Documentation
¶
Overview ¶
Package singleflight provides a duplicate function call suppression mechanism.
Index ¶
Examples ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
This section is empty.
Types ¶
type Group ¶
type Group 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.
Example ¶
g := new(Group)
block := make(chan struct{})
res1c := g.DoChan("key", func() (interface{}, error) {
<-block
return "func 1", nil
})
res2c := g.DoChan("key", func() (interface{}, error) {
<-block
return "func 2", nil
})
close(block)
res1 := <-res1c
res2 := <-res2c
// Results are shared by functions executed with duplicate keys.
fmt.Println("Shared:", res2.Shared)
// Only the first function is executed: it is registered and started with "key",
// and doesn't complete before the second funtion is registered with a duplicate key.
fmt.Println("Equal results:", res1.Val.(string) == res2.Val.(string))
fmt.Println("Result:", res1.Val)
Output: Shared: true Equal results: true Result: func 1
func (*Group) Do ¶
func (g *Group) Do(key string, fn func() (interface{}, error)) (v interface{}, 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.
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