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* move Descriptor to sdkapi, add test * rename Descriptor to sdkapi * precommit * Move the rest of the sdkapi * use alias for Observation and Measurement * Changelog * pr num * comment Measurement and Observation * swap comments * move->moved
107 lines
3.2 KiB
Go
107 lines
3.2 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 sum // import "go.opentelemetry.io/otel/sdk/metric/aggregator/sum"
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import (
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"context"
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"go.opentelemetry.io/otel/metric/number"
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"go.opentelemetry.io/otel/metric/sdkapi"
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export "go.opentelemetry.io/otel/sdk/export/metric"
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"go.opentelemetry.io/otel/sdk/export/metric/aggregation"
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"go.opentelemetry.io/otel/sdk/metric/aggregator"
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)
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// Aggregator aggregates counter events.
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type Aggregator struct {
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// current holds current increments to this counter record
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// current needs to be aligned for 64-bit atomic operations.
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value number.Number
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}
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var _ export.Aggregator = &Aggregator{}
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var _ export.Subtractor = &Aggregator{}
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var _ aggregation.Sum = &Aggregator{}
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// New returns a new counter aggregator implemented by atomic
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// operations. This aggregator implements the aggregation.Sum
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// export interface.
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func New(cnt int) []Aggregator {
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return make([]Aggregator, cnt)
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}
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// Aggregation returns an interface for reading the state of this aggregator.
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func (c *Aggregator) Aggregation() aggregation.Aggregation {
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return c
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}
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// Kind returns aggregation.SumKind.
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func (c *Aggregator) Kind() aggregation.Kind {
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return aggregation.SumKind
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}
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// Sum returns the last-checkpointed sum. This will never return an
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// error.
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func (c *Aggregator) Sum() (number.Number, error) {
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return c.value, nil
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}
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// SynchronizedMove atomically saves the current value into oa and resets the
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// current sum to zero.
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func (c *Aggregator) SynchronizedMove(oa export.Aggregator, _ *sdkapi.Descriptor) error {
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if oa == nil {
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c.value.SetRawAtomic(0)
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return nil
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}
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o, _ := oa.(*Aggregator)
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if o == nil {
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return aggregator.NewInconsistentAggregatorError(c, oa)
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}
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o.value = c.value.SwapNumberAtomic(number.Number(0))
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return nil
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}
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// Update atomically adds to the current value.
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func (c *Aggregator) Update(_ context.Context, num number.Number, desc *sdkapi.Descriptor) error {
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c.value.AddNumberAtomic(desc.NumberKind(), num)
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return nil
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}
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// Merge combines two counters by adding their sums.
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func (c *Aggregator) Merge(oa export.Aggregator, desc *sdkapi.Descriptor) error {
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o, _ := oa.(*Aggregator)
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if o == nil {
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return aggregator.NewInconsistentAggregatorError(c, oa)
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}
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c.value.AddNumber(desc.NumberKind(), o.value)
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return nil
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}
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func (c *Aggregator) Subtract(opAgg, resAgg export.Aggregator, descriptor *sdkapi.Descriptor) error {
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op, _ := opAgg.(*Aggregator)
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if op == nil {
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return aggregator.NewInconsistentAggregatorError(c, opAgg)
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}
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res, _ := resAgg.(*Aggregator)
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if res == nil {
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return aggregator.NewInconsistentAggregatorError(c, resAgg)
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}
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res.value = c.value
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res.value.AddNumber(descriptor.NumberKind(), number.NewNumberSignChange(descriptor.NumberKind(), op.value))
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return nil
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}
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