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factory.go
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factory.go
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package peas
import (
"errors"
"github.com/procyon-projects/goo"
"reflect"
"sync"
)
type PeaFactory interface {
GetPea(name string) (interface{}, error)
GetPeaByNameAndType(name string, typ goo.Type) (interface{}, error)
GetPeaByNameAndArgs(name string, args ...interface{}) (interface{}, error)
GetPeaByType(typ goo.Type) (interface{}, error)
ContainsPea(name string) bool
}
type DefaultPeaFactory struct {
SharedPeaRegistry
PeaDefinitionRegistry
peaProcessors *PeaProcessors
readableTypes map[string]goo.Type
excludedTypes map[string]goo.Type
muScopes *sync.RWMutex
}
func NewDefaultPeaFactory() DefaultPeaFactory {
return DefaultPeaFactory{
SharedPeaRegistry: NewDefaultSharedPeaRegistry(),
PeaDefinitionRegistry: NewDefaultPeaDefinitionRegistry(),
peaProcessors: NewPeaProcessors(),
readableTypes: make(map[string]goo.Type, 0),
excludedTypes: make(map[string]goo.Type, 0),
muScopes: &sync.RWMutex{},
}
}
func (factory DefaultPeaFactory) GetPea(name string) (interface{}, error) {
return factory.getPeaWith(name, nil)
}
func (factory DefaultPeaFactory) GetPeaByNameAndType(name string, typ goo.Type) (interface{}, error) {
return factory.getPeaWith(name, typ)
}
func (factory DefaultPeaFactory) GetPeaByNameAndArgs(name string, args ...interface{}) (interface{}, error) {
return factory.getPeaWith(name, nil, args...)
}
func (factory DefaultPeaFactory) GetPeaByType(typ goo.Type) (interface{}, error) {
return factory.getPeaWith("", typ)
}
func (factory DefaultPeaFactory) ContainsPea(name string) bool {
return factory.ContainsSharedPea(name)
}
func (factory DefaultPeaFactory) getPeaWith(name string, requiredType goo.Type, args ...interface{}) (interface{}, error) {
if name == "" && requiredType == nil {
return nil, errors.New("one of the pea name or type must not be nil at least")
}
if name == "" {
candidatePeaNames := factory.GetPeaNamesByType(requiredType)
candidatePeaCount := len(candidatePeaNames)
if candidatePeaCount > 1 {
return nil, errors.New("there is more than one candidate pea definition for the required type, it cannot be distinguished : " + requiredType.GetPackageFullName())
} else if candidatePeaCount == 0 {
return nil, errors.New("pea definition couldn't be found for the required type : " + requiredType.GetPackageFullName())
}
name = candidatePeaNames[0]
}
sharedPea := factory.GetSharedPea(name)
if sharedPea != nil && args == nil {
if requiredType != nil {
peaDefinition := factory.GetPeaDefinition(name)
var peaType goo.Type
if peaDefinition == nil {
peaType = goo.GetType(sharedPea)
} else {
peaType = peaDefinition.GetPeaType()
}
if factory.matches(peaType, requiredType) {
return sharedPea, nil
}
return nil, errors.New("instance's type does not match the required type")
}
return sharedPea, nil
}
peaDefinition := factory.GetPeaDefinition(name)
if peaDefinition == nil {
return nil, errors.New("pea definition couldn't be found : " + name)
}
if requiredType != nil && !factory.matches(peaDefinition.GetPeaType(), requiredType) {
return nil, errors.New("pea definition type does not match the required type")
}
if SharedScope == peaDefinition.GetScope() {
instance, err := factory.GetSharedPeaWithObjectFunc(name, func() (instance interface{}, err error) {
instance, err = factory.createPea(name, peaDefinition, args)
return
})
return instance, err
} else if PrototypeScope == peaDefinition.GetScope() {
peaType := peaDefinition.GetPeaType()
if peaType.IsFunction() {
fun := peaType.ToFunctionType()
if fun.GetFunctionReturnTypeCount() == 1 {
peaType = fun.GetFunctionReturnTypes()[0]
} else {
return nil, errors.New("pea must have only one return type")
}
}
instance, err := factory.createPeaInstance(name, peaType, args)
return instance, err
}
return nil, errors.New("instance couldn't be created")
}
func (factory DefaultPeaFactory) matches(peaType goo.Type, requiredType goo.Type) bool {
if peaType.IsFunction() {
fun := peaType.ToFunctionType()
if fun.GetFunctionReturnTypeCount() == 1 {
peaType = fun.GetFunctionReturnTypes()[0]
}
}
match := false
if peaType.Equals(requiredType) || peaType.GetGoType().ConvertibleTo(requiredType.GetGoType()) {
match = true
} else if requiredType.IsInterface() && peaType.ToStructType().Implements(requiredType.ToInterfaceType()) {
match = true
} else if requiredType.IsStruct() && peaType.ToStructType().EmbeddedStruct(requiredType.ToStructType()) {
match = true
}
return match
}
func (factory DefaultPeaFactory) createPea(name string, definition PeaDefinition, args []interface{}) (interface{}, error) {
instance, err := factory.createPeaInstance(name, definition.GetPeaType(), args)
if err == nil && definition.GetScope() == SharedScope {
err = factory.RegisterSharedPea(name, instance)
}
return instance, err
}
func (factory DefaultPeaFactory) createPeaInstance(name string, typ goo.Type, args []interface{}) (result interface{}, error error) {
var instance interface{}
if typ.IsFunction() {
constructorFunction := typ.ToFunctionType()
parameterCount := constructorFunction.GetFunctionParameterCount()
if parameterCount != 0 && args == nil {
parameterTypes := constructorFunction.GetFunctionParameterTypes()
resolvedArguments := factory.createArgumentArray(name, parameterTypes)
instance, error = CreateInstance(typ, resolvedArguments)
} else if (parameterCount == 0 && args == nil) || (args != nil && parameterCount == len(args)) {
instance, error = CreateInstance(typ, args)
} else {
error = errors.New("argument count does not match with the parameter count which constructor function has go")
}
} else {
instance, error = CreateInstance(typ, nil)
}
if error != nil {
return
}
return factory.initializePea(name, instance)
}
func (factory DefaultPeaFactory) createArgumentArray(name string, parameterTypes []goo.Type) []interface{} {
argumentArray := make([]interface{}, len(parameterTypes))
for parameterIndex, parameterType := range parameterTypes {
peas := factory.resolveDependency(parameterType)
peaObjectCount := len(peas)
if peaObjectCount == 0 {
instance := factory.getDefaultValue(parameterType)
if instance != nil {
instanceType := goo.GetType(instance)
if factory.isOnlyReadableType(instanceType) && instanceType.IsPointer() {
instance = reflect.ValueOf(instance).Elem().Interface()
} else if instanceType != nil && instanceType.IsPointer() && !parameterType.IsPointer() && !parameterType.IsInterface() {
instance = reflect.ValueOf(instance).Elem().Interface()
}
}
argumentArray[parameterIndex] = instance
} else if peaObjectCount == 1 {
instance := peas[0]
if instance != nil {
instanceType := goo.GetType(instance)
if factory.isOnlyReadableType(instanceType) && instanceType.IsPointer() {
instance = reflect.ValueOf(instance).Elem().Interface()
} else if instanceType != nil && instanceType.IsPointer() && !parameterType.IsPointer() && !parameterType.IsInterface() {
instance = reflect.ValueOf(instance).Elem().Interface()
}
}
argumentArray[parameterIndex] = instance
} else {
panic("Determining which dependency is used cannot be distinguished : " + name)
}
}
return argumentArray
}
func (factory DefaultPeaFactory) resolveDependency(parameterType goo.Type) []interface{} {
candidateProcessedMap := make(map[string]bool, 0)
candidates := make([]interface{}, 0)
if parameterType.IsStruct() || parameterType.IsInterface() {
names := factory.GetPeaNamesByType(parameterType)
for _, name := range names {
candidate, err := factory.GetPea(name)
if err == nil {
candidates = append(candidates, candidate)
candidateProcessedMap[goo.GetType(candidate).GetFullName()] = true
}
}
}
typeCandidates := factory.GetSharedPeasByType(parameterType)
for _, typeCandidate := range typeCandidates {
if _, ok := candidateProcessedMap[goo.GetType(typeCandidate).GetFullName()]; ok {
continue
}
candidates = append(candidates, typeCandidate)
}
return candidates
}
func (factory DefaultPeaFactory) getDefaultValue(parameterType goo.Type) interface{} {
if parameterType.IsInterface() || parameterType.IsArray() || parameterType.IsSlice() || parameterType.IsMap() {
return nil
} else if parameterType.IsPointer() {
return nil
} else if parameterType.IsStruct() {
return parameterType.ToStructType().NewInstance()
} else if parameterType.IsString() {
return parameterType.ToStringType().NewInstance()
} else if parameterType.IsBoolean() {
return parameterType.ToBooleanType().NewInstance()
} else if parameterType.IsNumber() {
return parameterType.ToNumberType().NewInstance()
} else if parameterType.IsFunction() {
return nil
}
panic("Default value cannot be determined, it is not supported :" + parameterType.GetFullName())
}
func (factory DefaultPeaFactory) initializePea(name string, obj interface{}) (interface{}, error) {
result := obj
var err error
result, err = factory.applyPeaProcessorsBeforeInitialization(name, result)
if err != nil {
return result, err
}
err = factory.invokePeaInitializers(name, result)
if err != nil {
return result, err
}
result, err = factory.applyPeaProcessorsAfterInitialization(name, obj)
if err != nil {
return result, err
}
return result, nil
}
func (factory DefaultPeaFactory) applyPeaProcessorsBeforeInitialization(name string, obj interface{}) (interface{}, error) {
result := obj
var err error
if factory.GetPeaProcessorsCount() > 0 {
for _, processor := range factory.GetPeaProcessors() {
result, err = processor.BeforePeaInitialization(name, result)
if err != nil {
return result, err
}
}
}
return result, nil
}
func (factory DefaultPeaFactory) invokePeaInitializers(name string, obj interface{}) error {
if initializer, ok := obj.(PeaInitializer); ok {
return initializer.InitializePea()
}
return nil
}
func (factory DefaultPeaFactory) applyPeaProcessorsAfterInitialization(name string, obj interface{}) (interface{}, error) {
result := obj
var err error
if factory.GetPeaProcessorsCount() > 0 {
for _, processor := range factory.GetPeaProcessors() {
result, err = processor.AfterPeaInitialization(name, result)
if err != nil {
return result, err
}
}
}
return result, nil
}
func (factory DefaultPeaFactory) ExcludeType(typ goo.Type) error {
if typ == nil {
return errors.New("type must not be null")
}
factory.muScopes.Lock()
factory.excludedTypes[typ.GetFullName()] = typ
factory.muScopes.Unlock()
return nil
}
func (factory DefaultPeaFactory) RegisterTypeAsOnlyReadable(typ goo.Type) error {
if typ == nil {
return errors.New("type must not be null")
}
factory.muScopes.Lock()
factory.readableTypes[typ.GetFullName()] = typ
factory.muScopes.Unlock()
return nil
}
func (factory DefaultPeaFactory) isOnlyReadableType(typ goo.Type) bool {
if typ == nil {
return false
}
defer func() {
factory.muScopes.Unlock()
}()
factory.muScopes.Lock()
for _, readableType := range factory.readableTypes {
if readableType.IsInterface() && typ.IsStruct() && typ.ToStructType().Implements(readableType.ToInterfaceType()) {
return true
} else if readableType.IsStruct() && typ.IsStruct() {
if readableType.GetGoType() == typ.GetGoType() {
return true
}
}
}
return false
}
/* Pea Processors */
func (factory DefaultPeaFactory) AddPeaProcessor(processor PeaProcessor) error {
return factory.peaProcessors.AddPeaProcessor(processor)
}
func (factory DefaultPeaFactory) GetPeaProcessors() []PeaProcessor {
return factory.peaProcessors.GetProcessors()
}
func (factory DefaultPeaFactory) GetPeaProcessorsCount() int {
return factory.peaProcessors.GetProcessorsCount()
}
func (factory DefaultPeaFactory) PreInstantiateSharedPeas() {
peaNames := factory.GetPeaDefinitionNames()
for _, peaName := range peaNames {
peaDefinition := factory.GetPeaDefinition(peaName)
if peaDefinition != nil && factory.isExcludedType(peaDefinition.GetPeaType()) {
continue
}
factory.GetPea(peaName)
}
}
func (factory DefaultPeaFactory) isExcludedType(typ goo.Type) bool {
peaType := typ
if peaType.IsFunction() {
peaType = peaType.ToFunctionType().GetFunctionReturnTypes()[0]
}
for _, excludedType := range factory.excludedTypes {
if excludedType.IsStruct() && peaType.IsStruct() && excludedType.Equals(peaType) {
return true
} else if excludedType.IsInterface() && peaType.IsStruct() && peaType.ToStructType().Implements(excludedType.ToInterfaceType()) {
return true
}
}
return false
}