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d8682c1999
* Create MeterImpl interface * Checkpoint w/ sdk.go building * Checkpoint working on global * api/global builds (test fails) * Test fix * All tests pass * Comments * Add two tests * Comments and uncomment tests * Precommit part 1 * Still working on tests * Lint * Add a test and a TODO * Cleanup * Lint * Interface()->Implementation() * Apply some feedback * From feedback * (A)Synchronous -> (A)Sync * Add a missing comment * Apply suggestions from code review Co-Authored-By: Krzesimir Nowak <qdlacz@gmail.com> * Rename a variable Co-authored-by: Krzesimir Nowak <qdlacz@gmail.com>
74 lines
2.4 KiB
Go
74 lines
2.4 KiB
Go
// Copyright 2019, 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/api/core"
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"go.opentelemetry.io/otel/api/metric"
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export "go.opentelemetry.io/otel/sdk/export/metric"
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"go.opentelemetry.io/otel/sdk/export/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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current core.Number
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// checkpoint is a temporary used during Checkpoint()
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// checkpoint needs to be aligned for 64-bit atomic operations.
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checkpoint core.Number
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}
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var _ export.Aggregator = &Aggregator{}
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var _ aggregator.Sum = &Aggregator{}
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// New returns a new counter aggregator implemented by atomic
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// operations. This aggregator implements the aggregator.Sum
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// export interface.
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func New() *Aggregator {
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return &Aggregator{}
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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() (core.Number, error) {
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return c.checkpoint, nil
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}
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// Checkpoint atomically saves the current value and resets the
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// current sum to zero.
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func (c *Aggregator) Checkpoint(ctx context.Context, _ *metric.Descriptor) {
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c.checkpoint = c.current.SwapNumberAtomic(core.Number(0))
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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, number core.Number, desc *metric.Descriptor) error {
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c.current.AddNumberAtomic(desc.NumberKind(), number)
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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 *metric.Descriptor) error {
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o, _ := oa.(*Aggregator)
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if o == nil {
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return aggregator.NewInconsistentMergeError(c, oa)
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}
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c.checkpoint.AddNumber(desc.NumberKind(), o.checkpoint)
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return nil
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}
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