mirror of
https://github.com/cgrates/cgrates.git
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114 lines
2.6 KiB
Go
114 lines
2.6 KiB
Go
/*
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Rating system designed to be used in VoIP Carriers Wobld
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Copyright (C) 2012 Radu Ioan Fericean
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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package balancer
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import (
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"log"
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"sync"
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)
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type Balancer struct {
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sync.RWMutex
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clients map[string]Worker
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balancerChannel chan Worker
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}
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type Worker interface {
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Call(serviceMethod string, args interface{}, reply interface{}) error
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Close() error
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}
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/*
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Constructor for RateList holding one slice for addreses and one slice for connections.
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*/
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func NewBalancer() *Balancer {
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r := &Balancer{clients: make(map[string]Worker), balancerChannel: make(chan Worker)} // leaving both slices to nil
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go func() {
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for {
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if len(r.clients) > 0 {
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for _, c := range r.clients {
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r.balancerChannel <- c
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}
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} else {
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r.balancerChannel <- nil
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}
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}
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}()
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return r
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}
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/*
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Adds a client to the two internal slices.
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*/
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func (bl *Balancer) AddClient(address string, client Worker) {
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bl.Lock()
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defer bl.Unlock()
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bl.clients[address] = client
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return
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}
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/*
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Removes a client from the slices locking the readers and reseting the balancer index.
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*/
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func (bl *Balancer) RemoveClient(address string) {
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bl.Lock()
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defer bl.Unlock()
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delete(bl.clients, address)
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<-bl.balancerChannel
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}
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/*
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Returns a client for the specifed address.
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*/
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func (bl *Balancer) GetClient(address string) (c Worker, exists bool) {
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bl.RLock()
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defer bl.RUnlock()
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c, exists = bl.clients[address]
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return
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}
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/*
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Returns the next available connection at each call looping at the end of connections.
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*/
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func (bl *Balancer) Balance() (result Worker) {
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bl.RLock()
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defer bl.RUnlock()
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return <-bl.balancerChannel
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}
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func (bl *Balancer) Shutdown() {
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bl.Lock()
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defer bl.Unlock()
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var reply string
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for address, client := range bl.clients {
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client.Call("Responder.Shutdown", "", &reply)
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log.Printf("Shutdown rater %v: %v ", address, reply)
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}
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}
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func (bl *Balancer) GetClientAddresses() []string {
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bl.RLock()
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defer bl.RUnlock()
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var addresses []string
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for a, _ := range bl.clients {
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addresses = append(addresses, a)
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}
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return addresses
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}
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