// NewResourcePool use to create pool for resource
func NewResourcePool(address string, factory GroupFactory, initNum, maxCap int, idleTimeout time.Duration, circuitBreaker *circuit.CircuitBreaker) *ResourcePool {
if maxCap <= 0 {
panic(errors.New("invalid of max capacity"))
}
var (
resourcePool *ResourcePool
err error
)
resourcePool = &ResourcePool{
factory: factory,
resources: make(chan resourceWrapper, maxCap),
idleTimeout: idleTimeout,
}
for i := 0; i < initNum; i++ {
var res Resource
res, err = factory()
if err != nil {
continue
}
log.Infof(nil, "Init resource %v", res)
resourcePool.resources <- resourceWrapper{res, time.Now()}
}
resourcePool.address = address
resourcePool.circuitBreaker = circuitBreaker
return resourcePool
}
// enqueue is used to do real enqueue op
func (r *ResourcePool) enqueue(ctx context.Context, res Resource) {
if r.address != res.Address() {
log.Errorf(ctx, "FATAL: Conn %s back to wrong pool %s\n", r.address, res.Address())
}
start := time.Now()
log.Infof(ctx, "Start enqueue, address: %s, av-size: %d\n", res.Address(), len(r.resources))
select {
case r.resources <- resourceWrapper{res, time.Now()}:
log.Infof(ctx, "Put resource back, address: %s, av-size: %d, waste-time: %d\n", res.Address(), len(r.resources), time.Now().Sub(start).Nanoseconds())
return
default:
log.Warningf(ctx, "Put resource back failure, because full close it, address: %s, waste-time: %d\n", res.Address(), len(r.resources))
r.closeConn(ctx, res)
}
}
// Get resource from pool
func (r *ResourcePool) get(ctx context.Context, wait bool) (Resource, error) {
select {
case <-ctx.Done():
return nil, ErrTimeout
default:
}
var (
wrapper resourceWrapper
err error
)
start := time.Now()
for {
select {
case wrapper = <-r.resources:
if time.Now().Sub(wrapper.timeUsed) >= r.idleTimeout {
log.Warningf(ctx, "Get idle timeout resource, address: %s, av-size: %d, waste-time: %d\n", wrapper.resource.Address(), len(r.resources), time.Now().Sub(start).Nanoseconds())
r.closeConn(ctx, wrapper.resource)
continue
}
log.Infof(ctx, "Get resouce from pool success, address: %v, av-size: %d, waste-time: %d\n", wrapper.resource.Address(), len(r.resources), time.Now().Sub(start).Nanoseconds())
return wrapper.resource, nil
default:
log.Warningf(ctx, "Have not enough resource in pool, start create resource, address: %s, av-size: %d\n", r.address, len(r.resources))
var res Resource
if res, err = r.factory(); err != nil {
log.Errorf(ctx, "create resource failure, error: %v", err)
return nil, err
}
log.Infof(ctx, "Create new resource successed, address: %s", res.Address())
r.enqueue(ctx, res)
log.Infof(ctx, "New resource back to queue sucessed, address: %s, av-size: %d", res.Address(), len(r.resources))
continue
}
}
}
func (r *ResourcePool) closeConn(ctx context.Context, resource Resource) {
if resource == nil {
return
}
err := resource.RawClose()
if err != nil {
log.Errorf(ctx, "Close connection but failured, address: %s", r.address)
}
log.Infof(ctx, "Close resource: %s", resource.Address())
}
// Get is used to get resource form group pool
func (p *Group) Get(ctx context.Context) (Resource, error) {
pool, _, err := p.selectPool(ctx)
if err == nil {
return nil, err
}
res, err := pool.Get(ctx)
if err != nil {
log.Errorf(ctx, "Select pool failure, error: %v", err)
return nil, err
}
log.Infof(ctx, "Selected pool %s with %d\n", res.Address())
return res, nil
}