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executor.go
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executor.go
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// Copyright 2019-present Open Networking Foundation.
//
// Licensed 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 rsm
// OperationID is an operation identifier
type OperationID string
// Executor executes primitive operations
type Executor interface {
// RegisterUnaryOperation registers a unary primitive operation
RegisterUnaryOperation(id OperationID, callback func([]byte, Session) ([]byte, error))
// RegisterStreamOperation registers a new primitive operation
RegisterStreamOperation(id OperationID, callback func([]byte, Session, Stream) (StreamCloser, error))
// GetOperation returns an operation by name
GetOperation(id OperationID) Operation
}
// Operation is the base interface for primitive operations
type Operation interface{}
// UnaryOperation is a primitive operation that returns a result
type UnaryOperation interface {
// Execute executes the operation
Execute(bytes []byte, session Session) ([]byte, error)
}
// StreamingOperation is a primitive operation that returns a stream
type StreamingOperation interface {
// Execute executes the operation
Execute(bytes []byte, session Session, stream Stream) (StreamCloser, error)
}
// newExecutor returns a new executor
func newExecutor() Executor {
return &executor{
operations: make(map[OperationID]Operation),
}
}
// executor is an implementation of the Executor interface
type executor struct {
Executor
operations map[OperationID]Operation
}
func (e *executor) RegisterUnaryOperation(id OperationID, callback func([]byte, Session) ([]byte, error)) {
e.operations[id] = &unaryOperation{
f: callback,
}
}
func (e *executor) RegisterStreamOperation(id OperationID, callback func([]byte, Session, Stream) (StreamCloser, error)) {
e.operations[id] = &streamingOperation{
f: callback,
}
}
func (e *executor) GetOperation(id OperationID) Operation {
return e.operations[id]
}
// unaryOperation is an implementation of the UnaryOperation interface
type unaryOperation struct {
f func([]byte, Session) ([]byte, error)
}
func (o *unaryOperation) Execute(bytes []byte, session Session) ([]byte, error) {
return o.f(bytes, session)
}
// streamingOperation is an implementation of the StreamingOperation interface
type streamingOperation struct {
f func([]byte, Session, Stream) (StreamCloser, error)
}
func (o *streamingOperation) Execute(bytes []byte, session Session, stream Stream) (StreamCloser, error) {
return o.f(bytes, session, stream)
}