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// Copyright 2017 The go-hep Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package fwk
import (
// FactoryFunc creates a Component of type t and name n, managed by the fwk.App mgr.
type FactoryFunc func(t, n string, mgr App) (Component, error)
// factoryDb associates a fully-qualified type-name (pkg-path + type-name) with
// a component factory-function.
type factoryDb map[string]FactoryFunc
var gFactory = make(factoryDb)
// Register registers a type t with the FactoryFunc fct.
// fwk.ComponentMgr will then be able to create new values of that type t
// using the associated FactoryFunc fct.
// If a type t was already registered, the previous FactoryFunc value will be
// silently overridden with the new FactoryFunc value.
func Register(t reflect.Type, fct FactoryFunc) {
comp := t.PkgPath() + "." + t.Name()
gFactory[comp] = fct
//fmt.Printf("### factories ###\n%v\n", gFactory)
// Registry returns the list of all registered and known components.
func Registry() []string {
comps := make([]string, 0, len(gFactory))
for k := range gFactory {
comps = append(comps, k)
return comps
// New creates a new Component value with type t and name n.
func (app *appmgr) New(t, n string) (Component, error) {
var err error
fct, ok := gFactory[t]
if !ok {
return nil, Errorf("no component with type [%s] registered", t)
if _, dup := app.props[n]; dup {
return nil, Errorf("component with name [%s] already created", n)
app.props[n] = make(map[string]interface{})
c, err := fct(t, n, app)
if err != nil {
return nil, Errorf("error creating [%s:%s] %v", t, n, err)
if c.Name() == "" {
return nil, Errorf("factory for [%s] does NOT set the name of the component", t)
err = app.addComponent(c)
if err != nil {
return nil, err
switch c := c.(type) {
case Svc:
err = app.AddSvc(c)
if err != nil {
return nil, err
case Task:
err = app.AddTask(c)
if err != nil {
return nil, err
return c, err