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oncefunc.go (871B)

      1 /*
      2  *
      3  * Copyright 2022 gRPC authors.
      4  *
      5  * Licensed under the Apache License, Version 2.0 (the "License");
      6  * you may not use this file except in compliance with the License.
      7  * You may obtain a copy of the License at
      8  *
      9  *     http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  * Unless required by applicable law or agreed to in writing, software
     12  * distributed under the License is distributed on an "AS IS" BASIS,
     13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  * See the License for the specific language governing permissions and
     15  * limitations under the License.
     16  *
     17  */
     18 
     19 package grpcsync
     20 
     21 import (
     22 	"sync"
     23 )
     24 
     25 // OnceFunc returns a function wrapping f which ensures f is only executed
     26 // once even if the returned function is executed multiple times.
     27 func OnceFunc(f func()) func() {
     28 	var once sync.Once
     29 	return func() {
     30 		once.Do(f)
     31 	}
     32 }