### Install Agollo Go Client

Source: https://github.com/apolloconfig/agollo/blob/master/README.md

Use 'go get' to install the latest version of the agollo client. Ensure you are using the v5 tag for the latest stable release.

```bash
go get -u github.com/apolloconfig/agollo/v5@latest
```

--------------------------------

### Start Agollo Client

Source: https://github.com/apolloconfig/agollo/wiki/获取默认配置

Initializes the Agollo client. This is the first step before making any configuration requests.

```golang
client,err:=agollo.Start()
```

--------------------------------

### Start Agollo Client

Source: https://github.com/apolloconfig/agollo/wiki/获取默认配置

Initializes the Agollo client. This is the first step before making any configuration requests.

```APIDOC
## Start Agollo Client

### Description
Initializes the Agollo client. This is the first step before making any configuration requests.

### Method Signature
```golang
client, err := agollo.Start()
```

### Parameters
None explicitly documented.

### Returns
- `client`: An initialized Agollo client instance.
- `err`: An error object if initialization fails.
```

--------------------------------

### Get String Value

Source: https://github.com/apolloconfig/agollo/wiki/获取默认配置

Retrieves a configuration value as a string.

```APIDOC
## Get String Value

### Description
Retrieves a configuration value associated with the given key as a string. If the key is not found, the default value is returned.

### Method Signature
```golang
client.GetStringValue(key string, defaultValue string) string
```

### Parameters
- **key** (string): The configuration key to retrieve.
- **defaultValue** (string): The value to return if the key is not found.

### Returns
- (string): The configuration value or the default value.
```

--------------------------------

### Get Int Value

Source: https://github.com/apolloconfig/agollo/wiki/获取默认配置

Retrieves a configuration value as an integer.

```APIDOC
## Get Int Value

### Description
Retrieves a configuration value associated with the given key as an integer. If the key is not found or cannot be converted to an integer, the default value is returned.

### Method Signature
```golang
client.GetIntValue(key string, defaultValue int) int
```

### Parameters
- **key** (string): The configuration key to retrieve.
- **defaultValue** (int): The value to return if the key is not found or is not a valid integer.

### Returns
- (int): The configuration value as an integer or the default value.
```

--------------------------------

### Use Custom Cache Component with agollo in Go

Source: https://github.com/apolloconfig/agollo/wiki/自定义缓存组件

Demonstrates how to set a custom cache factory and start the agollo client. Ensure the custom cache factory implements the CacheInterface.

```go
agollo.SetCache(&DefaultCacheFactory{})
client,e:=agollo.Start()
```

--------------------------------

### Get Float Value

Source: https://github.com/apolloconfig/agollo/wiki/获取默认配置

Retrieves a configuration value as a float.

```APIDOC
## Get Float Value

### Description
Retrieves a configuration value associated with the given key as a float. If the key is not found or cannot be converted to a float, the default value is returned.

### Method Signature
```golang
client.GetFloatValue(key string, defaultValue float64) float64
```

### Parameters
- **key** (string): The configuration key to retrieve.
- **defaultValue** (float64): The value to return if the key is not found or is not a valid float.

### Returns
- (float64): The configuration value as a float or the default value.
```

--------------------------------

### Get Bool Value

Source: https://github.com/apolloconfig/agollo/wiki/获取默认配置

Retrieves a configuration value as a boolean.

```APIDOC
## Get Bool Value

### Description
Retrieves a configuration value associated with the given key as a boolean. If the key is not found or cannot be converted to a boolean, the default value is returned.

### Method Signature
```golang
client.GetBoolValue(key string, defaultValue bool) bool
```

### Parameters
- **key** (string): The configuration key to retrieve.
- **defaultValue** (bool): The value to return if the key is not found or is not a valid boolean.

### Returns
- (bool): The configuration value as a boolean or the default value.
```

--------------------------------

### Get String Value

Source: https://github.com/apolloconfig/agollo/wiki/获取默认配置

Retrieves a string configuration value by its key. If the key is not found, the provided default value is returned.

```golang
client.GetStringValue(Key,DefaultValue)
```

--------------------------------

### Get Bool Value

Source: https://github.com/apolloconfig/agollo/wiki/获取默认配置

Retrieves a boolean configuration value by its key. If the key is not found, the provided default value is returned.

```golang
client.GetBoolValue(Key,DefaultValue)
```

--------------------------------

### Get Int Value

Source: https://github.com/apolloconfig/agollo/wiki/获取默认配置

Retrieves an integer configuration value by its key. If the key is not found, the provided default value is returned.

```golang
client.GetIntValue(Key,DefaultValue)
```

--------------------------------

### Get Float Value

Source: https://github.com/apolloconfig/agollo/wiki/获取默认配置

Retrieves a float configuration value by its key. If the key is not found, the provided default value is returned.

```golang
client.GetFloatValue(Key,DefaultValue)
```

--------------------------------

### Declare Default Cache Component in Go

Source: https://github.com/apolloconfig/agollo/wiki/自定义缓存组件

Defines the DefaultCache struct and its methods (Set, EntryCount, Get, Range, Del, Clear) implementing the CacheInterface. It uses a sync.Map for thread-safe in-memory caching. This is suitable for simple, in-memory caching needs.

```go
//DefaultCache 默认缓存
type DefaultCache struct {
	defaultCache sync.Map
}

//Set 获取缓存
func (d *DefaultCache)Set(key string, value []byte, expireSeconds int) (err error)  {
	d.defaultCache.Store(key,value)
	return nil
}

//EntryCount 获取实体数量
func (d *DefaultCache)EntryCount() (entryCount int64){
	count:=int64(0)
	d.defaultCache.Range(func(key, value interface{}) bool {
		count++
		return true
	})
	return count
}

//Get 获取缓存
func (d *DefaultCache)Get(key string) (value []byte, err error){
	v, ok := d.defaultCache.Load(key)
	if !ok{
		return nil,errors.New("load default cache fail")
	}
	return v.([]byte),nil
}

//Range 遍历缓存
func (d *DefaultCache)Range(f func(key, value interface{}) bool){
	d.defaultCache.Range(f)
}

//Del 删除缓存
func (d *DefaultCache)Del(key string) (affected bool) {
	d.defaultCache.Delete(key)
	return true
}

//Clear 清除所有缓存
func (d *DefaultCache)Clear() {
	d.defaultCache=sync.Map{}
}

//DefaultCacheFactory 构造默认缓存组件工厂类
type DefaultCacheFactory struct {

}

//Create 创建默认缓存组件
func (d *DefaultCacheFactory) Create()CacheInterface {
	return &DefaultCache{}
}
```

--------------------------------

### Initialize Agollo Client with Configuration

Source: https://github.com/apolloconfig/agollo/blob/master/README.md

Initialize the Agollo client by providing application configuration details. This includes AppID, cluster, server IP, namespace, and an optional secret for authentication. The client can then be used to retrieve configurations.

```go
package main

import (
	"fmt"

	"github.com/apolloconfig/agollo/v5"
	"github.com/apolloconfig/agollo/v5/env/config"
)

func main() {
	c := &config.AppConfig{
		AppID:          "testApplication_yang",
		Cluster:        "dev",
		IP:             "http://localhost:8080",
		NamespaceName:  "dubbo",
		IsBackupConfig: true,
		Secret:         "6ce3ff7e96a24335a9634fe9abca6d51",
	}

	client, _ := agollo.StartWithConfig(func() (*config.AppConfig, error) {
		return c, nil
	})
	fmt.Println("Apollo configuration initialized successfully")

	//Use your apollo key to test
	cache := client.GetConfigCache(c.NamespaceName)
	value, _ := cache.Get("key")
	fmt.Println(value)
}
```

--------------------------------

### 启动 Agollo - 自定义Logger控件

Source: https://github.com/apolloconfig/agollo/wiki/启动方式

允许开发者设置自定义的日志记录器，以满足特定的日志处理需求。全局agollo会共用同一个日志实例。

```go
func main() {
	 agollo.SetLogger(&DefaultLogger{loggerInterface})
}
```

--------------------------------

### 启动 Agollo - 自定义各种控件 (v1.8.0+)

Source: https://github.com/apolloconfig/agollo/wiki/启动方式

允许开发者在v1.8.0及以上版本中同时自定义缓存和日志控件，以实现更灵活的配置加载和管理。此方式会先设置自定义控件，然后启动客户端。

```go
func main() {
    agollo.SetCache(&DefaultCacheFactory{})
	agollo.SetLogger(&DefaultLogger{})
	client, err := agollo.Start()
}
```

--------------------------------

### 启动 Agollo - 自定义Cache控件 (v1.7.0+)

Source: https://github.com/apolloconfig/agollo/wiki/启动方式

允许开发者设置自定义的缓存实现，以满足特定的缓存策略或存储需求。此功能自v1.7.0版本起可用。

```go
func main() {
	 agollo.SetCache(&DefaultCacheFactory{})
}
```

--------------------------------

### Format Go Code with go fmt

Source: https://github.com/apolloconfig/agollo/blob/master/CONTRIBUTING.md

Use `go fmt` to format your Go code before committing. This ensures consistent code style across the project. For IDEs like IntelliJ, file watching can automate this process.

```bash
go fmt ./...
```

--------------------------------

### 启动 Agollo 客户端

Source: https://github.com/apolloconfig/agollo/wiki/启动方式

用于初始化程序并加载Apollo配置，启动后会异步更新本地配置。适用于初始化程序基础配置的场景。

```go
func main() {
	 client, err := agollo.Start()
}
```

--------------------------------

### 监听配置变更事件

Source: https://github.com/apolloconfig/agollo/wiki/启动方式

演示如何启动agollo客户端并添加自定义的配置变更监听器。当Apollo中的配置发生变化时，监听器会被触发。

```go
func main() {
	c2 := &CustomChangeListener{}

	client,err:=agollo.Start()
	client.AddChangeListener(c2)
}
```

--------------------------------

### Implementing a Custom Change Listener in Go

Source: https://github.com/apolloconfig/agollo/wiki/监听变更事件

Define a struct that implements the OnChange method to process configuration updates. This is useful for custom logic when configuration changes.

```go
type CustomChangeListener struct {
	
}

func (c *CustomChangeListener) OnChange(changeEvent *agollo.ChangeEvent) {
   //write your code here
}

func main(){
   client,err:=agollo.Start()
	client.AddChangeListener(c2)
}
```

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