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typename.go
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typename.go
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package statefun
import (
"errors"
"fmt"
"github.com/apache/flink-statefun/statefun-sdk-go/v3/pkg/statefun/internal/protocol"
"strings"
)
var (
boolTypeName = TypeNameFrom("io.statefun.types/bool")
int32TypeName = TypeNameFrom("io.statefun.types/int")
int64TypeName = TypeNameFrom("io.statefun.types/long")
float32TypeName = TypeNameFrom("io.statefun.types/float")
float64TypeName = TypeNameFrom("io.statefun.types/double")
stringTypeName = TypeNameFrom("io.statefun.types/string")
)
// A TypeName is used to uniquely identify objects within
// a Stateful Functions application, including functions,
// egresses, and types. TypeName's serve as an integral
// part of identifying these objects for message delivery
// as well as message data serialization and deserialization.
type TypeName interface {
fmt.Stringer
GetNamespace() string
GetType() string
}
type typeName struct {
namespace string
tpe string
typenameString string
}
func (t typeName) String() string {
return t.typenameString
}
func (t typeName) GetNamespace() string {
return t.namespace
}
func (t typeName) GetType() string {
return t.tpe
}
// TypeNameFrom creates a TypeName from a canonical string
// in the format `<namespace>/<type>`. This Function
// assumes correctly formatted strings and will panic
// on error. For runtime error handling please
// see ParseTypeName.
func TypeNameFrom(typename string) TypeName {
result, err := ParseTypeName(typename)
if err != nil {
panic(err)
}
return result
}
// ParseTypeName creates a TypeName from a canonical string
// in the format `<namespace>/<type>`.
func ParseTypeName(typename string) (TypeName, error) {
position := strings.LastIndex(typename, "/")
if position <= 0 || position == len(typename)-1 {
return nil, fmt.Errorf("%v does not conform to the <namespace>/<type> format", typename)
}
namespace := typename[:position]
name := typename[position+1:]
if namespace[len(namespace)-1] == '/' {
namespace = namespace[:len(namespace)-1]
}
return TypeNameFromParts(namespace, name)
}
func TypeNameFromParts(namespace, tpe string) (TypeName, error) {
if len(namespace) == 0 {
return nil, errors.New("namespace cannot be empty")
}
if len(tpe) == 0 {
return nil, errors.New("type cannot be empty")
}
return typeName{
namespace: namespace,
tpe: tpe,
typenameString: fmt.Sprintf("%s/%s", namespace, tpe),
}, nil
}
// An Address is the unique identity of an individual StatefulFunction,
// containing the function's FunctionType and a unique identifier
// within the type. The function's type denotes the type (or class) of function
// to invoke, while the unique identifier addresses the invocation to a specific
// function instance.
type Address struct {
FunctionType TypeName
Id string
}
func (a Address) String() string {
return fmt.Sprintf("Address(%s, %s, %s)", a.FunctionType.GetNamespace(), a.FunctionType.GetType(), a.Id)
}
func addressFromInternal(a *protocol.Address) Address {
name, _ := TypeNameFromParts(a.Namespace, a.Type)
return Address{
FunctionType: name,
Id: a.Id,
}
}