README
¶
Usage
the singleton pattern is a software design pattern that restricts the instantiation of a type to one object
Example
package main
import (
"github.com/donutloop/toolkit/singleton"
)
type config struct {
Addr string
Port int
}
var configSingleton singleton.NewSingleton = singleton.NewSingleton(func() (interface{}, error) {
return &config{Addr:"localhost", Port:80}, nil
})
func Config() (*config, error) {
s, err := configSingleton.Get()
if err != nil {
return nil, err
}
return s.(*config), nil
}
func main() {
config, err := Config()
// do things
}
Documentation
¶
Index ¶
Examples ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
This section is empty.
Types ¶
type ConstructorFunc ¶
type ConstructorFunc func() (interface{}, error)
type Singleton ¶
type Singleton interface {
Get() (interface{}, error)
Reset()
}
Example ¶
package main
import (
"fmt"
"github.com/donutloop/toolkit/singleton"
)
func main() {
type config struct {
Addr string
Port int
}
configSingleton := singleton.NewSingleton(func() (interface{}, error) {
return &config{Addr: "localhost", Port: 80}, nil
})
configFunc := func() (*config, error) {
s, err := configSingleton.Get()
if err != nil {
return nil, err
}
return s.(*config), nil
}
c, err := configFunc()
if err != nil {
fmt.Printf("error: (%v) \n", err)
}
fmt.Printf("%#v \n", c)
}
Output: &singleton_test.config{Addr:"localhost", Port:80}
func NewSingleton ¶
func NewSingleton(constructor ConstructorFunc) Singleton
Call to create a new singleton that is instantiated with the given constructor function. Constructor is not called until the first call of Get(). If constructor returns a error, it will be called again on the next call of Get().
Source Files
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