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registry.go
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registry.go
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package peas
import (
"errors"
"github.com/procyon-projects/goo"
"sync"
)
const defaultSharedObjectsMapSize = 0
type SharedPeaRegistry interface {
RegisterSharedPea(peaName string, sharedObject interface{}) error
GetSharedPea(peaName string) interface{}
ContainsSharedPea(peaName string) bool
GetSharedPeaNames() []string
GetSharedPeaCount() int
GetSharedPeaType(requiredType goo.Type) interface{}
GetSharedPeasByType(requiredType goo.Type) []interface{}
GetSharedPeaWithObjectFunc(peaName string, objFunc GetObjectFunc) (interface{}, error)
}
type DefaultSharedPeaRegistry struct {
sharedObjects map[string]interface{}
sharedObjectsInPreparation map[string]interface{}
sharedObjectsType map[string]goo.Type
muSharedObjects sync.RWMutex
}
func NewDefaultSharedPeaRegistry() *DefaultSharedPeaRegistry {
return &DefaultSharedPeaRegistry{
sharedObjects: make(map[string]interface{}, defaultSharedObjectsMapSize),
sharedObjectsInPreparation: make(map[string]interface{}, defaultSharedObjectsMapSize),
sharedObjectsType: make(map[string]goo.Type, defaultSharedObjectsMapSize),
muSharedObjects: sync.RWMutex{},
}
}
func (registry *DefaultSharedPeaRegistry) RegisterSharedPea(peaName string, sharedObject interface{}) error {
if peaName == "" || sharedObject == nil {
return errors.New("pea name or shared object must not be null or empty")
}
sharedObjectType := goo.GetType(sharedObject)
if !sharedObjectType.IsInterface() && !sharedObjectType.IsStruct() {
return errors.New("pea object must be only instance of struct")
}
registry.muSharedObjects.Lock()
if _, ok := registry.sharedObjects[peaName]; ok {
registry.muSharedObjects.Unlock()
return errors.New("could not register shared object with same name")
}
registry.sharedObjects[peaName] = sharedObject
registry.muSharedObjects.Unlock()
registry.addInstanceSharedObjectsType(peaName, sharedObjectType)
return nil
}
func (registry *DefaultSharedPeaRegistry) GetSharedPea(peaName string) interface{} {
defer func() {
registry.muSharedObjects.Unlock()
}()
var result interface{}
registry.muSharedObjects.Lock()
if sharedObj, ok := registry.sharedObjects[peaName]; ok {
result = sharedObj
}
return result
}
func (registry *DefaultSharedPeaRegistry) ContainsSharedPea(peaName string) bool {
defer func() {
registry.muSharedObjects.Unlock()
}()
registry.muSharedObjects.Lock()
if _, ok := registry.sharedObjects[peaName]; ok {
return true
}
return false
}
func (registry *DefaultSharedPeaRegistry) GetSharedPeaNames() []string {
defer func() {
registry.muSharedObjects.Unlock()
}()
registry.muSharedObjects.Lock()
names := getStringMapKeys(registry.sharedObjects)
return names
}
func (registry *DefaultSharedPeaRegistry) GetSharedPeaCount() int {
defer func() {
registry.muSharedObjects.Unlock()
}()
registry.muSharedObjects.Lock()
objectLength := len(registry.sharedObjects)
return objectLength
}
func (registry *DefaultSharedPeaRegistry) GetSharedPeaType(requiredType goo.Type) interface{} {
instances := registry.GetSharedPeasByType(requiredType)
if len(instances) > 1 {
panic("Instances of required type cannot be distinguished")
} else if len(instances) == 0 {
return nil
}
return instances[0]
}
func (registry *DefaultSharedPeaRegistry) GetSharedPeasByType(requiredType goo.Type) []interface{} {
if requiredType == nil {
panic("Required type must not be nil")
}
defer func() {
registry.muSharedObjects.Unlock()
}()
instances := make([]interface{}, 0)
registry.muSharedObjects.Lock()
for peaName, peaType := range registry.sharedObjectsType {
match := false
if peaType.Equals(requiredType) {
match = true
} else if requiredType.IsInterface() && peaType.ToStructType().Implements(requiredType.ToInterfaceType()) {
match = true
} else if requiredType.IsStruct() && peaType.ToStructType().EmbeddedStruct(requiredType.ToStructType()) {
match = true
}
if match {
instances = append(instances, registry.sharedObjects[peaName])
}
}
return instances
}
func (registry *DefaultSharedPeaRegistry) GetSharedPeaWithObjectFunc(peaName string, objFunc GetObjectFunc) (interface{}, error) {
sharedPea := registry.GetSharedPea(peaName)
if sharedPea != nil {
return sharedPea, nil
}
err := registry.addSharedPeaToPreparation(peaName)
if err != nil {
return nil, err
}
defer func() {
registry.removedSharedPeaFromPreparation(peaName)
}()
var newSharedObj interface{}
newSharedObj, err = objFunc()
registry.removedSharedPeaFromPreparation(peaName)
return newSharedObj, err
}
func (registry *DefaultSharedPeaRegistry) addSharedPeaToPreparation(peaName string) error {
defer func() {
registry.muSharedObjects.Unlock()
}()
registry.muSharedObjects.Lock()
if _, ok := registry.sharedObjectsInPreparation[peaName]; ok {
return NewPeaInPreparationError(peaName)
}
registry.sharedObjectsInPreparation[peaName] = nil
return nil
}
func (registry *DefaultSharedPeaRegistry) removedSharedPeaFromPreparation(peaName string) {
registry.muSharedObjects.Lock()
delete(registry.sharedObjectsInPreparation, peaName)
registry.muSharedObjects.Unlock()
}
func (registry *DefaultSharedPeaRegistry) addInstanceSharedObjectsType(peaName string, typ goo.Type) {
registry.muSharedObjects.Lock()
registry.sharedObjectsType[peaName] = typ
registry.muSharedObjects.Unlock()
}