implemented event and req

pkg/utils/atomic/error.go

@@ -0,0 +1,72 @@
+// @generated Code generated by gen-atomicwrapper.
+
+// Copyright (c) 2020-2023 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 for error values.
+type Error struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v Value
+}
+
+var _zeroError error
+
+// NewError creates a new Error.
+func NewError(val error) *Error {
+	x := &Error{}
+	if val != _zeroError {
+		x.Store(val)
+	}
+	return x
+}
+
+// Load atomically loads the wrapped error.
+func (x *Error) Load() error {
+	return unpackError(x.v.Load())
+}
+
+// Store atomically stores the passed error.
+func (x *Error) Store(val error) {
+	x.v.Store(packError(val))
+}
+
+// CompareAndSwap is an atomic compare-and-swap for error values.
+func (x *Error) CompareAndSwap(old, new error) (swapped bool) {
+	if x.v.CompareAndSwap(packError(old), packError(new)) {
+		return true
+	}
+
+	if old == _zeroError {
+		// If the old value is the empty value, then it's possible the
+		// underlying Value hasn't been set and is nil, so retry with nil.
+		return x.v.CompareAndSwap(nil, packError(new))
+	}
+
+	return false
+}
+
+// Swap atomically stores the given error and returns the old
+// value.
+func (x *Error) Swap(val error) (old error) {
+	return unpackError(x.v.Swap(packError(val)))
+}