counter

Documentation

Index

• type Aggregator
  • func New() *Aggregator
  • func (c *Aggregator) Checkpoint(ctx context.Context, _ *export.Descriptor)
  • func (c *Aggregator) Merge(oa export.Aggregator, desc *export.Descriptor) error
  • func (c *Aggregator) Sum() (core.Number, error)
  • func (c *Aggregator) Update(_ context.Context, number core.Number, desc *export.Descriptor) error

Types

type Aggregator

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

Aggregator aggregates counter events.

func New

func New() *Aggregator

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

func (*Aggregator) Checkpoint

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

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

func (*Aggregator) Merge

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

Merge combines two counters by adding their sums.

func (*Aggregator) Sum

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

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

func (*Aggregator) Update

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

Update atomically adds to the current value.