Package singleflight provides a duplicate function call suppression mechanism.



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    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.

      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.

          The returned channel will not be closed.

          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

            type Result struct {
            	Val    interface{}
            	Err    error
            	Shared bool

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

              Source Files