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round_robin.go
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round_robin.go
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package pool
import (
"sync"
"github.com/tarantool/go-tarantool/v2"
)
type roundRobinStrategy struct {
conns []*tarantool.Connection
indexByAddr map[string]uint
mutex sync.RWMutex
size uint
current uint
}
func newRoundRobinStrategy(size int) *roundRobinStrategy {
return &roundRobinStrategy{
conns: make([]*tarantool.Connection, 0, size),
indexByAddr: make(map[string]uint),
size: 0,
current: 0,
}
}
func (r *roundRobinStrategy) GetConnByAddr(addr string) *tarantool.Connection {
r.mutex.RLock()
defer r.mutex.RUnlock()
index, found := r.indexByAddr[addr]
if !found {
return nil
}
return r.conns[index]
}
func (r *roundRobinStrategy) DeleteConnByAddr(addr string) *tarantool.Connection {
r.mutex.Lock()
defer r.mutex.Unlock()
if r.size == 0 {
return nil
}
index, found := r.indexByAddr[addr]
if !found {
return nil
}
delete(r.indexByAddr, addr)
conn := r.conns[index]
r.conns = append(r.conns[:index], r.conns[index+1:]...)
r.size -= 1
for k, v := range r.indexByAddr {
if v > index {
r.indexByAddr[k] = v - 1
}
}
return conn
}
func (r *roundRobinStrategy) IsEmpty() bool {
r.mutex.RLock()
defer r.mutex.RUnlock()
return r.size == 0
}
func (r *roundRobinStrategy) GetNextConnection() *tarantool.Connection {
r.mutex.RLock()
defer r.mutex.RUnlock()
if r.size == 0 {
return nil
}
return r.conns[r.nextIndex()]
}
func (r *roundRobinStrategy) GetConnections() []*tarantool.Connection {
r.mutex.RLock()
defer r.mutex.RUnlock()
ret := make([]*tarantool.Connection, len(r.conns))
copy(ret, r.conns)
return ret
}
func (r *roundRobinStrategy) AddConn(addr string, conn *tarantool.Connection) {
r.mutex.Lock()
defer r.mutex.Unlock()
if idx, ok := r.indexByAddr[addr]; ok {
r.conns[idx] = conn
} else {
r.conns = append(r.conns, conn)
r.indexByAddr[addr] = r.size
r.size += 1
}
}
func (r *roundRobinStrategy) nextIndex() uint {
ret := r.current % r.size
r.current++
return ret
}