gitee.com/go-spring2/spring-base@v1.1.3/atomic/value.go (about)

     1  /*
     2   * Copyright 2012-2019 the original author or authors.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *      https://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package atomic
    18  
    19  import (
    20  	"sync/atomic"
    21  )
    22  
    23  type MarshalValue func(interface{}) ([]byte, error)
    24  
    25  // A Value provides an atomic load and store of a consistently typed value.
    26  type Value struct {
    27  	_ nocopy
    28  	atomic.Value
    29  
    30  	marshalJSON MarshalValue
    31  }
    32  
    33  // SetMarshalJSON sets the JSON encoding handler for x.
    34  func (x *Value) SetMarshalJSON(fn MarshalValue) {
    35  	x.marshalJSON = fn
    36  }
    37  
    38  // MarshalJSON returns the JSON encoding of x.
    39  func (x *Value) MarshalJSON() ([]byte, error) {
    40  	return x.marshalJSON(x.Load())
    41  }