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// 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 metric // import "go.opentelemetry.io/otel/metric"
import (
"context"
"go.opentelemetry.io/otel/metric/embedded"
)
// Int64Observable describes a set of instruments used asynchronously to record
// int64 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 Int64Observable interface {
Observable
int64Observable()
}
// Int64ObservableCounter is an instrument used to asynchronously record
// increasing int64 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. See
// package documentation on API implementation for information on how to set
// default behavior for unimplemented methods.
type Int64ObservableCounter interface {
// Users of the interface can ignore this. This embedded type is only used
// by implementations of this interface. See the "API Implementations"
// section of the package documentation for more information.
embedded.Int64ObservableCounter
Int64Observable
}
// Int64ObservableCounterConfig contains options for asynchronous counter
// instruments that record int64 values.
type Int64ObservableCounterConfig struct {
description string
unit string
callbacks []Int64Callback
}
// NewInt64ObservableCounterConfig returns a new [Int64ObservableCounterConfig]
// with all opts applied.
func NewInt64ObservableCounterConfig(opts ...Int64ObservableCounterOption) Int64ObservableCounterConfig {
var config Int64ObservableCounterConfig
for _, o := range opts {
config = o.applyInt64ObservableCounter(config)
}
return config
}
// Description returns the configured description.
func (c Int64ObservableCounterConfig) Description() string {
return c.description
}
// Unit returns the configured unit.
func (c Int64ObservableCounterConfig) Unit() string {
return c.unit
}
// Callbacks returns the configured callbacks.
func (c Int64ObservableCounterConfig) Callbacks() []Int64Callback {
return c.callbacks
}
// Int64ObservableCounterOption applies options to a
// [Int64ObservableCounterConfig]. See [Int64ObservableOption] and
// [InstrumentOption] for other options that can be used as an
// Int64ObservableCounterOption.
type Int64ObservableCounterOption interface {
applyInt64ObservableCounter(Int64ObservableCounterConfig) Int64ObservableCounterConfig
}
// Int64ObservableUpDownCounter is an instrument used to asynchronously record
// int64 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. See
// package documentation on API implementation for information on how to set
// default behavior for unimplemented methods.
type Int64ObservableUpDownCounter interface {
// Users of the interface can ignore this. This embedded type is only used
// by implementations of this interface. See the "API Implementations"
// section of the package documentation for more information.
embedded.Int64ObservableUpDownCounter
Int64Observable
}
// Int64ObservableUpDownCounterConfig contains options for asynchronous counter
// instruments that record int64 values.
type Int64ObservableUpDownCounterConfig struct {
description string
unit string
callbacks []Int64Callback
}
// NewInt64ObservableUpDownCounterConfig returns a new
// [Int64ObservableUpDownCounterConfig] with all opts applied.
func NewInt64ObservableUpDownCounterConfig(opts ...Int64ObservableUpDownCounterOption) Int64ObservableUpDownCounterConfig {
var config Int64ObservableUpDownCounterConfig
for _, o := range opts {
config = o.applyInt64ObservableUpDownCounter(config)
}
return config
}
// Description returns the configured description.
func (c Int64ObservableUpDownCounterConfig) Description() string {
return c.description
}
// Unit returns the configured unit.
func (c Int64ObservableUpDownCounterConfig) Unit() string {
return c.unit
}
// Callbacks returns the configured callbacks.
func (c Int64ObservableUpDownCounterConfig) Callbacks() []Int64Callback {
return c.callbacks
}
// Int64ObservableUpDownCounterOption applies options to a
// [Int64ObservableUpDownCounterConfig]. See [Int64ObservableOption] and
// [InstrumentOption] for other options that can be used as an
// Int64ObservableUpDownCounterOption.
type Int64ObservableUpDownCounterOption interface {
applyInt64ObservableUpDownCounter(Int64ObservableUpDownCounterConfig) Int64ObservableUpDownCounterConfig
}
// Int64ObservableGauge is an instrument used to asynchronously record
// instantaneous int64 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. See
// package documentation on API implementation for information on how to set
// default behavior for unimplemented methods.
type Int64ObservableGauge interface {
// Users of the interface can ignore this. This embedded type is only used
// by implementations of this interface. See the "API Implementations"
// section of the package documentation for more information.
embedded.Int64ObservableGauge
Int64Observable
}
// Int64ObservableGaugeConfig contains options for asynchronous counter
// instruments that record int64 values.
type Int64ObservableGaugeConfig struct {
description string
unit string
callbacks []Int64Callback
}
// NewInt64ObservableGaugeConfig returns a new [Int64ObservableGaugeConfig]
// with all opts applied.
func NewInt64ObservableGaugeConfig(opts ...Int64ObservableGaugeOption) Int64ObservableGaugeConfig {
var config Int64ObservableGaugeConfig
for _, o := range opts {
config = o.applyInt64ObservableGauge(config)
}
return config
}
// Description returns the configured description.
func (c Int64ObservableGaugeConfig) Description() string {
return c.description
}
// Unit returns the configured unit.
func (c Int64ObservableGaugeConfig) Unit() string {
return c.unit
}
// Callbacks returns the configured callbacks.
func (c Int64ObservableGaugeConfig) Callbacks() []Int64Callback {
return c.callbacks
}
// Int64ObservableGaugeOption applies options to a
// [Int64ObservableGaugeConfig]. See [Int64ObservableOption] and
// [InstrumentOption] for other options that can be used as an
// Int64ObservableGaugeOption.
type Int64ObservableGaugeOption interface {
applyInt64ObservableGauge(Int64ObservableGaugeConfig) Int64ObservableGaugeConfig
}
// Int64Observer is a recorder of int64 measurements.
//
// Warning: Methods may be added to this interface in minor releases. See
// package documentation on API implementation for information on how to set
// default behavior for unimplemented methods.
type Int64Observer interface {
// Users of the interface can ignore this. This embedded type is only used
// by implementations of this interface. See the "API Implementations"
// section of the package documentation for more information.
embedded.Int64Observer
// Observe records the int64 value.
//
// Use the WithAttributeSet (or, if performance is not a concern,
// the WithAttributes) option to include measurement attributes.
Observe(value int64, options ...ObserveOption)
}
// Int64Callback is a function registered with a Meter that makes observations
// for an Int64Observerable instrument it is registered with. Calls to the
// Int64Observer record measurement values for the Int64Observable.
//
// 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
// Int64Callbacks. Meaning, it should not report measurements with the same
// attributes as another Int64Callbacks also registered for the same
// instrument.
//
// The function needs to be concurrent safe.
type Int64Callback func(context.Context, Int64Observer) error
// Int64ObservableOption applies options to int64 Observer instruments.
type Int64ObservableOption interface {
Int64ObservableCounterOption
Int64ObservableUpDownCounterOption
Int64ObservableGaugeOption
}
type int64CallbackOpt struct {
cback Int64Callback
}
func (o int64CallbackOpt) applyInt64ObservableCounter(cfg Int64ObservableCounterConfig) Int64ObservableCounterConfig {
cfg.callbacks = append(cfg.callbacks, o.cback)
return cfg
}
func (o int64CallbackOpt) applyInt64ObservableUpDownCounter(cfg Int64ObservableUpDownCounterConfig) Int64ObservableUpDownCounterConfig {
cfg.callbacks = append(cfg.callbacks, o.cback)
return cfg
}
func (o int64CallbackOpt) applyInt64ObservableGauge(cfg Int64ObservableGaugeConfig) Int64ObservableGaugeConfig {
cfg.callbacks = append(cfg.callbacks, o.cback)
return cfg
}
// WithInt64Callback adds callback to be called for an instrument.
func WithInt64Callback(callback Int64Callback) Int64ObservableOption {
return int64CallbackOpt{callback}
}