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interface.go
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interface.go
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package protobuf
import (
"encoding"
)
var generators = newInterfaceRegistry()
// InterfaceMarshaler is used to differentiate implementations of an
// interface when encoding/decoding
type InterfaceMarshaler interface {
encoding.BinaryMarshaler
MarshalID() [8]byte
}
// InterfaceGeneratorFunc generates an instance of the implementation
// of an interface
type InterfaceGeneratorFunc func() interface{}
// GeneratorID is the key used to map the generator functions
type GeneratorID [8]byte
type generatorRegistry struct {
generators map[GeneratorID]InterfaceGeneratorFunc
}
func newInterfaceRegistry() *generatorRegistry {
return &generatorRegistry{
generators: make(map[GeneratorID]InterfaceGeneratorFunc),
}
}
// register gets the type tag and map it to the generator function
func (ir *generatorRegistry) register(g InterfaceGeneratorFunc) {
val, ok := g().(InterfaceMarshaler)
if !ok {
panic("Implementation of the interface must fulfilled InterfaceMarshaler")
}
key := val.MarshalID()
ir.generators[key] = g
}
// get returns the generator associated with the tag
func (ir *generatorRegistry) get(key GeneratorID) InterfaceGeneratorFunc {
g, _ := ir.generators[key]
return g
}
// RegisterInterface registers the generator to be used to decode
// the type generated by the function
func RegisterInterface(f InterfaceGeneratorFunc) {
generators.register(f)
}