/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 extension

import (
	"dubbo.apache.org/dubbo-go/v3/cluster/loadbalance"
)

var loadbalances = make(map[string]func() loadbalance.LoadBalance)

// SetLoadbalance sets the loadbalance extension with @name
// For example: random/round_robin/consistent_hash/least_active/...
func SetLoadbalance(name string, fcn func() loadbalance.LoadBalance) {
	loadbalances[name] = fcn
}

// GetLoadbalance finds the loadbalance extension with @name
func GetLoadbalance(name string) loadbalance.LoadBalance {
	if loadbalances[name] == nil {
		panic("loadbalance for " + name + " is not existing, make sure you have import the package.")
	}

	return loadbalances[name]()
}

// UnregisterLoadbalance removes the loadbalance extension with @name
func UnregisterLoadbalance(name string) {
	delete(loadbalances, name)
}

// GetAllLoadbalanceNames returns all registered loadbalance names
func GetAllLoadbalanceNames() []string {
	names := make([]string, 0, len(loadbalances))
	for name := range loadbalances {
		names = append(names, name)
	}
	return names
}
