| // +build !go1.4 | |
| package log15 | |
| import ( | |
| "sync/atomic" | |
| "unsafe" | |
| ) | |
| // swapHandler wraps another handler that may be swapped out | |
| // dynamically at runtime in a thread-safe fashion. | |
| type swapHandler struct { | |
| handler unsafe.Pointer | |
| } | |
| func (h *swapHandler) Log(r *Record) error { | |
| return h.Get().Log(r) | |
| } | |
| func (h *swapHandler) Get() Handler { | |
| return *(*Handler)(atomic.LoadPointer(&h.handler)) | |
| } | |
| func (h *swapHandler) Swap(newHandler Handler) { | |
| atomic.StorePointer(&h.handler, unsafe.Pointer(&newHandler)) | |
| } |