/
sum.go
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/
sum.go
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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 sum // import "go.opentelemetry.io/otel/sdk/metric/aggregator/sum"
import (
"context"
"go.opentelemetry.io/otel/metric/number"
"go.opentelemetry.io/otel/metric/sdkapi"
export "go.opentelemetry.io/otel/sdk/export/metric"
"go.opentelemetry.io/otel/sdk/export/metric/aggregation"
"go.opentelemetry.io/otel/sdk/metric/aggregator"
)
// Aggregator aggregates counter events.
type Aggregator struct {
// current holds current increments to this counter record
// current needs to be aligned for 64-bit atomic operations.
value number.Number
}
var _ export.Aggregator = &Aggregator{}
var _ aggregation.Sum = &Aggregator{}
// New returns a new counter aggregator implemented by atomic
// operations. This aggregator implements the aggregation.Sum
// export interface.
func New(cnt int) []Aggregator {
return make([]Aggregator, cnt)
}
// Aggregation returns an interface for reading the state of this aggregator.
func (c *Aggregator) Aggregation() aggregation.Aggregation {
return c
}
// Kind returns aggregation.SumKind.
func (c *Aggregator) Kind() aggregation.Kind {
return aggregation.SumKind
}
// Sum returns the last-checkpointed sum. This will never return an
// error.
func (c *Aggregator) Sum() (number.Number, error) {
return c.value, nil
}
// SynchronizedMove atomically saves the current value into oa and resets the
// current sum to zero.
func (c *Aggregator) SynchronizedMove(oa export.Aggregator, _ *sdkapi.Descriptor) error {
if oa == nil {
c.value.SetRawAtomic(0)
return nil
}
o, _ := oa.(*Aggregator)
if o == nil {
return aggregator.NewInconsistentAggregatorError(c, oa)
}
o.value = c.value.SwapNumberAtomic(number.Number(0))
return nil
}
// Update atomically adds to the current value.
func (c *Aggregator) Update(_ context.Context, num number.Number, desc *sdkapi.Descriptor) error {
c.value.AddNumberAtomic(desc.NumberKind(), num)
return nil
}
// Merge combines two counters by adding their sums.
func (c *Aggregator) Merge(oa export.Aggregator, desc *sdkapi.Descriptor) error {
o, _ := oa.(*Aggregator)
if o == nil {
return aggregator.NewInconsistentAggregatorError(c, oa)
}
c.value.AddNumber(desc.NumberKind(), o.value)
return nil
}