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package roadrunner
import (
"os/exec"
"sync"
)
const (
// EventNewPool triggered when server creates new pool.
EventNewPool = 60
// EventDestroyPool triggered when server destroys existed pool.
EventDestroyPool = 61
)
// Service manages pool creation and swapping.
type Server struct {
// configures server, pool, cmd creation and factory.
scfg *ServerConfig
// worker command creator
cmd func() *exec.Cmd
// observes pool events (can be attached to multiple pools at the same time)
observer func(event int, ctx interface{})
// creates and connects to workers
factory Factory
// protects pool while the switch
mu sync.Mutex
}
// todo: do assignment
// Reconfigure configures underlying pool and destroys it's previous version if any.
func (r *Server) Configure(cfg Config) error {
r.mu.Lock()
previous := r.pool
r.mu.Unlock()
pool, err := NewPool(r.cmd, r.factory, cfg)
if err != nil {
return err
}
r.throw(EventNewPool, pool)
r.mu.Lock()
r.cfg, r.pool = cfg, pool
r.pool.Observe(r.poolObserver)
r.mu.Unlock()
if previous != nil {
go func(p Pool) {
r.throw(EventDestroyPool, p)
p.Destroy()
}(previous)
}
return nil
}
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