// Copyright Fuzamei Corp. 2018 All Rights Reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build go1.4

package log15

import "sync/atomic"

// swapHandler wraps another handler that may be swapped out
// dynamically at runtime in a thread-safe fashion.
type swapHandler struct {
	handler atomic.Value
}

func (h *swapHandler) Log(r *Record) error {
	return (*h.handler.Load().(*Handler)).Log(r)
}

func (h *swapHandler) MaxLevel() int {
	return (*h.handler.Load().(*Handler)).MaxLevel()
}

func (h *swapHandler) SetMaxLevel(maxLevel int) {
	(*h.handler.Load().(*Handler)).SetMaxLevel(maxLevel)
}

func (h *swapHandler) Swap(newHandler Handler) {
	h.handler.Store(&newHandler)
}

func (h *swapHandler) Get() Handler {
	return *h.handler.Load().(*Handler)
}