
|
|
// Warning: methods may be added to this interface in minor releases.
|
|
type Float64ObservableCounter interface{ Float64Observable }
|
|
|
|
// Float64ObservableUpDownCounter is an instrument used to asynchronously
|
|
// record float64 measurements once per collection cycle. Observations are only
|
|
// made within a callback for this instrument. The value observed is assumed
|
|
// the to be the cumulative sum of the count.
|
|
//
|
|
// Warning: methods may be added to this interface in minor releases.
|
|
type Float64ObservableUpDownCounter interface{ Float64Observable }
|
|
|
|
// Float64ObservableGauge is an instrument used to asynchronously record
|
|
// instantaneous float64 measurements once per collection cycle. Observations
|
|
// are only made within a callback for this instrument.
|
|
//
|
|
// Warning: methods may be added to this interface in minor releases.
|
|
type Float64ObservableGauge interface{ Float64Observable }
|
|
|
|
// Float64Observer is a recorder of float64 measurements.
|
|
//
|
|
// Warning: methods may be added to this interface in minor releases.
|
|
type Float64Observer interface {
|
|
Observe(value float64, attributes ...attribute.KeyValue)
|
|
}
|
|
|
|
// Float64Callback is a function registered with a Meter that makes
|
|
// observations for a Float64Observerable instrument it is registered with.
|
|
// Calls to the Float64Observer record measurement values for the
|
|
// Float64Observable.
|
|
//
|
|
// The function needs to complete in a finite amount of time and the deadline
|
|
// of the passed context is expected to be honored.
|
|
//
|
|
// The function needs to make unique observations across all registered
|
|
// Float64Callbacks. Meaning, it should not report measurements with the same
|
|
// attributes as another Float64Callbacks also registered for the same
|
|
// instrument.
|
|
//
|
|
// The function needs to be concurrent safe.
|
|
type Float64Callback func(context.Context, Float64Observer) error
|
|
|
|
// Float64ObserverConfig contains options for Asynchronous instruments that
|
|
// observe float64 values.
|
|
type Float64ObserverConfig struct {
|
|
description string
|
|
unit string
|
|
callbacks []Float64Callback
|
|
}
|
|
|
|
// NewFloat64ObserverConfig returns a new Float64ObserverConfig with all opts
|
|
// applied.
|
|
func NewFloat64ObserverConfig(opts ...Float64ObserverOption) Float64ObserverConfig {
|
|
var config Float64ObserverConfig
|
|
for _, o := range opts {
|
|
config = o.applyFloat64Observer(config)
|
|
}
|
|
return config
|
|
}
|
|
|
|
// Description returns the Config description.
|
|
func (c Float64ObserverConfig) Description() string {
|
|
return c.description
|
|
}
|
|
|
|
// Unit returns the Config unit.
|
|
func (c Float64ObserverConfig) Unit() string {
|
|
return c.unit
|
|
}
|
|
|
|
// Callbacks returns the Config callbacks.
|
|
func (c Float64ObserverConfig) Callbacks() []Float64Callback {
|
|
return c.callbacks
|
|
}
|
|
|
|
// Float64ObserverOption applies options to float64 Observer instruments.
|
|
type Float64ObserverOption interface {
|
|
applyFloat64Observer(Float64ObserverConfig) Float64ObserverConfig
|
|
}
|
|
|
|
type float64ObserverOptionFunc func(Float64ObserverConfig) Float64ObserverConfig
|
|
|
|
func (fn float64ObserverOptionFunc) applyFloat64Observer(cfg Float64ObserverConfig) Float64ObserverConfig {
|
|
return fn(cfg)
|
|
}
|
|
|
|
// WithFloat64Callback adds callback to be called for an instrument.
|
|
func WithFloat64Callback(callback Float64Callback) Float64ObserverOption {
|
|
return float64ObserverOptionFunc(func(cfg Float64ObserverConfig) Float64ObserverConfig {
|
|
cfg.callbacks = append(cfg.callbacks, callback)
|
|
return cfg
|
|
})
|
|
}
|