1// +build !go1.4
2
3package log15
4
5import (
6	"sync/atomic"
7	"unsafe"
8)
9
10// swapHandler wraps another handler that may be swapped out
11// dynamically at runtime in a thread-safe fashion.
12type swapHandler struct {
13	handler unsafe.Pointer
14}
15
16func (h *swapHandler) Log(r *Record) error {
17	return h.Get().Log(r)
18}
19
20func (h *swapHandler) Get() Handler {
21	return *(*Handler)(atomic.LoadPointer(&h.handler))
22}
23
24func (h *swapHandler) Swap(newHandler Handler) {
25	atomic.StorePointer(&h.handler, unsafe.Pointer(&newHandler))
26}
27