github.com/e154/smart-home@v0.17.2-0.20240311175135-e530a6e5cd45/common/debounce/debounce.go (about)

     1  // This file is part of the Smart Home
     2  // Program complex distribution https://github.com/e154/smart-home
     3  // Copyright (C) 2023, Filippov Alex
     4  //
     5  // This library is free software: you can redistribute it and/or
     6  // modify it under the terms of the GNU Lesser General Public
     7  // License as published by the Free Software Foundation; either
     8  // version 3 of the License, or (at your option) any later version.
     9  //
    10  // This library is distributed in the hope that it will be useful,
    11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13  // Library General Public License for more details.
    14  //
    15  // You should have received a copy of the GNU Lesser General Public
    16  // License along with this library.  If not, see
    17  // <https://www.gnu.org/licenses/>.
    18  
    19  package debounce
    20  
    21  import (
    22  	"sync"
    23  	"time"
    24  )
    25  
    26  func New(after time.Duration) func(f func()) {
    27  	d := &Debounce{after: after}
    28  
    29  	return func(f func()) {
    30  		d.add(f)
    31  	}
    32  }
    33  
    34  type Debounce struct {
    35  	sync.Mutex
    36  	after time.Duration
    37  	timer *time.Timer
    38  }
    39  
    40  func (d *Debounce) add(f func()) {
    41  	d.Lock()
    42  	defer d.Unlock()
    43  
    44  	if d.timer != nil {
    45  		d.timer.Stop()
    46  	}
    47  	d.timer = time.AfterFunc(d.after, f)
    48  }