singleflight

package
v0.3.4 Latest Latest
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 Go to latest Published: Mar 11, 2024 License: MIT Imports: 6 Imported by: 0

Documentation

Overview

Package singleflight provides a duplicate function call suppression mechanism.

Index

Constants

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Variables

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Functions

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Types

type Group 

type Group[K comparable, V any] struct {
	// contains filtered or unexported fields
}

Group represents a class of work and forms a namespace in which units of work can be executed with duplicate suppression.

func (*Group[K, V]) Do 

func (g *Group[K, V]) Do(key K, fn func() (V, error)) (v V, err error, shared bool)

Do executes and returns the results of the given function, making sure that only one execution is in-flight for a given key at a time. If a duplicate comes in, the duplicate caller waits for the original to complete and receives the same results. The return value shared indicates whether v was given to multiple callers.

func (*Group[K, V]) DoChan 

func (g *Group[K, V]) DoChan(key K, fn func() (V, error)) <-chan Result[V]

DoChan is like Do but returns a channel that will receive the results when they are ready.

The returned channel will not be closed.

func (*Group[K, V]) Forget 

func (g *Group[K, V]) Forget(key K)

Forget tells the singleflight to forget about a key. Future calls to Do for this key will call the function rather than waiting for an earlier call to complete.

type Result 

type Result[T any] struct {
	Val    T
	Err    error
	Shared bool
}

Result holds the results of Do, so they can be passed on a channel.

Source Files

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