ActiveGo 1.8Package singleflight
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type Group ¶
Group represents a class of work and forms a namespace in which units of work can be executed with duplicate suppression.
type Group struct {
// contains filtered or unexported fields
}
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.
func (*Group) DoChan ¶
func (g *Group) DoChan(key string, fn func() (interface{}, error)) <-chan Result
DoChan is like Do but returns a channel that will receive the results when they are ready.
func (*Group) Forget ¶
func (g *Group) Forget(key string)
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 ¶
Result holds the results of Do, so they can be passed on a channel.
type Result struct {
Val interface{}
Err error
Shared bool
}