55 lines
1.9 KiB
Go
55 lines
1.9 KiB
Go
// Copyright (c) 2016 Uber Technologies, Inc.
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in
|
|
// all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
// THE SOFTWARE.
|
|
|
|
package atomic
|
|
|
|
// Error is an atomic type-safe wrapper around Value for errors
|
|
type Error struct{ v Value }
|
|
|
|
// errorHolder is non-nil holder for error object.
|
|
// atomic.Value panics on saving nil object, so err object needs to be
|
|
// wrapped with valid object first.
|
|
type errorHolder struct{ err error }
|
|
|
|
// NewError creates new atomic error object
|
|
func NewError(err error) *Error {
|
|
e := &Error{}
|
|
if err != nil {
|
|
e.Store(err)
|
|
}
|
|
return e
|
|
}
|
|
|
|
// Load atomically loads the wrapped error
|
|
func (e *Error) Load() error {
|
|
v := e.v.Load()
|
|
if v == nil {
|
|
return nil
|
|
}
|
|
|
|
eh := v.(errorHolder)
|
|
return eh.err
|
|
}
|
|
|
|
// Store atomically stores error.
|
|
// NOTE: a holder object is allocated on each Store call.
|
|
func (e *Error) Store(err error) {
|
|
e.v.Store(errorHolder{err: err})
|
|
}
|