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131 lines
4.5 KiB
Go
131 lines
4.5 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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)
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// Int64Observable describes a set of instruments used asynchronously to record
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// int64 measurements once per collection cycle. Observations of these
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// 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 Int64Observable interface {
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Asynchronous
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int64Observable()
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}
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// Int64ObservableCounter is an instrument used to asynchronously record
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// increasing int64 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 Int64ObservableCounter interface{ Int64Observable }
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// Int64ObservableUpDownCounter is an instrument used to asynchronously record
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// int64 measurements once per collection cycle. Observations are only made
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// within a callback for this instrument. The value observed is assumed the to
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// 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 Int64ObservableUpDownCounter interface{ Int64Observable }
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// Int64ObservableGauge is an instrument used to asynchronously record
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// instantaneous int64 measurements once per collection cycle. Observations are
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// 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 Int64ObservableGauge interface{ Int64Observable }
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// Int64Observer is a recorder of int64 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 Int64Observer interface {
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Observe(value int64, attributes ...attribute.KeyValue)
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}
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// Int64Callback is a function registered with a Meter that makes
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// observations for a Int64Observerable instrument it is registered with.
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// Calls to the Int64Observer record measurement values for the
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// Int64Observable.
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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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// Int64Callback. Meaning, it should not report measurements with the same
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// attributes as another Int64Callbacks 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 Int64Callback func(context.Context, Int64Observer) error
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// Int64ObserverConfig contains options for Asynchronous instruments that
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// observe int64 values.
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type Int64ObserverConfig struct {
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description string
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unit string
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callbacks []Int64Callback
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}
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// NewInt64ObserverConfig returns a new Int64ObserverConfig with all opts
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// applied.
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func NewInt64ObserverConfig(opts ...Int64ObserverOption) Int64ObserverConfig {
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var config Int64ObserverConfig
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for _, o := range opts {
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config = o.applyInt64Observer(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 Int64ObserverConfig) 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 Int64ObserverConfig) Unit() string {
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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 Int64ObserverConfig) Callbacks() []Int64Callback {
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return c.callbacks
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}
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// Int64ObserverOption applies options to int64 Observer instruments.
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type Int64ObserverOption interface {
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applyInt64Observer(Int64ObserverConfig) Int64ObserverConfig
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}
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type int64ObserverOptionFunc func(Int64ObserverConfig) Int64ObserverConfig
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func (fn int64ObserverOptionFunc) applyInt64Observer(cfg Int64ObserverConfig) Int64ObserverConfig {
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return fn(cfg)
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}
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// WithInt64Callback adds callback to be called for an instrument.
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func WithInt64Callback(callback Int64Callback) Int64ObserverOption {
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return int64ObserverOptionFunc(func(cfg Int64ObserverConfig) Int64ObserverConfig {
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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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