counter

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v0.2.3 Latest Latest Go to latest Published: Mar 4, 2020 License: Apache-2.0 Imports: 4 Imported by: 0

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type Aggregator struct {
	// contains filtered or unexported fields
}

Aggregator aggregates counter events.

func New() *Aggregator

New returns a new counter aggregator implemented by atomic operations. This aggregator implements the aggregator.Sum export interface.

func (c *Aggregator) Checkpoint(ctx context.Context, _ *export.Descriptor)

Checkpoint atomically saves the current value and resets the current sum to zero.

func (c *Aggregator) Merge(oa export.Aggregator, desc *export.Descriptor) error

Merge combines two counters by adding their sums.

func (c *Aggregator) Sum() (core.Number, error)

Sum returns the last-checkpointed sum. This will never return an error.

func (c *Aggregator) Update(_ context.Context, number core.Number, desc *export.Descriptor) error

Update atomically adds to the current value.