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Package once

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Published: Jun 24, 2020 | License: Apache-2.0 | Module:


Package once contains utilities for managing actions that must be performed exactly once.


Package Files

type Map

type Map sync.Map

Map coordinates actions that must happen exactly once, keyed by user-defined keys.

func (*Map) Do

func (m *Map) Do(key interface{}, do func() error) error

Perform the provided action named by a key. Do invokes the action exactly once for each key, and returns any errors produced by the provided action.

func (*Map) Forget

func (m *Map) Forget(key interface{})

Forget forgets past computations associated with the provided key.

type Task

type Task struct {
	// contains filtered or unexported fields

Task manages a computation that must be run at most once. It's similar to sync.Once, except it also handles and returns errors.

func (*Task) Do

func (o *Task) Do(do func() error) error

Do run the function do at most once. Successive invocations of Do guarantee exactly one invocation of the function do. Do returns the error of do's invocation.

Documentation was rendered with GOOS=linux and GOARCH=amd64.

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