/*
   Copyright 2020 XiaochengTech

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

package connections

import (
	"fmt"
	"sync"
)

// 生成Listener的参数
type NewListenerParams struct {
	TcpAddr     string      // TCP监听地址，为空表示不启用
	UdpAddr     string      // UDP监听地址，为空表示不启用
	PoolKeyFunc PoolKeyFunc // 连接池键的生成函数
}

// 新建Listener实例
func NewListener(params NewListenerParams) (instance *Listener) {
	instance = &Listener{
		closed:      false,
		tcpListener: nil,
		udpListener: nil,
		pool:        make(map[string]Connection),
		poolLock:    sync.RWMutex{},
	}
	if params.PoolKeyFunc != nil {
		instance.poolKeyFunc = params.PoolKeyFunc
	} else {
		instance.poolKeyFunc = DefaultPoolKeyFunc
	}
	return
}

// 默认的连接池键的生成函数
func DefaultPoolKeyFunc(
	transport string,
	address string,
) string {
	return fmt.Sprintf("%s-%s", transport, address)
}