包地址：http://golang.org/pkg/expvar/
Package expvar provides a standardized interface to public variables, such as operation counters in servers. It exposes these variables via HTTP at /debug/vars in JSON format.
Operations to set or modify these public variables are atomic.
In addition to adding the HTTP handler, this package registers the following variables:
expvar包给 公开变量提供一个统一的接口,如在服务器上运行的计数器。 通过HTTP在JSON格式里 /debug/vars 暴露这些变量
设置或修改公开变量具有原子性 除了增加HTTP处理程序,这个包注册以下的变量:
cmdline os.Args
memstats runtime.MemstatsThe package is sometimes only imported for the side effect of registering its HTTP handler and the above variables. To use it this way, link this package into your program: 包有时候只导入 注册HTTP处理 和上述的变量 在这种情况下,可以这样在你的程序里引入包:
import _ "expvar"func Do
func Do(f func(KeyValue))
Do calls f for each exported variable. The global variable map is locked during the iteration, but existing entries may be concurrently updated.
给每个导出变量调用f.全局变量 映射 在迭代的区间是锁的,但是现有的项目可以同时更新func Publish
func Publish(name string, v Var)
Publish declares a named exported variable. This should be called from a package's init function when it creates its Vars.
If the name is already registered then this will log.Panic.
Publish声明一个可导出变量的名称. 当它创建它的Vars,应该在包的init函数调用
如果name 已经被注册存在,会产生 log.Panic.type Float
type Float struct {
// contains filtered or unexported fields
}
Float is a 64-bit float variable that satisfies the Var interface.
是一个 满足Var 接口的 64位的浮点型变量 func NewFloat ``golang func NewFloat(name string) *Float
func (*Float) Add
``golang
func (v *Float) Add(delta float64)
Add adds delta to v.
把delta累加到v
func (*Float) Set ``golang func (v *Float) Set(value float64) Set sets v to value. 把v设置成value
func (*Float) String
```golang
func (v *Float) String() string
type Func
type Func func() interface{}
Func implements Var by calling the function and formatting the returned value using JSON.
使用JSON 调用和格式化返回值 来 实现Varfunc (Func) String
func (f Func) String() stringtype Int
type Int struct {
// contains filtered or unexported fields
}
Int is a 64-bit integer variable that satisfies the Var interface.
Int是 实现Var 接口的64位 整型func NewInt
func NewInt(name string) *Intfunc (*Int) Add
func (v *Int) Add(delta int64)func (*Int) Set
func (v *Int) Set(value int64)func (*Int) String
func (v *Int) String() stringtype KeyValue
type KeyValue struct {
Key string
Value Var
}
KeyValue represents a single entry in a Map.
表示map里的单个实体type Map
type Map struct {
// contains filtered or unexported fields
}
Map is a string-to-Var map variable that satisfies the Var interface.
map是一个满足 Var接口的 字符串到 Var 映射的变量func NewMap
func NewMap(name string) *Mapfunc (*Map) Add
func (v *Map) Add(key string, delta int64)func (*Map) AddFloat
func (v *Map) AddFloat(key string, delta float64)
AddFloat adds delta to the *Float value stored under the given map key.
添加delta到*Float 值, 存储在给定的map值func (*Map) Do
func (v *Map) Do(f func(KeyValue))
Do calls f for each entry in the map. The map is locked during the iteration, but existing entries may be concurrently updated.
给map里的每个实体调用f. 迭代过程中 map是锁的.但是存在的项目也会同时更新func (*Map) Get
func (v *Map) Get(key string) Varfunc (*Map) Init
func (v *Map) Init() *Mapfunc (*Map) Set
func (v *Map) Set(key string, av Var)func (*Map) String
func (v *Map) String() stringtype String
type String struct {
// contains filtered or unexported fields
}
String is a string variable, and satisfies the Var interface.
是一个满足Var接口的字符串变量func NewString
func NewString(name string) *Stringfunc (*String) Set
func (v *String) Set(value string)func (*String) String
func (v *String) String() stringtype Var
type Var interface {
String() string
}
Var is an abstract type for all exported variables.
Var是所有可导出变量的抽象类型func Get
func Get(name string) Var
Get retrieves a named exported variable.
在导出的变量中检索一个 名字