gitlab.com/aquachain/aquachain@v1.17.16-rc3.0.20221018032414-e3ddf1e1c055/common/log/handler_go14.go (about)

     1  // Copyright 2018 The aquachain Authors
     2  // This file is part of the aquachain library.
     3  //
     4  // The aquachain library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The aquachain library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the aquachain library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  // +build go1.4
    18  
    19  package log
    20  
    21  import "sync/atomic"
    22  
    23  // swapHandler wraps another handler that may be swapped out
    24  // dynamically at runtime in a thread-safe fashion.
    25  type swapHandler struct {
    26  	handler atomic.Value
    27  }
    28  
    29  func (h *swapHandler) Log(r *Record) error {
    30  	return (*h.handler.Load().(*Handler)).Log(r)
    31  }
    32  
    33  func (h *swapHandler) Swap(newHandler Handler) {
    34  	h.handler.Store(&newHandler)
    35  }
    36  
    37  func (h *swapHandler) Get() Handler {
    38  	return *h.handler.Load().(*Handler)
    39  }