mirror of
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132 lines
4.7 KiB
Go
132 lines
4.7 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package instrument // import "go.opentelemetry.io/otel/metric/instrument"
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import (
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"context"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/metric/unit"
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)
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// Float64Observable describes a set of instruments used asynchronously to
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// record float64 measurements once per collection cycle. Observations of
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// these instruments are only made within a callback.
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//
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// Warning: methods may be added to this interface in minor releases.
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type Float64Observable interface {
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Asynchronous
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float64Observable()
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}
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// Float64ObservableCounter is an instrument used to asynchronously record
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// increasing float64 measurements once per collection cycle. Observations are
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// only made within a callback for this instrument. The value observed is
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// assumed the to be the cumulative sum of the count.
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//
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// Warning: methods may be added to this interface in minor releases.
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type Float64ObservableCounter interface{ Float64Observable }
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// Float64ObservableUpDownCounter is an instrument used to asynchronously
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// record float64 measurements once per collection cycle. Observations are only
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// made within a callback for this instrument. The value observed is assumed
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// the to be the cumulative sum of the count.
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//
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// Warning: methods may be added to this interface in minor releases.
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type Float64ObservableUpDownCounter interface{ Float64Observable }
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// Float64ObservableGauge is an instrument used to asynchronously record
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// instantaneous float64 measurements once per collection cycle. Observations
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// are only made within a callback for this instrument.
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//
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// Warning: methods may be added to this interface in minor releases.
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type Float64ObservableGauge interface{ Float64Observable }
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// Float64Observer is a recorder of float64 measurements.
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//
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// Warning: methods may be added to this interface in minor releases.
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type Float64Observer interface {
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Observe(value float64, attributes ...attribute.KeyValue)
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}
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// Float64Callback is a function registered with a Meter that makes
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// observations for a Float64Observerable instrument it is registered with.
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// Calls to the Float64Observer record measurement values for the
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// Float64Observable.
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//
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// The function needs to complete in a finite amount of time and the deadline
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// of the passed context is expected to be honored.
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//
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// The function needs to make unique observations across all registered
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// Float64Callbacks. Meaning, it should not report measurements with the same
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// attributes as another Float64Callbacks also registered for the same
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// instrument.
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//
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// The function needs to be concurrent safe.
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type Float64Callback func(context.Context, Float64Observer) error
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// Float64ObserverConfig contains options for Asynchronous instruments that
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// observe float64 values.
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type Float64ObserverConfig struct {
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description string
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unit unit.Unit
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callbacks []Float64Callback
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}
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// NewFloat64ObserverConfig returns a new Float64ObserverConfig with all opts
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// applied.
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func NewFloat64ObserverConfig(opts ...Float64ObserverOption) Float64ObserverConfig {
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var config Float64ObserverConfig
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for _, o := range opts {
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config = o.applyFloat64Observer(config)
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}
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return config
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}
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// Description returns the Config description.
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func (c Float64ObserverConfig) Description() string {
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return c.description
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}
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// Unit returns the Config unit.
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func (c Float64ObserverConfig) Unit() unit.Unit {
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return c.unit
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}
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// Callbacks returns the Config callbacks.
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func (c Float64ObserverConfig) Callbacks() []Float64Callback {
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return c.callbacks
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}
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// Float64ObserverOption applies options to float64 Observer instruments.
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type Float64ObserverOption interface {
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applyFloat64Observer(Float64ObserverConfig) Float64ObserverConfig
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}
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type float64ObserverOptionFunc func(Float64ObserverConfig) Float64ObserverConfig
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func (fn float64ObserverOptionFunc) applyFloat64Observer(cfg Float64ObserverConfig) Float64ObserverConfig {
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return fn(cfg)
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}
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// WithFloat64Callback adds callback to be called for an instrument.
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func WithFloat64Callback(callback Float64Callback) Float64ObserverOption {
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return float64ObserverOptionFunc(func(cfg Float64ObserverConfig) Float64ObserverConfig {
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cfg.callbacks = append(cfg.callbacks, callback)
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return cfg
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})
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}
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